./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 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_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 368647bf8c8fe53592ceb4314bbebffd0b8c087a8115d4714b27d4e56ab0a9cf --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:10:47,805 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:10:47,954 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:10:47,960 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:10:47,961 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:10:47,987 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:10:47,987 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:10:47,988 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:10:47,989 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:10:47,990 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:10:47,990 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:10:47,991 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:10:47,992 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:10:47,992 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:10:47,993 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:10:47,994 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:10:47,994 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:10:47,995 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:10:47,995 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:10:47,996 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:10:47,996 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:10:47,997 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:10:47,998 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:10:47,998 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:10:47,999 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:10:47,999 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:10:48,000 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:10:48,000 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:10:48,001 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:10:48,001 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:10:48,002 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:10:48,002 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:10:48,003 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:10:48,003 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:10:48,004 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:10:48,004 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:10:48,004 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:10:48,005 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:10:48,005 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:10:48,006 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:10:48,006 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:10:48,007 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:10:48,007 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:10:48,008 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:10:48,008 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:10:48,009 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 368647bf8c8fe53592ceb4314bbebffd0b8c087a8115d4714b27d4e56ab0a9cf [2023-11-12 00:10:48,388 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:10:48,414 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:10:48,419 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:10:48,421 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:10:48,423 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:10:48,425 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c [2023-11-12 00:10:51,673 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:10:52,035 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:10:52,036 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c [2023-11-12 00:10:52,057 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/data/f778ab2c4/0146cbe0957f40ccac9381d80ed80389/FLAGda6dfeb60 [2023-11-12 00:10:52,078 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/data/f778ab2c4/0146cbe0957f40ccac9381d80ed80389 [2023-11-12 00:10:52,090 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:10:52,093 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:10:52,095 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:10:52,096 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:10:52,101 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:10:52,102 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,104 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b61c596 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52, skipping insertion in model container [2023-11-12 00:10:52,104 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,170 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:10:52,425 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_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c[14371,14384] [2023-11-12 00:10:52,430 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:10:52,446 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:10:52,529 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_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c[14371,14384] [2023-11-12 00:10:52,530 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:10:52,551 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:10:52,552 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52 WrapperNode [2023-11-12 00:10:52,552 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:10:52,554 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:10:52,554 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:10:52,555 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:10:52,564 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,579 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,640 INFO L138 Inliner]: procedures = 22, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 484 [2023-11-12 00:10:52,641 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:10:52,642 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:10:52,642 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:10:52,642 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:10:52,654 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,654 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,674 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,674 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,688 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,698 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,702 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,705 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,713 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:10:52,714 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:10:52,715 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:10:52,715 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:10:52,716 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (1/1) ... [2023-11-12 00:10:52,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:10:52,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:10:52,779 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:10:52,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:10:52,919 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:10:52,919 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:10:52,919 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:10:52,920 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:10:53,131 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:10:53,134 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:10:54,021 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:10:55,122 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:10:55,122 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-12 00:10:55,126 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:10:55 BoogieIcfgContainer [2023-11-12 00:10:55,126 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:10:55,130 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:10:55,130 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:10:55,134 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:10:55,135 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:10:52" (1/3) ... [2023-11-12 00:10:55,136 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d15321a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:10:55, skipping insertion in model container [2023-11-12 00:10:55,137 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:10:52" (2/3) ... [2023-11-12 00:10:55,139 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d15321a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:10:55, skipping insertion in model container [2023-11-12 00:10:55,140 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:10:55" (3/3) ... [2023-11-12 00:10:55,143 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c [2023-11-12 00:10:55,169 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:10:55,170 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:10:55,252 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:10:55,263 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@7d96ef49, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:10:55,265 