./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/neural-networks/vdp_7_safe.c-amalgamation.i --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_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/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_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/neural-networks/vdp_7_safe.c-amalgamation.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/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_0f32c512-c6ee-4dea-81f5-f4dfe8609290/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 cbfe4af9112c1518d3c4cabfb50a7350e22df936bd3147b9a0954f40d0134683 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:33:36,426 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:33:36,491 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 14:33:36,496 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:33:36,497 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:33:36,521 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:33:36,522 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:33:36,522 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:33:36,523 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:33:36,523 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:33:36,524 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:33:36,524 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:33:36,525 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:33:36,525 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:33:36,526 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:33:36,526 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:33:36,527 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:33:36,527 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:33:36,528 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:33:36,528 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:33:36,529 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:33:36,529 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:33:36,530 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:33:36,531 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:33:36,531 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 14:33:36,531 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:33:36,532 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 14:33:36,532 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:33:36,533 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:33:36,533 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:33:36,533 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:33:36,534 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 14:33:36,534 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:33:36,534 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:33:36,535 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:33:36,535 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:33:36,535 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:33:36,535 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:33:36,536 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:33:36,536 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:33:36,536 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:33:36,536 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:33:36,537 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:33:36,537 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:33:36,537 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:33:36,537 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:33:36,537 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:33:36,537 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_0f32c512-c6ee-4dea-81f5-f4dfe8609290/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cbfe4af9112c1518d3c4cabfb50a7350e22df936bd3147b9a0954f40d0134683 [2023-12-02 14:33:36,766 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:33:36,786 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:33:36,789 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:33:36,790 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:33:36,790 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:33:36,792 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/neural-networks/vdp_7_safe.c-amalgamation.i [2023-12-02 14:33:39,585 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:33:39,879 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:33:39,880 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/sv-benchmarks/c/neural-networks/vdp_7_safe.c-amalgamation.i [2023-12-02 14:33:39,904 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/data/50831465d/0d7861177f5e4376a74305bc2b4f3c8f/FLAGc12aba249 [2023-12-02 14:33:39,916 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/data/50831465d/0d7861177f5e4376a74305bc2b4f3c8f [2023-12-02 14:33:39,918 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:33:39,920 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:33:39,921 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:33:39,921 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:33:39,926 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:33:39,926 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:33:39" (1/1) ... [2023-12-02 14:33:39,928 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@239209d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:39, skipping insertion in model container [2023-12-02 14:33:39,928 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:33:39" (1/1) ... [2023-12-02 14:33:40,002 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:33:40,679 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/sv-benchmarks/c/neural-networks/vdp_7_safe.c-amalgamation.i[63640,63653] [2023-12-02 14:33:40,798 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:33:40,862 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:33:40,905 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_0f32c512-c6ee-4dea-81f5-f4dfe8609290/sv-benchmarks/c/neural-networks/vdp_7_safe.c-amalgamation.i[63640,63653] [2023-12-02 14:33:40,966 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:33:41,239 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:33:41,239 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41 WrapperNode [2023-12-02 14:33:41,239 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:33:41,240 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:33:41,240 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:33:41,241 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:33:41,248 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,294 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,394 INFO L138 Inliner]: procedures = 619, calls = 1412, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 1680 [2023-12-02 14:33:41,394 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:33:41,395 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:33:41,395 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:33:41,395 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:33:41,405 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,406 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,421 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,422 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,467 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,473 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,479 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,488 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,497 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:33:41,498 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:33:41,498 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:33:41,498 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:33:41,499 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (1/1) ... [2023-12-02 14:33:41,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:33:41,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:33:41,528 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:33:41,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:33:41,563 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2023-12-02 14:33:41,563 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 14:33:41,563 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~real [2023-12-02 14:33:41,563 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2023-12-02 14:33:41,563 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:33:41,563 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:33:41,564 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:33:41,564 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 14:33:41,564 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:33:41,717 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:33:41,719 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:33:43,333 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:33:43,846 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:33:43,846 INFO L309 CfgBuilder]: Removed 11 assume(true) statements. [2023-12-02 14:33:43,847 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:33:43 BoogieIcfgContainer [2023-12-02 14:33:43,848 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:33:43,850 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:33:43,850 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:33:43,854 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:33:43,854 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:33:39" (1/3) ... [2023-12-02 14:33:43,854 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22923e1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:33:43, skipping insertion in model container [2023-12-02 14:33:43,855 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:33:41" (2/3) ... [2023-12-02 14:33:43,855 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22923e1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:33:43, skipping insertion in model container [2023-12-02 14:33:43,855 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:33:43" (3/3) ... [2023-12-02 14:33:43,856 INFO L112 eAbstractionObserver]: Analyzing ICFG vdp_7_safe.c-amalgamation.i [2023-12-02 14:33:43,875 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:33:43,875 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 14:33:43,923 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:33:43,930 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;@778b9247, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:33:43,931 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 14:33:43,935 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 16 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 14:33:43,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 14:33:43,941 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:33:43,942 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:33:43,943 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:33:43,947 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:33:43,948 INFO L85 PathProgramCache]: Analyzing trace with hash -1277788918, now seen corresponding path program 1 times [2023-12-02 14:33:43,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:33:43,958 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438712134] [2023-12-02 14:33:43,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:43,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:33:44,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:44,680 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 14:33:44,680 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:33:44,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438712134] [2023-12-02 14:33:44,681 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438712134] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:33:44,681 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:33:44,681 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 14:33:44,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233495622] [2023-12-02 14:33:44,683 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:33:44,687 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:33:44,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:33:44,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:33:44,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:33:44,714 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 16 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) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 14:33:44,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:33:44,887 INFO L93 Difference]: Finished difference Result 30 states and 49 transitions. [2023-12-02 14:33:44,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:33:44,890 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 14:33:44,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:33:44,897 INFO L225 Difference]: With dead ends: 30 [2023-12-02 14:33:44,897 INFO L226 Difference]: Without dead ends: 16 [2023-12-02 14:33:44,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 14:33:44,902 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:33:44,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:33:44,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-12-02 14:33:44,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-12-02 14:33:44,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 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 14:33:44,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 26 transitions. [2023-12-02 14:33:44,927 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 26 transitions. Word has length 8 [2023-12-02 14:33:44,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:33:44,928 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 26 transitions. [2023-12-02 14:33:44,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 14:33:44,928 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 26 transitions. [2023-12-02 14:33:44,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 14:33:44,928 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:33:44,929 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:33:44,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 14:33:44,929 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:33:44,930 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:33:44,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1709586107, now seen corresponding path program 1 times [2023-12-02 14:33:44,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:33:44,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199266126] [2023-12-02 14:33:44,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:44,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:33:45,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:45,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:33:45,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:33:45,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199266126] [2023-12-02 14:33:45,409 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199266126] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:33:45,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175080941] [2023-12-02 14:33:45,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:45,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:33:45,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:33:45,413 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:33:45,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:33:46,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:46,045 INFO L262 TraceCheckSpWp]: Trace formula consists of 1847 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 14:33:46,054 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:33:46,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:33:46,083 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:33:46,098 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 14:33:46,098 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175080941] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:33:46,099 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:33:46,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2023-12-02 14:33:46,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076772833] [2023-12-02 14:33:46,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:33:46,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:33:46,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:33:46,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:33:46,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:33:46,102 INFO L87 Difference]: Start difference. First operand 16 states and 26 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:33:46,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:33:46,264 INFO L93 Difference]: Finished difference Result 23 states and 36 transitions. [2023-12-02 14:33:46,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:33:46,265 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 14:33:46,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:33:46,266 INFO L225 Difference]: With dead ends: 23 [2023-12-02 14:33:46,266 INFO L226 Difference]: Without dead ends: 17 [2023-12-02 14:33:46,267 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:33:46,268 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:33:46,269 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:33:46,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-12-02 14:33:46,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-12-02 14:33:46,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 states have internal predecessors, (27), 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 14:33:46,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 27 transitions. [2023-12-02 14:33:46,274 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 27 transitions. Word has length 9 [2023-12-02 14:33:46,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:33:46,274 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 27 transitions. [2023-12-02 14:33:46,275 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:33:46,275 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 27 transitions. [2023-12-02 