./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursified_nla-digbench/recursified_ps5-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursified_nla-digbench/recursified_ps5-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh --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 02d2a7ecaeb1f9a3fd2c207ee063800bfd7475435ba7bc7e95648b1704092bfe --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:37:36,754 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:37:36,819 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 14:37:36,823 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:37:36,824 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:37:36,847 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:37:36,848 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:37:36,848 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:37:36,849 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:37:36,849 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:37:36,850 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:37:36,851 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:37:36,851 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:37:36,852 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:37:36,852 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:37:36,853 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:37:36,853 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:37:36,854 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:37:36,854 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:37:36,855 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:37:36,855 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:37:36,856 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:37:36,857 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:37:36,857 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:37:36,858 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 14:37:36,858 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:37:36,859 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 14:37:36,859 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:37:36,859 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:37:36,860 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:37:36,860 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:37:36,861 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 14:37:36,861 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:37:36,861 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:37:36,861 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:37:36,862 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:37:36,862 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:37:36,862 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:37:36,862 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:37:36,862 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:37:36,863 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:37:36,863 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:37:36,863 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:37:36,863 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:37:36,863 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:37:36,864 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:37:36,864 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:37:36,864 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_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 02d2a7ecaeb1f9a3fd2c207ee063800bfd7475435ba7bc7e95648b1704092bfe [2023-12-02 14:37:37,097 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:37:37,117 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:37:37,120 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:37:37,121 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:37:37,122 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:37:37,123 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/recursified_nla-digbench/recursified_ps5-ll.c [2023-12-02 14:37:39,908 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:37:40,074 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:37:40,074 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/sv-benchmarks/c/recursified_nla-digbench/recursified_ps5-ll.c [2023-12-02 14:37:40,081 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/data/2db3c29b7/598053a20db4454b878a9426ca90b113/FLAG781cad5df [2023-12-02 14:37:40,094 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/data/2db3c29b7/598053a20db4454b878a9426ca90b113 [2023-12-02 14:37:40,097 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:37:40,098 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:37:40,100 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:37:40,100 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:37:40,105 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:37:40,106 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,107 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@721aa94b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40, skipping insertion in model container [2023-12-02 14:37:40,107 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,130 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:37:40,277 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_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/sv-benchmarks/c/recursified_nla-digbench/recursified_ps5-ll.c[987,1000] [2023-12-02 14:37:40,295 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:37:40,306 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:37:40,318 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_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/sv-benchmarks/c/recursified_nla-digbench/recursified_ps5-ll.c[987,1000] [2023-12-02 14:37:40,330 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:37:40,345 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:37:40,346 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40 WrapperNode [2023-12-02 14:37:40,346 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:37:40,347 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:37:40,347 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:37:40,347 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:37:40,354 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,362 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,380 INFO L138 Inliner]: procedures = 16, calls = 74, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2023-12-02 14:37:40,380 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:37:40,381 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:37:40,381 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:37:40,381 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:37:40,387 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,388 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,391 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,391 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,397 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,398 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,400 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,401 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,404 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:37:40,404 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:37:40,404 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:37:40,404 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:37:40,405 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (1/1) ... [2023-12-02 14:37:40,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:37:40,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:40,431 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:37:40,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:37:40,456 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:37:40,456 