./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursified_nla-digbench/recursified_fermat1-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/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_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursified_nla-digbench/recursified_fermat1-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/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_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/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 82b98e74657ce84706a43470df686c21fc227d1db1df507636ad5f146dee0144 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:16:13,608 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:16:13,677 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 14:16:13,682 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:16:13,683 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:16:13,709 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:16:13,710 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:16:13,710 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:16:13,711 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:16:13,712 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:16:13,712 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:16:13,713 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:16:13,713 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:16:13,714 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:16:13,714 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:16:13,715 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:16:13,715 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:16:13,716 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:16:13,716 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:16:13,717 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:16:13,718 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:16:13,718 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:16:13,719 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:16:13,720 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:16:13,720 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 14:16:13,721 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:16:13,721 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 14:16:13,721 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:16:13,722 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:16:13,722 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:16:13,723 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:16:13,723 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 14:16:13,723 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:16:13,724 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:16:13,724 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:16:13,724 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:16:13,725 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:16:13,725 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:16:13,725 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:16:13,725 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:16:13,726 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:16:13,726 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:16:13,726 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:16:13,726 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:16:13,727 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:16:13,727 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:16:13,727 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:16:13,727 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_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 82b98e74657ce84706a43470df686c21fc227d1db1df507636ad5f146dee0144 [2023-12-02 14:16:13,964 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:16:13,983 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:16:13,986 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:16:13,988 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:16:13,988 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:16:13,989 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/recursified_nla-digbench/recursified_fermat1-ll.c [2023-12-02 14:16:16,746 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:16:16,906 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:16:16,907 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/sv-benchmarks/c/recursified_nla-digbench/recursified_fermat1-ll.c [2023-12-02 14:16:16,915 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/data/5247ea5e4/9fe6703b30df43a7b9e18c9c963b3bff/FLAG9d29526d5 [2023-12-02 14:16:16,930 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/data/5247ea5e4/9fe6703b30df43a7b9e18c9c963b3bff [2023-12-02 14:16:16,933 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:16:16,934 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:16:16,935 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:16:16,936 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:16:16,941 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:16:16,941 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:16:16" (1/1) ... [2023-12-02 14:16:16,943 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f8cfd5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:16, skipping insertion in model container [2023-12-02 14:16:16,943 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:16:16" (1/1) ... [2023-12-02 14:16:16,969 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:16:17,112 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_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/sv-benchmarks/c/recursified_nla-digbench/recursified_fermat1-ll.c[1101,1114] [2023-12-02 14:16:17,139 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:16:17,149 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:16:17,159 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_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/sv-benchmarks/c/recursified_nla-digbench/recursified_fermat1-ll.c[1101,1114] [2023-12-02 14:16:17,178 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:16:17,193 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:16:17,193 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17 WrapperNode [2023-12-02 14:16:17,193 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:16:17,194 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:16:17,194 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:16:17,194 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:16:17,200 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,208 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,229 INFO L138 Inliner]: procedures = 18, calls = 82, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2023-12-02 14:16:17,230 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:16:17,230 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:16:17,230 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:16:17,231 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:16:17,238 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,238 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,242 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,242 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,250 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,253 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,255 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,256 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,260 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:16:17,261 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:16:17,261 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:16:17,261 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:16:17,262 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (1/1) ... [2023-12-02 14:16:17,268 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:16:17,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:16:17,290 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:16:17,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:16:17,321 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:16:17,321 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_33_to_36_0 [2023-12-02 14:16:17,321 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_33_to_36_0 [2023-12-02 14:16:17,321 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-02 14:16:17,321 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-02 14:16:17,321 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:16:17,322 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 14:16:17,322 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 14:16:17,322 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_38_to_43_0 [2023-12-02 14:16:17,322 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_38_to_43_0 [2023-12-02 14:16:17,322 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_46_to_51_0 [2023-12-02 14:16:17,322 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_46_to_51_0 [2023-12-02 14:16:17,322 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:16:17,323 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:16:17,323 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 14:16:17,323 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 14:16:17,323 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 14:16:17,323 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 14:16:17,410 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:16:17,412 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:16:17,641 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:16:17,670 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:16:17,670 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-12-02 14:16:17,672 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:16:17 BoogieIcfgContainer [2023-12-02 14:16:17,672 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:16:17,675 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:16:17,675 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:16:17,678 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:16:17,679 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:16:16" (1/3) ... [2023-12-02 14:16:17,679 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7da4afcf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:16:17, skipping insertion in model container [2023-12-02 14:16:17,679 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:16:17" (2/3) ... [2023-12-02 14:16:17,680 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7da4afcf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:16:17, skipping insertion in model container [2023-12-02 14:16:17,680 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:16:17" (3/3) ... [2023-12-02 14:16:17,681 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_fermat1-ll.c [2023-12-02 14:16:17,701 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:16:17,701 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 14:16:17,742 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:16:17,748 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;@1a436bf, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:16:17,748 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 14:16:17,751 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 25 states have (on average 1.32) internal successors, (33), 29 states have internal predecessors, (33), 12 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-12-02 14:16:17,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-12-02 14:16:17,758 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:16:17,758 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:16:17,759 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:16:17,762 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:16:17,762 INFO L85 PathProgramCache]: Analyzing trace with hash 1940751987, now seen corresponding path program 1 times [2023-12-02 14:16:17,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:16:17,770 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421526877] [2023-12-02 14:16:17,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:16:17,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:16:17,889 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:16:17,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [643827237] [2023-12-02 14:16:17,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:16:17,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:16:17,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:16:17,894 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:16:17,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:16:18,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:16:18,162 WARN L260 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 85 conjunts are in the unsatisfiable core [2023-12-02 14:16:18,176 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:16:18,296 INFO L349 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2023-12-02 14:16:18,297 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 14:16:18,334 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:16:18,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:16:18,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:16:18,542 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 37 [2023-12-02 14:16:19,155 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 85 treesize of output 41 [2023-12-02 14:16:19,313 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:16:19,314 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:16:19,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:16:19,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421526877] [2023-12-02 14:16:19,314 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 14:16:19,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [643827237] [2023-12-02 14:16:19,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [643827237] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:16:19,315 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:16:19,316 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-12-02 14:16:19,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562338460] [2023-12-02 14:16:19,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:16:19,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 14:16:19,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:16:19,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 14:16:19,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:16:19,353 INFO L87 Difference]: Start difference. First operand has 44 states, 25 states have (on average 1.32) internal successors, (33), 29 states have internal predecessors, (33), 12 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:16:20,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:16:20,623 INFO L93 Difference]: Finished difference Result 95 states and 137 transitions. [2023-12-02 14:16:20,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 14:16:20,626 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 16 [2023-12-02 14:16:20,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:16:20,633 INFO L225 Difference]: With dead ends: 95 [2023-12-02 14:16:20,634 INFO L226 Difference]: Without dead ends: 56 [2023-12-02 14:16:20,637 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:16:20,640 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 18 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 14:16:20,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 278 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 14:16:20,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-12-02 14:16:20,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2023-12-02 14:16:20,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 32 states have (on average 1.15625) internal successors, (37), 36 states have internal predecessors, (37), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2023-12-02 14:16:20,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2023-12-02 14:16:20,684 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 16 [2023-12-02 14:16:20,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:16:20,685 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2023-12-02 14:16:20,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:16:20,685 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2023-12-02 14:16:20,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 14:16:20,687 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:16:20,687 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:16:20,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:16:20,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-12-02 14:16:20,891 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:16:20,892 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:16:20,892 INFO L85 PathProgramCache]: Analyzing trace with hash -971249846, now seen corresponding path program 1 times [2023-12-02 14:16:20,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:16:20,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9439653] [2023-12-02 14:16:20,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:16:20,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:16:20,928 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:16:20,928 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1906959426] [2023-12-02 14:16:20,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:16:20,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:16:20,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:16:20,930 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:16:20,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:16:21,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:16:21,065 WARN L260 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 142 conjunts are in the unsatisfiable core [2023-12-02 14:16:21,072 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:16:21,095 INFO L349 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2023-12-02 14:16:21,096 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 14:16:21,120 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:16:21,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:16:21,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:16:21,275 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 37 [2023-12-02 14:16:26,721 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 85 treesize of output 41 [2023-12-02 14:16:26,859 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:16:26,859 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:16:30,423 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:16:30,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:16:30,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9439653] [2023-12-02 14:16:30,424 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 14:16:30,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906959426] [2023-12-02 14:16:30,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906959426] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:16:30,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1898888018] [2023-12-02 14:16:30,444 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 14:16:30,445 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:16:30,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:16:30,454 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:16:30,454 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:16:31,203 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 172 for LOIs [2023-12-02 14:16:31,290 INFO L197 IcfgInterpreter]: Interpreting procedure func_to_recursive_line_33_to_36_0 with input of size 122 for LOIs [2023-12-02 14:16:31,988 INFO L197 IcfgInterpreter]: Interpreting procedure func_to_recursive_line_38_to_43_0 with input of size 141 for LOIs [2023-12-02 14:16:32,252 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 230 for LOIs [2023-12-02 14:16:33,294 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:17:28,001 WARN L293 SmtUtils]: Spent 5.57s on a formula simplification. DAG size of input: 232 DAG size of output: 159 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:18:28,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1898888018] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:18:28,769 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:18:28,769 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [15, 11] total 42 [2023-12-02 14:18:28,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428375510] [2023-12-02 14:18:28,770 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:18:28,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 14:18:28,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:18:28,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 14:18:28,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1524, Unknown=17, NotChecked=0, Total=1722 [2023-12-02 14:18:28,773 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 20 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 13 states have internal predecessors, (15), 6 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 14:18:31,988 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 14:18:35,812 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:18:37,307 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.37s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:18:50,962 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:19:05,065 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.72s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:19:10,657 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.75s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:19:18,730 WARN L539 Checker$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 14:19:18,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:18,748 INFO L93 Difference]: Finished difference Result 70 states and 83 transitions. [2023-12-02 14:19:18,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-12-02 14:19:18,749 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 13 states have internal predecessors, (15), 6 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2023-12-02 14:19:18,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:18,750 INFO L225 Difference]: With dead ends: 70 [2023-12-02 14:19:18,751 INFO L226 Difference]: Without dead ends: 68 [2023-12-02 14:19:18,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 121.0s TimeCoverageRelationStatistics Valid=181, Invalid=1524, Unknown=17, NotChecked=0, Total=1722 [2023-12-02 14:19:18,753 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 10 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 494 mSolverCounterSat, 4 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 49.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 494 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 49.9s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:18,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 223 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 494 Invalid, 6 Unknown, 0 Unchecked, 49.9s Time] [2023-12-02 14:19:18,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-12-02 14:19:18,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 65. [2023-12-02 14:19:18,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 40 states have (on average 1.15) internal successors, (46), 45 states have internal predecessors, (46), 15 states have call successors, (15), 9 states have call predecessors, (15), 9 states have return successors, (16), 13 states have call predecessors, (16), 14 states have call successors, (16) [2023-12-02 14:19:18,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 77 transitions. [2023-12-02 14:19:18,775 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 77 transitions. Word has length 26 [2023-12-02 14:19:18,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:18,776 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 77 transitions. [2023-12-02 14:19:18,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 13 states have internal predecessors, (15), 6 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 14:19:18,776 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 77 transitions. [2023-12-02 14:19:18,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 14:19:18,777 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:18,777 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:18,782 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:19:18,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:18,978 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:19:18,978 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:18,978 INFO L85 PathProgramCache]: Analyzing trace with hash -169293736, now seen corresponding path program 1 times [2023-12-02 14:19:18,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:18,979 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616056348] [2023-12-02 14:19:18,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:18,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:18,995 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:19:18,995 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1057306264] [2023-12-02 14:19:18,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:18,995 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:18,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:18,996 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:18,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:19:19,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:19,095 WARN L260 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 113 conjunts are in the unsatisfiable core [2023-12-02 14:19:19,100 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:19,117 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:19:19,125 INFO L349 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2023-12-02 14:19:19,125 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 14:19:19,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:19:19,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:19:19,294 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 37 [2023-12-02 14:19:20,384 INFO L349 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2023-12-02 14:19:20,385 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 79 treesize of output 51 [2023-12-02 14:19:20,528 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 14:19:20,528 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:22,471 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:19:22,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:22,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616056348] [2023-12-02 14:19:22,472 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 14:19:22,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057306264] [2023-12-02 14:19:22,472 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057306264] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:22,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [265990766] [2023-12-02 14:19:22,475 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 14:19:22,475 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:22,475 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:19:22,475 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:19:22,475 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:19:23,228 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 172 for LOIs [2023-12-02 14:19:23,309 INFO L197 IcfgInterpreter]: Interpreting procedure func_to_recursive_line_33_to_36_0 with input of size 122 for LOIs [2023-12-02 14:19:23,999 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 202 for LOIs [2023-12-02 14:19:24,427 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:20:02,531 WARN L293 SmtUtils]: Spent 5.54s on a formula simplification. DAG size of input: 204 DAG size of output: 165 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:20:33,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [265990766] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:20:33,494 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:20:33,494 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [17, 13] total 44 [2023-12-02 14:20:33,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802027766] [2023-12-02 14:20:33,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:20:33,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 14:20:33,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:20:33,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 14:20:33,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1695, Unknown=9, NotChecked=0, Total=1892 [2023-12-02 14:20:33,498 INFO L87 Difference]: Start difference. First operand 65 states and 77 transitions. Second operand has 19 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 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 14:20:40,347 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:20:45,265 WARN L539 Checker$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 14:20:52,749 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:20:57,542 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-12-02 14:21:17,928 WARN L293 SmtUtils]: Spent 7.60s on a formula simplification. DAG size of input: 130 DAG size of output: 116 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:21:34,434 WARN L293 SmtUtils]: Spent 8.95s on a formula simplification. DAG size of input: 144 DAG size of output: 136 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:21:39,281 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 14:21:39,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:21:39,393 INFO L93 Difference]: Finished difference Result 73 states and 84 transitions. [2023-12-02 14:21:39,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-12-02 14:21:39,394 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 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 26 [2023-12-02 14:21:39,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:21:39,396 INFO L225 Difference]: With dead ends: 73 [2023-12-02 14:21:39,396 INFO L226 Difference]: Without dead ends: 63 [2023-12-02 14:21:39,397 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 631 ImplicationChecksByTransitivity, 105.3s TimeCoverageRelationStatistics Valid=208, Invalid=1850, Unknown=12, NotChecked=0, Total=2070 [2023-12-02 14:21:39,398 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 5 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 473 mSolverCounterSat, 3 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 31.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 339 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 473 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.5s IncrementalHoareTripleChecker+Time [2023-12-02 14:21:39,398 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 339 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 473 Invalid, 5 Unknown, 0 Unchecked, 31.5s Time] [2023-12-02 14:21:39,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-12-02 14:21:39,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2023-12-02 14:21:39,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 43 states have internal predecessors, (44), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (15), 13 states have call predecessors, (15), 14 states have call successors, (15) [2023-12-02 14:21:39,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2023-12-02 14:21:39,420 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 26 [2023-12-02 14:21:39,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:21:39,421 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2023-12-02 14:21:39,421 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 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 14:21:39,421 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2023-12-02 14:21:39,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-12-02 14:21:39,422 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:21:39,422 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:21:39,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:21:39,623 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:21:39,623 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:21:39,624 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:21:39,624 INFO L85 PathProgramCache]: Analyzing trace with hash 1614725153, now seen corresponding path program 1 times [2023-12-02 14:21:39,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:21:39,624 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464961093] [2023-12-02 14:21:39,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:21:39,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:21:39,645 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 14:21:39,646 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1497023627] [2023-12-02 14:21:39,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:21:39,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:21:39,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:21:39,647 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:21:39,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d2714c0-7637-4aed-8c0f-3f80bb301b5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:21:39,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:21:39,809 WARN L260 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 177 conjunts are in the unsatisfiable core [2023-12-02 14:21:39,816 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:21:39,827 INFO L349 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2023-12-02 14:21:39,827 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 14:21:40,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:21:40,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:21:40,005 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 37 [2023-12-02 14:21:44,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:21:44,954 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 95 treesize of output 58 [2023-12-02 14:21:45,342 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 86 treesize of output 42 [2023-12-02 14:21:45,486 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 14:21:45,486 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:23:06,018 WARN L293 SmtUtils]: Spent 1.03m on a formula simplification. DAG size of input: 248 DAG size of output: 155 (called from [L 346] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2023-12-02 14:23:06,018 INFO L349 Elim1Store]: treesize reduction 690, result has 38.4 percent of original size [2023-12-02 14:23:06,019 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 6 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 40219 treesize of output 28533 [2023-12-02 14:23:09,405 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:23:09,542 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:23:09,655 INFO L224 Elim1Store]: Index analysis took 577 ms [2023-12-02 14:23:47,352 WARN L293 SmtUtils]: Spent 37.54s on a formula simplification. DAG size of input: 251 DAG size of output: 56 (called from [L 346] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2023-12-02 14:23:47,352 INFO L349 Elim1Store]: treesize reduction 741, result has 10.8 percent of original size [2023-12-02 14:23:47,355 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 9 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 8 new quantified variables, introduced 40 case distinctions, treesize of input 366538 treesize of output 350555 [2023-12-02 14:23:51,544 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:23:52,188 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:23:53,138 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:23:53,722 INFO L224 Elim1Store]: Index analysis took 2398 ms [2023-12-02 14:24:57,290 WARN L293 SmtUtils]: Spent 1.05m on a formula simplification. DAG size of input: 342 DAG size of output: 86 (called from [L 346] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2023-12-02 14:24:57,290 INFO L349 Elim1Store]: treesize reduction 1154, result has 11.7 percent of original size [2023-12-02 14:24:57,292 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 12 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 9 new quantified variables, introduced 60 case distinctions, treesize of input 23925 treesize of output 23715 [2023-12-02 14:26:55,502 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:26:55,502 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 81 treesize of output 69 [2023-12-02 14:26:55,811 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:26:55,811 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 81 treesize of output 69 [2023-12-02 14:26:56,185 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:26:56,185 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 81 treesize of output 69 [2023-12-02 14:26:56,712 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:26:56,712 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 81 treesize of output 69