./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursified_loop-simple/recursified_nested_2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursified_loop-simple/recursified_nested_2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1a590e2514668f126114e4312bb6236a04cce9502b393533b5b4bfd230be904b --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:37:09,775 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:37:09,881 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:37:09,892 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:37:09,893 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:37:09,937 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:37:09,938 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:37:09,939 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:37:09,940 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:37:09,945 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:37:09,946 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:37:09,947 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:37:09,948 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:37:09,949 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:37:09,950 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:37:09,950 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:37:09,951 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:37:09,952 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:37:09,952 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:37:09,953 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:37:09,953 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:37:09,954 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:37:09,955 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:37:09,956 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:37:09,957 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:37:09,957 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:37:09,958 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:37:09,958 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:37:09,959 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:37:09,959 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:37:09,961 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:37:09,961 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:37:09,961 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:37:09,962 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:37:09,962 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:37:09,963 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:37:09,963 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:37:09,963 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:37:09,964 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:37:09,964 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:37:09,964 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:37:09,965 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:37:09,965 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:37:09,966 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:37:09,966 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:37:09,967 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:37:09,967 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:37:09,967 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_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1a590e2514668f126114e4312bb6236a04cce9502b393533b5b4bfd230be904b [2023-11-23 20:37:10,308 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:37:10,340 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:37:10,342 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:37:10,343 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:37:10,344 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:37:10,345 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/recursified_loop-simple/recursified_nested_2.c [2023-11-23 20:37:13,531 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:37:13,774 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:37:13,774 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/sv-benchmarks/c/recursified_loop-simple/recursified_nested_2.c [2023-11-23 20:37:13,781 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/data/6286bad0b/c65a5b0ffef04f5b83731b7615daf317/FLAG9710f1157 [2023-11-23 20:37:13,796 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/data/6286bad0b/c65a5b0ffef04f5b83731b7615daf317 [2023-11-23 20:37:13,799 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:37:13,801 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:37:13,802 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:37:13,803 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:37:13,808 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:37:13,809 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:37:13" (1/1) ... [2023-11-23 20:37:13,810 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21113630 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:13, skipping insertion in model container [2023-11-23 20:37:13,810 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:37:13" (1/1) ... [2023-11-23 20:37:13,831 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:37:14,038 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_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/sv-benchmarks/c/recursified_loop-simple/recursified_nested_2.c[1611,1624] [2023-11-23 20:37:14,044 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:37:14,057 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:37:14,076 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_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/sv-benchmarks/c/recursified_loop-simple/recursified_nested_2.c[1611,1624] [2023-11-23 20:37:14,077 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:37:14,092 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:37:14,093 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14 WrapperNode [2023-11-23 20:37:14,093 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:37:14,094 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:37:14,095 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:37:14,095 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:37:14,102 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,111 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,130 INFO L138 Inliner]: procedures = 13, calls = 29, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 38 [2023-11-23 20:37:14,130 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:37:14,132 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:37:14,132 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:37:14,132 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:37:14,142 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,142 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,153 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,153 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,158 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,160 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,161 