14:33:46,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 14:33:46,275 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:33:46,276 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:33:46,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:33:46,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-02 14:33:46,477 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:33:46,477 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:33:46,478 INFO L85 PathProgramCache]: Analyzing trace with hash 1473190729, now seen corresponding path program 1 times [2023-12-02 14:33:46,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:33:46,478 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2017893186] [2023-12-02 14:33:46,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:46,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:33:46,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:46,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 14:33:46,808 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:33:46,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2017893186] [2023-12-02 14:33:46,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2017893186] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:33:46,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [202676191] [2023-12-02 14:33:46,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:46,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:33:46,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:33:46,811 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:33:46,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:33:47,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:47,347 INFO L262 TraceCheckSpWp]: Trace formula consists of 1859 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-02 14:33:47,350 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:33:47,366 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:33:47,366 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:33:47,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [202676191] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:33:47,367 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:33:47,367 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-12-02 14:33:47,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029208238] [2023-12-02 14:33:47,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:33:47,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:33:47,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:33:47,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:33:47,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:33:47,369 INFO L87 Difference]: Start difference. First operand 17 states and 27 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 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 14:33:47,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:33:47,488 INFO L93 Difference]: Finished difference Result 33 states and 53 transitions. [2023-12-02 14:33:47,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:33:47,490 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 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 14:33:47,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:33:47,491 INFO L225 Difference]: With dead ends: 33 [2023-12-02 14:33:47,491 INFO L226 Difference]: Without dead ends: 20 [2023-12-02 14:33:47,491 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:33:47,493 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:33:47,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 14 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:33:47,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-12-02 14:33:47,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2023-12-02 14:33:47,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 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 14:33:47,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 28 transitions. [2023-12-02 14:33:47,499 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 28 transitions. Word has length 10 [2023-12-02 14:33:47,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:33:47,499 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 28 transitions. [2023-12-02 14:33:47,499 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 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 14:33:47,500 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 28 transitions. [2023-12-02 14:33:47,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-12-02 14:33:47,500 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:33:47,500 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:33:47,508 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:33:47,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-12-02 14:33:47,701 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:33:47,702 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:33:47,702 INFO L85 PathProgramCache]: Analyzing trace with hash 984995742, now seen corresponding path program 1 times [2023-12-02 14:33:47,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:33:47,702 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039985355] [2023-12-02 14:33:47,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:47,703 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:33:47,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:48,131 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:33:48,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:33:48,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039985355] [2023-12-02 14:33:48,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039985355] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:33:48,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839021290] [2023-12-02 14:33:48,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:48,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:33:48,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:33:48,134 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:33:48,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:33:48,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:48,684 INFO L262 TraceCheckSpWp]: Trace formula consists of 1865 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 14:33:48,688 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:33:48,722 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:33:48,722 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:33:48,737 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 14:33:48,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839021290] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:33:48,738 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:33:48,738 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 7 [2023-12-02 14:33:48,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229495485] [2023-12-02 14:33:48,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:33:48,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:33:48,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:33:48,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:33:48,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:33:48,740 INFO L87 Difference]: Start difference. First operand 18 states and 28 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 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 14:33:48,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:33:48,894 INFO L93 Difference]: Finished difference Result 27 states and 41 transitions. [2023-12-02 14:33:48,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:33:48,895 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 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) Word has length 12 [2023-12-02 14:33:48,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:33:48,896 INFO L225 Difference]: With dead ends: 27 [2023-12-02 14:33:48,896 INFO L226 Difference]: Without dead ends: 19 [2023-12-02 14:33:48,896 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:33:48,897 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:33:48,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:33:48,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-12-02 14:33:48,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-12-02 14:33:48,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 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 14:33:48,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 29 transitions. [2023-12-02 14:33:48,903 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 29 transitions. Word has length 12 [2023-12-02 14:33:48,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:33:48,903 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 29 transitions. [2023-12-02 14:33:48,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 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 14:33:48,903 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 29 transitions. [2023-12-02 14:33:48,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 14:33:48,904 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:33:48,904 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:33:48,914 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:33:49,104 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-12-02 14:33:49,105 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:33:49,105 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:33:49,105 INFO L85 PathProgramCache]: Analyzing trace with hash 1193656409, now seen corresponding path program 1 times [2023-12-02 14:33:49,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:33:49,106 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636362636] [2023-12-02 14:33:49,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:49,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:33:49,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:49,511 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 14:33:49,511 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:33:49,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636362636] [2023-12-02 14:33:49,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636362636] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:33:49,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221205188] [2023-12-02 14:33:49,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:49,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:33:49,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:33:49,513 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:33:49,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:33:50,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:50,052 INFO L262 TraceCheckSpWp]: Trace formula consists of 1871 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 14:33:50,055 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:33:50,077 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 14:33:50,077 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:33:50,091 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 14:33:50,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221205188] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:33:50,092 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:33:50,092 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 7 [2023-12-02 14:33:50,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757082651] [2023-12-02 14:33:50,092 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:33:50,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:33:50,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:33:50,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:33:50,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:33:50,094 INFO L87 Difference]: Start difference. First operand 19 states and 29 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 14:33:50,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:33:50,219 INFO L93 Difference]: Finished difference Result 23 states and 33 transitions. [2023-12-02 14:33:50,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:33:50,220 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 14 [2023-12-02 14:33:50,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:33:50,220 INFO L225 Difference]: With dead ends: 23 [2023-12-02 14:33:50,221 INFO L226 Difference]: Without dead ends: 20 [2023-12-02 14:33:50,221 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:33:50,222 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:33:50,223 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:33:50,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-12-02 14:33:50,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-12-02 14:33:50,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 19 states have internal predecessors, (30), 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 14:33:50,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 30 transitions. [2023-12-02 14:33:50,227 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 30 transitions. Word has length 14 [2023-12-02 14:33:50,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:33:50,228 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 30 transitions. [2023-12-02 14:33:50,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 14:33:50,228 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 30 transitions. [2023-12-02 14:33:50,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-12-02 14:33:50,229 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:33:50,229 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:33:50,235 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 14:33:50,429 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:33:50,429 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:33:50,430 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:33:50,430 INFO L85 PathProgramCache]: Analyzing trace with hash 212493954, now seen corresponding path program 1 times [2023-12-02 14:33:50,430 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:33:50,430 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961635961] [2023-12-02 14:33:50,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:50,430 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:33:50,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:50,869 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 14:33:50,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:33:50,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961635961] [2023-12-02 14:33:50,869 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961635961] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:33:50,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808294717] [2023-12-02 14:33:50,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:33:50,870 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:33:50,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:33:50,871 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:33:50,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:33:51,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:33:51,375 INFO L262 TraceCheckSpWp]: Trace formula consists of 1877 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 14:33:51,378 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:33:51,387 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 14:33:51,387 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:33:51,408 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 14:33:51,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808294717] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:33:51,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [678883936] [2023-12-02 14:33:51,427 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-12-02 14:33:51,428 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:33:51,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:33:51,436 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:33:51,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:34:37,978 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:36:08,052 WARN L293 SmtUtils]: Spent 1.49m on a formula simplification. DAG size of input: 2912 DAG size of output: 2908 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:37:39,591 WARN L293 SmtUtils]: Spent 1.51m on a formula simplification. DAG size of input: 2914 DAG size of output: 2910 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:37:39,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [678883936] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:37:39,599 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:37:39,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4, 4] total 9 [2023-12-02 14:37:39,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766686942] [2023-12-02 14:37:39,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:37:39,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:37:39,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:39,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:37:39,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:37:39,601 INFO L87 Difference]: Start difference. First operand 20 states and 30 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 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 14:37:42,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:42,874 INFO L93 Difference]: Finished difference Result 40 states and 62 transitions. [2023-12-02 14:37:42,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:37:42,875 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 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 16 [2023-12-02 14:37:42,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:42,875 INFO L225 Difference]: With dead ends: 40 [2023-12-02 14:37:42,875 INFO L226 Difference]: Without dead ends: 22 [2023-12-02 14:37:42,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 181.6s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:37:42,876 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:42,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 12 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 39 Invalid, 1 Unknown, 0 Unchecked, 3.2s Time] [2023-12-02 14:37:42,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-12-02 14:37:42,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2023-12-02 14:37:42,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:37:42,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 31 transitions. [2023-12-02 14:37:42,894 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 31 transitions. Word has length 16 [2023-12-02 14:37:42,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:42,894 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 31 transitions. [2023-12-02 14:37:42,894 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 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 14:37:42,894 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 31 transitions. [2023-12-02 14:37:42,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 14:37:42,895 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:42,895 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:37:42,902 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 14:37:43,095 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 14:37:43,095 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:43,096 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:43,096 INFO L85 PathProgramCache]: Analyzing trace with hash -1009846422, now seen corresponding path program 1 times [2023-12-02 14:37:43,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:43,096 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964355613] [2023-12-02 14:37:43,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:43,096 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:43,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:43,466 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:37:43,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:43,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964355613] [2023-12-02 14:37:43,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964355613] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:43,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8751519] [2023-12-02 14:37:43,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:43,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:43,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:43,468 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:43,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:37:43,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:43,969 INFO L262 TraceCheckSpWp]: Trace formula consists of 1891 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 14:37:43,972 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:44,009 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 14:37:44,009 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:37:44,037 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:37:44,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8751519] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:44,037 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:37:44,037 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 6] total 10 [2023-12-02 14:37:44,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603278285] [2023-12-02 14:37:44,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:37:44,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:37:44,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:44,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:37:44,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:37:44,040 INFO L87 Difference]: Start difference. First operand 21 states and 31 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 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 14:37:44,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:44,209 INFO L93 Difference]: Finished difference Result 34 states and 51 transitions. [2023-12-02 14:37:44,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:37:44,210 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 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 18 [2023-12-02 14:37:44,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:44,210 INFO L225 Difference]: With dead ends: 34 [2023-12-02 14:37:44,210 INFO L226 Difference]: Without dead ends: 22 [2023-12-02 14:37:44,211 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:37:44,212 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:44,212 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 19 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:37:44,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-12-02 14:37:44,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-12-02 14:37:44,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 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 14:37:44,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2023-12-02 14:37:44,236 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 18 [2023-12-02 14:37:44,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:44,236 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2023-12-02 14:37:44,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 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 14:37:44,237 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2023-12-02 14:37:44,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 14:37:44,237 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:44,237 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:37:44,245 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:37:44,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 14:37:44,438 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:44,438 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:44,439 INFO L85 PathProgramCache]: Analyzing trace with hash -2022222140, now seen corresponding path program 1 times [2023-12-02 14:37:44,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:44,439 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15129860] [2023-12-02 14:37:44,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:44,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:44,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:44,815 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 14:37:44,816 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:44,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15129860] [2023-12-02 14:37:44,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [15129860] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:44,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1038835294] [2023-12-02 14:37:44,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:44,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:44,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:44,818 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:44,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:37:45,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:45,329 INFO L262 TraceCheckSpWp]: Trace formula consists of 1905 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 14:37:45,331 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:45,364 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 14:37:45,364 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:37:45,385 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:37:45,385 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1038835294] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:45,385 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:37:45,385 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 6] total 10 [2023-12-02 14:37:45,385 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040478702] [2023-12-02 14:37:45,385 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:37:45,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:37:45,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:45,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:37:45,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:37:45,386 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 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 14:37:45,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:45,514 INFO L93 Difference]: Finished difference Result 36 states and 53 transitions. [2023-12-02 14:37:45,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:37:45,515 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 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) Word has length 20 [2023-12-02 14:37:45,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:45,515 INFO L225 Difference]: With dead ends: 36 [2023-12-02 14:37:45,515 INFO L226 Difference]: Without dead ends: 23 [2023-12-02 14:37:45,516 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:37:45,516 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:45,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:37:45,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-12-02 14:37:45,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-12-02 14:37:45,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 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 14:37:45,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 33 transitions. [2023-12-02 14:37:45,536 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 33 transitions. Word has length 20 [2023-12-02 14:37:45,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:45,536 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 33 transitions. [2023-12-02 14:37:45,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 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 14:37:45,537 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 33 transitions. [2023-12-02 14:37:45,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 14:37:45,537 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:45,537 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:37:45,546 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 14:37:45,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 14:37:45,738 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:45,739 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:45,739 INFO L85 PathProgramCache]: Analyzing trace with hash -104208969, now seen corresponding path program 1 times [2023-12-02 14:37:45,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:45,739 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906678625] [2023-12-02 14:37:45,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:45,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:45,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:46,043 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 14:37:46,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:46,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906678625] [2023-12-02 14:37:46,044 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906678625] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:46,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624910844] [2023-12-02 14:37:46,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:46,044 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:46,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:46,045 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:46,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 14:37:46,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:46,542 INFO L262 TraceCheckSpWp]: Trace formula consists of 1910 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 14:37:46,546 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:46,554 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 14:37:46,554 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:37:46,573 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 14:37:46,573 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1624910844] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:37:46,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [305405640] [2023-12-02 14:37:46,576 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:37:46,576 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:37:46,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:37:46,576 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:37:46,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:38:41,806 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:40:15,611 WARN L293 SmtUtils]: Spent 1.55m on a formula simplification. DAG size of input: 2912 DAG size of output: 2908 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:41:35,898 WARN L293 SmtUtils]: Spent 1.33m on a formula simplification. DAG size of input: 2914 DAG size of output: 2910 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:43:03,521 WARN L293 SmtUtils]: Spent 1.45m on a formula simplification. DAG size of input: 2916 DAG size of output: 2912 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:43:03,530 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [305405640] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:43:03,530 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:43:03,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4, 4] total 10 [2023-12-02 14:43:03,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430380147] [2023-12-02 14:43:03,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:43:03,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:43:03,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:43:03,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:43:03,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:43:03,532 INFO L87 Difference]: Start difference. First operand 23 states and 33 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 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 14:43:06,513 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:43:12,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:43:12,315 INFO L93 Difference]: Finished difference Result 45 states and 67 transitions. [2023-12-02 14:43:12,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:43:12,317 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 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 21 [2023-12-02 14:43:12,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:43:12,317 INFO L225 Difference]: With dead ends: 45 [2023-12-02 14:43:12,318 INFO L226 Difference]: Without dead ends: 25 [2023-12-02 14:43:12,318 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 261.7s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:43:12,318 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:43:12,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 24 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 8.7s Time] [2023-12-02 14:43:12,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-12-02 14:43:12,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2023-12-02 14:43:12,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 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 14:43:12,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 34 transitions. [2023-12-02 14:43:12,356 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 34 transitions. Word has length 21 [2023-12-02 14:43:12,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:43:12,356 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 34 transitions. [2023-12-02 14:43:12,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 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 14:43:12,357 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 34 transitions. [2023-12-02 14:43:12,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-12-02 14:43:12,357 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:43:12,357 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:43:12,364 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 14:43:12,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-12-02 14:43:12,558 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:43:12,558 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:43:12,558 INFO L85 PathProgramCache]: Analyzing trace with hash 1175804345, now seen corresponding path program 1 times [2023-12-02 14:43:12,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:43:12,558 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111799423] [2023-12-02 14:43:12,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:12,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:43:12,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:12,850 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:43:12,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:43:12,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111799423] [2023-12-02 14:43:12,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111799423] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:43:12,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2008568457] [2023-12-02 14:43:12,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:12,851 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:43:12,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:43:12,851 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:43:12,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 14:43:13,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:13,242 INFO L262 TraceCheckSpWp]: Trace formula consists of 1915 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 14:43:13,245 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:43:13,271 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:43:13,271 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:43:13,290 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:43:13,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2008568457] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:43:13,290 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:43:13,290 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 6] total 10 [2023-12-02 14:43:13,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663778773] [2023-12-02 14:43:13,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:43:13,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:43:13,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:43:13,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:43:13,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:43:13,291 INFO L87 Difference]: Start difference. First operand 24 states and 34 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 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 14:43:13,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:43:13,433 INFO L93 Difference]: Finished difference Result 31 states and 44 transitions. [2023-12-02 14:43:13,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:43:13,434 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 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 22 [2023-12-02 14:43:13,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:43:13,434 INFO L225 Difference]: With dead ends: 31 [2023-12-02 14:43:13,435 INFO L226 Difference]: Without dead ends: 25 [2023-12-02 14:43:13,435 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:43:13,435 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:43:13,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:43:13,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-12-02 14:43:13,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-12-02 14:43:13,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 24 states have internal predecessors, (35), 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 14:43:13,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 35 transitions. [2023-12-02 14:43:13,473 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 35 transitions. Word has length 22 [2023-12-02 14:43:13,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:43:13,473 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 35 transitions. [2023-12-02 14:43:13,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 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 14:43:13,473 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 35 transitions. [2023-12-02 14:43:13,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 14:43:13,474 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:43:13,474 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:43:13,481 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 14:43:13,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 14:43:13,675 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:43:13,675 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:43:13,675 INFO L85 PathProgramCache]: Analyzing trace with hash 538192126, now seen corresponding path program 1 times [2023-12-02 14:43:13,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:43:13,675 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512860168] [2023-12-02 14:43:13,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:13,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:43:13,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:13,929 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 14:43:13,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:43:13,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512860168] [2023-12-02 14:43:13,929 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512860168] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:43:13,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295813151] [2023-12-02 14:43:13,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:13,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:43:13,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:43:13,930 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:43:13,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 14:43:14,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:14,451 INFO L262 TraceCheckSpWp]: Trace formula consists of 1929 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 14:43:14,454 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:43:14,483 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 14:43:14,483 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:43:14,505 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:43:14,506 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295813151] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:43:14,506 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:43:14,506 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 6] total 10 [2023-12-02 14:43:14,506 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373622831] [2023-12-02 14:43:14,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:43:14,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:43:14,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:43:14,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:43:14,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:43:14,507 INFO L87 Difference]: Start difference. First operand 25 states and 35 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 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 14:43:14,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:43:14,635 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2023-12-02 14:43:14,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:43:14,636 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 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 24 [2023-12-02 14:43:14,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:43:14,636 INFO L225 Difference]: With dead ends: 33 [2023-12-02 14:43:14,636 INFO L226 Difference]: Without dead ends: 26 [2023-12-02 14:43:14,637 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:43:14,637 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:43:14,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:43:14,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-12-02 14:43:14,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-12-02 14:43:14,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 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 14:43:14,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 36 transitions. [2023-12-02 14:43:14,672 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 36 transitions. Word has length 24 [2023-12-02 14:43:14,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:43:14,673 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 36 transitions. [2023-12-02 14:43:14,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 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 14:43:14,673 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 36 transitions. [2023-12-02 14:43:14,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 14:43:14,674 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:43:14,674 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:43:14,680 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 14:43:14,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 14:43:14,874 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:43:14,875 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:43:14,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1049888234, now seen corresponding path program 1 times [2023-12-02 14:43:14,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:43:14,875 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677324146] [2023-12-02 14:43:14,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:14,875 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:43:14,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:15,143 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:43:15,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:43:15,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677324146] [2023-12-02 14:43:15,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677324146] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:43:15,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999148777] [2023-12-02 14:43:15,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:15,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:43:15,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:43:15,145 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:43:15,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f32c512-c6ee-4dea-81f5-f4dfe8609290/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 14:43:15,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:15,585 INFO L262 TraceCheckSpWp]: Trace formula consists of 1934 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 14:43:15,588 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:43:15,594 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:43:15,594 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:43:15,610 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:43:15,610 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999148777] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:43:15,610 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2083289467] [2023-12-02 14:43:15,613 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 14:43:15,613 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:43:15,613 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:43:15,614 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:43:15,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:44:51,192 WARN L293 SmtUtils]: Spent 6.90s on a formula simplification. DAG size of input: 2934 DAG size of output: 2930 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2023-12-02 14:48:11,622 WARN L293 SmtUtils]: Spent 9.20s on a formula simplification that was a NOOP. DAG size: 2982 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm)