./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-fpi/sqm.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-fpi/sqm.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 950fd5ff5cc9d2c5e3d846192e43f4963ef3abd0ec7056eb5d764989d48b2064 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:59:51,795 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:59:51,871 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 20:59:51,877 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:59:51,877 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:59:51,901 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:59:51,902 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:59:51,903 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:59:51,904 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:59:51,904 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:59:51,905 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:59:51,905 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:59:51,906 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:59:51,906 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:59:51,907 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:59:51,907 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:59:51,908 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:59:51,909 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:59:51,909 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:59:51,910 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:59:51,910 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:59:51,911 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:59:51,912 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:59:51,912 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 20:59:51,913 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:59:51,913 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:59:51,913 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:59:51,914 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:59:51,914 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 20:59:51,915 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:59:51,915 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 20:59:51,916 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:59:51,916 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 20:59:51,916 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:59:51,917 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:59:51,917 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:59:51,918 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:59:51,918 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:59:51,919 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:59:51,919 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 20:59:51,920 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:59:51,929 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:59:51,929 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 20:59:51,929 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:59:51,930 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:59:51,930 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_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 950fd5ff5cc9d2c5e3d846192e43f4963ef3abd0ec7056eb5d764989d48b2064 [2023-11-06 20:59:52,222 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:59:52,251 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:59:52,255 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:59:52,256 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:59:52,257 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:59:52,259 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/array-fpi/sqm.c [2023-11-06 20:59:55,568 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:59:55,789 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:59:55,790 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/sv-benchmarks/c/array-fpi/sqm.c [2023-11-06 20:59:55,797 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/data/195303cda/f30d722e6fed4f9d9db82945f029bfee/FLAGd4f6ee786 [2023-11-06 20:59:55,814 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/data/195303cda/f30d722e6fed4f9d9db82945f029bfee [2023-11-06 20:59:55,817 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:59:55,819 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:59:55,821 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:59:55,821 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:59:55,827 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:59:55,828 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:59:55" (1/1) ... [2023-11-06 20:59:55,829 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c68765e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:55, skipping insertion in model container [2023-11-06 20:59:55,829 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:59:55" (1/1) ... [2023-11-06 20:59:55,853 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:59:56,000 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_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/sv-benchmarks/c/array-fpi/sqm.c[586,599] [2023-11-06 20:59:56,022 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:59:56,034 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:59:56,048 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_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/sv-benchmarks/c/array-fpi/sqm.c[586,599] [2023-11-06 20:59:56,058 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:59:56,074 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:59:56,074 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56 WrapperNode [2023-11-06 20:59:56,075 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:59:56,076 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:59:56,076 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:59:56,077 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:59:56,085 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,093 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,115 INFO L138 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 78 [2023-11-06 20:59:56,116 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:59:56,117 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:59:56,117 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:59:56,117 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:59:56,127 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,127 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,130 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,130 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,137 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,141 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,142 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,144 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,146 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:59:56,148 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:59:56,148 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:59:56,148 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:59:56,149 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (1/1) ... [2023-11-06 20:59:56,156 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:59:56,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:56,186 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:59:56,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:59:56,226 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:59:56,226 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:59:56,226 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 20:59:56,226 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-06 20:59:56,227 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:59:56,227 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:59:56,227 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 20:59:56,321 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:59:56,323 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:59:56,519 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:59:56,580 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:59:56,580 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-06 20:59:56,583 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:59:56 BoogieIcfgContainer [2023-11-06 20:59:56,584 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:59:56,587 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:59:56,587 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:59:56,591 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:59:56,591 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:59:55" (1/3) ... [2023-11-06 20:59:56,592 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30157b0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:59:56, skipping insertion in model container [2023-11-06 20:59:56,593 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:56" (2/3) ... [2023-11-06 20:59:56,593 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30157b0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:59:56, skipping insertion in model container [2023-11-06 20:59:56,593 