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,162 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,164 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:37:14,169 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:37:14,169 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:37:14,169 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:37:14,170 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (1/1) ... [2023-11-23 20:37:14,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:37:14,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:14,203 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:37:14,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:37:14,252 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:37:14,252 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:37:14,252 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 20:37:14,253 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 20:37:14,254 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_20_to_21_0 [2023-11-23 20:37:14,255 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_20_to_21_0 [2023-11-23 20:37:14,255 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:37:14,256 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:37:14,256 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 20:37:14,256 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_21_to_21_0 [2023-11-23 20:37:14,256 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_21_to_21_0 [2023-11-23 20:37:14,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 20:37:14,347 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:37:14,349 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:37:14,533 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:37:14,598 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:37:14,598 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-23 20:37:14,600 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:37:14 BoogieIcfgContainer [2023-11-23 20:37:14,600 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:37:14,604 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:37:14,604 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:37:14,608 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:37:14,609 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:37:13" (1/3) ... [2023-11-23 20:37:14,610 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75a992e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:37:14, skipping insertion in model container [2023-11-23 20:37:14,610 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:14" (2/3) ... [2023-11-23 20:37:14,612 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75a992e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:37:14, skipping insertion in model container [2023-11-23 20:37:14,613 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:37:14" (3/3) ... [2023-11-23 20:37:14,615 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_nested_2.c [2023-11-23 20:37:14,636 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:37:14,637 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 20:37:14,687 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:37:14,695 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@3cf1b96a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:37:14,696 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 20:37:14,700 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 20:37:14,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 20:37:14,708 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:14,709 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:14,710 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:37:14,715 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:14,716 INFO L85 PathProgramCache]: Analyzing trace with hash -1634918771, now seen corresponding path program 1 times [2023-11-23 20:37:14,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:14,727 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537438948] [2023-11-23 20:37:14,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:14,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:14,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:15,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:37:15,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:15,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537438948] [2023-11-23 20:37:15,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537438948] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:15,284 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:15,284 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:37:15,286 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871436569] [2023-11-23 20:37:15,286 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:15,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:37:15,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:15,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:37:15,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:37:15,324 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 20:37:15,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:15,428 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2023-11-23 20:37:15,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:37:15,431 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2023-11-23 20:37:15,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:15,439 INFO L225 Difference]: With dead ends: 30 [2023-11-23 20:37:15,439 INFO L226 Difference]: Without dead ends: 22 [2023-11-23 20:37:15,442 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:37:15,446 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 4 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:15,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 38 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:15,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-23 20:37:15,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2023-11-23 20:37:15,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 14 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2023-11-23 20:37:15,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-11-23 20:37:15,490 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 9 [2023-11-23 20:37:15,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:15,491 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-11-23 20:37:15,491 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 20:37:15,491 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-11-23 20:37:15,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 20:37:15,493 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:15,493 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:15,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:37:15,494 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:37:15,495 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:15,495 INFO L85 PathProgramCache]: Analyzing trace with hash -268818197, now seen corresponding path program 1 times [2023-11-23 