./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_partial_init_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 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_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_partial_init_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5 --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 59d5175089b9a27cfba8f910bda680bc8b61a004048e68040b8cf993cc9cd888 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:51:43,369 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:51:43,490 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:51:43,502 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:51:43,503 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:51:43,543 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:51:43,544 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:51:43,545 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:51:43,546 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:51:43,551 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:51:43,551 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:51:43,552 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:51:43,552 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:51:43,554 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:51:43,555 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:51:43,555 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:51:43,556 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:51:43,556 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:51:43,557 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:51:43,558 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:51:43,559 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:51:43,560 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:51:43,561 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:51:43,561 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:51:43,562 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:51:43,562 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:51:43,563 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:51:43,563 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:51:43,564 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:51:43,564 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:51:43,566 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:51:43,566 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:51:43,567 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:51:43,567 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:51:43,567 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:51:43,568 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:51:43,568 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:51:43,568 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:51:43,569 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:51:43,569 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:51:43,570 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:51:43,570 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:51:43,570 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:51:43,571 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:51:43,571 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:51:43,572 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:51:43,572 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:51:43,572 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_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 59d5175089b9a27cfba8f910bda680bc8b61a004048e68040b8cf993cc9cd888 [2023-11-21 19:51:43,915 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:51:43,947 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:51:43,950 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:51:43,952 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:51:43,953 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:51:43,954 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/array-examples/standard_partial_init_ground.i [2023-11-21 19:51:47,069 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:51:47,417 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:51:47,418 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/sv-benchmarks/c/array-examples/standard_partial_init_ground.i [2023-11-21 19:51:47,427 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/data/48f8dfb98/599ce14f8c28437b8fe01e8a96c0730a/FLAGf8a196588 [2023-11-21 19:51:47,444 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/data/48f8dfb98/599ce14f8c28437b8fe01e8a96c0730a [2023-11-21 19:51:47,447 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:51:47,449 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:51:47,451 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:51:47,452 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:51:47,458 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:51:47,459 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,461 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30b0aa69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47, skipping insertion in model container [2023-11-21 19:51:47,461 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,488 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:51:47,658 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_322c2c4e-913e-4211-8cb4-29e45c1be002/sv-benchmarks/c/array-examples/standard_partial_init_ground.i[821,834] [2023-11-21 19:51:47,676 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:51:47,687 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:51:47,702 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_322c2c4e-913e-4211-8cb4-29e45c1be002/sv-benchmarks/c/array-examples/standard_partial_init_ground.i[821,834] [2023-11-21 19:51:47,712 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:51:47,727 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:51:47,728 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47 WrapperNode [2023-11-21 19:51:47,728 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:51:47,729 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:51:47,729 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:51:47,729 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:51:47,737 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,745 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,769 INFO L138 Inliner]: procedures = 16, calls = 24, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 83 [2023-11-21 19:51:47,770 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:51:47,771 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:51:47,771 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:51:47,771 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:51:47,782 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,782 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,785 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,785 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,792 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,796 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,808 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,817 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,820 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:51:47,821 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:51:47,822 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:51:47,822 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:51:47,828 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (1/1) ... [2023-11-21 19:51:47,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:51:47,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:47,861 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:51:47,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:51:47,898 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:51:47,898 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:51:47,899 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-21 19:51:47,899 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-21 19:51:47,899 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:51:47,899 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:51:47,899 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-21 19:51:47,899 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-21 19:51:47,900 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-21 19:51:47,900 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 19:51:47,972 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:51:47,974 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:51:48,175 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:51:48,243 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:51:48,243 INFO L308 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-21 19:51:48,245 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:51:48 BoogieIcfgContainer [2023-11-21 19:51:48,246 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:51:48,248 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:51:48,249 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:51:48,253 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:51:48,253 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:51:47" (1/3) ... [2023-11-21 19:51:48,254 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d3a03fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:51:48, skipping insertion in model container [2023-11-21 19:51:48,254 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:47" (2/3) ... [2023-11-21 19:51:48,255 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d3a03fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:51:48, skipping insertion in model container [2023-11-21 19:51:48,255 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:51:48" (3/3) ... [2023-11-21 19:51:48,257 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_partial_init_ground.i [2023-11-21 19:51:48,279 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:51:48,279 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:51:48,325 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:51:48,331 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;@2b4e0673, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:51:48,331 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:51:48,335 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 19:51:48,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-21 19:51:48,340 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:48,340 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:48,341 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:48,346 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:48,346 INFO L85 PathProgramCache]: Analyzing trace with hash -1629969816, now seen corresponding path program 1 times [2023-11-21 19:51:48,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:48,358 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484662474] [2023-11-21 19:51:48,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:48,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:48,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:48,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:48,717 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:48,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484662474] [2023-11-21 19:51:48,718 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484662474] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:48,718 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:51:48,718 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:51:48,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017529139] [2023-11-21 19:51:48,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:48,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:51:48,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:48,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:51:48,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:51:48,762 INFO L87 Difference]: Start difference. First operand has 16 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:48,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:48,824 INFO L93 Difference]: Finished difference Result 32 states and 45 transitions. [2023-11-21 19:51:48,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:51:48,827 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-21 19:51:48,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:48,837 INFO L225 Difference]: With dead ends: 32 [2023-11-21 19:51:48,837 INFO L226 Difference]: Without dead ends: 17 [2023-11-21 19:51:48,841 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 [2023-11-21 19:51:48,845 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:48,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:51:48,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-21 19:51:48,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-21 19:51:48,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 19:51:48,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-21 19:51:48,894 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 8 [2023-11-21 19:51:48,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:48,895 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-21 19:51:48,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:48,895 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-21 19:51:48,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-21 19:51:48,896 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:48,896 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:48,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:51:48,897 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:48,898 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:48,899 INFO L85 PathProgramCache]: Analyzing trace with hash 761335963, now seen corresponding path program 1 times [2023-11-21 19:51:48,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:48,899 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534785016] [2023-11-21 19:51:48,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:48,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:48,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:49,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:51:49,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:49,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534785016] [2023-11-21 19:51:49,108 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534785016] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:49,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814701852] [2023-11-21 19:51:49,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:49,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:49,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:49,111 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:49,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:51:49,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:49,270 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 19:51:49,278 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:49,357 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:51:49,357 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:49,386 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:51:49,387 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1814701852] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:49,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [154943885] [2023-11-21 19:51:49,426 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-21 19:51:49,426 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:49,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:51:49,438 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:51:49,439 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:51:50,505 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-11-21 19:51:50,533 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:51:54,304 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '156#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-21 19:51:54,305 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:51:54,305 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:54,306 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-21 19:51:54,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494083293] [2023-11-21 19:51:54,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:54,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:51:54,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:54,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:51:54,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=119, Unknown=2, NotChecked=0, Total=156 [2023-11-21 19:51:54,310 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:54,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:54,386 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2023-11-21 19:51:54,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:51:54,387 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-21 19:51:54,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:54,388 INFO L225 Difference]: With dead ends: 37 [2023-11-21 19:51:54,388 INFO L226 Difference]: Without dead ends: 23 [2023-11-21 19:51:54,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=35, Invalid=119, Unknown=2, NotChecked=0, Total=156 [2023-11-21 19:51:54,392 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:54,393 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:54,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-21 19:51:54,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-21 19:51:54,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 19:51:54,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2023-11-21 19:51:54,401 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 10 [2023-11-21 19:51:54,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:54,401 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2023-11-21 19:51:54,402 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:54,402 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2023-11-21 19:51:54,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-21 19:51:54,403 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:54,403 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:54,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:54,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:54,633 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:54,633 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:54,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1625783208, now seen corresponding path program 2 times [2023-11-21 19:51:54,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:54,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550300661] [2023-11-21 19:51:54,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:54,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:54,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:54,979 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-21 19:51:54,979 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:54,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550300661] [2023-11-21 19:51:54,981 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550300661] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:54,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731184130] [2023-11-21 19:51:54,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:51:54,985 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:54,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:54,989 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:55,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:51:55,111 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-21 19:51:55,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:51:55,113 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 19:51:55,115 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:55,137 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-21 19:51:55,137 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:55,238 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-21 19:51:55,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731184130] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:55,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1096246706] [2023-11-21 19:51:55,242 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-21 19:51:55,242 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:55,243 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:51:55,243 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:51:55,244 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:51:55,711 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-11-21 19:51:55,731 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:51:59,897 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '362#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-21 19:51:59,897 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:51:59,898 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:59,898 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-21 19:51:59,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216469919] [2023-11-21 19:51:59,898 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:59,899 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-21 19:51:59,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:59,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-21 19:51:59,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=248, Unknown=2, NotChecked=0, Total=342 [2023-11-21 19:51:59,901 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:52:00,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:52:00,021 INFO L93 Difference]: Finished difference Result 52 states and 71 transitions. [2023-11-21 19:52:00,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-21 19:52:00,022 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-21 19:52:00,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:52:00,026 INFO L225 Difference]: With dead ends: 52 [2023-11-21 19:52:00,026 INFO L226 Difference]: Without dead ends: 35 [2023-11-21 19:52:00,027 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=92, Invalid=248, Unknown=2, NotChecked=0, Total=342 [2023-11-21 19:52:00,032 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:52:00,038 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 55 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:52:00,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-21 19:52:00,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-11-21 19:52:00,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 19:52:00,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2023-11-21 19:52:00,056 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 16 [2023-11-21 19:52:00,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:52:00,060 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2023-11-21 19:52:00,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:52:00,061 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2023-11-21 19:52:00,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-21 19:52:00,063 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:52:00,064 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:52:00,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:52:00,280 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:52:00,281 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:52:00,281 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:52:00,282 INFO L85 PathProgramCache]: Analyzing trace with hash -487711352, now seen corresponding path program 3 times [2023-11-21 19:52:00,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:52:00,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614903036] [2023-11-21 19:52:00,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:52:00,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:52:00,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:52:00,830 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-11-21 19:52:00,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:52:00,831 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614903036] [2023-11-21 19:52:00,831 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614903036] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:52:00,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [920939684] [2023-11-21 19:52:00,832 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:52:00,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:52:00,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:52:00,834 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:52:00,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:52:01,034 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:52:01,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:52:01,038 INFO L262 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-21 19:52:01,048 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:52:01,095 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-11-21 19:52:01,096 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:52:01,453 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-11-21 19:52:01,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [920939684] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:52:01,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1693866922] [2023-11-21 19:52:01,457 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-21 19:52:01,457 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:52:01,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:52:01,458 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:52:01,458 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:52:01,831 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-11-21 19:52:01,846 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:52:06,185 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '706#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-21 19:52:06,186 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:52:06,186 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:52:06,186 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-21 19:52:06,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19116789] [2023-11-21 19:52:06,186 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:52:06,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-21 19:52:06,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:52:06,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-21 19:52:06,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=614, Unknown=2, NotChecked=0, Total=930 [2023-11-21 19:52:06,189 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:52:06,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:52:06,437 INFO L93 Difference]: Finished difference Result 82 states and 113 transitions. [2023-11-21 19:52:06,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-21 19:52:06,438 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2023-11-21 19:52:06,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:52:06,440 INFO L225 Difference]: With dead ends: 82 [2023-11-21 19:52:06,440 INFO L226 Difference]: Without dead ends: 59 [2023-11-21 19:52:06,442 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=314, Invalid=614, Unknown=2, NotChecked=0, Total=930 [2023-11-21 19:52:06,443 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:52:06,444 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:52:06,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-21 19:52:06,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2023-11-21 19:52:06,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 55 states have internal predecessors, (59), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 19:52:06,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 63 transitions. [2023-11-21 19:52:06,456 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 63 transitions. Word has length 28 [2023-11-21 19:52:06,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:52:06,456 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 63 transitions. [2023-11-21 19:52:06,457 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:52:06,457 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 63 transitions. [2023-11-21 19:52:06,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-11-21 19:52:06,459 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:52:06,460 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:52:06,484 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-21 19:52:06,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:52:06,684 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:52:06,684 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:52:06,685 INFO L85 PathProgramCache]: Analyzing trace with hash 1925937480, now seen corresponding path program 4 times [2023-11-21 19:52:06,685 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:52:06,685 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362679093] [2023-11-21 19:52:06,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:52:06,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:52:06,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:52:08,035 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-11-21 19:52:08,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:52:08,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362679093] [2023-11-21 19:52:08,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1362679093] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:52:08,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596303797] [2023-11-21 19:52:08,036 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:52:08,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:52:08,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:52:08,041 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:52:08,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:52:08,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:52:08,298 INFO L262 TraceCheckSpWp]: Trace formula consists of 533 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-21 19:52:08,306 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:52:08,383 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-11-21 19:52:08,383 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:52:09,559 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-11-21 19:52:09,559 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596303797] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:52:09,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1585636680] [2023-11-21 19:52:09,562 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-21 19:52:09,563 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:52:09,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:52:09,563 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:52:09,563 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:52:09,859 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-11-21 19:52:09,871 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:52:14,332 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1326#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-21 19:52:14,333 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:52:14,333 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:52:14,333 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2023-11-21 19:52:14,333 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891590107] [2023-11-21 19:52:14,333 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:52:14,334 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-11-21 19:52:14,334 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:52:14,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-11-21 19:52:14,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1195, Invalid=1883, Unknown=2, NotChecked=0, Total=3080 [2023-11-21 19:52:14,339 INFO L87 Difference]: Start difference. First operand 59 states and 63 transitions. Second operand has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:52:14,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:52:14,793 INFO L93 Difference]: Finished difference Result 142 states and 197 transitions. [2023-11-21 19:52:14,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-11-21 19:52:14,794 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2023-11-21 19:52:14,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:52:14,796 INFO L225 Difference]: With dead ends: 142 [2023-11-21 19:52:14,796 INFO L226 Difference]: Without dead ends: 107 [2023-11-21 19:52:14,799 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 579 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=1195, Invalid=1883, Unknown=2, NotChecked=0, Total=3080 [2023-11-21 19:52:14,800 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 19:52:14,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 55 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 19:52:14,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-11-21 19:52:14,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2023-11-21 19:52:14,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 103 states have (on average 1.0388349514563107) internal successors, (107), 103 states have internal predecessors, (107), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 19:52:14,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 111 transitions. [2023-11-21 19:52:14,818 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 111 transitions. Word has length 52 [2023-11-21 19:52:14,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:52:14,819 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 111 transitions. [2023-11-21 19:52:14,819 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:52:14,820 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 111 transitions. [2023-11-21 19:52:14,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2023-11-21 19:52:14,824 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:52:14,825 INFO L195 NwaCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:52:14,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:52:15,045 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:52:15,046 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:52:15,046 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:52:15,046 INFO L85 PathProgramCache]: Analyzing trace with hash 633245896, now seen corresponding path program 5 times [2023-11-21 19:52:15,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:52:15,047 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669091214] [2023-11-21 19:52:15,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:52:15,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:52:15,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:52:19,324 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-11-21 19:52:19,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:52:19,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669091214] [2023-11-21 19:52:19,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669091214] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:52:19,325 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264745251] [2023-11-21 19:52:19,325 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:52:19,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:52:19,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:52:19,329 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:52:19,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_322c2c4e-913e-4211-8cb4-29e45c1be002/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process