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:59:56" (3/3) ... [2023-11-06 20:59:56,595 INFO L112 eAbstractionObserver]: Analyzing ICFG sqm.c [2023-11-06 20:59:56,616 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:59:56,616 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 20:59:56,666 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:59:56,674 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@44e353a0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:59:56,674 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 20:59:56,679 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:56,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-06 20:59:56,684 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:56,685 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:56,685 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:56,690 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:56,690 INFO L85 PathProgramCache]: Analyzing trace with hash -735732333, now seen corresponding path program 1 times [2023-11-06 20:59:56,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:56,699 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942481663] [2023-11-06 20:59:56,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:56,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:56,849 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 20:59:56,850 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [494314564] [2023-11-06 20:59:56,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:56,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:56,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:56,854 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:56,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:59:57,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:57,025 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-06 20:59:57,034 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:57,156 INFO L322 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-11-06 20:59:57,157 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 15 [2023-11-06 20:59:57,180 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2023-11-06 20:59:57,188 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 32 treesize of output 15 [2023-11-06 20:59:57,192 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-06 20:59:57,270 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:59:57,270 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:59:57,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:57,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942481663] [2023-11-06 20:59:57,271 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 20:59:57,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494314564] [2023-11-06 20:59:57,272 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494314564] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:59:57,272 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:59:57,273 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 20:59:57,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100953969] [2023-11-06 20:59:57,277 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:59:57,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 20:59:57,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:57,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 20:59:57,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:59:57,329 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:57,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:57,465 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2023-11-06 20:59:57,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-06 20:59:57,469 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-06 20:59:57,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:57,477 INFO L225 Difference]: With dead ends: 30 [2023-11-06 20:59:57,478 INFO L226 Difference]: Without dead ends: 19 [2023-11-06 20:59:57,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:59:57,484 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 11 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:57,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:57,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-06 20:59:57,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 13. [2023-11-06 20:59:57,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:57,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 17 transitions. [2023-11-06 20:59:57,522 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 17 transitions. Word has length 7 [2023-11-06 20:59:57,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:57,523 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 17 transitions. [2023-11-06 20:59:57,523 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:57,523 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 17 transitions. [2023-11-06 20:59:57,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 20:59:57,524 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:57,524 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:57,536 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-06 20:59:57,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-06 20:59:57,736 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:57,737 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:57,737 INFO L85 PathProgramCache]: Analyzing trace with hash -1337635293, now seen corresponding path program 1 times [2023-11-06 20:59:57,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:57,738 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511872530] [2023-11-06 20:59:57,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:57,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:57,796 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 20:59:57,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [90438913] [2023-11-06 20:59:57,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:57,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:57,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:57,799 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:57,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:59:57,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:57,900 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 20:59:57,901 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:57,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:59:57,961 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:59:57,961 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:57,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511872530] [2023-11-06 20:59:57,962 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 20:59:57,963 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90438913] [2023-11-06 20:59:57,963 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [90438913] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:59:57,964 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:59:57,965 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 20:59:57,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60338571] [2023-11-06 20:59:57,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:59:57,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 20:59:57,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:57,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 20:59:57,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:59:57,968 INFO L87 Difference]: Start difference. First operand 13 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:58,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:58,039 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2023-11-06 20:59:58,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:59:58,041 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-06 20:59:58,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:58,042 INFO L225 Difference]: With dead ends: 25 [2023-11-06 20:59:58,043 INFO L226 Difference]: Without dead ends: 19 [2023-11-06 20:59:58,043 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:59:58,047 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:58,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 9 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:59:58,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-06 20:59:58,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 13. [2023-11-06 20:59:58,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:58,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-11-06 20:59:58,066 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2023-11-06 20:59:58,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:58,068 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-11-06 20:59:58,068 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:58,069 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-11-06 20:59:58,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 20:59:58,073 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:58,074 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:58,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:58,280 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:58,280 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:58,281 