20:37:15,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:15,496 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997774439] [2023-11-23 20:37:15,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:15,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:15,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:15,794 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 20:37:15,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:15,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997774439] [2023-11-23 20:37:15,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997774439] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:15,795 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:15,796 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 20:37:15,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38563392] [2023-11-23 20:37:15,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:15,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:37:15,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:15,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:37:15,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:37:15,799 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:37:15,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:15,882 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2023-11-23 20:37:15,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:37:15,883 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2023-11-23 20:37:15,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:15,884 INFO L225 Difference]: With dead ends: 40 [2023-11-23 20:37:15,885 INFO L226 Difference]: Without dead ends: 22 [2023-11-23 20:37:15,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:37:15,887 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 4 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:15,888 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 37 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:15,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-23 20:37:15,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-23 20:37:15,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 15 states have internal predecessors, (15), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 20:37:15,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2023-11-23 20:37:15,898 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 20 [2023-11-23 20:37:15,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:15,898 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2023-11-23 20:37:15,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:37:15,900 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2023-11-23 20:37:15,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 20:37:15,902 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:15,902 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:15,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:37:15,903 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:37:15,904 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:15,905 INFO L85 PathProgramCache]: Analyzing trace with hash 659307019, now seen corresponding path program 1 times [2023-11-23 20:37:15,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:15,906 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704518314] [2023-11-23 20:37:15,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:15,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:15,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:16,373 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:37:16,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:16,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704518314] [2023-11-23 20:37:16,374 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704518314] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:16,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [811082945] [2023-11-23 20:37:16,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:16,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:16,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:16,389 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:16,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:37:16,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:16,500 INFO L262 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-23 20:37:16,511 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:16,568 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:37:16,739 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:37:16,740 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:17,307 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 20:37:17,308 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [811082945] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:37:17,308 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2075870945] [2023-11-23 20:37:17,331 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 20:37:17,331 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:17,342 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-23 20:37:17,344 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:37:17,344 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 10] total 21 [2023-11-23 20:37:17,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050351744] [2023-11-23 20:37:17,344 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:17,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-23 20:37:17,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:17,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-23 20:37:17,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2023-11-23 20:37:17,351 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 21 states, 16 states have (on average 1.875) internal successors, (30), 18 states have internal predecessors, (30), 7 states have call successors, (8), 5 states have call predecessors, (8), 7 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) [2023-11-23 20:37:17,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:17,628 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2023-11-23 20:37:17,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 20:37:17,629 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 16 states have (on average 1.875) internal successors, (30), 18 states have internal predecessors, (30), 7 states have call successors, (8), 5 states have call predecessors, (8), 7 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) Word has length 25 [2023-11-23 20:37:17,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:17,632 INFO L225 Difference]: With dead ends: 46 [2023-11-23 20:37:17,633 INFO L226 Difference]: Without dead ends: 26 [2023-11-23 20:37:17,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2023-11-23 20:37:17,637 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 12 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:17,640 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 80 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:17,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-23 