./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_2+newton_2_1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 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_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_2+newton_2_1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2f8505e46ba1dfd9d1ec3a293aaba2f619b40b1a80d91e8d871194a57c70c939 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:40:11,520 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:40:11,586 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:40:11,592 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:40:11,592 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:40:11,616 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:40:11,620 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:40:11,621 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:40:11,622 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:40:11,627 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:40:11,628 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:40:11,629 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:40:11,630 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:40:11,631 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:40:11,632 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:40:11,632 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:40:11,633 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:40:11,633 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:40:11,633 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:40:11,634 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:40:11,634 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:40:11,635 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:40:11,636 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:40:11,636 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:40:11,637 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:40:11,637 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:40:11,638 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:40:11,638 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:40:11,638 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:40:11,639 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:40:11,640 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:40:11,640 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:40:11,641 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:40:11,641 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:40:11,641 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:40:11,641 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:40:11,642 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:40:11,642 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:40:11,642 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:40:11,643 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:40:11,643 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:40:11,644 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:40:11,644 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:40:11,644 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:40:11,645 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:40:11,645 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:40:11,645 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:40:11,645 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_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2f8505e46ba1dfd9d1ec3a293aaba2f619b40b1a80d91e8d871194a57c70c939 [2023-11-23 20:40:11,927 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:40:11,959 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:40:11,961 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:40:11,964 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:40:11,965 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:40:11,966 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/gcd_2+newton_2_1.i [2023-11-23 20:40:15,023 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:40:15,282 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:40:15,283 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/sv-benchmarks/c/combinations/gcd_2+newton_2_1.i [2023-11-23 20:40:15,293 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/data/06853f9e1/a09a1ac6183c40518eec13f270452e57/FLAGd09e6836f [2023-11-23 20:40:15,313 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/data/06853f9e1/a09a1ac6183c40518eec13f270452e57 [2023-11-23 20:40:15,320 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:40:15,321 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:40:15,327 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:40:15,327 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:40:15,333 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:40:15,337 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,339 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7b788a26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15, skipping insertion in model container [2023-11-23 20:40:15,339 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,373 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:40:15,572 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_d2016505-7000-40e9-abde-cec38acc2969/sv-benchmarks/c/combinations/gcd_2+newton_2_1.i[1226,1239] [2023-11-23 20:40:15,625 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_d2016505-7000-40e9-abde-cec38acc2969/sv-benchmarks/c/combinations/gcd_2+newton_2_1.i[2841,2854] [2023-11-23 20:40:15,628 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:40:15,643 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:40:15,667 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_d2016505-7000-40e9-abde-cec38acc2969/sv-benchmarks/c/combinations/gcd_2+newton_2_1.i[1226,1239] [2023-11-23 20:40:15,679 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_d2016505-7000-40e9-abde-cec38acc2969/sv-benchmarks/c/combinations/gcd_2+newton_2_1.i[2841,2854] [2023-11-23 20:40:15,680 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:40:15,696 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:40:15,697 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15 WrapperNode [2023-11-23 20:40:15,697 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:40:15,698 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:40:15,698 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:40:15,699 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:40:15,707 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,715 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,741 INFO L138 Inliner]: procedures = 27, calls = 24, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 88 [2023-11-23 20:40:15,741 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:40:15,742 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:40:15,742 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:40:15,743 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:40:15,753 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,753 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,755 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,756 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,763 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,766 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,768 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,770 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,772 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:40:15,773 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:40:15,773 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:40:15,774 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:40:15,775 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:40:15,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:15,807 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:40:15,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:40:15,840 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:40:15,840 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2023-11-23 20:40:15,840 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2023-11-23 20:40:15,841 INFO L130 BoogieDeclarations]: Found specification of procedure f [2023-11-23 20:40:15,841 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2023-11-23 20:40:15,841 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:40:15,841 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:40:15,841 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:40:15,918 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:40:15,920 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:40:16,129 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:40:16,210 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:40:16,210 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-23 20:40:16,215 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:40:16 BoogieIcfgContainer [2023-11-23 20:40:16,216 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:40:16,219 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:40:16,221 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:40:16,225 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:40:16,225 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:40:15" (1/3) ... [2023-11-23 20:40:16,226 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55e270d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:40:16, skipping insertion in model container [2023-11-23 20:40:16,228 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (2/3) ... [2023-11-23 20:40:16,229 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55e270d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:40:16, skipping insertion in model container [2023-11-23 20:40:16,229 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:40:16" (3/3) ... [2023-11-23 20:40:16,231 INFO L112 eAbstractionObserver]: Analyzing ICFG gcd_2+newton_2_1.i [2023-11-23 20:40:16,253 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:40:16,253 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 20:40:16,311 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:40:16,319 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;@4d61034f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:40:16,319 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 20:40:16,323 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 20:40:16,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 20:40:16,332 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:16,333 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 20:40:16,333 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:16,339 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:16,340 INFO L85 PathProgramCache]: Analyzing trace with hash -584909265, now seen corresponding path program 1 times [2023-11-23 20:40:16,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:16,351 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997772431] [2023-11-23 20:40:16,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:16,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:16,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:16,762 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:40:16,763 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:16,763 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997772431] [2023-11-23 20:40:16,764 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997772431] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:16,765 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:16,765 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:40:16,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005834301] [2023-11-23 20:40:16,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:16,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:40:16,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:16,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:40:16,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:40:16,810 INFO L87 Difference]: Start difference. First operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:40:16,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:16,886 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2023-11-23 20:40:16,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:40:16,889 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 20:40:16,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:16,896 INFO L225 Difference]: With dead ends: 36 [2023-11-23 20:40:16,897 INFO L226 Difference]: Without dead ends: 21 [2023-11-23 20:40:16,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:40:16,904 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 1 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:16,905 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 52 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:40:16,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-23 20:40:16,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-23 20:40:16,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 20:40:16,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2023-11-23 20:40:16,949 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2023-11-23 20:40:16,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:16,950 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2023-11-23 20:40:16,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:40:16,951 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2023-11-23 20:40:16,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 20:40:16,952 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:16,952 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:16,953 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:40:16,953 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:16,954 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:16,954 INFO L85 PathProgramCache]: Analyzing trace with hash -1018725074, now seen corresponding path program 1 times [2023-11-23 20:40:16,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:16,955 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945895017] [2023-11-23 20:40:16,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:16,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:16,976 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:40:16,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1608731965] [2023-11-23 20:40:16,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:16,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:16,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:16,980 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:17,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:40:17,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:17,073 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-23 20:40:17,079 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:17,521 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:40:17,522 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:40:17,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:40:17,673 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:17,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945895017] [2023-11-23 20:40:17,674 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 20:40:17,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608731965] [2023-11-23 20:40:17,679 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608731965] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:40:17,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [540256322] [2023-11-23 20:40:17,721 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 20:40:17,721 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:40:17,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:40:17,732 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:40:17,732 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:40:19,756 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:40:20,076 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '150#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main1_~x~0#1| 127) (<= (+ |ULTIMATE.start_main1_~y~0#1| 1) |ULTIMATE.start_main1_~g~0#1|) (<= 1 |ULTIMATE.start_main1_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (<= |ULTIMATE.start_gcd_test_#res#1| 127) (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 20:40:20,076 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:40:20,077 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:40:20,077 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2023-11-23 20:40:20,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373028675] [2023-11-23 20:40:20,078 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:40:20,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 20:40:20,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:20,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 20:40:20,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-11-23 20:40:20,081 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:40:20,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:20,348 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2023-11-23 20:40:20,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 20:40:20,349 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-23 20:40:20,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:20,350 INFO L225 Difference]: With dead ends: 28 [2023-11-23 20:40:20,350 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 20:40:20,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2023-11-23 20:40:20,353 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 3 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:20,353 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 83 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:40:20,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 20:40:20,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-23 20:40:20,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 20:40:20,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2023-11-23 20:40:20,361 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 7 [2023-11-23 20:40:20,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:20,361 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2023-11-23 20:40:20,362 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:40:20,362 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2023-11-23 20:40:20,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 20:40:20,363 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:20,363 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:20,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:20,584 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:20,584 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:20,585 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:20,585 INFO L85 PathProgramCache]: Analyzing trace with hash -1867278002, now seen corresponding path program 2 times [2023-11-23 20:40:20,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:20,585 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258743961] [2023-11-23 20:40:20,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:20,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:20,602 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:40:20,603 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1243839139] [2023-11-23 20:40:20,603 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:40:20,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:20,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:20,604 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:20,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2016505-7000-40e9-abde-cec38acc2969/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:40:20,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 20:40:20,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:40:20,714 INFO L262 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 35 conjunts are in the unsatisfiable core [2023-11-23 20:40:20,715 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:31,953 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:40:31,953 INFO L327 TraceCheckSpWp]: Computing backward predicates...