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:58,281 INFO L85 PathProgramCache]: Analyzing trace with hash -1611921030, now seen corresponding path program 1 times [2023-11-06 20:59:58,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:58,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026097544] [2023-11-06 20:59:58,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:58,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:58,310 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 20:59:58,310 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1283827114] [2023-11-06 20:59:58,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:58,310 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:58,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:58,312 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:58,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:59:58,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:58,385 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 20:59:58,386 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:58,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:59:58,412 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:58,436 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:59:58,436 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:58,436 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026097544] [2023-11-06 20:59:58,436 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 20:59:58,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283827114] [2023-11-06 20:59:58,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283827114] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:58,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1172793692] [2023-11-06 20:59:58,462 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:59:58,462 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:58,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:58,471 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:58,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:59,211 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:59,496 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '229#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= ~N~0 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) 0) |ULTIMATE.start_main_#t~mem13#1|) (not (= |ULTIMATE.start_main_#t~mem13#1| 1)) (= |ULTIMATE.start_main_~b~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 20:59:59,497 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:59,497 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 20:59:59,497 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2023-11-06 20:59:59,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008706111] [2023-11-06 20:59:59,498 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:59,498 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:59:59,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:59,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:59:59,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2023-11-06 20:59:59,500 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:59,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:59,600 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2023-11-06 20:59:59,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-06 20:59:59,600 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-06 20:59:59,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:59,601 INFO L225 Difference]: With dead ends: 29 [2023-11-06 20:59:59,601 INFO L226 Difference]: Without dead ends: 24 [2023-11-06 20:59:59,602 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2023-11-06 20:59:59,604 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 22 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:59,604 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 15 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:59,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-06 20:59:59,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 14. [2023-11-06 20:59:59,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:59,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2023-11-06 20:59:59,610 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8 [2023-11-06 20:59:59,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:59,610 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2023-11-06 20:59:59,610 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:59,610 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2023-11-06 20:59:59,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-06 20:59:59,611 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:59,611 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:59,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:59,817 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:59,818 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:59,818 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:59,820 INFO L85 PathProgramCache]: Analyzing trace with hash 1565286172, now seen corresponding path program 1 times [2023-11-06 20:59:59,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:59,821 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522271787] [2023-11-06 20:59:59,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:59,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:59,893 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 20:59:59,894 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [328580609] [2023-11-06 20:59:59,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:59,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:59,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:59,897 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:59,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 21:00:00,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:00:00,011 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-06 21:00:00,014 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:00:00,032 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 32 [2023-11-06 21:00:00,058 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 32 treesize of output 22 [2023-11-06 21:00:00,065 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-06 21:00:00,078 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2023-11-06 21:00:00,085 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 32 treesize of output 15 [2023-11-06 21:00:00,091 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-06 21:00:00,104 INFO L351 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 [2023-11-06 21:00:00,131 INFO L351 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 16 treesize of output 11 [2023-11-06 21:00:00,172 INFO L351 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 23 treesize of output 11 [2023-11-06 21:00:00,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:00:00,217 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:00:00,536 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:00:00,536 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:00:00,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522271787] [2023-11-06 21:00:00,537 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 21:00:00,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328580609] [2023-11-06 21:00:00,537 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328580609] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:00:00,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [883670144] [2023-11-06 21:00:00,540 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 21:00:00,542 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:00:00,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:00:00,543 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:00:00,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:00:01,243 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:00:01,532 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '361#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) |ULTIMATE.start_main_~a~0#1.offset|) |ULTIMATE.start_main_#t~mem13#1|) (not (= |ULTIMATE.start_main_#t~mem13#1| 1)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 21:00:01,532 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:00:01,532 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 21:00:01,532 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2023-11-06 21:00:01,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145814468] [2023-11-06 21:00:01,533 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 21:00:01,533 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-06 21:00:01,533 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:00:01,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-06 21:00:01,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=251, Unknown=3, NotChecked=0, Total=306 [2023-11-06 21:00:01,535 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:01,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:00:01,906 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2023-11-06 21:00:01,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-06 21:00:01,907 