20:37:17,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-23 20:37:17,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 6 states have return successors, (8), 6 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 20:37:17,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2023-11-23 20:37:17,655 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 25 [2023-11-23 20:37:17,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:17,656 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2023-11-23 20:37:17,656 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 16 states have (on average 1.875) internal successors, (30), 18 states have internal predecessors, (30), 7 states have call successors, (8), 5 states have call predecessors, (8), 7 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) [2023-11-23 20:37:17,657 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2023-11-23 20:37:17,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-23 20:37:17,659 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:17,659 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:17,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 20:37:17,886 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:17,886 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:37:17,887 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:17,887 INFO L85 PathProgramCache]: Analyzing trace with hash -1625699077, now seen corresponding path program 2 times [2023-11-23 20:37:17,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:17,887 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145004498] [2023-11-23 20:37:17,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:17,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:17,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:18,653 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 6 proven. 16 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 20:37:18,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:18,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145004498] [2023-11-23 20:37:18,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145004498] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:18,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1950403807] [2023-11-23 20:37:18,660 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:37:18,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:18,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:18,680 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:18,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:37:18,804 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-23 20:37:18,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:37:18,807 INFO L262 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 62 conjunts are in the unsatisfiable core [2023-11-23 20:37:18,815 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:18,830 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-23 20:37:18,840 INFO L378 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 11 treesize of output 7 [2023-11-23 20:37:19,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:37:19,390 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 23 [2023-11-23 20:37:19,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:37:19,396 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 1 [2023-11-23 20:37:19,397 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:37:19,398 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:19,757 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_100 (Array Int Int))) (< (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#b~0#1.base| v_ArrVal_100) |c_ULTIMATE.start_main_~#a~0#1.base|) |c_ULTIMATE.start_main_~#a~0#1.offset|) 5)) is different from false [2023-11-23 20:37:19,758 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1950403807] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:19,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [591696895] [2023-11-23 20:37:19,761 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 20:37:19,761 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:19,762 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-23 20:37:19,762 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:37:19,762 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2023-11-23 20:37:19,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856300129] [2023-11-23 20:37:19,763 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:19,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-23 20:37:19,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:19,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-23 20:37:19,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=512, Unknown=2, NotChecked=46, Total=650 [2023-11-23 20:37:19,766 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 25 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 24 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 10 states have return successors, (11), 7 states have call predecessors, (11), 10 states have call successors, (11) [2023-11-23 20:37:20,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:20,270 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2023-11-23 20:37:20,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-23 20:37:20,277 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 24 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 10 states have return successors, (11), 7 states have call predecessors, (11), 10 states have call successors, (11) Word has length 35 [2023-11-23 20:37:20,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:20,280 INFO L225 Difference]: With dead ends: 54 [2023-11-23 20:37:20,281 INFO L226 Difference]: Without dead ends: 30 [2023-11-23 20:37:20,282 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=958, Unknown=2, NotChecked=64, Total=1190 [2023-11-23 20:37:20,288 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 10 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:20,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 88 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 221 Invalid, 1 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:37:20,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-11-23 20:37:20,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-11-23 20:37:20,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 19 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 8 states have return successors, (10), 8 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 20:37:20,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2023-11-23 20:37:20,306 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 35 [2023-11-23 20:37:20,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:20,307 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2023-11-23 20:37:20,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 24 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 10 states have return successors, (11), 7 states have call predecessors, (11), 10 states have call successors, (11) [2023-11-23 20:37:20,307 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2023-11-23 20:37:20,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-11-23 20:37:20,311 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:20,311 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 8, 8, 8, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:20,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:37:20,541 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:20,542 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:37:20,542 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:20,542 INFO L85 PathProgramCache]: Analyzing trace with hash 201752453, now seen corresponding path program 3 times [2023-11-23 20:37:20,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:20,542 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040426477] [2023-11-23 20:37:20,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:20,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:20,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:21,939 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 11 proven. 