./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2018/Problem10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/config/AutomizerReach.xml -i ../../sv-benchmarks/c/eca-rers2018/Problem10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash aec1fafbe63132c51323898caadb7f7b777fc751b19e58e74eab1930ebd68833 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 20:58:35,058 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 20:58:35,153 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-21 20:58:35,158 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 20:58:35,159 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 20:58:35,184 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 20:58:35,185 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 20:58:35,185 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 20:58:35,186 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-21 20:58:35,187 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-21 20:58:35,187 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 20:58:35,188 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 20:58:35,189 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 20:58:35,189 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 20:58:35,190 INFO L153 SettingsManager]: * Use SBE=true [2023-11-21 20:58:35,190 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 20:58:35,191 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 20:58:35,191 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 20:58:35,192 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 20:58:35,193 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 20:58:35,193 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 20:58:35,194 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 20:58:35,194 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 20:58:35,195 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 20:58:35,195 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 20:58:35,196 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 20:58:35,196 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 20:58:35,197 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 20:58:35,197 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-21 20:58:35,198 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 20:58:35,198 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 20:58:35,198 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 20:58:35,199 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 20:58:35,199 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 20:58:35,200 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 20:58:35,200 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-21 20:58:35,200 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 20:58:35,200 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 20:58:35,201 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-21 20:58:35,201 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 20:58:35,201 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-21 20:58:35,201 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 20:58:35,202 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aec1fafbe63132c51323898caadb7f7b777fc751b19e58e74eab1930ebd68833 [2023-11-21 20:58:35,446 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 20:58:35,501 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 20:58:35,504 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 20:58:35,505 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 20:58:35,506 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 20:58:35,507 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/../../sv-benchmarks/c/eca-rers2018/Problem10.c [2023-11-21 20:58:38,785 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 20:58:39,229 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 20:58:39,230 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/sv-benchmarks/c/eca-rers2018/Problem10.c [2023-11-21 20:58:39,254 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/data/bd1a40149/ebd4c84af06d40cfabc7a4283d0b5681/FLAGcb2be8bf3 [2023-11-21 20:58:39,269 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/data/bd1a40149/ebd4c84af06d40cfabc7a4283d0b5681 [2023-11-21 20:58:39,272 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 20:58:39,274 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 20:58:39,276 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 20:58:39,276 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 20:58:39,289 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 20:58:39,290 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 08:58:39" (1/1) ... [2023-11-21 20:58:39,292 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74b6c453 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:39, skipping insertion in model container [2023-11-21 20:58:39,292 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 08:58:39" (1/1) ... [2023-11-21 20:58:39,378 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 20:58:39,556 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_6bf0f0d5-4864-422d-8c66-c97e47189e8d/sv-benchmarks/c/eca-rers2018/Problem10.c[778,791] [2023-11-21 20:58:39,564 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_6bf0f0d5-4864-422d-8c66-c97e47189e8d/sv-benchmarks/c/eca-rers2018/Problem10.c[817,830] [2023-11-21 20:58:40,255 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 20:58:40,276 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 20:58:40,291 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_6bf0f0d5-4864-422d-8c66-c97e47189e8d/sv-benchmarks/c/eca-rers2018/Problem10.c[778,791] [2023-11-21 20:58:40,291 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_6bf0f0d5-4864-422d-8c66-c97e47189e8d/sv-benchmarks/c/eca-rers2018/Problem10.c[817,830] [2023-11-21 20:58:40,417 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 20:58:40,546 INFO L206 MainTranslator]: Completed translation [2023-11-21 20:58:40,546 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40 WrapperNode [2023-11-21 20:58:40,546 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 20:58:40,548 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 20:58:40,548 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 20:58:40,548 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 20:58:40,560 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,584 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,679 INFO L138 Inliner]: procedures = 274, calls = 248, calls flagged for inlining = 144, calls inlined = 144, statements flattened = 866 [2023-11-21 20:58:40,680 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 20:58:40,681 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 20:58:40,681 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 20:58:40,681 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 20:58:40,695 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,695 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,703 INFO L184 PluginConnector]: Executing the observer HeapSplitter from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,725 INFO L187 HeapSplitter]: Split 2 memory accesses to 1 slices as follows [2] [2023-11-21 20:58:40,725 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,726 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,754 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,781 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,799 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,806 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,827 