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-06 21:00:01,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:00:01,908 INFO L225 Difference]: With dead ends: 37 [2023-11-06 21:00:01,908 INFO L226 Difference]: Without dead ends: 35 [2023-11-06 21:00:01,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=122, Invalid=475, Unknown=3, NotChecked=0, Total=600 [2023-11-06 21:00:01,910 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 48 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:00:01,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 20 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:00:01,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-06 21:00:01,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 16. [2023-11-06 21:00:01,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:01,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 21 transitions. [2023-11-06 21:00:01,918 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 21 transitions. Word has length 9 [2023-11-06 21:00:01,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:00:01,918 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 21 transitions. [2023-11-06 21:00:01,918 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:01,919 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 21 transitions. [2023-11-06 21:00:01,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-06 21:00:01,919 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:00:01,919 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:00:01,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 21:00:02,130 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:02,131 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:00:02,131 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:00:02,131 INFO L85 PathProgramCache]: Analyzing trace with hash -978676906, now seen corresponding path program 1 times [2023-11-06 21:00:02,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:00:02,131 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358007469] [2023-11-06 21:00:02,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:00:02,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:00:02,163 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 21:00:02,163 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1881058544] [2023-11-06 21:00:02,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:00:02,164 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:02,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:00:02,165 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:00:02,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 21:00:02,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:00:02,234 INFO L262 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-06 21:00:02,235 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:00:02,279 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:00:02,280 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:00:02,280 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:00:02,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358007469] [2023-11-06 21:00:02,280 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 21:00:02,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1881058544] [2023-11-06 21:00:02,281 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1881058544] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:00:02,281 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:00:02,281 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-06 21:00:02,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339044426] [2023-11-06 21:00:02,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:00:02,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 21:00:02,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:00:02,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 21:00:02,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-11-06 21:00:02,284 INFO L87 Difference]: Start difference. First operand 16 states and 21 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:02,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:00:02,361 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2023-11-06 21:00:02,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 21:00:02,362 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-06 21:00:02,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:00:02,362 INFO L225 Difference]: With dead ends: 30 [2023-11-06 21:00:02,363 INFO L226 Difference]: Without dead ends: 20 [2023-11-06 21:00:02,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2023-11-06 21:00:02,364 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:00:02,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 12 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:00:02,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-06 21:00:02,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 15. [2023-11-06 21:00:02,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:02,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2023-11-06 21:00:02,371 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 10 [2023-11-06 21:00:02,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:00:02,372 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2023-11-06 21:00:02,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:02,372 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2023-11-06 21:00:02,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-06 21:00:02,373 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:00:02,373 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:00:02,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 21:00:02,578 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:02,578 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:00:02,579 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:00:02,579 INFO L85 PathProgramCache]: Analyzing trace with hash 848835292, now seen corresponding path program 2 times [2023-11-06 21:00:02,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:00:02,579 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464480998] [2023-11-06 21:00:02,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:00:02,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:00:02,635 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 21:00:02,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1462638543] [2023-11-06 21:00:02,635 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:00:02,635 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:02,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:00:02,644 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:00:02,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 21:00:02,818 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 21:00:02,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:00:02,820 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-06 21:00:02,822 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:00:02,871 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:00:02,872 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:00:02,925 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:00:02,925 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:00:02,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464480998] [2023-11-06 21:00:02,925 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 21:00:02,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462638543] [2023-11-06 21:00:02,926 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462638543] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:00:02,926 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [39937592] [2023-11-06 21:00:02,928 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 21:00:02,929 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:00:02,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:00:02,929 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:00:02,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:00:04,792 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:00:05,138 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '631#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (exists ((|v_ULTIMATE.start_main_~i~0#1_91| Int)) (and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~N~0 |v_ULTIMATE.start_main_~i~0#1_91|) (= |ULTIMATE.start_main_~b~0#1.offset| 0))) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) |ULTIMATE.start_main_~a~0#1.offset|) |ULTIMATE.start_main_#t~mem13#1|) (not (= |ULTIMATE.start_main_#t~mem13#1| 1)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 21:00:05,138 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:00:05,138 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 21:00:05,138 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2023-11-06 21:00:05,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817954514] [2023-11-06 21:00:05,139 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 21:00:05,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-06 21:00:05,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:00:05,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-06 21:00:05,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2023-11-06 21:00:05,140 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:05,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:00:05,334 INFO L93 Difference]: Finished difference Result 55 states and 66 transitions. [2023-11-06 21:00:05,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-06 21:00:05,335 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-06 21:00:05,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:00:05,336 INFO L225 Difference]: With dead ends: 55 [2023-11-06 21:00:05,336 INFO L226 Difference]: Without dead ends: 44 [2023-11-06 21:00:05,337 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2023-11-06 21:00:05,338 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 34 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:00:05,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 27 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:00:05,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-06 21:00:05,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 27. [2023-11-06 21:00:05,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 26 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:05,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2023-11-06 21:00:05,353 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 11 [2023-11-06 21:00:05,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:00:05,353 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2023-11-06 21:00:05,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:05,355 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2023-11-06 21:00:05,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-06 21:00:05,356 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:00:05,356 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:00:05,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-06 21:00:05,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:05,563 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:00:05,563 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:00:05,563 INFO L85 PathProgramCache]: Analyzing trace with hash 985561389, now seen corresponding path program 1 times [2023-11-06 21:00:05,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:00:05,564 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981474054] [2023-11-06 21:00:05,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:00:05,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:00:05,611 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 21:00:05,612 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1307018639] [2023-11-06 21:00:05,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:00:05,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:05,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:00:05,619 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:00:05,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-06 21:00:05,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:00:05,742 INFO L262 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 40 conjunts are in the unsatisfiable core [2023-11-06 21:00:05,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:00:05,770 INFO L322 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-11-06 21:00:05,771 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2023-11-06 21:00:05,785 INFO L351 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 [2023-11-06 21:00:05,824 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2023-11-06 21:00:05,908 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-11-06 21:00:06,132 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:00:06,133 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:00:06,721 WARN L839 $PredicateComparison]: unable to prove that (let ((.cse3 (mod |c_ULTIMATE.start_main_~i~0#1| 4294967296))) (let ((.cse0 (select |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base|)) (.cse2 (* .cse3 8))) (and (or (forall ((v_ArrVal_166 (Array Int Int))) (or (= 2 (+ (select v_ArrVal_166 |c_ULTIMATE.start_main_~b~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base| v_ArrVal_166) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|))) (not (= v_ArrVal_166 (let ((.cse1 (+ .cse2 (- 34359738368) |c_ULTIMATE.start_main_~b~0#1.offset|))) (store .cse0 .cse1 (select v_ArrVal_166 .cse1))))))) (< .cse3 2147483648)) (or (< 2147483647 .cse3) (forall ((v_ArrVal_166 (Array Int Int))) (or (= 2 (+ (select v_ArrVal_166 |c_ULTIMATE.start_main_~b~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base| v_ArrVal_166) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|))) (not (= v_ArrVal_166 (let ((.cse4 (+ .cse2 |c_ULTIMATE.start_main_~b~0#1.offset|))) (store .cse0 .cse4 (select v_ArrVal_166 .cse4))))))))))) is different from false [2023-11-06 21:00:06,738 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2023-11-06 21:00:06,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:00:06,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981474054] [2023-11-06 21:00:06,738 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 21:00:06,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307018639] [2023-11-06 21:00:06,739 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307018639] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:00:06,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1364936515] [2023-11-06 21:00:06,741 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:00:06,742 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:00:06,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:00:06,742 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:00:06,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:00:07,369 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:00:07,757 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '854#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |ULTIMATE.start_main_~b~0#1.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-06 21:00:07,757 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:00:07,757 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 21:00:07,757 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 17 [2023-11-06 21:00:07,757 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922980219] [2023-11-06 21:00:07,758 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 21:00:07,758 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-06 21:00:07,758 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:00:07,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-06 21:00:07,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=430, Unknown=1, NotChecked=42, Total=552 [2023-11-06 21:00:07,760 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:08,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:00:08,223 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2023-11-06 21:00:08,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-06 21:00:08,224 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-06 21:00:08,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:00:08,224 INFO L225 Difference]: With dead ends: 34 [2023-11-06 21:00:08,225 INFO L226 Difference]: Without dead ends: 25 [2023-11-06 21:00:08,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=143, Invalid=616, Unknown=1, NotChecked=52, Total=812 [2023-11-06 21:00:08,226 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 12 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:00:08,227 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 26 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 86 Invalid, 0 Unknown, 17 Unchecked, 0.2s Time] [2023-11-06 21:00:08,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-06 21:00:08,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-11-06 21:00:08,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:08,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2023-11-06 21:00:08,235 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 12 [2023-11-06 21:00:08,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:00:08,235 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2023-11-06 21:00:08,236 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:08,236 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2023-11-06 21:00:08,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-06 21:00:08,237 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:00:08,237 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:00:08,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-06 21:00:08,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-06 21:00:08,445 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:00:08,445 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:00:08,445 INFO L85 PathProgramCache]: Analyzing trace with hash -76388954, now seen corresponding path program 2 times [2023-11-06 21:00:08,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:00:08,446 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5626647] [2023-11-06 21:00:08,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:00:08,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:00:08,500 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 21:00:08,505 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1535116811] [2023-11-06 21:00:08,505 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:00:08,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:08,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:00:08,506 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:00:08,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-06 21:00:08,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 21:00:08,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:00:08,591 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-06 21:00:08,593 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:00:08,635 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 21:00:08,635 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:00:08,680 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 21:00:08,680 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:00:08,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5626647] [2023-11-06 21:00:08,681 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 21:00:08,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535116811] [2023-11-06 21:00:08,681 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535116811] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:00:08,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1137532259] [2023-11-06 21:00:08,684 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:00:08,684 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:00:08,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:00:08,685 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:00:08,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:00:10,199 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:00:10,510 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1046#(and (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-06 21:00:10,510 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:00:10,510 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 21:00:10,510 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-11-06 21:00:10,511 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902860873] [2023-11-06 21:00:10,511 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 21:00:10,511 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-06 21:00:10,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:00:10,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-06 21:00:10,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2023-11-06 21:00:10,513 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:10,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:00:10,658 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2023-11-06 21:00:10,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-06 21:00:10,658 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-06 21:00:10,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:00:10,659 INFO L225 Difference]: With dead ends: 37 [2023-11-06 21:00:10,659 INFO L226 Difference]: Without dead ends: 30 [2023-11-06 21:00:10,660 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2023-11-06 21:00:10,661 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 35 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:00:10,661 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 15 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:00:10,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-11-06 21:00:10,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 20. [2023-11-06 21:00:10,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:10,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2023-11-06 21:00:10,669 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 13 [2023-11-06 21:00:10,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:00:10,670 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2023-11-06 21:00:10,670 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:10,670 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2023-11-06 21:00:10,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-06 21:00:10,671 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:00:10,671 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:00:10,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-06 21:00:10,877 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-06 21:00:10,877 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:00:10,878 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:00:10,878 INFO L85 PathProgramCache]: Analyzing trace with hash 1553743804, now seen corresponding path program 3 times [2023-11-06 21:00:10,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:00:10,878 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020188023] [2023-11-06 21:00:10,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:00:10,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:00:10,909 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 21:00:10,917 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [816392817] [2023-11-06 21:00:10,917 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 21:00:10,917 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:10,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:00:10,924 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:00:10,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-06 21:00:11,375 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 21:00:11,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:00:11,378 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 43 conjunts are in the unsatisfiable core [2023-11-06 21:00:11,381 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:00:11,397 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 32 [2023-11-06 21:00:11,402 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 32 treesize of output 22 [2023-11-06 21:00:11,407 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-06 21:00:11,415 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2023-11-06 21:00:11,421 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 32 treesize of output 15 [2023-11-06 21:00:11,426 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-06 21:00:11,434 INFO L351 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 [2023-11-06 21:00:11,458 INFO L351 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 16 treesize of output 11 [2023-11-06 21:00:11,479 INFO L351 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 16 treesize of output 11 [2023-11-06 21:00:11,499 INFO L351 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 16 treesize of output 11 [2023-11-06 21:00:11,536 INFO L351 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 23 treesize of output 11 [2023-11-06 21:00:11,561 INFO L351 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 23 treesize of output 11 [2023-11-06 21:00:11,584 INFO L351 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 23 treesize of output 11 [2023-11-06 21:00:11,626 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:00:11,627 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:00:12,649 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 21:00:12,649 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:00:12,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020188023] [2023-11-06 21:00:12,649 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 21:00:12,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816392817] [2023-11-06 21:00:12,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816392817] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:00:12,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1794775262] [2023-11-06 21:00:12,652 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 21:00:12,652 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:00:12,653 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:00:12,653 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:00:12,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:00:14,060 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:00:14,361 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1237#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) |ULTIMATE.start_main_~a~0#1.offset|) |ULTIMATE.start_main_#t~mem13#1|) (not (= |ULTIMATE.start_main_#t~mem13#1| 1)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-06 21:00:14,361 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:00:14,362 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 21:00:14,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 18 [2023-11-06 21:00:14,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583214283] [2023-11-06 21:00:14,362 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 21:00:14,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-06 21:00:14,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:00:14,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-06 21:00:14,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2023-11-06 21:00:14,364 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:16,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:00:16,100 INFO L93 Difference]: Finished difference Result 67 states and 78 transitions. [2023-11-06 21:00:16,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-06 21:00:16,100 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-06 21:00:16,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:00:16,102 INFO L225 Difference]: With dead ends: 67 [2023-11-06 21:00:16,102 INFO L226 Difference]: Without dead ends: 65 [2023-11-06 21:00:16,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=276, Invalid=1056, Unknown=0, NotChecked=0, Total=1332 [2023-11-06 21:00:16,107 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 118 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-06 21:00:16,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 59 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-06 21:00:16,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-06 21:00:16,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 24. [2023-11-06 21:00:16,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:16,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2023-11-06 21:00:16,125 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 13 [2023-11-06 21:00:16,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:00:16,125 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2023-11-06 21:00:16,125 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:16,126 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2023-11-06 21:00:16,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-06 21:00:16,126 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:00:16,126 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:00:16,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-06 21:00:16,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-06 21:00:16,328 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:00:16,329 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:00:16,329 INFO L85 PathProgramCache]: Analyzing trace with hash 1419825270, now seen corresponding path program 3 times [2023-11-06 21:00:16,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:00:16,329 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026983998] [2023-11-06 21:00:16,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:00:16,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:00:16,366 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 21:00:16,366 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1367215553] [2023-11-06 21:00:16,366 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 21:00:16,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:16,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:00:16,369 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:00:16,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-06 21:00:16,696 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 21:00:16,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:00:16,699 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 45 conjunts are in the unsatisfiable core [2023-11-06 21:00:16,702 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:00:16,715 INFO L351 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 [2023-11-06 21:00:16,722 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2023-11-06 21:00:16,755 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2023-11-06 21:00:16,791 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2023-11-06 21:00:16,852 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-11-06 21:00:16,902 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 47 [2023-11-06 21:00:17,151 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:00:17,152 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:00:18,205 WARN L839 $PredicateComparison]: unable to prove that (let ((.cse3 (mod |c_ULTIMATE.start_main_~i~0#1| 4294967296))) (let ((.cse0 (select |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base|)) (.cse2 (* .cse3 8))) (and (or (forall ((v_ArrVal_289 (Array Int Int))) (or (= (+ (select v_ArrVal_289 |c_ULTIMATE.start_main_~b~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base| v_ArrVal_289) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|)) 2) (not (= v_ArrVal_289 (let ((.cse1 (+ .cse2 (- 34359738368) |c_ULTIMATE.start_main_~b~0#1.offset|))) (store .cse0 .cse1 (select v_ArrVal_289 .cse1))))))) (< .cse3 2147483648)) (or (< 2147483647 .cse3) (forall ((v_ArrVal_289 (Array Int Int))) (or (= (+ (select v_ArrVal_289 |c_ULTIMATE.start_main_~b~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base| v_ArrVal_289) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|)) 2) (not (= v_ArrVal_289 (let ((.cse4 (+ .cse2 |c_ULTIMATE.start_main_~b~0#1.offset|))) (store .cse0 .cse4 (select v_ArrVal_289 .cse4))))))))))) is different from false [2023-11-06 21:00:18,437 WARN L839 $PredicateComparison]: unable to prove that (let ((.cse10 (mod |c_ULTIMATE.start_main_~i~0#1| 4294967296))) (let ((.cse0 (mod (+ |c_ULTIMATE.start_main_~i~0#1| 1) 4294967296)) (.cse9 (* .cse10 8))) (let ((.cse2 (+ .cse9 (- 34359738368) |c_ULTIMATE.start_main_~b~0#1.offset|)) (.cse4 (< .cse10 2147483648)) (.cse5 (< 2147483647 .cse10)) (.cse1 (select |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base|)) (.cse6 (+ .cse9 |c_ULTIMATE.start_main_~b~0#1.offset|)) (.cse7 (* .cse0 8))) (and (or (< 2147483647 .cse0) (let ((.cse3 (+ .cse7 |c_ULTIMATE.start_main_~b~0#1.offset|))) (and (or (forall ((v_ArrVal_289 (Array Int Int))) (or (not (= v_ArrVal_289 (store (store .cse1 .cse2 (select v_ArrVal_289 .cse2)) .cse3 (select v_ArrVal_289 .cse3)))) (= (+ (select v_ArrVal_289 |c_ULTIMATE.start_main_~b~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base| v_ArrVal_289) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|)) 2))) .cse4) (or .cse5 (forall ((v_ArrVal_289 (Array Int Int))) (or (not (= v_ArrVal_289 (store (store .cse1 .cse6 (select v_ArrVal_289 .cse6)) .cse3 (select v_ArrVal_289 .cse3)))) (= (+ (select v_ArrVal_289 |c_ULTIMATE.start_main_~b~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base| v_ArrVal_289) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|)) 2))))))) (or (< .cse0 2147483648) (let ((.cse8 (+ .cse7 (- 34359738368) |c_ULTIMATE.start_main_~b~0#1.offset|))) (and (or (forall ((v_ArrVal_289 (Array Int Int))) (or (not (= (store (store .cse1 .cse2 (select v_ArrVal_289 .cse2)) .cse8 (select v_ArrVal_289 .cse8)) v_ArrVal_289)) (= (+ (select v_ArrVal_289 |c_ULTIMATE.start_main_~b~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base| v_ArrVal_289) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|)) 2))) .cse4) (or .cse5 (forall ((v_ArrVal_289 (Array Int Int))) (or (= (+ (select v_ArrVal_289 |c_ULTIMATE.start_main_~b~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~b~0#1.base| v_ArrVal_289) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|)) 2) (not (= v_ArrVal_289 (store (store .cse1 .cse6 (select v_ArrVal_289 .cse6)) .cse8 (select v_ArrVal_289 .cse8)))))))))))))) is different from false [2023-11-06 21:00:18,467 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 3 not checked. [2023-11-06 21:00:18,468 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:00:18,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026983998] [2023-11-06 21:00:18,468 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 21:00:18,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367215553] [2023-11-06 21:00:18,468 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367215553] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:00:18,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [448035526] [2023-11-06 21:00:18,470 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:00:18,470 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:00:18,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:00:18,471 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:00:18,471 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:00:20,846 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:00:21,395 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1502#(and (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-06 21:00:21,395 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:00:21,395 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 21:00:21,395 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2023-11-06 21:00:21,395 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854394839] [2023-11-06 21:00:21,396 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 21:00:21,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-06 21:00:21,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:00:21,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-06 21:00:21,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=472, Unknown=2, NotChecked=90, Total=650 [2023-11-06 21:00:21,398 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:23,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:00:23,057 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2023-11-06 21:00:23,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-06 21:00:23,057 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-06 21:00:23,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:00:23,058 INFO L225 Difference]: With dead ends: 47 [2023-11-06 21:00:23,058 INFO L226 Difference]: Without dead ends: 45 [2023-11-06 21:00:23,059 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=214, Invalid=914, Unknown=2, NotChecked=130, Total=1260 [2023-11-06 21:00:23,060 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 82 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-06 21:00:23,060 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 53 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 139 Invalid, 0 Unknown, 70 Unchecked, 0.5s Time] [2023-11-06 21:00:23,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-11-06 21:00:23,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 27. [2023-11-06 21:00:23,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.3461538461538463) internal successors, (35), 26 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:23,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2023-11-06 21:00:23,074 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 14 [2023-11-06 21:00:23,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:00:23,074 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2023-11-06 21:00:23,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:23,074 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2023-11-06 21:00:23,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-06 21:00:23,075 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:00:23,075 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:00:23,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-06 21:00:23,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-06 21:00:23,282 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:00:23,282 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:00:23,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1207205201, now seen corresponding path program 4 times [2023-11-06 21:00:23,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:00:23,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271400377] [2023-11-06 21:00:23,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:00:23,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:00:23,306 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 21:00:23,306 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [927462838] [2023-11-06 21:00:23,306 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 21:00:23,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:23,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:00:23,308 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:00:23,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-06 21:00:23,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:00:23,395 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 21:00:23,396 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:00:23,482 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 21:00:23,482 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:00:23,564 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 21:00:23,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:00:23,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271400377] [2023-11-06 21:00:23,565 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 21:00:23,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927462838] [2023-11-06 21:00:23,565 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927462838] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:00:23,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1759788587] [2023-11-06 21:00:23,567 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:00:23,567 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:00:23,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:00:23,568 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:00:23,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:00:23,964 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:00:24,263 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1741#(and (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-06 21:00:24,263 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:00:24,263 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 21:00:24,263 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2023-11-06 21:00:24,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19441501] [2023-11-06 21:00:24,263 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 21:00:24,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-06 21:00:24,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:00:24,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-06 21:00:24,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2023-11-06 21:00:24,265 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand has 12 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:24,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:00:24,547 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2023-11-06 21:00:24,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-06 21:00:24,547 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-06 21:00:24,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:00:24,547 INFO L225 Difference]: With dead ends: 56 [2023-11-06 21:00:24,548 INFO L226 Difference]: Without dead ends: 49 [2023-11-06 21:00:24,548 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 20 SyntacticMatches, 7 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2023-11-06 21:00:24,549 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 39 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:00:24,549 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 38 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:00:24,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-11-06 21:00:24,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 27. [2023-11-06 21:00:24,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 26 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:24,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2023-11-06 21:00:24,564 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 15 [2023-11-06 21:00:24,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:00:24,565 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2023-11-06 21:00:24,565 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:00:24,565 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2023-11-06 21:00:24,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-06 21:00:24,566 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:00:24,566 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:00:24,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-06 21:00:24,772 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-06 21:00:24,773 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:00:24,773 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:00:24,773 INFO L85 PathProgramCache]: Analyzing trace with hash 724259981, now seen corresponding path program 5 times [2023-11-06 21:00:24,773 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:00:24,773 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417794611] [2023-11-06 21:00:24,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:00:24,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:00:24,792 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 21:00:24,792 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [106609699] [2023-11-06 21:00:24,792 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:00:24,793 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:00:24,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:00:24,794 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:00:24,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bab0f2a-120b-4a06-8cdc-fde2f7a528a2/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-06 21:00:25,375 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 21:00:25,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:00:25,379 INFO L262 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 65 conjunts are in the unsatisfiable core [2023-11-06 21:00:25,383 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:00:25,403 INFO L351 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 [2023-11-06 21:00:25,409 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2023-11-06 21:00:25,470 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-11-06 21:00:25,529 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 31 [2023-11-06 21:00:25,581 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 31 [2023-11-06 21:00:25,716 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 38 [2023-11-06 21:00:25,782 INFO L322 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-11-06 21:00:25,782 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 44 treesize of output 41 [2023-11-06 21:00:25,882 INFO L322 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-06 21:00:25,882 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 88 treesize of output 77 [2023-11-06 21:00:25,914 INFO L322 Elim1Store]: treesize reduction 54, result has 1.8 percent of original size [2023-11-06 21:00:25,915 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 58 treesize of output 109 [2023-11-06 21:00:25,995 INFO L322 Elim1Store]: treesize reduction 52, result has 37.3 percent of original size [2023-11-06 21:00:25,996 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 81 treesize of output 50 [2023-11-06 21:00:26,393 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:00:26,393 INFO L327 TraceCheckSpWp]: Computing backward predicates...