144 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-11-23 20:37:21,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:21,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040426477] [2023-11-23 20:37:21,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040426477] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:21,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949239452] [2023-11-23 20:37:21,940 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 20:37:21,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:21,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:21,942 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:21,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:37:22,070 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 20:37:22,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:37:22,073 INFO L262 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 62 conjunts are in the unsatisfiable core [2023-11-23 20:37:22,079 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:22,084 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:37:22,365 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 121 proven. 24 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-11-23 20:37:22,367 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:24,664 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 4 proven. 165 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-23 20:37:24,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949239452] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:37:24,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1014407987] [2023-11-23 20:37:24,668 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 20:37:24,668 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:24,668 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-23 20:37:24,669 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:37:24,670 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 22] total 38 [2023-11-23 20:37:24,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639948262] [2023-11-23 20:37:24,670 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:24,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-11-23 20:37:24,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:24,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-11-23 20:37:24,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=1123, Unknown=0, NotChecked=0, Total=1406 [2023-11-23 20:37:24,674 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand has 38 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 32 states have internal predecessors, (56), 11 states have call successors, (17), 8 states have call predecessors, (17), 13 states have return successors, (23), 11 states have call predecessors, (23), 11 states have call successors, (23) [2023-11-23 20:37:25,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:25,114 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2023-11-23 20:37:25,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 20:37:25,116 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 32 states have internal predecessors, (56), 11 states have call successors, (17), 8 states have call predecessors, (17), 13 states have return successors, (23), 11 states have call predecessors, (23), 11 states have call successors, (23) Word has length 71 [2023-11-23 20:37:25,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:25,117 INFO L225 Difference]: With dead ends: 62 [2023-11-23 20:37:25,117 INFO L226 Difference]: Without dead ends: 34 [2023-11-23 20:37:25,119 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 761 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=390, Invalid=1590, Unknown=0, NotChecked=0, Total=1980 [2023-11-23 20:37:25,120 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 24 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:25,120 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 164 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:37:25,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-23 20:37:25,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-11-23 20:37:25,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 19 states have (on average 1.105263157894737) internal successors, (21), 21 states have internal predecessors, (21), 4 states have call successors, (4), 2 states have call predecessors, (4), 10 states have return successors, (12), 10 states have call predecessors, (12), 4 states have call successors, (12) [2023-11-23 20:37:25,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2023-11-23 20:37:25,131 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 71 [2023-11-23 20:37:25,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:25,132 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2023-11-23 20:37:25,132 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 32 states have internal predecessors, (56), 11 states have call successors, (17), 8 states have call predecessors, (17), 13 states have return successors, (23), 11 states have call predecessors, (23), 11 states have call successors, (23) [2023-11-23 20:37:25,132 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2023-11-23 20:37:25,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2023-11-23 20:37:25,134 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:25,134 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 12, 12, 12, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:25,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:37:25,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:25,355 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:37:25,355 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:25,356 INFO L85 PathProgramCache]: Analyzing trace with hash 2066322437, now seen corresponding path program 4 times [2023-11-23 20:37:25,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:25,356 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372071851] [2023-11-23 20:37:25,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:25,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:25,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:33,753 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 18 proven. 64 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2023-11-23 20:37:33,753 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:33,754 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372071851] [2023-11-23 20:37:33,754 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372071851] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:33,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734179445] [2023-11-23 20:37:33,755 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 20:37:33,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:33,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:33,757 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:33,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:37:33,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:33,944 INFO L262 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 140 conjunts are in the unsatisfiable core [2023-11-23 20:37:33,960 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:33,968 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-23 20:37:33,972 INFO L378 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 11 treesize of output 7 [2023-11-23 20:37:36,266 WARN L854 $PredicateComparison]: unable to prove that (or (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |c_#memory_int| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |c_#memory_int|) (exists ((|v_old(#memory_int)_AFTER_CALL_28| (Array Int (Array Int Int)))) (let ((.cse0 (@diff |v_old(#memory_int)_AFTER_CALL_28| |c_#memory_int|))) (and (= (store |v_old(#memory_int)_AFTER_CALL_28| .cse0 (select |c_#memory_int| .cse0)) |c_#memory_int|) (= .cse0 |c_func_to_recursive_line_21_to_21_0_#in~b.base|) (= |v_old(#memory_int)_AFTER_CALL_28| (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_old(#memory_int)_AFTER_CALL_28| |c_func_to_recursive_line_21_to_21_0_#in~b.base|))))))) is different from false [2023-11-23 20:37:38,268 WARN L876 $PredicateComparison]: unable to prove that (or (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |c_#memory_int| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |c_#memory_int|) (exists ((|v_old(#memory_int)_AFTER_CALL_28| (Array Int (Array Int Int)))) (let ((.cse0 (@diff |v_old(#memory_int)_AFTER_CALL_28| |c_#memory_int|))) (and (= (store |v_old(#memory_int)_AFTER_CALL_28| .cse0 (select |c_#memory_int| .cse0)) |c_#memory_int|) (= .cse0 |c_func_to_recursive_line_21_to_21_0_#in~b.base|) (= |v_old(#memory_int)_AFTER_CALL_28| (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_old(#memory_int)_AFTER_CALL_28| |c_func_to_recursive_line_21_to_21_0_#in~b.base|))))))) is different from true [2023-11-23 20:37:40,306 WARN L854 $PredicateComparison]: unable to prove that (or (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |c_#memory_int| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |c_#memory_int|) (exists ((|v_#memory_int_BEFORE_CALL_47| (Array Int (Array Int Int)))) (let ((.cse0 (@diff |v_#memory_int_BEFORE_CALL_47| |c_#memory_int|))) (and (= (store |v_#memory_int_BEFORE_CALL_47| .cse0 (select |c_#memory_int| .cse0)) |c_#memory_int|) (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_#memory_int_BEFORE_CALL_47| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |v_#memory_int_BEFORE_CALL_47|) (= .cse0 |c_func_to_recursive_line_21_to_21_0_#in~b.base|))))) is different from false [2023-11-23 20:37:42,309 WARN L876 $PredicateComparison]: unable to prove that (or (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |c_#memory_int| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |c_#memory_int|) (exists ((|v_#memory_int_BEFORE_CALL_47| (Array Int (Array Int Int)))) (let ((.cse0 (@diff |v_#memory_int_BEFORE_CALL_47| |c_#memory_int|))) (and (= (store |v_#memory_int_BEFORE_CALL_47| .cse0 (select |c_#memory_int| .cse0)) |c_#memory_int|) (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_#memory_int_BEFORE_CALL_47| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |v_#memory_int_BEFORE_CALL_47|) (= .cse0 |c_func_to_recursive_line_21_to_21_0_#in~b.base|))))) is different from true [2023-11-23 20:37:44,617 WARN L854 $PredicateComparison]: unable to prove that (or (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |c_#memory_int| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |c_#memory_int|) (exists ((|v_#memory_int_BEFORE_CALL_60| (Array Int (Array Int Int)))) (let ((.cse0 (@diff |v_#memory_int_BEFORE_CALL_60| |c_#memory_int|))) (and (= .cse0 |c_func_to_recursive_line_21_to_21_0_#in~b.base|) (= (store |v_#memory_int_BEFORE_CALL_60| .cse0 (select |c_#memory_int| .cse0)) |c_#memory_int|) (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_#memory_int_BEFORE_CALL_60| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |v_#memory_int_BEFORE_CALL_60|))))) is different from false [2023-11-23 20:37:46,619 WARN L876 $PredicateComparison]: unable to prove that (or (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |c_#memory_int| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |c_#memory_int|) (exists ((|v_#memory_int_BEFORE_CALL_60| (Array Int (Array Int Int)))) (let ((.cse0 (@diff |v_#memory_int_BEFORE_CALL_60| |c_#memory_int|))) (and (= .cse0 |c_func_to_recursive_line_21_to_21_0_#in~b.base|) (= (store |v_#memory_int_BEFORE_CALL_60| .cse0 (select |c_#memory_int| .cse0)) |c_#memory_int|) (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_#memory_int_BEFORE_CALL_60| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |v_#memory_int_BEFORE_CALL_60|))))) is different from true [2023-11-23 20:37:47,003 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 21 proven. 75 refuted. 0 times theorem prover too weak. 313 trivial. 36 not checked. [2023-11-23 20:37:47,003 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:47,801 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734179445] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:47,802 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [579186721] [2023-11-23 20:37:47,804 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 20:37:47,804 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:47,805 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-23 20:37:47,805 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:37:47,805 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18] total 27 [2023-11-23 20:37:47,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353556446] [2023-11-23 20:37:47,806 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:47,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-23 20:37:47,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:47,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-23 20:37:47,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=550, Unknown=8, NotChecked=150, Total=812 [2023-11-23 20:37:47,808 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 28 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (16), 13 states have call predecessors, (16), 9 states have call successors, (16) [2023-11-23 20:37:49,976 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse0 (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |c_#memory_int| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |c_#memory_int|))) (and (or .cse0 (exists ((|v_#memory_int_BEFORE_CALL_60| (Array Int (Array Int Int)))) (let ((.cse1 (@diff |v_#memory_int_BEFORE_CALL_60| |c_#memory_int|))) (and (= .cse1 |c_func_to_recursive_line_21_to_21_0_#in~b.base|) (= (store |v_#memory_int_BEFORE_CALL_60| .cse1 (select |c_#memory_int| .cse1)) |c_#memory_int|) (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_#memory_int_BEFORE_CALL_60| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |v_#memory_int_BEFORE_CALL_60|))))) (= (store |c_old(#memory_int)| c_func_to_recursive_line_21_to_21_0_~b.base (select |c_#memory_int| c_func_to_recursive_line_21_to_21_0_~b.base)) |c_#memory_int|) (or .cse0 (exists ((|v_#memory_int_BEFORE_CALL_47| (Array Int (Array Int Int)))) (let ((.cse2 (@diff |v_#memory_int_BEFORE_CALL_47| |c_#memory_int|))) (and (= (store |v_#memory_int_BEFORE_CALL_47| .cse2 (select |c_#memory_int| .cse2)) |c_#memory_int|) (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_#memory_int_BEFORE_CALL_47| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |v_#memory_int_BEFORE_CALL_47|) (= .cse2 |c_func_to_recursive_line_21_to_21_0_#in~b.base|))))) (= |c_func_to_recursive_line_21_to_21_0_#in~b.base| c_func_to_recursive_line_21_to_21_0_~b.base) (or .cse0 (exists ((|v_old(#memory_int)_AFTER_CALL_28| (Array Int (Array Int Int)))) (let ((.cse3 (@diff |v_old(#memory_int)_AFTER_CALL_28| |c_#memory_int|))) (and (= (store |v_old(#memory_int)_AFTER_CALL_28| .cse3 (select |c_#memory_int| .cse3)) |c_#memory_int|) (= .cse3 |c_func_to_recursive_line_21_to_21_0_#in~b.base|) (= |v_old(#memory_int)_AFTER_CALL_28| (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_old(#memory_int)_AFTER_CALL_28| |c_func_to_recursive_line_21_to_21_0_#in~b.base|))))))))) is different from false [2023-11-23 20:37:51,978 WARN L876 $PredicateComparison]: unable to prove that (let ((.cse0 (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |c_#memory_int| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |c_#memory_int|))) (and (or .cse0 (exists ((|v_#memory_int_BEFORE_CALL_60| (Array Int (Array Int Int)))) (let ((.cse1 (@diff |v_#memory_int_BEFORE_CALL_60| |c_#memory_int|))) (and (= .cse1 |c_func_to_recursive_line_21_to_21_0_#in~b.base|) (= (store |v_#memory_int_BEFORE_CALL_60| .cse1 (select |c_#memory_int| .cse1)) |c_#memory_int|) (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_#memory_int_BEFORE_CALL_60| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |v_#memory_int_BEFORE_CALL_60|))))) (= (store |c_old(#memory_int)| c_func_to_recursive_line_21_to_21_0_~b.base (select |c_#memory_int| c_func_to_recursive_line_21_to_21_0_~b.base)) |c_#memory_int|) (or .cse0 (exists ((|v_#memory_int_BEFORE_CALL_47| (Array Int (Array Int Int)))) (let ((.cse2 (@diff |v_#memory_int_BEFORE_CALL_47| |c_#memory_int|))) (and (= (store |v_#memory_int_BEFORE_CALL_47| .cse2 (select |c_#memory_int| .cse2)) |c_#memory_int|) (= (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_#memory_int_BEFORE_CALL_47| |c_func_to_recursive_line_21_to_21_0_#in~b.base|)) |v_#memory_int_BEFORE_CALL_47|) (= .cse2 |c_func_to_recursive_line_21_to_21_0_#in~b.base|))))) (= |c_func_to_recursive_line_21_to_21_0_#in~b.base| c_func_to_recursive_line_21_to_21_0_~b.base) (or .cse0 (exists ((|v_old(#memory_int)_AFTER_CALL_28| (Array Int (Array Int Int)))) (let ((.cse3 (@diff |v_old(#memory_int)_AFTER_CALL_28| |c_#memory_int|))) (and (= (store |v_old(#memory_int)_AFTER_CALL_28| .cse3 (select |c_#memory_int| .cse3)) |c_#memory_int|) (= .cse3 |c_func_to_recursive_line_21_to_21_0_#in~b.base|) (= |v_old(#memory_int)_AFTER_CALL_28| (store |c_old(#memory_int)| |c_func_to_recursive_line_21_to_21_0_#in~b.base| (select |v_old(#memory_int)_AFTER_CALL_28| |c_func_to_recursive_line_21_to_21_0_#in~b.base|))))))))) is different from true [2023-11-23 20:37:52,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:52,294 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2023-11-23 20:37:52,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-23 20:37:52,295 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (16), 13 states have call predecessors, (16), 9 states have call successors, (16) Word has length 91 [2023-11-23 20:37:52,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:52,297 INFO L225 Difference]: With dead ends: 42 [2023-11-23 20:37:52,297 INFO L226 Difference]: Without dead ends: 38 [2023-11-23 20:37:52,298 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 122 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=158, Invalid=778, Unknown=10, NotChecked=244, Total=1190 [2023-11-23 20:37:52,298 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 110 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:52,299 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 95 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 193 Invalid, 1 Unknown, 110 Unchecked, 0.3s Time] [2023-11-23 20:37:52,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-23 20:37:52,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-11-23 20:37:52,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 23 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 12 states have return successors, (14), 12 states have call predecessors, (14), 4 states have call successors, (14) [2023-11-23 20:37:52,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2023-11-23 20:37:52,307 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 91 [2023-11-23 20:37:52,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:52,308 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2023-11-23 20:37:52,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (16), 13 states have call predecessors, (16), 9 states have call successors, (16) [2023-11-23 20:37:52,308 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2023-11-23 20:37:52,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2023-11-23 20:37:52,310 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:52,311 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 24, 24, 24, 5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:52,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 20:37:52,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c3bcd78-56d8-4aaa-8338-4de9d7a1d6e1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 20:37:52,525 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:37:52,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:52,525 INFO L85 PathProgramCache]: Analyzing trace with hash -748806787, now seen corresponding path program 5 times [2023-11-23 20:37:52,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:52,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348783992] [2023-11-23 20:37:52,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:52,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:52,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat