./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/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_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/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_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/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 b3da85103e65fd13a584e838d8b961878044a0a70e09ad1788e3ca53a404f357 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 19:04:37,666 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 19:04:37,732 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 19:04:37,737 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 19:04:37,737 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 19:04:37,761 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 19:04:37,762 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 19:04:37,763 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 19:04:37,763 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 19:04:37,764 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 19:04:37,764 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 19:04:37,765 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 19:04:37,765 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 19:04:37,766 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 19:04:37,766 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 19:04:37,767 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 19:04:37,767 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 19:04:37,768 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 19:04:37,768 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 19:04:37,769 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 19:04:37,769 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 19:04:37,770 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 19:04:37,771 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 19:04:37,771 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 19:04:37,772 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 19:04:37,772 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 19:04:37,772 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 19:04:37,773 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 19:04:37,773 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 19:04:37,774 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 19:04:37,774 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 19:04:37,774 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 19:04:37,775 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 19:04:37,775 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 19:04:37,775 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 19:04:37,776 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 19:04:37,776 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 19:04:37,776 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:04:37,776 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 19:04:37,776 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 19:04:37,777 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 19:04:37,777 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 19:04:37,777 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 19:04:37,777 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 19:04:37,778 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 19:04:37,778 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 19:04:37,778 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 19:04:37,778 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_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3da85103e65fd13a584e838d8b961878044a0a70e09ad1788e3ca53a404f357 [2023-12-02 19:04:37,999 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 19:04:38,019 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 19:04:38,021 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 19:04:38,022 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 19:04:38,023 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 19:04:38,024 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/loops/invert_string-1.c [2023-12-02 19:04:40,800 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 19:04:41,005 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 19:04:41,005 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/sv-benchmarks/c/loops/invert_string-1.c [2023-12-02 19:04:41,012 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/data/005dc04a3/7a01e69a67d44b10b1c7c4b8cdd022e1/FLAGbb521d80f [2023-12-02 19:04:41,024 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/data/005dc04a3/7a01e69a67d44b10b1c7c4b8cdd022e1 [2023-12-02 19:04:41,027 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 19:04:41,028 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 19:04:41,030 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 19:04:41,030 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 19:04:41,035 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 19:04:41,036 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,037 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2eac367a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41, skipping insertion in model container [2023-12-02 19:04:41,037 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,057 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 19:04:41,198 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_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/sv-benchmarks/c/loops/invert_string-1.c[352,365] [2023-12-02 19:04:41,215 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:04:41,223 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 19:04:41,232 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_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/sv-benchmarks/c/loops/invert_string-1.c[352,365] [2023-12-02 19:04:41,240 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:04:41,251 INFO L206 MainTranslator]: Completed translation [2023-12-02 19:04:41,251 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41 WrapperNode [2023-12-02 19:04:41,252 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 19:04:41,252 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 19:04:41,253 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 19:04:41,253 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 19:04:41,258 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,264 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,281 INFO L138 Inliner]: procedures = 15, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 75 [2023-12-02 19:04:41,281 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 19:04:41,282 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 19:04:41,282 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 19:04:41,282 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 19:04:41,288 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,289 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,290 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,291 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,296 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,300 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,302 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,303 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,305 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 19:04:41,306 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 19:04:41,306 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 19:04:41,306 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 19:04:41,307 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (1/1) ... [2023-12-02 19:04:41,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:04:41,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:41,337 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 19:04:41,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 19:04:41,367 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 19:04:41,368 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 19:04:41,368 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 19:04:41,368 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 19:04:41,368 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 19:04:41,368 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 19:04:41,368 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 19:04:41,369 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 19:04:41,436 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 19:04:41,439 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 19:04:41,574 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 19:04:41,633 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 19:04:41,633 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-12-02 19:04:41,634 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:04:41 BoogieIcfgContainer [2023-12-02 19:04:41,635 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 19:04:41,637 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 19:04:41,637 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 19:04:41,641 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 19:04:41,641 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 07:04:41" (1/3) ... [2023-12-02 19:04:41,642 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c212fa9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:04:41, skipping insertion in model container [2023-12-02 19:04:41,642 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:04:41" (2/3) ... [2023-12-02 19:04:41,642 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c212fa9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:04:41, skipping insertion in model container [2023-12-02 19:04:41,642 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:04:41" (3/3) ... [2023-12-02 19:04:41,644 INFO L112 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2023-12-02 19:04:41,661 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 19:04:41,661 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 19:04:41,701 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 19:04:41,707 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;@4d965778, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 19:04:41,707 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 19:04:41,711 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 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 19:04:41,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 19:04:41,716 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:41,716 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 19:04:41,717 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:41,721 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:41,721 INFO L85 PathProgramCache]: Analyzing trace with hash -1214562904, now seen corresponding path program 1 times [2023-12-02 19:04:41,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:41,728 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107915073] [2023-12-02 19:04:41,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:41,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:41,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:41,968 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 19:04:41,968 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:41,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107915073] [2023-12-02 19:04:41,969 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107915073] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:04:41,969 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:04:41,970 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 19:04:41,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257449072] [2023-12-02 19:04:41,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:41,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:04:41,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:42,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:04:42,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:04:42,007 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 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) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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 19:04:42,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:42,048 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2023-12-02 19:04:42,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:04:42,051 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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 19:04:42,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:42,057 INFO L225 Difference]: With dead ends: 17 [2023-12-02 19:04:42,058 INFO L226 Difference]: Without dead ends: 9 [2023-12-02 19:04:42,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:04:42,063 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:42,064 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:04:42,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-12-02 19:04:42,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-12-02 19:04:42,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:42,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2023-12-02 19:04:42,089 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2023-12-02 19:04:42,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:42,090 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2023-12-02 19:04:42,090 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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 19:04:42,090 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2023-12-02 19:04:42,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 19:04:42,091 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:42,091 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:42,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 19:04:42,091 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:42,092 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:42,092 INFO L85 PathProgramCache]: Analyzing trace with hash 805619251, now seen corresponding path program 1 times [2023-12-02 19:04:42,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:42,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142548879] [2023-12-02 19:04:42,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:42,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:42,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:42,191 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:04:42,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:42,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142548879] [2023-12-02 19:04:42,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142548879] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:04:42,192 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:04:42,192 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 19:04:42,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150330399] [2023-12-02 19:04:42,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:42,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:04:42,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:42,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:04:42,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:04:42,196 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 19:04:42,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:42,228 INFO L93 Difference]: Finished difference Result 15 states and 18 transitions. [2023-12-02 19:04:42,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:04:42,229 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 19:04:42,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:42,229 INFO L225 Difference]: With dead ends: 15 [2023-12-02 19:04:42,229 INFO L226 Difference]: Without dead ends: 10 [2023-12-02 19:04:42,230 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:04:42,232 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:42,232 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 3 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:04:42,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-12-02 19:04:42,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-12-02 19:04:42,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 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 19:04:42,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2023-12-02 19:04:42,254 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2023-12-02 19:04:42,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:42,255 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2023-12-02 19:04:42,255 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 19:04:42,255 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2023-12-02 19:04:42,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 19:04:42,256 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:42,256 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:42,256 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 19:04:42,256 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:42,257 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:42,257 INFO L85 PathProgramCache]: Analyzing trace with hash -800227495, now seen corresponding path program 1 times [2023-12-02 19:04:42,257 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:42,257 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399765680] [2023-12-02 19:04:42,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:42,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:42,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:42,839 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:04:42,839 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:42,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399765680] [2023-12-02 19:04:42,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [399765680] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:42,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838448338] [2023-12-02 19:04:42,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:42,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:42,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:42,842 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:42,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 19:04:42,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:42,920 INFO L262 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 30 conjunts are in the unsatisfiable core [2023-12-02 19:04:42,926 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:42,988 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2023-12-02 19:04:43,096 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2023-12-02 19:04:43,168 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:04:43,169 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:43,224 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:04:43,224 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2023-12-02 19:04:43,236 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 18 [2023-12-02 19:04:43,251 INFO L349 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2023-12-02 19:04:43,251 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23 [2023-12-02 19:04:43,396 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:04:43,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838448338] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:04:43,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1909356682] [2023-12-02 19:04:43,416 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 19:04:43,416 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:04:43,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:04:43,425 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:04:43,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:04:43,772 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:04:44,206 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '150#(and (= |ULTIMATE.start_main_~i~0#1| 0) (exists ((|v_ULTIMATE.start_main_~i~0#1_67| Int) (|v_ULTIMATE.start_main_~j~0#1_43| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 0 |v_ULTIMATE.start_main_~j~0#1_43|) (<= 2 |ULTIMATE.start_main_~#str1~0#1.base|) (<= (+ |v_ULTIMATE.start_main_~i~0#1_67| 1) 0) (= |ULTIMATE.start_main_~cont~0#1| 0) (= |ULTIMATE.start_main_~#str2~0#1.offset| 0) (= |ULTIMATE.start_main_~#str1~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#str2~0#1.base|))) (= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~MAX~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str1~0#1.base|) |ULTIMATE.start_main_~#str1~0#1.offset|) |ULTIMATE.start_main_#t~mem11#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 1 |ULTIMATE.start_main_~MAX~0#1|) (not (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str2~0#1.base|) (+ |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~#str2~0#1.offset|)) |ULTIMATE.start_main_#t~mem12#1|))' at error location [2023-12-02 19:04:44,206 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:04:44,206 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:04:44,207 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2023-12-02 19:04:44,207 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586308385] [2023-12-02 19:04:44,207 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:04:44,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-12-02 19:04:44,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:44,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-12-02 19:04:44,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2023-12-02 19:04:44,210 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 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 19:04:44,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:44,605 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2023-12-02 19:04:44,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 19:04:44,606 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 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 8 [2023-12-02 19:04:44,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:44,607 INFO L225 Difference]: With dead ends: 28 [2023-12-02 19:04:44,607 INFO L226 Difference]: Without dead ends: 26 [2023-12-02 19:04:44,608 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=169, Invalid=643, Unknown=0, NotChecked=0, Total=812 [2023-12-02 19:04:44,609 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 40 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:44,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 41 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:04:44,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-12-02 19:04:44,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 15. [2023-12-02 19:04:44,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 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 19:04:44,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2023-12-02 19:04:44,617 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 8 [2023-12-02 19:04:44,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:44,618 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2023-12-02 19:04:44,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 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 19:04:44,618 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2023-12-02 19:04:44,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 19:04:44,619 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:44,619 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:44,624 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 19:04:44,819 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:44,820 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:44,820 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:44,820 INFO L85 PathProgramCache]: Analyzing trace with hash -730394332, now seen corresponding path program 2 times [2023-12-02 19:04:44,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:44,821 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315857913] [2023-12-02 19:04:44,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:44,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:44,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:44,895 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:04:44,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:44,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315857913] [2023-12-02 19:04:44,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315857913] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:44,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195229354] [2023-12-02 19:04:44,896 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:04:44,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:44,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:44,898 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:44,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 19:04:44,965 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 19:04:44,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:04:44,966 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 19:04:44,968 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:44,980 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:04:44,980 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:45,007 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:04:45,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195229354] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:04:45,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [103486225] [2023-12-02 19:04:45,009 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 19:04:45,009 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:04:45,010 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:04:45,010 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:04:45,010 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:04:45,216 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:04:45,520 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '290#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~MAX~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (exists ((|v_ULTIMATE.start_main_~j~0#1_50| Int) (|v_ULTIMATE.start_main_~i~0#1_81| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#str1~0#1.base|) (<= 0 |v_ULTIMATE.start_main_~j~0#1_50|) (<= (+ |v_ULTIMATE.start_main_~i~0#1_81| 1) 0) (= |ULTIMATE.start_main_~cont~0#1| 0) (= |ULTIMATE.start_main_~#str2~0#1.offset| 0) (= |ULTIMATE.start_main_~#str1~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#str2~0#1.base|))) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str1~0#1.base|) |ULTIMATE.start_main_~#str1~0#1.offset|) |ULTIMATE.start_main_#t~mem11#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 1 |ULTIMATE.start_main_~MAX~0#1|) (not (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str2~0#1.base|) (+ |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~#str2~0#1.offset|)) |ULTIMATE.start_main_#t~mem12#1|))' at error location [2023-12-02 19:04:45,521 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:04:45,522 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:04:45,522 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2023-12-02 19:04:45,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438479623] [2023-12-02 19:04:45,523 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:04:45,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 19:04:45,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:45,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 19:04:45,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2023-12-02 19:04:45,524 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:45,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:45,607 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2023-12-02 19:04:45,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 19:04:45,608 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 19:04:45,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:45,609 INFO L225 Difference]: With dead ends: 28 [2023-12-02 19:04:45,609 INFO L226 Difference]: Without dead ends: 23 [2023-12-02 19:04:45,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2023-12-02 19:04:45,610 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 30 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:45,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 15 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:04:45,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-12-02 19:04:45,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 16. [2023-12-02 19:04:45,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 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 19:04:45,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2023-12-02 19:04:45,618 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2023-12-02 19:04:45,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:45,619 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2023-12-02 19:04:45,619 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:45,619 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2023-12-02 19:04:45,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 19:04:45,619 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:45,620 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:45,624 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 19:04:45,820 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:45,821 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:45,821 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:45,821 INFO L85 PathProgramCache]: Analyzing trace with hash -1172008312, now seen corresponding path program 3 times [2023-12-02 19:04:45,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:45,821 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038832659] [2023-12-02 19:04:45,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:45,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:45,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:46,258 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:04:46,258 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:46,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038832659] [2023-12-02 19:04:46,259 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2038832659] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:46,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518345871] [2023-12-02 19:04:46,259 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:04:46,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:46,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:46,263 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:46,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 19:04:46,324 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:04:46,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:04:46,326 WARN L260 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 19:04:46,329 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:46,384 INFO L349 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2023-12-02 19:04:46,385 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2023-12-02 19:04:46,466 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 19:04:46,467 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:46,532 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:04:46,533 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2023-12-02 19:04:46,539 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 18 [2023-12-02 19:04:46,589 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 19:04:46,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518345871] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:04:46,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [821305545] [2023-12-02 19:04:46,592 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 19:04:46,592 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:04:46,592 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:04:46,592 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:04:46,592 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:04:46,793 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:04:47,139 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '441#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str2~0#1.base|) |ULTIMATE.start_main_~j~0#1|) |ULTIMATE.start_main_#t~mem12#1|) (= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~MAX~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~cont~0#1| 0) (= |ULTIMATE.start_main_~#str2~0#1.offset| 0) (exists ((|v_ULTIMATE.start_main_~j~0#1_59| Int) (|v_ULTIMATE.start_main_~i~0#1_96| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#str1~0#1.base|) (<= 0 |v_ULTIMATE.start_main_~j~0#1_59|) (<= (+ |v_ULTIMATE.start_main_~i~0#1_96| 1) 0) (<= 2 |ULTIMATE.start_main_~#str2~0#1.base|))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 1 |ULTIMATE.start_main_~MAX~0#1|) (= |ULTIMATE.start_main_~#str1~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem11#1|))' at error location [2023-12-02 19:04:47,140 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:04:47,140 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:04:47,140 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 19 [2023-12-02 19:04:47,140 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001875380] [2023-12-02 19:04:47,140 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:04:47,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 19:04:47,141 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:47,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 19:04:47,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2023-12-02 19:04:47,142 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 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 19:04:48,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:48,420 INFO L93 Difference]: Finished difference Result 95 states and 113 transitions. [2023-12-02 19:04:48,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-12-02 19:04:48,420 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 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 19:04:48,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:48,422 INFO L225 Difference]: With dead ends: 95 [2023-12-02 19:04:48,422 INFO L226 Difference]: Without dead ends: 93 [2023-12-02 19:04:48,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=585, Invalid=2721, Unknown=0, NotChecked=0, Total=3306 [2023-12-02 19:04:48,424 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 109 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:48,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 96 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 314 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 19:04:48,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-12-02 19:04:48,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 21. [2023-12-02 19:04:48,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 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 19:04:48,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 29 transitions. [2023-12-02 19:04:48,437 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 29 transitions. Word has length 10 [2023-12-02 19:04:48,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:48,437 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 29 transitions. [2023-12-02 19:04:48,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 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 19:04:48,437 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 29 transitions. [2023-12-02 19:04:48,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 19:04:48,438 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:48,438 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:48,442 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 19:04:48,638 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:48,639 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:48,639 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:48,639 INFO L85 PathProgramCache]: Analyzing trace with hash 1791295595, now seen corresponding path program 1 times [2023-12-02 19:04:48,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:48,639 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981520632] [2023-12-02 19:04:48,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:48,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:48,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:48,715 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:04:48,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:48,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981520632] [2023-12-02 19:04:48,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981520632] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:48,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442679162] [2023-12-02 19:04:48,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:48,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:48,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:48,717 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:48,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 19:04:48,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:48,780 INFO L262 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 19:04:48,782 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:48,828 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:04:48,828 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:48,865 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:04:48,865 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442679162] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:04:48,865 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [850230829] [2023-12-02 19:04:48,867 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 19:04:48,868 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:04:48,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:04:48,868 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:04:48,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:04:49,173 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:04:49,356 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '755#(and (<= (+ |ULTIMATE.start_main_~i~0#1| 1) |ULTIMATE.start_main_~MAX~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str2~0#1.base|) |ULTIMATE.start_main_~j~0#1|) |ULTIMATE.start_main_#t~mem12#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~cont~0#1| 0) (= |ULTIMATE.start_main_~#str2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str1~0#1.base|) |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem11#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#str1~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|)))' at error location [2023-12-02 19:04:49,356 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:04:49,357 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:04:49,357 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2023-12-02 19:04:49,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104557099] [2023-12-02 19:04:49,357 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:04:49,357 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 19:04:49,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:49,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 19:04:49,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2023-12-02 19:04:49,358 INFO L87 Difference]: Start difference. First operand 21 states and 29 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 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 19:04:49,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:49,421 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2023-12-02 19:04:49,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 19:04:49,421 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 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 11 [2023-12-02 19:04:49,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:49,422 INFO L225 Difference]: With dead ends: 42 [2023-12-02 19:04:49,422 INFO L226 Difference]: Without dead ends: 31 [2023-12-02 19:04:49,422 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2023-12-02 19:04:49,423 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 8 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:49,423 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 25 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:04:49,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-12-02 19:04:49,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 21. [2023-12-02 19:04:49,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 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 19:04:49,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2023-12-02 19:04:49,433 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 11 [2023-12-02 19:04:49,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:49,433 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2023-12-02 19:04:49,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 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 19:04:49,433 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2023-12-02 19:04:49,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 19:04:49,434 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:49,434 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:49,439 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 19:04:49,636 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:49,636 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:49,637 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:49,637 INFO L85 PathProgramCache]: Analyzing trace with hash -1505334564, now seen corresponding path program 2 times [2023-12-02 19:04:49,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:49,637 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962170368] [2023-12-02 19:04:49,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:49,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:49,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-12-02 19:04:49,656 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-12-02 19:04:49,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-12-02 19:04:49,694 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2023-12-02 19:04:49,694 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-12-02 19:04:49,695 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-12-02 19:04:49,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 19:04:49,699 INFO L445 BasicCegarLoop]: Path program histogram: [3, 2, 1, 1] [2023-12-02 19:04:49,702 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-12-02 19:04:49,724 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.12 07:04:49 BoogieIcfgContainer [2023-12-02 19:04:49,725 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-12-02 19:04:49,725 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2023-12-02 19:04:49,725 INFO L270 PluginConnector]: Initializing Witness Printer... [2023-12-02 19:04:49,725 INFO L274 PluginConnector]: Witness Printer initialized [2023-12-02 19:04:49,726 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:04:41" (3/4) ... [2023-12-02 19:04:49,726 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2023-12-02 19:04:49,762 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02b6b26c-a8f6-43c7-b7ca-aedfc1a15e9a/bin/utaipan-verify-nQ1chXbOIh/witness.graphml [2023-12-02 19:04:49,762 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2023-12-02 19:04:49,763 INFO L158 Benchmark]: Toolchain (without parser) took 8734.89ms. Allocated memory was 159.4MB in the beginning and 197.1MB in the end (delta: 37.7MB). Free memory was 122.7MB in the beginning and 120.2MB in the end (delta: 2.5MB). Peak memory consumption was 41.8MB. Max. memory is 16.1GB. [2023-12-02 19:04:49,764 INFO L158 Benchmark]: CDTParser took 0.18ms. Allocated memory is still 159.4MB. Free memory is still 131.1MB. There was no memory consumed. Max. memory is 16.1GB. [2023-12-02 19:04:49,764 INFO L158 Benchmark]: CACSL2BoogieTranslator took 222.19ms. Allocated memory is still 159.4MB. Free memory was 122.1MB in the beginning and 111.7MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-12-02 19:04:49,764 INFO L158 Benchmark]: Boogie Procedure Inliner took 28.63ms. Allocated memory is still 159.4MB. Free memory was 111.7MB in the beginning and 110.1MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-12-02 19:04:49,765 INFO L158 Benchmark]: Boogie Preprocessor took 23.67ms. Allocated memory is still 159.4MB. Free memory was 110.1MB in the beginning and 108.5MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. [2023-12-02 19:04:49,765 INFO L158 Benchmark]: RCFGBuilder took 328.60ms. Allocated memory is still 159.4MB. Free memory was 108.5MB in the beginning and 94.4MB in the end (delta: 14.2MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2023-12-02 19:04:49,766 INFO L158 Benchmark]: TraceAbstraction took 8087.41ms. Allocated memory was 159.4MB in the beginning and 197.1MB in the end (delta: 37.7MB). Free memory was 93.3MB in the beginning and 122.3MB in the end (delta: -29.0MB). Peak memory consumption was 10.3MB. Max. memory is 16.1GB. [2023-12-02 19:04:49,766 INFO L158 Benchmark]: Witness Printer took 37.61ms. Allocated memory is still 197.1MB. Free memory was 122.3MB in the beginning and 120.2MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-12-02 19:04:49,768 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 159.4MB. Free memory is still 131.1MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 222.19ms. Allocated memory is still 159.4MB. Free memory was 122.1MB in the beginning and 111.7MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 28.63ms. Allocated memory is still 159.4MB. Free memory was 111.7MB in the beginning and 110.1MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 23.67ms. Allocated memory is still 159.4MB. Free memory was 110.1MB in the beginning and 108.5MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 328.60ms. Allocated memory is still 159.4MB. Free memory was 108.5MB in the beginning and 94.4MB in the end (delta: 14.2MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * TraceAbstraction took 8087.41ms. Allocated memory was 159.4MB in the beginning and 197.1MB in the end (delta: 37.7MB). Free memory was 93.3MB in the beginning and 122.3MB in the end (delta: -29.0MB). Peak memory consumption was 10.3MB. Max. memory is 16.1GB. * Witness Printer took 37.61ms. Allocated memory is still 197.1MB. Free memory was 122.3MB in the beginning and 120.2MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. 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 - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 VAL [MAX=2, cont=0, i=0, str1={4:0}, str2={5:0}] [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- VAL [MAX=2, cont=0, i=0, j=1, str1={4:0}, str2={5:0}] [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- VAL [MAX=2, cont=0, i=-1, j=2, str1={4:0}, str2={5:0}] [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 VAL [MAX=2, cont=0, i=0, j=1, str1={4:0}, str2={5:0}] [L35] COND TRUE i