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:10:55,271 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:10:55,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 00:10:55,279 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:10:55,281 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 00:10:55,282 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:10:55,291 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:10:55,292 INFO L85 PathProgramCache]: Analyzing trace with hash -367105962, now seen corresponding path program 1 times [2023-11-12 00:10:55,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:10:55,305 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708391011] [2023-11-12 00:10:55,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:10:55,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:10:55,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:10:58,194 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:10:58,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:10:58,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708391011] [2023-11-12 00:10:58,197 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [708391011] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:10:58,197 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:10:58,198 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:10:58,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888285906] [2023-11-12 00:10:58,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:10:58,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:10:58,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:10:58,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:10:58,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:10:58,271 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:10:58,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:10:58,463 INFO L93 Difference]: Finished difference Result 57 states and 90 transitions. [2023-11-12 00:10:58,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:10:58,466 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 00:10:58,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:10:58,475 INFO L225 Difference]: With dead ends: 57 [2023-11-12 00:10:58,476 INFO L226 Difference]: Without dead ends: 36 [2023-11-12 00:10:58,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:10:58,484 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 26 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:10:58,485 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 38 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:10:58,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-12 00:10:58,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2023-11-12 00:10:58,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 26 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:10:58,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 43 transitions. [2023-11-12 00:10:58,539 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 43 transitions. Word has length 6 [2023-11-12 00:10:58,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:10:58,540 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 43 transitions. [2023-11-12 00:10:58,540 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:10:58,541 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 43 transitions. [2023-11-12 00:10:58,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:10:58,542 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:10:58,542 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:10:58,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:10:58,543 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:10:58,544 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:10:58,544 INFO L85 PathProgramCache]: Analyzing trace with hash 1442011356, now seen corresponding path program 1 times [2023-11-12 00:10:58,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:10:58,545 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299002783] [2023-11-12 00:10:58,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:10:58,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:10:58,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:10:59,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:10:59,914 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:10:59,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299002783] [2023-11-12 00:10:59,915 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299002783] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:10:59,916 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:10:59,916 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:10:59,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534139848] [2023-11-12 00:10:59,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:10:59,918 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:10:59,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:10:59,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:10:59,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:10:59,920 INFO L87 Difference]: Start difference. First operand 27 states and 43 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:00,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:00,056 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2023-11-12 00:11:00,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:11:00,057 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 00:11:00,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:00,059 INFO L225 Difference]: With dead ends: 53 [2023-11-12 00:11:00,059 INFO L226 Difference]: Without dead ends: 36 [2023-11-12 00:11:00,065 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 [2023-11-12 00:11:00,068 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:00,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 45 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:00,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-12 00:11:00,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2023-11-12 00:11:00,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 26 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:00,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 42 transitions. [2023-11-12 00:11:00,088 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 42 transitions. Word has length 7 [2023-11-12 00:11:00,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:00,089 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 42 transitions. [2023-11-12 00:11:00,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:00,090 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 42 transitions. [2023-11-12 00:11:00,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:11:00,091 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:00,092 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:00,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:11:00,093 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:00,100 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:00,100 INFO L85 PathProgramCache]: Analyzing trace with hash 1695525119, now seen corresponding path program 1 times [2023-11-12 00:11:00,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:00,101 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672141541] [2023-11-12 00:11:00,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:00,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:00,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:01,233 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:01,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:01,234 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672141541] [2023-11-12 00:11:01,235 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672141541] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:01,236 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:11:01,236 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:11:01,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852717766] [2023-11-12 00:11:01,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:01,238 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:11:01,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:01,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:11:01,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:11:01,243 INFO L87 Difference]: Start difference. First operand 27 states and 42 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:01,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:01,379 INFO L93 Difference]: Finished difference Result 53 states and 80 transitions. [2023-11-12 00:11:01,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:11:01,380 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-12 00:11:01,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:01,383 INFO L225 Difference]: With dead ends: 53 [2023-11-12 00:11:01,383 INFO L226 Difference]: Without dead ends: 36 [2023-11-12 00:11:01,387 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 [2023-11-12 00:11:01,396 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 20 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:01,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 45 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:01,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-12 00:11:01,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2023-11-12 00:11:01,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:01,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 41 transitions. [2023-11-12 00:11:01,411 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 41 transitions. Word has length 8 [2023-11-12 00:11:01,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:01,413 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 41 transitions. [2023-11-12 00:11:01,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:01,419 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 41 transitions. [2023-11-12 00:11:01,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:11:01,420 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:01,421 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:01,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:11:01,421 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:01,423 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:01,423 INFO L85 PathProgramCache]: Analyzing trace with hash 969968933, now seen corresponding path program 1 times [2023-11-12 00:11:01,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:01,424 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047304306] [2023-11-12 00:11:01,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:01,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:01,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:02,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:02,542 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:02,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047304306] [2023-11-12 00:11:02,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2047304306] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:02,543 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:11:02,543 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:11:02,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218291761] [2023-11-12 00:11:02,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:02,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:11:02,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:02,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:11:02,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:11:02,546 INFO L87 Difference]: Start difference. First operand 27 states and 41 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:02,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:02,651 INFO L93 Difference]: Finished difference Result 53 states and 79 transitions. [2023-11-12 00:11:02,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:11:02,652 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-12 00:11:02,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:02,653 INFO L225 Difference]: With dead ends: 53 [2023-11-12 00:11:02,653 INFO L226 Difference]: Without dead ends: 36 [2023-11-12 00:11:02,654 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 [2023-11-12 00:11:02,655 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:02,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 45 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:02,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-12 00:11:02,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2023-11-12 00:11:02,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:02,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 40 transitions. [2023-11-12 00:11:02,663 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 40 transitions. Word has length 9 [2023-11-12 00:11:02,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:02,664 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 40 transitions. [2023-11-12 00:11:02,664 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:02,665 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 40 transitions. [2023-11-12 00:11:02,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:11:02,665 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:02,666 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:02,666 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:11:02,666 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:02,667 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:02,667 INFO L85 PathProgramCache]: Analyzing trace with hash -1340384883, now seen corresponding path program 1 times [2023-11-12 00:11:02,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:02,667 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749228657] [2023-11-12 00:11:02,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:02,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:02,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:03,889 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:03,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:03,890 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749228657] [2023-11-12 00:11:03,890 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749228657] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:03,890 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:11:03,890 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:11:03,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606494550] [2023-11-12 00:11:03,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:03,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:11:03,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:03,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:11:03,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:11:03,894 INFO L87 Difference]: Start difference. First operand 27 states and 40 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:04,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:04,020 INFO L93 Difference]: Finished difference Result 55 states and 82 transitions. [2023-11-12 00:11:04,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:11:04,022 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-12 00:11:04,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:04,022 INFO L225 Difference]: With dead ends: 55 [2023-11-12 00:11:04,023 INFO L226 Difference]: Without dead ends: 38 [2023-11-12 00:11:04,023 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 [2023-11-12 00:11:04,024 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:04,025 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 42 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:04,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-12 00:11:04,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 27. [2023-11-12 00:11:04,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:04,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 39 transitions. [2023-11-12 00:11:04,035 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 39 transitions. Word has length 11 [2023-11-12 00:11:04,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:04,036 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 39 transitions. [2023-11-12 00:11:04,036 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:04,036 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2023-11-12 00:11:04,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-12 00:11:04,037 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:04,037 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:04,038 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-12 00:11:04,038 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:04,038 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:04,039 INFO L85 PathProgramCache]: Analyzing trace with hash 1309843318, now seen corresponding path program 1 times [2023-11-12 00:11:04,039 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:04,039 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476930455] [2023-11-12 00:11:04,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:04,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:04,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:05,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:05,006 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:05,006 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476930455] [2023-11-12 00:11:05,006 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476930455] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:05,007 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:11:05,007 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:11:05,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493303188] [2023-11-12 00:11:05,007 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:05,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:11:05,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:05,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:11:05,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:11:05,009 INFO L87 Difference]: Start difference. First operand 27 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:05,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:05,085 INFO L93 Difference]: Finished difference Result 56 states and 82 transitions. [2023-11-12 00:11:05,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:11:05,087 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-12 00:11:05,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:05,091 INFO L225 Difference]: With dead ends: 56 [2023-11-12 00:11:05,092 INFO L226 Difference]: Without dead ends: 37 [2023-11-12 00:11:05,092 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 [2023-11-12 00:11:05,094 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:05,095 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 57 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:05,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-12 00:11:05,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 29. [2023-11-12 00:11:05,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:05,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2023-11-12 00:11:05,109 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 12 [2023-11-12 00:11:05,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:05,109 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2023-11-12 00:11:05,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:05,110 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2023-11-12 00:11:05,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-12 00:11:05,111 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:05,111 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:05,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 00:11:05,111 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:05,112 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:05,112 INFO L85 PathProgramCache]: Analyzing trace with hash 1848719836, now seen corresponding path program 1 times [2023-11-12 00:11:05,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:05,112 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796913361] [2023-11-12 00:11:05,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:05,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:05,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:06,253 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:06,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:06,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796913361] [2023-11-12 00:11:06,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [796913361] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:06,254 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:11:06,255 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:11:06,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683954531] [2023-11-12 00:11:06,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:06,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:11:06,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:06,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:11:06,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:11:06,257 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:06,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:06,345 INFO L93 Difference]: Finished difference Result 56 states and 79 transitions. [2023-11-12 00:11:06,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:11:06,345 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-12 00:11:06,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:06,346 INFO L225 Difference]: With dead ends: 56 [2023-11-12 00:11:06,346 INFO L226 Difference]: Without dead ends: 37 [2023-11-12 00:11:06,346 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 [2023-11-12 00:11:06,347 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:06,348 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 52 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:06,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-12 00:11:06,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2023-11-12 00:11:06,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:06,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2023-11-12 00:11:06,352 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 14 [2023-11-12 00:11:06,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:06,353 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2023-11-12 00:11:06,353 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:06,354 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2023-11-12 00:11:06,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 00:11:06,354 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:06,354 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:06,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-12 00:11:06,355 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:06,355 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:06,356 INFO L85 PathProgramCache]: Analyzing trace with hash 1463570521, now seen corresponding path program 1 times [2023-11-12 00:11:06,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:06,356 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628211837] [2023-11-12 00:11:06,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:06,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:06,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:06,662 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:06,662 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:06,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628211837] [2023-11-12 00:11:06,662 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [628211837] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:06,663 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:11:06,663 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-12 00:11:06,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763966519] [2023-11-12 00:11:06,663 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:06,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:11:06,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:06,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:11:06,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:11:06,666 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:06,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:06,785 INFO L93 Difference]: Finished difference Result 59 states and 83 transitions. [2023-11-12 00:11:06,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:11:06,786 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-12 00:11:06,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:06,788 INFO L225 Difference]: With dead ends: 59 [2023-11-12 00:11:06,789 INFO L226 Difference]: Without dead ends: 40 [2023-11-12 00:11:06,790 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:11:06,791 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 12 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:06,792 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 73 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:06,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-11-12 00:11:06,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 33. [2023-11-12 00:11:06,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.34375) internal successors, (43), 32 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:06,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2023-11-12 00:11:06,805 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 15 [2023-11-12 00:11:06,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:06,806 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2023-11-12 00:11:06,806 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:06,806 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2023-11-12 00:11:06,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-12 00:11:06,807 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:06,807 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:06,807 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-12 00:11:06,808 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:06,808 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:06,808 INFO L85 PathProgramCache]: Analyzing trace with hash 638149531, now seen corresponding path program 1 times [2023-11-12 00:11:06,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:06,809 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049285771] [2023-11-12 00:11:06,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:06,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:07,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:09,745 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:09,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:09,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049285771] [2023-11-12 00:11:09,747 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049285771] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:09,747 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033418917] [2023-11-12 00:11:09,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:09,747 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:09,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:09,751 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:09,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_36a8ee9f-1ba9-432f-b68c-dc8d0bf3fd54/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:11:09,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:09,977 INFO L262 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-12 00:11:10,007 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:24,253 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:24,254 INFO L327 TraceCheckSpWp]: Computing backward predicates...