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 20:58:40,828 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 20:58:40,829 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 20:58:40,829 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 20:58:40,830 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (1/1) ... [2023-11-21 20:58:40,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 20:58:40,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:58:40,892 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 20:58:40,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6bf0f0d5-4864-422d-8c66-c97e47189e8d/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 20:58:40,943 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 20:58:40,944 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_a [2023-11-21 20:58:40,944 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_a [2023-11-21 20:58:40,944 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_b [2023-11-21 20:58:40,944 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_b [2023-11-21 20:58:40,946 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-21 20:58:40,947 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 20:58:40,948 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 20:58:41,098 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 20:58:41,100 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 20:58:42,278 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 20:58:44,767 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 20:58:44,767 INFO L308 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-21 20:58:44,769 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 08:58:44 BoogieIcfgContainer [2023-11-21 20:58:44,769 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 20:58:44,774 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 20:58:44,775 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 20:58:44,779 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 20:58:44,779 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 08:58:39" (1/3) ... [2023-11-21 20:58:44,780 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44799b2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 08:58:44, skipping insertion in model container [2023-11-21 20:58:44,780 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:58:40" (2/3) ... [2023-11-21 20:58:44,782 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44799b2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 08:58:44, skipping insertion in model container [2023-11-21 20:58:44,782 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 08:58:44" (3/3) ... [2023-11-21 20:58:44,785 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem10.c [2023-11-21 20:58:44,808 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 20:58:44,808 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-21 20:58:44,900 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 20:58:44,910 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=PETRI_NET, 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;@76fe02a0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 20:58:44,910 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-21 20:58:44,917 INFO L276 IsEmpty]: Start isEmpty. Operand has 312 states, 207 states have (on average 1.502415458937198) internal successors, (311), 209 states have internal predecessors, (311), 100 states have call successors, (100), 2 states have call predecessors, (100), 2 states have return successors, (100), 100 states have call predecessors, (100), 100 states have call successors, (100) [2023-11-21 20:58:44,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-21 20:58:44,926 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:58:44,927 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-21 20:58:44,928 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:58:44,936 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:58:44,937 INFO L85 PathProgramCache]: Analyzing trace with hash 1869905148, now seen corresponding path program 1 times [2023-11-21 20:58:44,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:58:44,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870614499] [2023-11-21 20:58:44,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:58:44,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:58:45,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:58:46,624 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:58:46,625 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:58:46,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870614499] [2023-11-21 20:58:46,626 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870614499] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:58:46,626 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:58:46,627 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:58:46,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669675657] [2023-11-21 20:58:46,630 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:58:46,635 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:58:46,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:58:46,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:58:46,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:46,685 INFO L87 Difference]: Start difference. First operand has 312 states, 207 states have (on average 1.502415458937198) internal successors, (311), 209 states have internal predecessors, (311), 100 states have call successors, (100), 2 states have call predecessors, (100), 2 states have return successors, (100), 100 states have call predecessors, (100), 100 states have call successors, (100) Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:47,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:58:47,431 INFO L93 Difference]: Finished difference Result 722 states and 1308 transitions. [2023-11-21 20:58:47,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:58:47,434 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-21 20:58:47,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:58:47,457 INFO L225 Difference]: With dead ends: 722 [2023-11-21 20:58:47,457 INFO L226 Difference]: Without dead ends: 405 [2023-11-21 20:58:47,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:47,473 INFO L413 NwaCegarLoop]: 288 mSDtfsCounter, 277 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 581 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-21 20:58:47,475 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [277 Valid, 581 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 339 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-21 20:58:47,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2023-11-21 20:58:47,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 298. [2023-11-21 20:58:47,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 196 states have (on average 1.8877551020408163) internal successors, (370), 295 states have internal predecessors, (370), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:47,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 470 transitions. [2023-11-21 20:58:47,555 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 470 transitions. Word has length 6 [2023-11-21 20:58:47,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:58:47,556 INFO L495 AbstractCegarLoop]: Abstraction has 298 states and 470 transitions. [2023-11-21 20:58:47,556 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:47,557 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 470 transitions. [2023-11-21 20:58:47,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-21 20:58:47,557 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:58:47,558 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:58:47,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 20:58:47,559 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:58:47,559 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:58:47,559 INFO L85 PathProgramCache]: Analyzing trace with hash 2131767786, now seen corresponding path program 1 times [2023-11-21 20:58:47,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:58:47,560 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859161339] [2023-11-21 20:58:47,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:58:47,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:58:47,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:58:49,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:58:49,951 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:58:49,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859161339] [2023-11-21 20:58:49,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1859161339] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:58:49,952 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:58:49,952 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:58:49,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179508408] [2023-11-21 20:58:49,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:58:49,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:58:49,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:58:49,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:58:49,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:49,961 INFO L87 Difference]: Start difference. First operand 298 states and 470 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:50,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:58:50,557 INFO L93 Difference]: Finished difference Result 300 states and 471 transitions. [2023-11-21 20:58:50,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:58:50,559 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-21 20:58:50,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:58:50,561 INFO L225 Difference]: With dead ends: 300 [2023-11-21 20:58:50,561 INFO L226 Difference]: Without dead ends: 296 [2023-11-21 20:58:50,562 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:50,563 INFO L413 NwaCegarLoop]: 293 mSDtfsCounter, 299 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-21 20:58:50,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [299 Valid, 296 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-21 20:58:50,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2023-11-21 20:58:50,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 296. [2023-11-21 20:58:50,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 196 states have (on average 1.8673469387755102) internal successors, (366), 293 states have internal predecessors, (366), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:50,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 464 transitions. [2023-11-21 20:58:50,610 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 464 transitions. Word has length 7 [2023-11-21 20:58:50,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:58:50,610 INFO L495 AbstractCegarLoop]: Abstraction has 296 states and 464 transitions. [2023-11-21 20:58:50,610 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:50,611 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 464 transitions. [2023-11-21 20:58:50,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-21 20:58:50,611 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:58:50,611 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:58:50,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 20:58:50,612 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:58:50,612 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:58:50,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1659581761, now seen corresponding path program 1 times [2023-11-21 20:58:50,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:58:50,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245342003] [2023-11-21 20:58:50,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:58:50,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:58:50,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:58:53,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:58:53,426 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:58:53,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245342003] [2023-11-21 20:58:53,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245342003] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:58:53,429 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:58:53,429 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:58:53,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977698478] [2023-11-21 20:58:53,430 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:58:53,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:58:53,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:58:53,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:58:53,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:53,435 INFO L87 Difference]: Start difference. First operand 296 states and 464 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:54,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:58:54,046 INFO L93 Difference]: Finished difference Result 298 states and 465 transitions. [2023-11-21 20:58:54,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:58:54,047 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-21 20:58:54,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:58:54,050 INFO L225 Difference]: With dead ends: 298 [2023-11-21 20:58:54,050 INFO L226 Difference]: Without dead ends: 295 [2023-11-21 20:58:54,050 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:54,052 INFO L413 NwaCegarLoop]: 248 mSDtfsCounter, 296 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 348 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-21 20:58:54,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [296 Valid, 251 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 348 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-21 20:58:54,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2023-11-21 20:58:54,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 295. [2023-11-21 20:58:54,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 196 states have (on average 1.8571428571428572) internal successors, (364), 292 states have internal predecessors, (364), 97 states have call successors, (97), 2 states have call predecessors, (97), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:54,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 461 transitions. [2023-11-21 20:58:54,080 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 461 transitions. Word has length 8 [2023-11-21 20:58:54,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:58:54,080 INFO L495 AbstractCegarLoop]: Abstraction has 295 states and 461 transitions. [2023-11-21 20:58:54,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:54,081 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 461 transitions. [2023-11-21 20:58:54,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-21 20:58:54,082 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:58:54,082 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:58:54,082 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-21 20:58:54,082 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:58:54,083 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:58:54,083 INFO L85 PathProgramCache]: Analyzing trace with hash 1402704265, now seen corresponding path program 1 times [2023-11-21 20:58:54,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:58:54,084 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151679853] [2023-11-21 20:58:54,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:58:54,084 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:58:54,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:58:55,364 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:58:55,365 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:58:55,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151679853] [2023-11-21 20:58:55,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151679853] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:58:55,366 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:58:55,366 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:58:55,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613099592] [2023-11-21 20:58:55,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:58:55,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:58:55,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:58:55,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:58:55,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:55,368 INFO L87 Difference]: Start difference. First operand 295 states and 461 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:55,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:58:55,919 INFO L93 Difference]: Finished difference Result 396 states and 571 transitions. [2023-11-21 20:58:55,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:58:55,919 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-21 20:58:55,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:58:55,922 INFO L225 Difference]: With dead ends: 396 [2023-11-21 20:58:55,922 INFO L226 Difference]: Without dead ends: 393 [2023-11-21 20:58:55,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:55,924 INFO L413 NwaCegarLoop]: 290 mSDtfsCounter, 264 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 594 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 20:58:55,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 594 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 20:58:55,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2023-11-21 20:58:55,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 295. [2023-11-21 20:58:55,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 196 states have (on average 1.8520408163265305) internal successors, (363), 292 states have internal predecessors, (363), 97 states have call successors, (97), 2 states have call predecessors, (97), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:55,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 460 transitions. [2023-11-21 20:58:55,960 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 460 transitions. Word has length 10 [2023-11-21 20:58:55,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:58:55,960 INFO L495 AbstractCegarLoop]: Abstraction has 295 states and 460 transitions. [2023-11-21 20:58:55,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:55,960 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 460 transitions. [2023-11-21 20:58:55,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-21 20:58:55,961 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:58:55,961 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:58:55,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-21 20:58:55,962 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:58:55,962 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:58:55,963 INFO L85 PathProgramCache]: Analyzing trace with hash 533469364, now seen corresponding path program 1 times [2023-11-21 20:58:55,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:58:55,963 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612840076] [2023-11-21 20:58:55,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:58:55,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:58:56,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:58:57,323 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:58:57,324 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:58:57,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612840076] [2023-11-21 20:58:57,325 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612840076] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:58:57,326 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:58:57,326 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:58:57,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144375981] [2023-11-21 20:58:57,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:58:57,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:58:57,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:58:57,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:58:57,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:57,328 INFO L87 Difference]: Start difference. First operand 295 states and 460 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:57,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:58:57,617 INFO L93 Difference]: Finished difference Result 299 states and 462 transitions. [2023-11-21 20:58:57,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:58:57,617 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-21 20:58:57,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:58:57,620 INFO L225 Difference]: With dead ends: 299 [2023-11-21 20:58:57,620 INFO L226 Difference]: Without dead ends: 290 [2023-11-21 20:58:57,620 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:57,621 INFO L413 NwaCegarLoop]: 273 mSDtfsCounter, 279 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 20:58:57,622 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [279 Valid, 455 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 20:58:57,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2023-11-21 20:58:57,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 288. [2023-11-21 20:58:57,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 196 states have (on average 1.780612244897959) internal successors, (349), 285 states have internal predecessors, (349), 90 states have call successors, (90), 2 states have call predecessors, (90), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:57,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 439 transitions. [2023-11-21 20:58:57,660 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 439 transitions. Word has length 11 [2023-11-21 20:58:57,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:58:57,660 INFO L495 AbstractCegarLoop]: Abstraction has 288 states and 439 transitions. [2023-11-21 20:58:57,661 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:57,661 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 439 transitions. [2023-11-21 20:58:57,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-21 20:58:57,662 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:58:57,662 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:58:57,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-21 20:58:57,663 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:58:57,663 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:58:57,663 INFO L85 PathProgramCache]: Analyzing trace with hash -643001906, now seen corresponding path program 1 times [2023-11-21 20:58:57,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:58:57,664 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160704470] [2023-11-21 20:58:57,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:58:57,664 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:58:57,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:58:59,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:58:59,282 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:58:59,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160704470] [2023-11-21 20:58:59,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160704470] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:58:59,282 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:58:59,283 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:58:59,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217344382] [2023-11-21 20:58:59,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:58:59,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:58:59,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:58:59,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:58:59,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:59,285 INFO L87 Difference]: Start difference. First operand 288 states and 439 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:59,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:58:59,807 INFO L93 Difference]: Finished difference Result 383 states and 542 transitions. [2023-11-21 20:58:59,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:58:59,808 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-21 20:58:59,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:58:59,812 INFO L225 Difference]: With dead ends: 383 [2023-11-21 20:58:59,813 INFO L226 Difference]: Without dead ends: 377 [2023-11-21 20:58:59,814 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:59,815 INFO L413 NwaCegarLoop]: 275 mSDtfsCounter, 244 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 548 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 20:58:59,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 548 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 20:58:59,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2023-11-21 20:58:59,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 288. [2023-11-21 20:58:59,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 196 states have (on average 1.7704081632653061) internal successors, (347), 285 states have internal predecessors, (347), 90 states have call successors, (90), 2 states have call predecessors, (90), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:59,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 437 transitions. [2023-11-21 20:58:59,861 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 437 transitions. Word has length 12 [2023-11-21 20:58:59,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:58:59,862 INFO L495 AbstractCegarLoop]: Abstraction has 288 states and 437 transitions. [2023-11-21 20:58:59,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:59,862 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 437 transitions. [2023-11-21 20:58:59,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-21 20:58:59,863 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:58:59,863 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:58:59,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-21 20:58:59,864 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:58:59,864 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:58:59,864 INFO L85 PathProgramCache]: Analyzing trace with hash -786993282, now seen corresponding path program 1 times [2023-11-21 20:58:59,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:58:59,865 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525781824] [2023-11-21 20:58:59,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:58:59,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:58:59,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:03,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:03,818 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:03,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525781824] [2023-11-21 20:59:03,818 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525781824] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:59:03,819 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:59:03,819 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:59:03,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053450070] [2023-11-21 20:59:03,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:59:03,820 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:59:03,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:03,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:59:03,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:03,822 INFO L87 Difference]: Start difference. First operand 288 states and 437 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:04,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:59:04,909 INFO L93 Difference]: Finished difference Result 358 states and 516 transitions. [2023-11-21 20:59:04,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:59:04,912 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-21 20:59:04,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:59:04,915 INFO L225 Difference]: With dead ends: 358 [2023-11-21 20:59:04,915 INFO L226 Difference]: Without dead ends: 355 [2023-11-21 20:59:04,916 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:04,917 INFO L413 NwaCegarLoop]: 111 mSDtfsCounter, 244 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 607 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 607 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-21 20:59:04,918 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 191 Invalid, 636 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 607 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-21 20:59:04,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2023-11-21 20:59:04,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 288. [2023-11-21 20:59:04,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 196 states have (on average 1.7653061224489797) internal successors, (346), 285 states have internal predecessors, (346), 90 states have call successors, (90), 2 states have call predecessors, (90), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:04,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 436 transitions. [2023-11-21 20:59:04,984 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 436 transitions. Word has length 15 [2023-11-21 20:59:04,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:59:04,984 INFO L495 AbstractCegarLoop]: Abstraction has 288 states and 436 transitions. [2023-11-21 20:59:04,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:04,985 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 436 transitions. [2023-11-21 20:59:04,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-21 20:59:04,986 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:59:04,986 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:59:04,986 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-21 20:59:04,987 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:59:04,987 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:04,988 INFO L85 PathProgramCache]: Analyzing trace with hash 1372356181, now seen corresponding path program 1 times [2023-11-21 20:59:04,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:04,988 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423641882] [2023-11-21 20:59:04,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:04,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:05,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:05,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:05,735 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:05,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423641882] [2023-11-21 20:59:05,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [423641882] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:59:05,735 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:59:05,736 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:59:05,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53090387] [2023-11-21 20:59:05,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:59:05,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:59:05,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:05,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:59:05,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:05,738 INFO L87 Difference]: Start difference. First operand 288 states and 436 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:06,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:59:06,279 INFO L93 Difference]: Finished difference Result 294 states and 439 transitions. [2023-11-21 20:59:06,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:59:06,279 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-21 20:59:06,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:59:06,282 INFO L225 Difference]: With dead ends: 294 [2023-11-21 20:59:06,282 INFO L226 Difference]: Without dead ends: 290 [2023-11-21 20:59:06,282 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:06,285 INFO L413 NwaCegarLoop]: 275 mSDtfsCounter, 272 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 20:59:06,285 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 278 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 20:59:06,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2023-11-21 20:59:06,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 286. [2023-11-21 20:59:06,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 196 states have (on average 1.7448979591836735) internal successors, (342), 283 states have internal predecessors, (342), 88 states have call successors, (88), 2 states have call predecessors, (88), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:06,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 430 transitions. [2023-11-21 20:59:06,335 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 430 transitions. Word has length 16 [2023-11-21 20:59:06,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:59:06,336 INFO L495 AbstractCegarLoop]: Abstraction has 286 states and 430 transitions. [2023-11-21 20:59:06,336 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:06,336 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 430 transitions. [2023-11-21 20:59:06,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-21 20:59:06,337 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:59:06,337 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:59:06,338 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-21 20:59:06,338 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:59:06,339 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:06,339 INFO L85 PathProgramCache]: Analyzing trace with hash -407280413, now seen corresponding path program 1 times [2023-11-21 20:59:06,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:06,339 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771269719] [2023-11-21 20:59:06,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:06,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:06,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:06,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:06,758 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:06,758 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771269719] [2023-11-21 20:59:06,758 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [771269719] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:59:06,758 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:59:06,759 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 20:59:06,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940217184] [2023-11-21 20:59:06,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:59:06,760 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 20:59:06,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:06,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 20:59:06,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 20:59:06,761 INFO L87 Difference]: Start difference. First operand 286 states and 430 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:06,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:59:06,888 INFO L93 Difference]: Finished difference Result 288 states and 431 transitions. [2023-11-21 20:59:06,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 20:59:06,889 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-21 20:59:06,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:59:06,893 INFO L225 Difference]: With dead ends: 288 [2023-11-21 20:59:06,894 INFO L226 Difference]: Without dead ends: 284 [2023-11-21 20:59:06,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 20:59:06,897 INFO L413 NwaCegarLoop]: 267 mSDtfsCounter, 264 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 20:59:06,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 267 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 20:59:06,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2023-11-21 20:59:06,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 284. [2023-11-21 20:59:06,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 196 states have (on average 1.7244897959183674) internal successors, (338), 281 states have internal predecessors, (338), 86 states have call successors, (86), 2 states have call predecessors, (86), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:06,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 424 transitions. [2023-11-21 20:59:06,986 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 424 transitions. Word has length 17 [2023-11-21 20:59:06,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:59:06,987 INFO L495 AbstractCegarLoop]: Abstraction has 284 states and 424 transitions. [2023-11-21 20:59:06,987 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:06,987 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 424 transitions. [2023-11-21 20:59:06,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-21 20:59:06,989 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:59:06,989 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:59:06,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-21 20:59:06,990 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:59:06,996 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:06,997 INFO L85 PathProgramCache]: Analyzing trace with hash 258566810, now seen corresponding path program 1 times [2023-11-21 20:59:06,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:06,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629826088] [2023-11-21 20:59:06,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:06,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:07,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:07,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:07,954 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:07,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629826088] [2023-11-21 20:59:07,955 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629826088] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:59:07,955 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:59:07,955 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:59:07,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053523572] [2023-11-21 20:59:07,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:59:07,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:59:07,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:07,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:59:07,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:07,961 INFO L87 Difference]: Start difference. First operand 284 states and 424 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:08,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:59:08,471 INFO L93 Difference]: Finished difference Result 286 states and 425 transitions. [2023-11-21 20:59:08,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:59:08,472 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-21 20:59:08,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:59:08,474 INFO L225 Difference]: With dead ends: 286 [2023-11-21 20:59:08,475 INFO L226 Difference]: Without dead ends: 283 [2023-11-21 20:59:08,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:08,476 INFO L413 NwaCegarLoop]: 264 mSDtfsCounter, 262 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 20:59:08,476 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 267 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 284 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 20:59:08,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2023-11-21 20:59:08,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 283. [2023-11-21 20:59:08,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 196 states have (on average 1.7142857142857142) internal successors, (336), 280 states have internal predecessors, (336), 85 states have call successors, (85), 2 states have call predecessors, (85), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:08,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 421 transitions. [2023-11-21 20:59:08,517 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 421 transitions. Word has length 18 [2023-11-21 20:59:08,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:59:08,517 INFO L495 AbstractCegarLoop]: Abstraction has 283 states and 421 transitions. [2023-11-21 20:59:08,518 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:08,518 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 421 transitions. [2023-11-21 20:59:08,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 20:59:08,519 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:59:08,519 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:59:08,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-21 20:59:08,519 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:59:08,520 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:08,520 INFO L85 PathProgramCache]: Analyzing trace with hash -574998968, now seen corresponding path program 1 times [2023-11-21 20:59:08,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:08,520 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219522402] [2023-11-21 20:59:08,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:08,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:08,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:09,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:09,436 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:09,436 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219522402] [2023-11-21 20:59:09,436 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [219522402] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:59:09,436 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:59:09,436 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:59:09,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611011513] [2023-11-21 20:59:09,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:59:09,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:59:09,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:09,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:59:09,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:09,439 INFO L87 Difference]: Start difference. First operand 283 states and 421 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:09,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:59:09,954 INFO L93 Difference]: Finished difference Result 285 states and 422 transitions. [2023-11-21 20:59:09,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:59:09,955 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-21 20:59:09,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:59:09,957 INFO L225 Difference]: With dead ends: 285 [2023-11-21 20:59:09,957 INFO L226 Difference]: Without dead ends: 282 [2023-11-21 20:59:09,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:09,958 INFO L413 NwaCegarLoop]: 263 mSDtfsCounter, 259 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 20:59:09,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 266 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 20:59:09,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2023-11-21 20:59:09,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 282. [2023-11-21 20:59:09,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 196 states have (on average 1.7040816326530612) internal successors, (334), 279 states have internal predecessors, (334), 84 states have call successors, (84), 2 states have call predecessors, (84), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:09,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 418 transitions. [2023-11-21 20:59:09,997 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 418 transitions. Word has length 19 [2023-11-21 20:59:09,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:59:09,999 INFO L495 AbstractCegarLoop]: Abstraction has 282 states and 418 transitions. [2023-11-21 20:59:09,999 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:09,999 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 418 transitions. [2023-11-21 20:59:10,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-21 20:59:10,000 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:59:10,000 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] [2023-11-21 20:59:10,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-21 20:59:10,001 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:59:10,001 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:10,001 INFO L85 PathProgramCache]: Analyzing trace with hash -645727521, now seen corresponding path program 1 times [2023-11-21 20:59:10,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:10,002 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783740851] [2023-11-21 20:59:10,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:10,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:10,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:11,241 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:11,242 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:11,242 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783740851] [2023-11-21 20:59:11,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783740851] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:59:11,242 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:59:11,242 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:59:11,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650353871] [2023-11-21 20:59:11,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:59:11,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:59:11,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:11,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:59:11,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:11,244 INFO L87 Difference]: Start difference. First operand 282 states and 418 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:11,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:59:11,815 INFO L93 Difference]: Finished difference Result 284 states and 419 transitions. [2023-11-21 20:59:11,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:59:11,816 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-21 20:59:11,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:59:11,818 INFO L225 Difference]: With dead ends: 284 [2023-11-21 20:59:11,818 INFO L226 Difference]: Without dead ends: 281 [2023-11-21 20:59:11,819 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:11,819 INFO L413 NwaCegarLoop]: 265 mSDtfsCounter, 256 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 20:59:11,820 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 268 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 20:59:11,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2023-11-21 20:59:11,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 281. [2023-11-21 20:59:11,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 196 states have (on average 1.6938775510204083) internal successors, (332), 278 states have internal predecessors, (332), 83 states have call successors, (83), 2 states have call predecessors, (83), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:11,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 415 transitions. [2023-11-21 20:59:11,862 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 415 transitions. Word has length 20 [2023-11-21 20:59:11,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:59:11,863 INFO L495 AbstractCegarLoop]: Abstraction has 281 states and 415 transitions. [2023-11-21 20:59:11,863 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:11,863 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 415 transitions. [2023-11-21 20:59:11,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-21 20:59:11,864 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:59:11,864 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] [2023-11-21 20:59:11,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-21 20:59:11,865 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:59:11,865 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:11,865 INFO L85 PathProgramCache]: Analyzing trace with hash 1456661421, now seen corresponding path program 1 times [2023-11-21 20:59:11,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:11,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125946395] [2023-11-21 20:59:11,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:11,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:11,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:14,987 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:14,988 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:14,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125946395] [2023-11-21 20:59:14,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [125946395] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:59:14,988 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:59:14,988 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:59:14,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882280949] [2023-11-21 20:59:14,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:59:14,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:59:14,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:14,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:59:14,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:14,990 INFO L87 Difference]: Start difference. First operand 281 states and 415 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:15,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 20:59:15,517 INFO L93 Difference]: Finished difference Result 364 states and 506 transitions. [2023-11-21 20:59:15,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:59:15,518 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2023-11-21 20:59:15,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 20:59:15,520 INFO L225 Difference]: With dead ends: 364 [2023-11-21 20:59:15,520 INFO L226 Difference]: Without dead ends: 353 [2023-11-21 20:59:15,521 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:59:15,521 INFO L413 NwaCegarLoop]: 244 mSDtfsCounter, 205 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 499 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 20:59:15,522 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [205 Valid, 499 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 20:59:15,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2023-11-21 20:59:15,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 281. [2023-11-21 20:59:15,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 196 states have (on average 1.6581632653061225) internal successors, (325), 278 states have internal predecessors, (325), 83 states have call successors, (83), 2 states have call predecessors, (83), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:15,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 408 transitions. [2023-11-21 20:59:15,568 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 408 transitions. Word has length 21 [2023-11-21 20:59:15,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 20:59:15,569 INFO L495 AbstractCegarLoop]: Abstraction has 281 states and 408 transitions. [2023-11-21 20:59:15,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:15,569 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 408 transitions. [2023-11-21 20:59:15,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-21 20:59:15,572 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 20:59:15,572 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] [2023-11-21 20:59:15,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-21 20:59:15,573 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 20:59:15,573 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:15,573 INFO L85 PathProgramCache]: Analyzing trace with hash -2088751324, now seen corresponding path program 1 times [2023-11-21 20:59:15,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:15,574 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859792550] [2023-11-21 20:59:15,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:15,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:15,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:17,920 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:17,920 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:17,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859792550] [2023-11-21 20:59:17,921 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1859792550] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:59:17,921 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:59:17,921 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 20:59:17,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426300359] [2023-11-21 20:59:17,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:59:17,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 20:59:17,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:17,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 20:59:17,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-21 20:59:17,923 INFO L87 Difference]: Start difference. First operand 281 states and 408 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)