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:37:40,456 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 14:37:40,456 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 14:37:40,456 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:37:40,456 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:37:40,456 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 14:37:40,457 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 14:37:40,457 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 14:37:40,457 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_27_to_35_0 [2023-12-02 14:37:40,457 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_27_to_35_0 [2023-12-02 14:37:40,457 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 14:37:40,534 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:37:40,536 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:37:40,712 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:37:40,766 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:37:40,766 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-12-02 14:37:40,768 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:37:40 BoogieIcfgContainer [2023-12-02 14:37:40,768 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:37:40,771 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:37:40,771 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:37:40,774 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:37:40,774 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:37:40" (1/3) ... [2023-12-02 14:37:40,775 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@783207b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:37:40, skipping insertion in model container [2023-12-02 14:37:40,775 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:40" (2/3) ... [2023-12-02 14:37:40,776 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@783207b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:37:40, skipping insertion in model container [2023-12-02 14:37:40,776 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:37:40" (3/3) ... [2023-12-02 14:37:40,777 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_ps5-ll.c [2023-12-02 14:37:40,797 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:37:40,797 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 14:37:40,841 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:37:40,846 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;@13c14814, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:37:40,846 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 14:37:40,849 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 15 states have internal predecessors, (17), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 14:37:40,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 14:37:40,855 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:40,856 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:37:40,856 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:40,861 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:40,861 INFO L85 PathProgramCache]: Analyzing trace with hash 1855799543, now seen corresponding path program 1 times [2023-12-02 14:37:40,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:40,869 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534274354] [2023-12-02 14:37:40,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:40,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:40,986 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:37:40,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1149992810] [2023-12-02 14:37:40,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:40,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:40,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:40,990 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:40,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:37:41,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:41,144 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 51 conjunts are in the unsatisfiable core [2023-12-02 14:37:41,152 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:41,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:41,311 INFO L349 Elim1Store]: treesize reduction 40, result has 35.5 percent of original size [2023-12-02 14:37:41,312 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 45 [2023-12-02 14:37:41,342 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-12-02 14:37:41,342 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 113 treesize of output 109 [2023-12-02 14:37:41,402 INFO L349 Elim1Store]: treesize reduction 29, result has 23.7 percent of original size [2023-12-02 14:37:41,403 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 50 [2023-12-02 14:37:41,646 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:37:41,647 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:37:41,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:41,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534274354] [2023-12-02 14:37:41,647 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 14:37:41,648 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149992810] [2023-12-02 14:37:41,648 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149992810] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:37:41,649 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:37:41,649 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 14:37:41,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751714007] [2023-12-02 14:37:41,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:37:41,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 14:37:41,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:41,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 14:37:41,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-12-02 14:37:41,679 INFO L87 Difference]: Start difference. First operand has 22 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 15 states have internal predecessors, (17), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:37:41,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:41,983 INFO L93 Difference]: Finished difference Result 58 states and 80 transitions. [2023-12-02 14:37:41,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 14:37:41,985 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-12-02 14:37:41,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:41,993 INFO L225 Difference]: With dead ends: 58 [2023-12-02 14:37:41,993 INFO L226 Difference]: Without dead ends: 35 [2023-12-02 14:37:41,996 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:37:42,000 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 16 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:42,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 74 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:37:42,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-12-02 14:37:42,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 31. [2023-12-02 14:37:42,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 20 states have (on average 1.15) internal successors, (23), 22 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2023-12-02 14:37:42,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-12-02 14:37:42,042 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 8 [2023-12-02 14:37:42,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:42,042 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-12-02 14:37:42,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:37:42,043 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-12-02 14:37:42,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 14:37:42,044 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:42,044 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:37:42,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:37:42,249 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-12-02 14:37:42,249 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:42,250 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:42,250 INFO L85 PathProgramCache]: Analyzing trace with hash 1392350713, now seen corresponding path program 1 times [2023-12-02 14:37:42,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:42,250 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888260415] [2023-12-02 14:37:42,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:42,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:42,288 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:37:42,289 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [529950845] [2023-12-02 14:37:42,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:42,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:42,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:42,291 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:42,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:37:42,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:42,564 INFO L262 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 96 conjunts are in the unsatisfiable core [2023-12-02 14:37:42,571 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:42,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:42,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:42,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:42,741 INFO L349 Elim1Store]: treesize reduction 127, result has 27.4 percent of original size [2023-12-02 14:37:42,742 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 3 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 110 treesize of output 207 [2023-12-02 14:37:42,782 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-12-02 14:37:42,782 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 92 treesize of output 86 [2023-12-02 14:37:42,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:42,839 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:37:42,902 INFO L349 Elim1Store]: treesize reduction 103, result has 14.9 percent of original size [2023-12-02 14:37:42,902 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 3 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 104 treesize of output 130 [2023-12-02 14:37:42,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:42,951 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:37:43,007 INFO L349 Elim1Store]: treesize reduction 90, result has 15.9 percent of original size [2023-12-02 14:37:43,007 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 84 treesize of output 69 [2023-12-02 14:37:43,171 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:37:43,246 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 52 [2023-12-02 14:37:43,301 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:37:43,320 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:37:43,337 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:37:43,409 INFO L349 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2023-12-02 14:37:43,410 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 37 [2023-12-02 14:37:43,583 INFO L349 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2023-12-02 14:37:43,584 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 82 [2023-12-02 14:37:43,649 INFO L349 Elim1Store]: treesize reduction 20, result has 4.8 percent of original size [2023-12-02 14:37:43,650 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 30 treesize of output 18 [2023-12-02 14:37:44,012 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 21 [2023-12-02 14:37:44,053 WARN L214 Elim1Store]: Array PQE input equivalent to false [2023-12-02 14:37:44,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:44,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:44,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:44,321 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 146 treesize of output 53 [2023-12-02 14:37:44,547 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:37:44,547 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:37:48,532 WARN L854 $PredicateComparison]: unable to prove that (forall ((func_to_recursive_line_27_to_35_0_~c.offset Int)) (let ((.cse6 (store |c_#memory_int| c_func_to_recursive_line_27_to_35_0_~c.base (let ((.cse8 (select |c_#memory_int| c_func_to_recursive_line_27_to_35_0_~c.base))) (store .cse8 func_to_recursive_line_27_to_35_0_~c.offset (+ (select .cse8 func_to_recursive_line_27_to_35_0_~c.offset) 1)))))) (let ((.cse7 (select .cse6 c_func_to_recursive_line_27_to_35_0_~y.base))) (let ((.cse1 (select .cse7 c_func_to_recursive_line_27_to_35_0_~y.offset))) (let ((.cse5 (+ .cse1 1))) (let ((.cse3 (store .cse6 c_func_to_recursive_line_27_to_35_0_~y.base (store .cse7 c_func_to_recursive_line_27_to_35_0_~y.offset .cse5)))) (let ((.cse4 (select .cse3 c_func_to_recursive_line_27_to_35_0_~x.base))) (let ((.cse2 (select .cse4 c_func_to_recursive_line_27_to_35_0_~x.offset))) (let ((.cse0 (select (select (store .cse3 c_func_to_recursive_line_27_to_35_0_~x.base (store .cse4 c_func_to_recursive_line_27_to_35_0_~x.offset (+ .cse2 (* .cse5 (* .cse5 (* .cse5 .cse5)))))) c_func_to_recursive_line_27_to_35_0_~y.base) c_func_to_recursive_line_27_to_35_0_~y.offset))) (= (+ (* (* .cse0 .cse0 .cse0 .cse0 .cse0) 6) (* (* .cse0 .cse0 .cse0 .cse0) 15) (* (* .cse0 .cse0 .cse0) 10)) (+ (* (* .cse1 .cse1 .cse1) 120) .cse0 (* 180 (* .cse1 .cse1)) (* .cse1 120) 30 (* (* .cse1 .cse1 .cse1 .cse1) 30) (* 30 .cse2)))))))))))) is different from false [2023-12-02 14:37:48,775 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:48,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888260415] [2023-12-02 14:37:48,775 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 14:37:48,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529950845] [2023-12-02 14:37:48,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529950845] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:48,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [8263213] [2023-12-02 14:37:48,796 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:37:48,796 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:37:48,800 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) [2023-12-02 14:37:48,802 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:37:48,802 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2023-12-02 14:37:48,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386211416] [2023-12-02 14:37:48,802 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 14:37:48,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 14:37:48,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:48,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 14:37:48,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=202, Unknown=1, NotChecked=28, Total=272 [2023-12-02 14:37:48,805 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 11 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 14:37:49,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:49,308 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2023-12-02 14:37:49,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 14:37:49,309 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-12-02 14:37:49,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:49,312 INFO L225 Difference]: With dead ends: 57 [2023-12-02 14:37:49,312 INFO L226 Difference]: Without dead ends: 55 [2023-12-02 14:37:49,313 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=69, Invalid=314, Unknown=1, NotChecked=36, Total=420 [2023-12-02 14:37:49,314 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 26 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:49,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 111 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:37:49,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-12-02 14:37:49,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2023-12-02 14:37:49,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 37 states have internal predecessors, (39), 10 states have call successors, (10), 7 states have call predecessors, (10), 8 states have return successors, (11), 9 states have call predecessors, (11), 8 states have call successors, (11) [2023-12-02 14:37:49,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2023-12-02 14:37:49,331 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 18 [2023-12-02 14:37:49,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:49,331 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2023-12-02 14:37:49,331 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 14:37:49,331 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2023-12-02 14:37:49,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 14:37:49,332 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:49,332 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:37:49,338 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:37:49,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:49,533 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:49,533 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:49,534 INFO L85 PathProgramCache]: Analyzing trace with hash 689571631, now seen corresponding path program 1 times [2023-12-02 14:37:49,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:49,534 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148749240] [2023-12-02 14:37:49,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:49,534 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:49,561 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:37:49,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1611560914] [2023-12-02 14:37:49,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:49,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:49,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:49,563 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:49,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:37:49,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:49,666 WARN L260 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 100 conjunts are in the unsatisfiable core [2023-12-02 14:37:49,671 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:49,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:49,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:49,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:49,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:49,810 INFO L349 Elim1Store]: treesize reduction 111, result has 30.2 percent of original size [2023-12-02 14:37:49,811 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 3 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 78 treesize of output 191 [2023-12-02 14:37:49,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:49,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:49,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:37:49,860 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:37:49,910 INFO L349 Elim1Store]: treesize reduction 90, result has 15.9 percent of original size [2023-12-02 14:37:49,910 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 88 treesize of output 71 [2023-12-02 14:37:49,940 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-12-02 14:37:49,940 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 104 treesize of output 98 [2023-12-02 14:37:50,052 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:37:50,076 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:37:50,094 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:37:50,136 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:37:50,156 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2023-12-02 14:37:50,225 INFO L349 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2023-12-02 14:37:50,225 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 94 treesize of output 97 [2023-12-02 14:37:50,327 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:37:50,332 INFO L349 Elim1Store]: treesize reduction 18, result has 5.3 percent of original size [2023-12-02 14:37:50,332 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 11 [2023-12-02 14:37:50,382 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:37:50,387 INFO L349 Elim1Store]: treesize reduction 18, result has 5.3 percent of original size [2023-12-02 14:37:50,387 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 11 [2023-12-02 14:37:50,658 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 21 [2023-12-02 14:37:51,164 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:37:51,164 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:37:52,816 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:37:52,817 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 170 treesize of output 70 [2023-12-02 14:37:53,552 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:37:53,552 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:53,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148749240] [2023-12-02 14:37:53,552 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 14:37:53,553 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611560914] [2023-12-02 14:37:53,553 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611560914] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:37:53,553 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [489632969] [2023-12-02 14:37:53,554 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 14:37:53,554 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:37:53,555 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:37:53,559 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:37:53,560 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:37:53,993 INFO L197 IcfgInterpreter]: Interpreting procedure func_to_recursive_line_27_to_35_0 with input of size 106 for LOIs [2023-12-02 14:37:54,689 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 172 for LOIs [2023-12-02 14:37:54,962 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:38:03,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [489632969] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:38:03,339 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:38:03,339 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [12, 13] total 32 [2023-12-02 14:38:03,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37945590] [2023-12-02 14:38:03,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:38:03,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 14:38:03,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:38:03,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 14:38:03,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=841, Unknown=1, NotChecked=0, Total=992 [2023-12-02 14:38:03,342 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 12 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:38:06,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:38:06,163 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2023-12-02 14:38:06,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 14:38:06,164 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2023-12-02 14:38:06,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:38:06,165 INFO L225 Difference]: With dead ends: 59 [2023-12-02 14:38:06,165 INFO L226 Difference]: Without dead ends: 55 [2023-12-02 14:38:06,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=168, Invalid=953, Unknown=1, NotChecked=0, Total=1122 [2023-12-02 14:38:06,166 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 3 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:38:06,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 53 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 14:38:06,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-12-02 14:38:06,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2023-12-02 14:38:06,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 38 states have internal predecessors, (40), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (11), 9 states have call predecessors, (11), 8 states have call successors, (11) [2023-12-02 14:38:06,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2023-12-02 14:38:06,179 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 18 [2023-12-02 14:38:06,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:38:06,180 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2023-12-02 14:38:06,180 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:38:06,180 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2023-12-02 14:38:06,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 14:38:06,181 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:38:06,181 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:38:06,185 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:38:06,381 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:38:06,381 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:38:06,382 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:38:06,382 INFO L85 PathProgramCache]: Analyzing trace with hash -770109392, now seen corresponding path program 1 times [2023-12-02 14:38:06,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:38:06,382 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1418668040] [2023-12-02 14:38:06,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:38:06,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:38:06,405 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:38:06,405 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [902007837] [2023-12-02 14:38:06,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:38:06,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:38:06,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:38:06,407 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:38:06,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:38:06,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:38:06,521 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 14:38:06,524 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:38:06,550 INFO L349 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2023-12-02 14:38:06,550 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 27 [2023-12-02 14:38:06,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,555 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 27 treesize of output 20 [2023-12-02 14:38:06,558 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 [2023-12-02 14:38:06,569 INFO L349 Elim1Store]: treesize reduction 23, result has 4.2 percent of original size [2023-12-02 14:38:06,569 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 21 [2023-12-02 14:38:06,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,578 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2023-12-02 14:38:06,585 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 11 [2023-12-02 14:38:06,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,599 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 37 [2023-12-02 14:38:06,606 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:06,607 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:06,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,622 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 42 [2023-12-02 14:38:06,627 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:06,628 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:06,628 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:06,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,642 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 37 [2023-12-02 14:38:06,646 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:06,647 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:06,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,654 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2023-12-02 14:38:06,658 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:06,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,667 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2023-12-02 14:38:06,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,674 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 17 [2023-12-02 14:38:06,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,679 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 8 treesize of output 1 [2023-12-02 14:38:06,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:06,690 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 37 [2023-12-02 14:38:06,695 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:06,803 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:38:06,803 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:38:07,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:38:07,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1418668040] [2023-12-02 14:38:07,000 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 14:38:07,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902007837] [2023-12-02 14:38:07,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902007837] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:38:07,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1321177138] [2023-12-02 14:38:07,003 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 14:38:07,003 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:38:07,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:38:07,003 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:38:07,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:38:07,932 INFO L197 IcfgInterpreter]: Interpreting procedure func_to_recursive_line_27_to_35_0 with input of size 106 for LOIs [2023-12-02 14:38:08,400 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 14:38:08,404 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:38:16,221 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '847#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:38:16,222 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:38:16,222 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:38:16,222 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2023-12-02 14:38:16,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142644787] [2023-12-02 14:38:16,222 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 14:38:16,222 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 14:38:16,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:38:16,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 14:38:16,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=548, Unknown=1, NotChecked=0, Total=650 [2023-12-02 14:38:16,224 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-12-02 14:38:16,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:38:16,484 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2023-12-02 14:38:16,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 14:38:16,484 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-12-02 14:38:16,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:38:16,485 INFO L225 Difference]: With dead ends: 59 [2023-12-02 14:38:16,486 INFO L226 Difference]: Without dead ends: 45 [2023-12-02 14:38:16,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=173, Invalid=948, Unknown=1, NotChecked=0, Total=1122 [2023-12-02 14:38:16,487 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 22 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 11 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:38:16,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 56 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 118 Invalid, 2 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:38:16,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-12-02 14:38:16,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2023-12-02 14:38:16,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 29 states have (on average 1.103448275862069) internal successors, (32), 31 states have internal predecessors, (32), 8 states have call successors, (8), 6 states have call predecessors, (8), 7 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2023-12-02 14:38:16,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2023-12-02 14:38:16,497 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 24 [2023-12-02 14:38:16,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:38:16,498 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2023-12-02 14:38:16,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-12-02 14:38:16,498 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2023-12-02 14:38:16,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-12-02 14:38:16,498 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:38:16,499 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2023-12-02 14:38:16,503 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 14:38:16,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:38:16,699 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:38:16,699 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:38:16,700 INFO L85 PathProgramCache]: Analyzing trace with hash 1484853371, now seen corresponding path program 2 times [2023-12-02 14:38:16,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:38:16,700 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510003099] [2023-12-02 14:38:16,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:38:16,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:38:16,726 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:38:16,727 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1539912128] [2023-12-02 14:38:16,727 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:38:16,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:38:16,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:38:16,728 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:38:16,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:38:48,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 14:38:48,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:38:48,036 INFO L262 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 153 conjunts are in the unsatisfiable core [2023-12-02 14:38:48,043 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:38:48,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:48,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:48,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:48,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:48,251 INFO L349 Elim1Store]: treesize reduction 188, result has 24.5 percent of original size [2023-12-02 14:38:48,251 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 4 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 6 new quantified variables, introduced 4 case distinctions, treesize of input 130 treesize of output 333 [2023-12-02 14:38:48,284 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 19 [2023-12-02 14:38:48,325 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-12-02 14:38:48,325 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 122 treesize of output 112 [2023-12-02 14:38:48,363 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2023-12-02 14:38:48,438 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 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 41 treesize of output 47 [2023-12-02 14:38:48,494 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 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 41 treesize of output 47 [2023-12-02 14:38:48,556 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 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 41 treesize of output 47 [2023-12-02 14:38:49,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:49,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:49,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:49,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:49,444 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:49,448 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:49,518 INFO L349 Elim1Store]: treesize reduction 95, result has 15.2 percent of original size [2023-12-02 14:38:49,519 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 3 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 468 treesize of output 480 [2023-12-02 14:38:50,091 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 15 treesize of output 11 [2023-12-02 14:38:50,408 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:50,410 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 39 [2023-12-02 14:38:50,439 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:50,455 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:38:50,457 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 89 treesize of output 56 [2023-12-02 14:38:50,521 INFO L349 Elim1Store]: treesize reduction 20, result has 4.8 percent of original size [2023-12-02 14:38:50,521 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 27 [2023-12-02 14:38:50,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:50,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:50,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:50,760 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 146 treesize of output 53 [2023-12-02 14:38:51,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:51,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:51,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:38:51,601 INFO L349 Elim1Store]: treesize reduction 164, result has 33.6 percent of original size [2023-12-02 14:38:51,601 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 176 treesize of output 153 [2023-12-02 14:38:52,200 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 14:38:52,200 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 26 [2023-12-02 14:38:52,438 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:38:52,439 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:38:58,970 WARN L854 $PredicateComparison]: unable to prove that (forall ((func_to_recursive_line_27_to_35_0_~c.offset Int)) (let ((.cse6 (store |c_#memory_int| c_func_to_recursive_line_27_to_35_0_~c.base (let ((.cse8 (select |c_#memory_int| c_func_to_recursive_line_27_to_35_0_~c.base))) (store .cse8 func_to_recursive_line_27_to_35_0_~c.offset (+ (select .cse8 func_to_recursive_line_27_to_35_0_~c.offset) 1)))))) (let ((.cse7 (select .cse6 c_func_to_recursive_line_27_to_35_0_~y.base))) (let ((.cse1 (select .cse7 c_func_to_recursive_line_27_to_35_0_~y.offset))) (let ((.cse5 (+ .cse1 1))) (let ((.cse3 (store .cse6 c_func_to_recursive_line_27_to_35_0_~y.base (store .cse7 c_func_to_recursive_line_27_to_35_0_~y.offset .cse5)))) (let ((.cse4 (select .cse3 c_func_to_recursive_line_27_to_35_0_~x.base))) (let ((.cse2 (select .cse4 c_func_to_recursive_line_27_to_35_0_~x.offset))) (let ((.cse0 (select (select (store .cse3 c_func_to_recursive_line_27_to_35_0_~x.base (store .cse4 c_func_to_recursive_line_27_to_35_0_~x.offset (+ .cse2 (* .cse5 (* .cse5 (* .cse5 .cse5)))))) c_func_to_recursive_line_27_to_35_0_~y.base) c_func_to_recursive_line_27_to_35_0_~y.offset))) (= (+ (* (* .cse0 .cse0 .cse0 .cse0 .cse0) 6) (* (* .cse0 .cse0 .cse0 .cse0) 15) (* (* .cse0 .cse0 .cse0) 10)) (+ (* (* .cse1 .cse1 .cse1) 120) .cse0 (* 180 (* .cse1 .cse1)) (* .cse1 120) 30 (* (* .cse1 .cse1 .cse1 .cse1) 30) (* 30 .cse2)))))))))))) is different from false [2023-12-02 14:39:09,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:39:09,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510003099] [2023-12-02 14:39:09,558 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 14:39:09,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539912128] [2023-12-02 14:39:09,559 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539912128] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:39:09,559 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1147677230] [2023-12-02 14:39:09,561 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:39:09,561 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:39:09,561 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) [2023-12-02 14:39:09,562 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:39:09,562 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2023-12-02 14:39:09,563 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980457258] [2023-12-02 14:39:09,563 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 14:39:09,563 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 14:39:09,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:39:09,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 14:39:09,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=486, Unknown=3, NotChecked=44, Total=600 [2023-12-02 14:39:09,564 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand has 18 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 12 states have internal predecessors, (20), 6 states have call successors, (6), 6 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:39:14,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:39:14,248 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2023-12-02 14:39:14,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-12-02 14:39:14,249 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 12 states have internal predecessors, (20), 6 states have call successors, (6), 6 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2023-12-02 14:39:14,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:39:14,249 INFO L225 Difference]: With dead ends: 71 [2023-12-02 14:39:14,250 INFO L226 Difference]: Without dead ends: 69 [2023-12-02 14:39:14,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=134, Invalid=923, Unknown=3, NotChecked=62, Total=1122 [2023-12-02 14:39:14,251 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 34 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:39:14,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 183 Invalid, 457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-12-02 14:39:14,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-12-02 14:39:14,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2023-12-02 14:39:14,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 46 states have internal predecessors, (48), 12 states have call successors, (12), 9 states have call predecessors, (12), 11 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2023-12-02 14:39:14,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2023-12-02 14:39:14,263 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 28 [2023-12-02 14:39:14,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:39:14,263 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2023-12-02 14:39:14,263 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 12 states have internal predecessors, (20), 6 states have call successors, (6), 6 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:39:14,263 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2023-12-02 14:39:14,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-12-02 14:39:14,264 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:39:14,264 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:39:14,272 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 14:39:14,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:39:14,465 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:39:14,465 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:39:14,465 INFO L85 PathProgramCache]: Analyzing trace with hash 199269479, now seen corresponding path program 1 times [2023-12-02 14:39:14,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:39:14,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492038385] [2023-12-02 14:39:14,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:39:14,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:39:14,482 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:39:14,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1673466881] [2023-12-02 14:39:14,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:39:14,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:39:14,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:39:14,484 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:39:14,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:39:15,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:39:15,015 INFO L262 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 128 conjunts are in the unsatisfiable core [2023-12-02 14:39:15,025 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:39:15,036 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:39:15,038 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 30 treesize of output 28 [2023-12-02 14:39:15,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:39:15,074 INFO L349 Elim1Store]: treesize reduction 56, result has 30.9 percent of original size [2023-12-02 14:39:15,075 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 46 treesize of output 89 [2023-12-02 14:39:15,083 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:39:15,110 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:39:15,121 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:39:15,220 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 11 [2023-12-02 14:39:15,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:39:15,235 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 62 [2023-12-02 14:39:15,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:39:15,292 INFO L349 Elim1Store]: treesize reduction 92, result has 25.2 percent of original size [2023-12-02 14:39:15,292 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 56 treesize of output 114 [2023-12-02 14:39:15,303 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:39:15,361 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:39:15,372 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:39:15,384 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 14:39:15,490 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 16 [2023-12-02 14:39:23,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:39:23,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:39:23,620 INFO L349 Elim1Store]: treesize reduction 78, result has 19.6 percent of original size [2023-12-02 14:39:23,620 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 142 treesize of output 150 [2023-12-02 14:39:23,635 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2023-12-02 14:39:23,649 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2023-12-02 14:39:23,691 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2023-12-02 14:39:23,713 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:39:23,714 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 26 treesize of output 5 [2023-12-02 14:39:25,974 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:39:25,974 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:39:42,539 WARN L293 SmtUtils]: Spent 16.23s on a formula simplification that was a NOOP. DAG size: 124 (called from [L 279] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2023-12-02 14:39:48,269 WARN L293 SmtUtils]: Spent 5.73s on a formula simplification that was a NOOP. DAG size: 93 (called from [L 302] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2023-12-02 14:39:58,616 WARN L293 SmtUtils]: Spent 10.35s on a formula simplification that was a NOOP. DAG size: 107 (called from [L 279] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2023-12-02 14:40:18,568 WARN L293 SmtUtils]: Spent 19.95s on a formula simplification that was a NOOP. DAG size: 105 (called from [L 302] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2023-12-02 14:40:39,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:40:39,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492038385] [2023-12-02 14:40:39,461 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 14:40:39,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1673466881] [2023-12-02 14:40:39,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1673466881] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:40:39,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [31694393] [2023-12-02 14:40:39,464 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-12-02 14:40:39,464 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:40:39,464 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$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:40:39,464 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:40:39,464 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2023-12-02 14:40:39,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733976124] [2023-12-02 14:40:39,464 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 14:40:39,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 14:40:39,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:40:39,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 14:40:39,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=429, Unknown=12, NotChecked=0, Total=506 [2023-12-02 14:40:39,466 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 16 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 14:40:43,765 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:40:46,354 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.18s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:40:48,897 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2023-12-02 14:40:51,015 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:40:53,064 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:41:13,236 WARN L293 SmtUtils]: Spent 13.38s on a formula simplification that was a NOOP. DAG size: 79 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:41:16,101 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.37s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:41:19,082 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.98s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:41:21,218 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:41:23,245 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:41:25,278 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:41:28,427 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:41:30,521 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:41:30,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:41:30,579 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2023-12-02 14:41:30,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 14:41:30,579 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 30 [2023-12-02 14:41:30,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:41:30,580 INFO L225 Difference]: With dead ends: 75 [2023-12-02 14:41:30,580 INFO L226 Difference]: Without dead ends: 71 [2023-12-02 14:41:30,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 51.5s TimeCoverageRelationStatistics Valid=134, Invalid=844, Unknown=14, NotChecked=0, Total=992 [2023-12-02 14:41:30,582 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 20 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 9 mSolverCounterUnsat, 13 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 13 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 28.5s IncrementalHoareTripleChecker+Time [2023-12-02 14:41:30,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 54 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 271 Invalid, 13 Unknown, 0 Unchecked, 28.5s Time] [2023-12-02 14:41:30,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2023-12-02 14:41:30,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2023-12-02 14:41:30,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 48 states have internal predecessors, (50), 12 states have call successors, (12), 10 states have call predecessors, (12), 12 states have return successors, (17), 12 states have call predecessors, (17), 10 states have call successors, (17) [2023-12-02 14:41:30,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 79 transitions. [2023-12-02 14:41:30,599 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 79 transitions. Word has length 30 [2023-12-02 14:41:30,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:41:30,599 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 79 transitions. [2023-12-02 14:41:30,599 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 14:41:30,599 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 79 transitions. [2023-12-02 14:41:30,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-12-02 14:41:30,601 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:41:30,601 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:41:30,606 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:41:30,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:41:30,801 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:41:30,802 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:41:30,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1690772632, now seen corresponding path program 1 times [2023-12-02 14:41:30,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:41:30,802 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777950738] [2023-12-02 14:41:30,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:41:30,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:41:30,818 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:41:30,819 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [738961992] [2023-12-02 14:41:30,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:41:30,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:41:30,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:41:30,820 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:41:30,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c906cbc4-9be1-40c5-a3a7-cf8b83f86767/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:41:31,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:41:31,132 INFO L262 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 107 conjunts are in the unsatisfiable core [2023-12-02 14:41:31,137 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:41:45,331 WARN L293 SmtUtils]: Spent 14.16s on a formula simplification. DAG size of input: 331 DAG size of output: 166 (called from [L 346] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2023-12-02 14:41:45,332 INFO L349 Elim1Store]: treesize reduction 1434, result has 28.5 percent of original size [2023-12-02 14:41:45,332 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 15 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 18 new quantified variables, introduced 78 case distinctions, treesize of input 6966 treesize of output 5592 [2023-12-02 14:41:46,424 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 36 [2023-12-02 14:44:52,919 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:44:52,925 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:50:43,468 WARN L293 SmtUtils]: Spent 5.84m on a formula simplification. DAG size of input: 325 DAG size of output: 158 (called from [L 346] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2023-12-02 14:50:43,468 INFO L349 Elim1Store]: treesize reduction 995, result has 28.0 percent of original size [2023-12-02 14:50:43,506 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 12 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 14 new quantified variables, introduced 78 case distinctions, treesize of input 258070 treesize of output 219177