./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_3+newton_3_7.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/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_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_3+newton_3_7.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/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_b4ef5748-1284-471f-9b91-7bff7b54d391/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 f5a5fcfdef398824c80e5dd00ccb13245b1aba31a53b04be2e0e92d8a739e53d --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 20:08:58,269 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 20:08:58,340 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 20:08:58,345 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 20:08:58,345 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 20:08:58,376 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 20:08:58,377 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 20:08:58,378 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 20:08:58,378 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 20:08:58,379 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 20:08:58,379 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 20:08:58,380 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 20:08:58,380 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 20:08:58,381 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 20:08:58,381 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 20:08:58,382 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 20:08:58,382 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 20:08:58,383 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 20:08:58,383 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 20:08:58,384 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 20:08:58,384 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 20:08:58,385 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 20:08:58,386 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 20:08:58,386 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 20:08:58,387 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 20:08:58,387 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 20:08:58,387 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 20:08:58,388 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 20:08:58,388 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 20:08:58,397 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 20:08:58,398 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 20:08:58,398 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 20:08:58,398 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 20:08:58,399 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 20:08:58,399 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 20:08:58,400 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 20:08:58,400 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 20:08:58,400 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 20:08:58,400 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 20:08:58,401 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 20:08:58,401 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 20:08:58,401 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 20:08:58,401 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 20:08:58,401 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 20:08:58,402 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 20:08:58,402 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 20:08:58,402 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 20:08:58,402 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_b4ef5748-1284-471f-9b91-7bff7b54d391/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f5a5fcfdef398824c80e5dd00ccb13245b1aba31a53b04be2e0e92d8a739e53d [2023-12-02 20:08:58,614 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 20:08:58,636 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 20:08:58,639 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 20:08:58,640 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 20:08:58,641 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 20:08:58,642 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/combinations/gcd_3+newton_3_7.i [2023-12-02 20:09:01,357 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 20:09:01,564 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 20:09:01,565 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/sv-benchmarks/c/combinations/gcd_3+newton_3_7.i [2023-12-02 20:09:01,573 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/data/fae000321/9ad08ccd775044ac9da5c00913f0f28f/FLAG7e059eb5a [2023-12-02 20:09:01,588 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/data/fae000321/9ad08ccd775044ac9da5c00913f0f28f [2023-12-02 20:09:01,591 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 20:09:01,592 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 20:09:01,594 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 20:09:01,594 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 20:09:01,599 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 20:09:01,600 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,601 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3dc1c080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01, skipping insertion in model container [2023-12-02 20:09:01,601 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,627 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 20:09:01,784 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_b4ef5748-1284-471f-9b91-7bff7b54d391/sv-benchmarks/c/combinations/gcd_3+newton_3_7.i[1226,1239] [2023-12-02 20:09:01,810 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_b4ef5748-1284-471f-9b91-7bff7b54d391/sv-benchmarks/c/combinations/gcd_3+newton_3_7.i[2862,2875] [2023-12-02 20:09:01,812 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 20:09:01,822 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 20:09:01,836 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_b4ef5748-1284-471f-9b91-7bff7b54d391/sv-benchmarks/c/combinations/gcd_3+newton_3_7.i[1226,1239] [2023-12-02 20:09:01,846 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_b4ef5748-1284-471f-9b91-7bff7b54d391/sv-benchmarks/c/combinations/gcd_3+newton_3_7.i[2862,2875] [2023-12-02 20:09:01,847 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 20:09:01,863 INFO L206 MainTranslator]: Completed translation [2023-12-02 20:09:01,864 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01 WrapperNode [2023-12-02 20:09:01,864 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 20:09:01,865 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 20:09:01,865 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 20:09:01,865 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 20:09:01,874 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,883 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,906 INFO L138 Inliner]: procedures = 27, calls = 26, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 93 [2023-12-02 20:09:01,906 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 20:09:01,907 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 20:09:01,907 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 20:09:01,907 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 20:09:01,916 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,916 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,919 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,919 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,924 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,928 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,929 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,931 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,933 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 20:09:01,934 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 20:09:01,935 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 20:09:01,935 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 20:09:01,935 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (1/1) ... [2023-12-02 20:09:01,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 20:09:01,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:09:01,964 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 20:09:01,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 20:09:02,001 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 20:09:02,002 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2023-12-02 20:09:02,002 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2023-12-02 20:09:02,002 INFO L130 BoogieDeclarations]: Found specification of procedure f [2023-12-02 20:09:02,002 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2023-12-02 20:09:02,002 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 20:09:02,002 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 20:09:02,003 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 20:09:02,084 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 20:09:02,086 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 20:09:02,295 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 20:09:02,352 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 20:09:02,352 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-12-02 20:09:02,354 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:09:02 BoogieIcfgContainer [2023-12-02 20:09:02,354 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 20:09:02,357 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 20:09:02,357 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 20:09:02,361 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 20:09:02,361 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 08:09:01" (1/3) ... [2023-12-02 20:09:02,362 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a81360e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:09:02, skipping insertion in model container [2023-12-02 20:09:02,362 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:01" (2/3) ... [2023-12-02 20:09:02,362 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a81360e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:09:02, skipping insertion in model container [2023-12-02 20:09:02,363 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:09:02" (3/3) ... [2023-12-02 20:09:02,365 INFO L112 eAbstractionObserver]: Analyzing ICFG gcd_3+newton_3_7.i [2023-12-02 20:09:02,384 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 20:09:02,384 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-12-02 20:09:02,430 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 20:09:02,435 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;@758a6c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 20:09:02,436 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-12-02 20:09:02,438 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 17 states have (on average 1.411764705882353) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 20:09:02,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 20:09:02,446 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:09:02,446 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 20:09:02,447 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 20:09:02,452 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:09:02,452 INFO L85 PathProgramCache]: Analyzing trace with hash -377832024, now seen corresponding path program 1 times [2023-12-02 20:09:02,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:09:02,461 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024508600] [2023-12-02 20:09:02,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:02,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:09:02,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:02,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:02,825 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:09:02,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024508600] [2023-12-02 20:09:02,826 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2024508600] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 20:09:02,826 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 20:09:02,826 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 20:09:02,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238587868] [2023-12-02 20:09:02,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 20:09:02,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 20:09:02,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:09:02,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 20:09:02,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 20:09:02,865 INFO L87 Difference]: Start difference. First operand has 28 states, 17 states have (on average 1.411764705882353) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 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) [2023-12-02 20:09:02,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:09:02,961 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2023-12-02 20:09:02,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 20:09:02,963 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 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 [2023-12-02 20:09:02,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:09:02,970 INFO L225 Difference]: With dead ends: 40 [2023-12-02 20:09:02,970 INFO L226 Difference]: Without dead ends: 24 [2023-12-02 20:09:02,973 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 20:09:02,977 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:09:02,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 83 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 20:09:02,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-12-02 20:09:03,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-12-02 20:09:03,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 20:09:03,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2023-12-02 20:09:03,015 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 6 [2023-12-02 20:09:03,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:09:03,015 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2023-12-02 20:09:03,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 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) [2023-12-02 20:09:03,016 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2023-12-02 20:09:03,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 20:09:03,017 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:09:03,017 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:09:03,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 20:09:03,018 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 20:09:03,018 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:09:03,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1099445991, now seen corresponding path program 1 times [2023-12-02 20:09:03,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:09:03,019 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788675172] [2023-12-02 20:09:03,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:03,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:09:03,033 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 20:09:03,033 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1248787320] [2023-12-02 20:09:03,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:03,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:09:03,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:09:03,036 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:09:03,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 20:09:03,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:03,114 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 20:09:03,119 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:09:10,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:10,035 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:09:11,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:09:11,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788675172] [2023-12-02 20:09:11,678 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 20:09:11,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248787320] [2023-12-02 20:09:11,678 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. No stderr output. [2023-12-02 20:09:11,679 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [268881796] [2023-12-02 20:09:11,697 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 139 [2023-12-02 20:09:11,702 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 20:09:11,703 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:09:11,706 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:09:11,711 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:09:11,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:09:11,742 FATAL L? ?]: Ignoring exception! de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:337) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:177) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.push(Scriptor.java:132) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.push(DiffWrapperScript.java:90) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.push(WrapperScript.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.push(HistoryRecordingScript.java:107) at de.uni_freiburg.informatik.ultimate.logic.Util.checkSat(Util.java:48) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.SmtUtils.checkSatTerm(SmtUtils.java:332) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.isFalse(SymbolicTools.java:223) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.RelationCheckUtil.isEqBottom_SolverAlphaSolver(RelationCheckUtil.java:56) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.ExplicitValueDomain.isEqBottom(ExplicitValueDomain.java:73) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.CompoundDomain.isEqBottom(CompoundDomain.java:84) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.StatsWrapperDomain.isEqBottom(StatsWrapperDomain.java:69) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.earlyExitAfterStep(DagInterpreter.java:139) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:125) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: java.io.IOException: Stream closed at java.base/java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:442) at java.base/java.io.OutputStream.write(OutputStream.java:157) at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81) at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142) at java.base/sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:318) at java.base/sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:153) at java.base/java.io.OutputStreamWriter.flush(OutputStreamWriter.java:251) at java.base/java.io.BufferedWriter.flush(BufferedWriter.java:257) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:175) ... 44 more [2023-12-02 20:09:11,744 INFO L185 FreeRefinementEngine]: Found 0 perfect and 0 imperfect interpolant sequences. [2023-12-02 20:09:11,744 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2023-12-02 20:09:11,744 ERROR L171 FreeRefinementEngine]: Strategy SIFA_TAIPAN failed to provide any proof altough trace is infeasible [2023-12-02 20:09:11,745 INFO L360 BasicCegarLoop]: Counterexample might be feasible [2023-12-02 20:09:11,751 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (1 of 2 remaining) [2023-12-02 20:09:11,753 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2023-12-02 20:09:11,758 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-12-02 20:09:11,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:09:11,960 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-12-02 20:09:11,963 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-12-02 20:09:11,978 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.12 08:09:11 BoogieIcfgContainer [2023-12-02 20:09:11,978 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-12-02 20:09:11,979 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2023-12-02 20:09:11,979 INFO L270 PluginConnector]: Initializing Witness Printer... [2023-12-02 20:09:11,979 INFO L274 PluginConnector]: Witness Printer initialized [2023-12-02 20:09:11,979 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:09:02" (3/4) ... [2023-12-02 20:09:11,981 INFO L140 WitnessPrinter]: No result that supports witness generation found [2023-12-02 20:09:11,982 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2023-12-02 20:09:11,983 INFO L158 Benchmark]: Toolchain (without parser) took 10390.79ms. Allocated memory was 161.5MB in the beginning and 195.0MB in the end (delta: 33.6MB). Free memory was 130.8MB in the beginning and 161.7MB in the end (delta: -30.8MB). Peak memory consumption was 2.7MB. Max. memory is 16.1GB. [2023-12-02 20:09:11,984 INFO L158 Benchmark]: CDTParser took 0.18ms. Allocated memory is still 123.7MB. Free memory is still 95.7MB. There was no memory consumed. Max. memory is 16.1GB. [2023-12-02 20:09:11,984 INFO L158 Benchmark]: CACSL2BoogieTranslator took 270.46ms. Allocated memory is still 161.5MB. Free memory was 130.1MB in the beginning and 118.8MB in the end (delta: 11.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-12-02 20:09:11,985 INFO L158 Benchmark]: Boogie Procedure Inliner took 41.11ms. Allocated memory is still 161.5MB. Free memory was 118.8MB in the beginning and 116.7MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-12-02 20:09:11,985 INFO L158 Benchmark]: Boogie Preprocessor took 26.76ms. Allocated memory is still 161.5MB. Free memory was 116.7MB in the beginning and 115.4MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-12-02 20:09:11,986 INFO L158 Benchmark]: RCFGBuilder took 419.96ms. Allocated memory is still 161.5MB. Free memory was 115.4MB in the beginning and 122.1MB in the end (delta: -6.7MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-12-02 20:09:11,986 INFO L158 Benchmark]: TraceAbstraction took 9621.04ms. Allocated memory was 161.5MB in the beginning and 195.0MB in the end (delta: 33.6MB). Free memory was 121.3MB in the beginning and 162.2MB in the end (delta: -40.9MB). There was no memory consumed. Max. memory is 16.1GB. [2023-12-02 20:09:11,987 INFO L158 Benchmark]: Witness Printer took 4.02ms. Allocated memory is still 195.0MB. Free memory is still 161.7MB. There was no memory consumed. Max. memory is 16.1GB. [2023-12-02 20:09:11,989 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18ms. Allocated memory is still 123.7MB. Free memory is still 95.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 270.46ms. Allocated memory is still 161.5MB. Free memory was 130.1MB in the beginning and 118.8MB in the end (delta: 11.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 41.11ms. Allocated memory is still 161.5MB. Free memory was 118.8MB in the beginning and 116.7MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 26.76ms. Allocated memory is still 161.5MB. Free memory was 116.7MB in the beginning and 115.4MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 419.96ms. Allocated memory is still 161.5MB. Free memory was 115.4MB in the beginning and 122.1MB in the end (delta: -6.7MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 9621.04ms. Allocated memory was 161.5MB in the beginning and 195.0MB in the end (delta: 33.6MB). Free memory was 121.3MB in the beginning and 162.2MB in the end (delta: -40.9MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 4.02ms. Allocated memory is still 195.0MB. Free memory is still 161.7MB. There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 27]: Unable to prove that a call to reach_error is unreachable Unable to prove that a call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L108] COND TRUE __VERIFIER_nondet_int() [L109] CALL main1() [L49] signed char x = __VERIFIER_nondet_char(); [L50] signed char y = __VERIFIER_nondet_char(); [L51] signed char g; [L53] CALL, EXPR gcd_test(x, y) [L33] signed char t; [L35] COND TRUE a < (signed char)0 [L35] a = -a [L36] COND FALSE !(b < (signed char)0) [L38] COND TRUE b != (signed char)0 [L39] t = b [L40] b = a % b [L41] a = t [L38] COND FALSE !(b != (signed char)0) [L43] return a; [L53] RET, EXPR gcd_test(x, y) [L53] g = gcd_test(x, y) [L55] COND TRUE x > (signed char)0 [L56] CALL __VERIFIER_assert(x >= g) [L26] COND TRUE !(cond) [L27] reach_error() - UnprovableResult [Line: 102]: Unable to prove that a call to reach_error is unreachable Unable to prove that a call to reach_error is unreachable Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 28 locations, 2 error locations. Started 1 CEGAR loops. OverallTime: 9.5s, OverallIterations: 2, TraceHistogramMax: 1, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 5 SdHoareTripleChecker+Valid, 0.1s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 5 mSDsluCounter, 83 SdHoareTripleChecker+Invalid, 0.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 62 mSDsCounter, 1 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 51 IncrementalHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 1 mSolverCounterUnsat, 21 mSDtfsCounter, 51 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=28occurred in iteration=0, InterpolantAutomatonStates: 6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 8.8s InterpolantComputationTime, 13 NumberOfCodeBlocks, 13 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 11 ConstructedInterpolants, 1 QuantifiedInterpolants, 376 SizeOfPredicates, 6 NumberOfNonLiveVariables, 73 ConjunctsInSsa, 23 ConjunctsInUnsatCore, 2 InterpolantComputations, 1 PerfectInterpolantSequences, 0/1 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/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_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_3+newton_3_7.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/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 f5a5fcfdef398824c80e5dd00ccb13245b1aba31a53b04be2e0e92d8a739e53d --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 20:09:13,736 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 20:09:13,802 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2023-12-02 20:09:13,807 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 20:09:13,808 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 20:09:13,836 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 20:09:13,837 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 20:09:13,837 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 20:09:13,838 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 20:09:13,838 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 20:09:13,839 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 20:09:13,839 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 20:09:13,840 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 20:09:13,840 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 20:09:13,841 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 20:09:13,841 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 20:09:13,842 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 20:09:13,843 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 20:09:13,843 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 20:09:13,844 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 20:09:13,844 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 20:09:13,849 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 20:09:13,850 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 20:09:13,850 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 20:09:13,850 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 20:09:13,851 INFO L153 SettingsManager]: * Use bitvectors instead of ints=true [2023-12-02 20:09:13,851 INFO L153 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2023-12-02 20:09:13,852 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 20:09:13,852 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 20:09:13,852 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 20:09:13,853 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 20:09:13,853 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-12-02 20:09:13,853 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 20:09:13,854 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 20:09:13,854 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 20:09:13,854 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 20:09:13,854 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 20:09:13,854 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 20:09:13,855 INFO L153 SettingsManager]: * Trace refinement strategy=WALRUS [2023-12-02 20:09:13,855 INFO L153 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2023-12-02 20:09:13,855 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 20:09:13,855 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 20:09:13,856 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 20:09:13,856 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 20:09:13,856 INFO L153 SettingsManager]: * Logic for external solver=AUFBV 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_b4ef5748-1284-471f-9b91-7bff7b54d391/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f5a5fcfdef398824c80e5dd00ccb13245b1aba31a53b04be2e0e92d8a739e53d [2023-12-02 20:09:14,139 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 20:09:14,159 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 20:09:14,162 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 20:09:14,162 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 20:09:14,163 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 20:09:14,164 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/combinations/gcd_3+newton_3_7.i [2023-12-02 20:09:17,020 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 20:09:17,206 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 20:09:17,206 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/sv-benchmarks/c/combinations/gcd_3+newton_3_7.i [2023-12-02 20:09:17,215 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/data/914dee64d/91b85a354ff7404789fe0e2b795e7187/FLAGf3aa4e473 [2023-12-02 20:09:17,227 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/data/914dee64d/91b85a354ff7404789fe0e2b795e7187 [2023-12-02 20:09:17,229 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 20:09:17,231 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 20:09:17,232 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 20:09:17,232 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 20:09:17,236 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 20:09:17,237 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,238 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74edf180 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17, skipping insertion in model container [2023-12-02 20:09:17,238 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,262 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 20:09:17,393 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_b4ef5748-1284-471f-9b91-7bff7b54d391/sv-benchmarks/c/combinations/gcd_3+newton_3_7.i[1226,1239] [2023-12-02 20:09:17,419 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_b4ef5748-1284-471f-9b91-7bff7b54d391/sv-benchmarks/c/combinations/gcd_3+newton_3_7.i[2862,2875] [2023-12-02 20:09:17,421 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 20:09:17,435 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 20:09:17,448 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_b4ef5748-1284-471f-9b91-7bff7b54d391/sv-benchmarks/c/combinations/gcd_3+newton_3_7.i[1226,1239] [2023-12-02 20:09:17,461 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_b4ef5748-1284-471f-9b91-7bff7b54d391/sv-benchmarks/c/combinations/gcd_3+newton_3_7.i[2862,2875] [2023-12-02 20:09:17,462 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 20:09:17,480 INFO L206 MainTranslator]: Completed translation [2023-12-02 20:09:17,480 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17 WrapperNode [2023-12-02 20:09:17,480 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 20:09:17,481 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 20:09:17,482 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 20:09:17,482 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 20:09:17,488 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,498 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,521 INFO L138 Inliner]: procedures = 28, calls = 26, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 88 [2023-12-02 20:09:17,521 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 20:09:17,522 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 20:09:17,522 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 20:09:17,523 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 20:09:17,530 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,530 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,535 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,535 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,544 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,548 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,550 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,552 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,556 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 20:09:17,557 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 20:09:17,557 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 20:09:17,558 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 20:09:17,558 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (1/1) ... [2023-12-02 20:09:17,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 20:09:17,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:09:17,584 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 20:09:17,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 20:09:17,620 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 20:09:17,620 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2023-12-02 20:09:17,620 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2023-12-02 20:09:17,621 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2023-12-02 20:09:17,621 INFO L130 BoogieDeclarations]: Found specification of procedure f [2023-12-02 20:09:17,621 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2023-12-02 20:09:17,621 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 20:09:17,621 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 20:09:17,690 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 20:09:17,692 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 20:09:27,778 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 20:09:27,802 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 20:09:27,802 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-12-02 20:09:27,802 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:09:27 BoogieIcfgContainer [2023-12-02 20:09:27,802 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 20:09:27,805 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 20:09:27,805 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 20:09:27,809 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 20:09:27,809 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 08:09:17" (1/3) ... [2023-12-02 20:09:27,810 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d45d5cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:09:27, skipping insertion in model container [2023-12-02 20:09:27,810 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:09:17" (2/3) ... [2023-12-02 20:09:27,810 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d45d5cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:09:27, skipping insertion in model container [2023-12-02 20:09:27,811 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:09:27" (3/3) ... [2023-12-02 20:09:27,812 INFO L112 eAbstractionObserver]: Analyzing ICFG gcd_3+newton_3_7.i [2023-12-02 20:09:27,827 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 20:09:27,827 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-12-02 20:09:27,870 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 20:09:27,875 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;@7fe732a9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 20:09:27,875 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-12-02 20:09:27,879 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 22 states have (on average 1.5) internal successors, (33), 24 states have internal predecessors, (33), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 20:09:27,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 20:09:27,887 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:09:27,887 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:09:27,888 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 20:09:27,893 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:09:27,893 INFO L85 PathProgramCache]: Analyzing trace with hash 210916014, now seen corresponding path program 1 times [2023-12-02 20:09:27,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 20:09:27,906 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1899401891] [2023-12-02 20:09:27,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:27,906 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 20:09:27,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 20:09:27,908 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 20:09:27,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2023-12-02 20:09:27,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:27,970 INFO L262 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 20:09:27,975 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:09:28,111 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:28,111 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 20:09:28,112 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 20:09:28,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1899401891] [2023-12-02 20:09:28,113 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1899401891] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 20:09:28,113 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 20:09:28,113 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 20:09:28,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444332118] [2023-12-02 20:09:28,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 20:09:28,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 20:09:28,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 20:09:28,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 20:09:28,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 20:09:28,145 INFO L87 Difference]: Start difference. First operand has 33 states, 22 states have (on average 1.5) internal successors, (33), 24 states have internal predecessors, (33), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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) [2023-12-02 20:09:31,432 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.19s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:09:33,436 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:09:36,840 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.84s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:09:38,845 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:09:39,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:09:39,266 INFO L93 Difference]: Finished difference Result 61 states and 81 transitions. [2023-12-02 20:09:39,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 20:09:39,268 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 20:09:39,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:09:39,277 INFO L225 Difference]: With dead ends: 61 [2023-12-02 20:09:39,277 INFO L226 Difference]: Without dead ends: 29 [2023-12-02 20:09:39,280 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 20:09:39,284 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:09:39,285 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 62 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 4 Unknown, 0 Unchecked, 11.1s Time] [2023-12-02 20:09:39,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-12-02 20:09:39,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-12-02 20:09:39,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 20:09:39,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2023-12-02 20:09:39,325 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 9 [2023-12-02 20:09:39,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:09:39,325 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2023-12-02 20:09:39,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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) [2023-12-02 20:09:39,325 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2023-12-02 20:09:39,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 20:09:39,326 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:09:39,326 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:09:39,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2023-12-02 20:09:39,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 20:09:39,527 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 20:09:39,528 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:09:39,528 INFO L85 PathProgramCache]: Analyzing trace with hash 268174316, now seen corresponding path program 1 times [2023-12-02 20:09:39,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 20:09:39,529 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2551014] [2023-12-02 20:09:39,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:39,529 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 20:09:39,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 20:09:39,530 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 20:09:39,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2023-12-02 20:09:39,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:39,580 INFO L262 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 20:09:39,581 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:09:39,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:39,761 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 20:09:39,761 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 20:09:39,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2551014] [2023-12-02 20:09:39,761 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2551014] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 20:09:39,762 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 20:09:39,762 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 20:09:39,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953926366] [2023-12-02 20:09:39,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 20:09:39,764 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 20:09:39,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 20:09:39,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 20:09:39,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 20:09:39,765 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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) [2023-12-02 20:09:43,109 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:09:45,112 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:09:47,116 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:09:50,282 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.82s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:09:52,284 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:09:54,295 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:09:54,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:09:54,298 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2023-12-02 20:09:54,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 20:09:54,533 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 20:09:54,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:09:54,534 INFO L225 Difference]: With dead ends: 39 [2023-12-02 20:09:54,534 INFO L226 Difference]: Without dead ends: 31 [2023-12-02 20:09:54,535 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 20:09:54,536 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 6 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.5s IncrementalHoareTripleChecker+Time [2023-12-02 20:09:54,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 81 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 6 Unknown, 0 Unchecked, 14.5s Time] [2023-12-02 20:09:54,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-12-02 20:09:54,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2023-12-02 20:09:54,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 20 states have internal predecessors, (22), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 20:09:54,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2023-12-02 20:09:54,543 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 9 [2023-12-02 20:09:54,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:09:54,544 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2023-12-02 20:09:54,544 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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) [2023-12-02 20:09:54,544 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2023-12-02 20:09:54,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 20:09:54,545 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:09:54,545 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:09:54,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2023-12-02 20:09:54,745 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 20:09:54,746 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 20:09:54,746 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:09:54,746 INFO L85 PathProgramCache]: Analyzing trace with hash 2043181678, now seen corresponding path program 1 times [2023-12-02 20:09:54,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 20:09:54,746 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1376472647] [2023-12-02 20:09:54,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:54,747 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 20:09:54,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 20:09:54,748 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 20:09:54,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2023-12-02 20:09:54,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:54,782 INFO L262 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 20:09:54,783 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:09:55,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:55,267 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 20:09:55,268 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 20:09:55,268 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1376472647] [2023-12-02 20:09:55,268 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1376472647] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 20:09:55,268 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 20:09:55,268 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 20:09:55,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810705294] [2023-12-02 20:09:55,269 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 20:09:55,269 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 20:09:55,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 20:09:55,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 20:09:55,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 20:09:55,271 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 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) [2023-12-02 20:09:58,617 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:10:00,621 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:10:02,625 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:10:04,631 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:10:06,634 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:10:09,927 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.82s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:10:11,933 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:10:13,937 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:10:15,941 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:10:17,950 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:10:17,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:10:17,953 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2023-12-02 20:10:18,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 20:10:18,188 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 20:10:18,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:10:18,189 INFO L225 Difference]: With dead ends: 35 [2023-12-02 20:10:18,189 INFO L226 Difference]: Without dead ends: 30 [2023-12-02 20:10:18,190 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-12-02 20:10:18,191 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 3 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:10:18,191 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 99 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 10 Unknown, 0 Unchecked, 22.6s Time] [2023-12-02 20:10:18,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-12-02 20:10:18,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2023-12-02 20:10:18,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 20 states have internal predecessors, (22), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 20:10:18,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2023-12-02 20:10:18,197 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 9 [2023-12-02 20:10:18,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:10:18,197 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2023-12-02 20:10:18,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 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) [2023-12-02 20:10:18,198 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2023-12-02 20:10:18,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 20:10:18,199 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:10:18,199 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:10:18,201 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Ended with exit code 0 [2023-12-02 20:10:18,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 20:10:18,400 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 20:10:18,400 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:10:18,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1419511809, now seen corresponding path program 1 times [2023-12-02 20:10:18,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 20:10:18,400 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1078333348] [2023-12-02 20:10:18,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:10:18,401 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 20:10:18,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 20:10:18,402 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 20:10:18,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2023-12-02 20:10:18,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:10:18,488 INFO L262 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 20:10:18,490 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:10:24,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:10:24,427 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:10:42,330 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:10:42,331 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 20:10:42,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1078333348] [2023-12-02 20:10:42,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1078333348] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:10:42,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1757720842] [2023-12-02 20:10:42,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:10:42,331 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2023-12-02 20:10:42,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/cvc4 [2023-12-02 20:10:42,333 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2023-12-02 20:10:42,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2023-12-02 20:10:42,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:10:42,496 INFO L262 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 20:10:42,498 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:10:48,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:10:48,895 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:11:00,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:11:00,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1757720842] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:11:00,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307373087] [2023-12-02 20:11:00,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:11:00,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:11:00,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:11:00,841 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:11:00,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 20:11:00,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:11:00,943 INFO L262 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 20:11:00,944 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:11:08,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:11:08,202 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:11:09,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:11:09,012 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307373087] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:11:09,012 INFO L185 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2023-12-02 20:11:09,012 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 24 [2023-12-02 20:11:09,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940796581] [2023-12-02 20:11:09,012 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2023-12-02 20:11:09,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-12-02 20:11:09,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 20:11:09,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-12-02 20:11:09,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=421, Unknown=9, NotChecked=0, Total=552 [2023-12-02 20:11:09,015 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:11:13,232 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [0, 1] [2023-12-02 20:11:15,841 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.70s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [1] [2023-12-02 20:11:19,075 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.23s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:11:21,080 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:11:23,087 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:11:25,091 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:11:26,387 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:11:29,198 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [1] [2023-12-02 20:11:31,190 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.99s for a HTC check with result INVALID. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:11:35,392 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.73s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [1] [2023-12-02 20:11:54,582 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.88s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:11:56,589 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:11:58,596 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:12:00,599 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:12:02,606 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:12:04,610 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:12:06,627 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-12-02 20:12:08,632 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [1] [2023-12-02 20:12:10,646 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [1] [2023-12-02 20:12:13,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:12:13,640 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2023-12-02 20:12:13,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-12-02 20:12:13,641 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-12-02 20:12:13,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:12:13,642 INFO L225 Difference]: With dead ends: 47 [2023-12-02 20:12:13,642 INFO L226 Difference]: Without dead ends: 35 [2023-12-02 20:12:13,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 61.4s TimeCoverageRelationStatistics Valid=205, Invalid=714, Unknown=11, NotChecked=0, Total=930 [2023-12-02 20:12:13,643 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 14 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 6 mSolverCounterUnsat, 14 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 46.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 14 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 47.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:12:13,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 348 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 124 Invalid, 14 Unknown, 0 Unchecked, 47.7s Time] [2023-12-02 20:12:13,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-12-02 20:12:13,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2023-12-02 20:12:13,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 24 states have internal predecessors, (26), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 20:12:13,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2023-12-02 20:12:13,653 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 10 [2023-12-02 20:12:13,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:12:13,653 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2023-12-02 20:12:13,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:12:13,654 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2023-12-02 20:12:13,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 20:12:13,654 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:12:13,655 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:12:13,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 20:12:13,858 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (5)] Ended with exit code 0 [2023-12-02 20:12:14,058 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt (6)] Ended with exit code 0 [2023-12-02 20:12:14,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt [2023-12-02 20:12:14,256 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 20:12:14,256 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:12:14,256 INFO L85 PathProgramCache]: Analyzing trace with hash -1475353663, now seen corresponding path program 2 times [2023-12-02 20:12:14,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 20:12:14,257 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [965833873] [2023-12-02 20:12:14,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-12-02 20:12:14,257 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 20:12:14,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 20:12:14,258 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 20:12:14,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2023-12-02 20:12:31,703 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-12-02 20:12:31,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:12:31,721 WARN L260 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 31 conjunts are in the unsatisfiable core [2023-12-02 20:12:31,723 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:14:44,259 WARN L293 SmtUtils]: Spent 19.26s on a formula simplification that was a NOOP. DAG size: 39 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 20:15:04,568 WARN L854 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_gcd_test_~b#1_29| (_ BitVec 8)) (|ULTIMATE.start_main1_~x~0#1| (_ BitVec 8))) (let ((.cse3 ((_ sign_extend 24) |v_ULTIMATE.start_gcd_test_~b#1_29|))) (let ((.cse2 ((_ sign_extend 24) |ULTIMATE.start_main1_~x~0#1|)) (.cse6 ((_ sign_extend 24) ((_ extract 7 0) (bvneg .cse3))))) (let ((.cse5 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse2 .cse6))))) (let ((.cse4 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse6 .cse5))))) (let ((.cse0 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse5 .cse4))))) (let ((.cse1 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse4 .cse0))))) (and (= ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse0 .cse1))) (_ bv0 32)) (not (= (_ bv0 32) .cse0)) (not (bvsge .cse2 .cse1)) (bvslt .cse3 (_ bv0 32)) (not (bvslt .cse2 (_ bv0 32))))))))))) is different from false [2023-12-02 20:15:06,588 WARN L876 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_gcd_test_~b#1_29| (_ BitVec 8)) (|ULTIMATE.start_main1_~x~0#1| (_ BitVec 8))) (let ((.cse3 ((_ sign_extend 24) |v_ULTIMATE.start_gcd_test_~b#1_29|))) (let ((.cse2 ((_ sign_extend 24) |ULTIMATE.start_main1_~x~0#1|)) (.cse6 ((_ sign_extend 24) ((_ extract 7 0) (bvneg .cse3))))) (let ((.cse5 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse2 .cse6))))) (let ((.cse4 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse6 .cse5))))) (let ((.cse0 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse5 .cse4))))) (let ((.cse1 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse4 .cse0))))) (and (= ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse0 .cse1))) (_ bv0 32)) (not (= (_ bv0 32) .cse0)) (not (bvsge .cse2 .cse1)) (bvslt .cse3 (_ bv0 32)) (not (bvslt .cse2 (_ bv0 32))))))))))) is different from true [2023-12-02 20:15:06,589 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 13 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:15:06,589 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:19:30,859 WARN L293 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 35 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 20:19:52,456 WARN L854 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_gcd_test_~b#1| (_ BitVec 8)) (|v_ULTIMATE.start_main1_~x~0#1_11| (_ BitVec 8))) (let ((.cse1 ((_ sign_extend 24) |v_ULTIMATE.start_main1_~x~0#1_11|)) (.cse5 ((_ sign_extend 24) ((_ extract 7 0) (bvneg ((_ sign_extend 24) |ULTIMATE.start_gcd_test_~b#1|)))))) (let ((.cse4 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse1 .cse5))))) (let ((.cse3 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse5 .cse4))))) (let ((.cse0 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse4 .cse3))))) (let ((.cse2 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse3 .cse0))))) (or (= .cse0 (_ bv0 32)) (bvsge .cse1 .cse2) (not (bvsgt .cse1 (_ bv0 32))) (not (= ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse0 .cse2))) (_ bv0 32)))))))))) is different from false [2023-12-02 20:19:54,493 WARN L876 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_gcd_test_~b#1| (_ BitVec 8)) (|v_ULTIMATE.start_main1_~x~0#1_11| (_ BitVec 8))) (let ((.cse1 ((_ sign_extend 24) |v_ULTIMATE.start_main1_~x~0#1_11|)) (.cse5 ((_ sign_extend 24) ((_ extract 7 0) (bvneg ((_ sign_extend 24) |ULTIMATE.start_gcd_test_~b#1|)))))) (let ((.cse4 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse1 .cse5))))) (let ((.cse3 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse5 .cse4))))) (let ((.cse0 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse4 .cse3))))) (let ((.cse2 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse3 .cse0))))) (or (= .cse0 (_ bv0 32)) (bvsge .cse1 .cse2) (not (bvsgt .cse1 (_ bv0 32))) (not (= ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse0 .cse2))) (_ bv0 32)))))))))) is different from true [2023-12-02 20:19:54,494 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:19:54,494 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 20:19:54,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [965833873] [2023-12-02 20:19:54,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [965833873] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:19:54,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [892949208] [2023-12-02 20:19:54,494 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-12-02 20:19:54,494 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2023-12-02 20:19:54,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/cvc4 [2023-12-02 20:19:54,495 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2023-12-02 20:19:54,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4ef5748-1284-471f-9b91-7bff7b54d391/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2023-12-02 20:19:55,162 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-12-02 20:19:55,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:19:55,164 WARN L260 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 20:19:55,166 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:21:43,413 WARN L293 SmtUtils]: Spent 5.15s on a formula simplification that was a NOOP. DAG size: 36 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 20:22:58,417 WARN L293 SmtUtils]: Spent 16.03s on a formula simplification that was a NOOP. DAG size: 38 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 20:23:14,775 WARN L854 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_gcd_test_~b#1_29| (_ BitVec 8)) (|ULTIMATE.start_main1_~x~0#1| (_ BitVec 8))) (let ((.cse2 ((_ sign_extend 24) |ULTIMATE.start_main1_~x~0#1|)) (.cse5 ((_ sign_extend 24) ((_ extract 7 0) (bvneg ((_ sign_extend 24) |v_ULTIMATE.start_gcd_test_~b#1_29|)))))) (let ((.cse4 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse2 .cse5))))) (let ((.cse3 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse5 .cse4))))) (let ((.cse0 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse4 .cse3))))) (let ((.cse1 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse3 .cse0))))) (and (= ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse0 .cse1))) (_ bv0 32)) (not (= (_ bv0 32) .cse0)) (not (bvsge .cse2 .cse1)) (not (bvslt .cse2 (_ bv0 32)))))))))) is different from false [2023-12-02 20:23:16,802 WARN L876 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_gcd_test_~b#1_29| (_ BitVec 8)) (|ULTIMATE.start_main1_~x~0#1| (_ BitVec 8))) (let ((.cse2 ((_ sign_extend 24) |ULTIMATE.start_main1_~x~0#1|)) (.cse5 ((_ sign_extend 24) ((_ extract 7 0) (bvneg ((_ sign_extend 24) |v_ULTIMATE.start_gcd_test_~b#1_29|)))))) (let ((.cse4 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse2 .cse5))))) (let ((.cse3 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse5 .cse4))))) (let ((.cse0 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse4 .cse3))))) (let ((.cse1 ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse3 .cse0))))) (and (= ((_ sign_extend 24) ((_ extract 7 0) (bvsrem .cse0 .cse1))) (_ bv0 32)) (not (= (_ bv0 32) .cse0)) (not (bvsge .cse2 .cse1)) (not (bvslt .cse2 (_ bv0 32)))))))))) is different from true [2023-12-02 20:23:16,803 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 10 refuted. 5 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:23:16,803 INFO L327 TraceCheckSpWp]: Computing backward predicates...