./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ --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 4fa4154afcc1fa94c570756c4d3485a9415aeef22801b46450f13cd61ecf8230 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:04:38,178 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:04:38,309 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:04:38,322 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:04:38,323 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:04:38,364 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:04:38,364 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:04:38,365 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:04:38,366 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:04:38,371 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:04:38,372 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:04:38,373 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:04:38,374 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:04:38,376 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:04:38,376 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:04:38,377 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:04:38,377 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:04:38,378 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:04:38,378 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:04:38,379 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:04:38,379 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:04:38,380 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:04:38,381 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:04:38,381 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:04:38,382 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:04:38,382 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:04:38,383 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:04:38,383 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:04:38,384 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:04:38,384 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:04:38,385 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:04:38,386 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:04:38,386 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:04:38,386 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:04:38,387 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:04:38,387 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:04:38,387 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:04:38,387 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:04:38,388 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:04:38,388 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:04:38,388 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:04:38,389 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:04:38,389 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:04:38,389 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:04:38,390 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:04:38,390 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_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4fa4154afcc1fa94c570756c4d3485a9415aeef22801b46450f13cd61ecf8230 [2023-11-19 05:04:38,743 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:04:38,775 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:04:38,777 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:04:38,779 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:04:38,780 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:04:38,783 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c [2023-11-19 05:04:42,036 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:04:42,491 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:04:42,495 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c [2023-11-19 05:04:42,516 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/data/635aaf54e/b19031e80a6449fcaf7a8419ff1ca342/FLAG30b8c4a35 [2023-11-19 05:04:42,529 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/data/635aaf54e/b19031e80a6449fcaf7a8419ff1ca342 [2023-11-19 05:04:42,531 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:04:42,533 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:04:42,534 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:04:42,534 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:04:42,540 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:04:42,540 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:04:42" (1/1) ... [2023-11-19 05:04:42,542 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f8bb3bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:42, skipping insertion in model container [2023-11-19 05:04:42,542 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:04:42" (1/1) ... [2023-11-19 05:04:42,645 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:04:42,982 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_6d358053-1c48-4da0-b957-fd4a81b6eee1/sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c[14523,14536] [2023-11-19 05:04:43,352 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:04:43,370 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:04:43,383 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [48] [2023-11-19 05:04:43,385 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [169] [2023-11-19 05:04:43,386 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [528] [2023-11-19 05:04:43,386 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification3_spec.i","") [623] [2023-11-19 05:04:43,387 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [813] [2023-11-19 05:04:43,388 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [828] [2023-11-19 05:04:43,389 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [837] [2023-11-19 05:04:43,389 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [2419] [2023-11-19 05:04:43,389 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [2785] [2023-11-19 05:04:43,390 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [2820] [2023-11-19 05:04:43,429 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_6d358053-1c48-4da0-b957-fd4a81b6eee1/sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c[14523,14536] [2023-11-19 05:04:43,536 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:04:43,574 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:04:43,575 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43 WrapperNode [2023-11-19 05:04:43,575 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:04:43,576 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:04:43,576 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:04:43,577 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:04:43,585 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,618 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,697 INFO L138 Inliner]: procedures = 93, calls = 353, calls flagged for inlining = 28, calls inlined = 24, statements flattened = 948 [2023-11-19 05:04:43,697 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:04:43,698 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:04:43,698 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:04:43,699 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:04:43,711 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,711 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,722 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,737 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,835 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,901 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,907 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,928 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,939 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:04:43,943 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:04:43,943 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:04:43,944 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:04:43,945 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (1/1) ... [2023-11-19 05:04:43,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:04:43,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:04:43,980 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:04:43,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:04:44,030 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:04:44,031 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2023-11-19 05:04:44,031 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2023-11-19 05:04:44,031 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2023-11-19 05:04:44,031 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2023-11-19 05:04:44,032 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-11-19 05:04:44,032 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-11-19 05:04:44,032 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-11-19 05:04:44,033 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-11-19 05:04:44,033 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-11-19 05:04:44,034 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-11-19 05:04:44,034 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-11-19 05:04:44,034 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-11-19 05:04:44,034 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2023-11-19 05:04:44,036 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2023-11-19 05:04:44,036 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-11-19 05:04:44,036 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-11-19 05:04:44,036 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-11-19 05:04:44,040 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-11-19 05:04:44,040 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-11-19 05:04:44,040 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-11-19 05:04:44,041 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-11-19 05:04:44,041 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-11-19 05:04:44,041 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-11-19 05:04:44,041 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-11-19 05:04:44,042 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-11-19 05:04:44,042 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-11-19 05:04:44,042 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2023-11-19 05:04:44,042 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2023-11-19 05:04:44,042 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2023-11-19 05:04:44,043 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2023-11-19 05:04:44,043 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-11-19 05:04:44,043 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-11-19 05:04:44,043 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2023-11-19 05:04:44,044 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2023-11-19 05:04:44,044 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-11-19 05:04:44,044 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-11-19 05:04:44,044 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-11-19 05:04:44,044 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-11-19 05:04:44,045 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-11-19 05:04:44,045 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-11-19 05:04:44,045 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-11-19 05:04:44,045 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-11-19 05:04:44,045 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:04:44,046 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2023-11-19 05:04:44,046 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2023-11-19 05:04:44,046 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-11-19 05:04:44,046 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-11-19 05:04:44,046 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-11-19 05:04:44,047 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-11-19 05:04:44,047 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-11-19 05:04:44,048 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-11-19 05:04:44,050 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__twothirdsfull [2023-11-19 05:04:44,050 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__twothirdsfull [2023-11-19 05:04:44,050 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:04:44,051 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:04:44,051 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-11-19 05:04:44,051 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-11-19 05:04:44,297 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:04:44,303 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:04:45,670 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:04:46,778 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:04:46,778 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-19 05:04:46,788 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:04:46 BoogieIcfgContainer [2023-11-19 05:04:46,788 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:04:46,791 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:04:46,791 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:04:46,794 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:04:46,795 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:04:42" (1/3) ... [2023-11-19 05:04:46,796 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77173fce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:04:46, skipping insertion in model container [2023-11-19 05:04:46,796 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:04:43" (2/3) ... [2023-11-19 05:04:46,797 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77173fce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:04:46, skipping insertion in model container [2023-11-19 05:04:46,797 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:04:46" (3/3) ... [2023-11-19 05:04:46,798 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product30.cil.c [2023-11-19 05:04:46,821 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:04:46,821 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:04:46,891 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:04:46,899 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;@254de8ec, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:04:46,900 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:04:46,908 INFO L276 IsEmpty]: Start isEmpty. Operand has 411 states, 274 states have (on average 1.572992700729927) internal successors, (431), 294 states have internal predecessors, (431), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2023-11-19 05:04:46,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-11-19 05:04:46,923 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:04:46,924 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:04:46,925 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:04:46,930 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:04:46,931 INFO L85 PathProgramCache]: Analyzing trace with hash 119172305, now seen corresponding path program 1 times [2023-11-19 05:04:46,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:04:46,940 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849137816] [2023-11-19 05:04:46,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:04:46,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:04:47,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:04:48,174 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:04:48,174 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:04:48,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849137816] [2023-11-19 05:04:48,176 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849137816] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:04:48,176 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:04:48,176 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 05:04:48,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215859389] [2023-11-19 05:04:48,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:04:48,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:04:48,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:04:48,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:04:48,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:04:48,287 INFO L87 Difference]: Start difference. First operand has 411 states, 274 states have (on average 1.572992700729927) internal successors, (431), 294 states have internal predecessors, (431), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) Second operand has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-19 05:04:49,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:04:49,557 INFO L93 Difference]: Finished difference Result 1158 states and 1853 transitions. [2023-11-19 05:04:49,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:04:49,561 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 49 [2023-11-19 05:04:49,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:04:49,591 INFO L225 Difference]: With dead ends: 1158 [2023-11-19 05:04:49,591 INFO L226 Difference]: Without dead ends: 749 [2023-11-19 05:04:49,611 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-11-19 05:04:49,615 INFO L413 NwaCegarLoop]: 621 mSDtfsCounter, 530 mSDsluCounter, 2186 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 532 SdHoareTripleChecker+Valid, 2807 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:04:49,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [532 Valid, 2807 Invalid, 742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-19 05:04:49,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 749 states. [2023-11-19 05:04:49,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 749 to 743. [2023-11-19 05:04:49,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 743 states, 497 states have (on average 1.5010060362173039) internal successors, (746), 531 states have internal predecessors, (746), 198 states have call successors, (198), 51 states have call predecessors, (198), 47 states have return successors, (201), 187 states have call predecessors, (201), 194 states have call successors, (201) [2023-11-19 05:04:49,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 743 states to 743 states and 1145 transitions. [2023-11-19 05:04:49,791 INFO L78 Accepts]: Start accepts. Automaton has 743 states and 1145 transitions. Word has length 49 [2023-11-19 05:04:49,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:04:49,793 INFO L495 AbstractCegarLoop]: Abstraction has 743 states and 1145 transitions. [2023-11-19 05:04:49,793 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-19 05:04:49,793 INFO L276 IsEmpty]: Start isEmpty. Operand 743 states and 1145 transitions. [2023-11-19 05:04:49,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-19 05:04:49,804 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:04:49,804 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:04:49,804 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:04:49,805 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:04:49,805 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:04:49,805 INFO L85 PathProgramCache]: Analyzing trace with hash -378550204, now seen corresponding path program 1 times [2023-11-19 05:04:49,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:04:49,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241683043] [2023-11-19 05:04:49,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:04:49,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:04:49,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:04:50,236 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:04:50,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:04:50,241 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241683043] [2023-11-19 05:04:50,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241683043] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:04:50,243 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:04:50,243 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:04:50,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761941155] [2023-11-19 05:04:50,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:04:50,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:04:50,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:04:50,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:04:50,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:04:50,257 INFO L87 Difference]: Start difference. First operand 743 states and 1145 transitions. Second operand has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-19 05:04:50,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:04:50,655 INFO L93 Difference]: Finished difference Result 2199 states and 3423 transitions. [2023-11-19 05:04:50,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:04:50,657 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 50 [2023-11-19 05:04:50,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:04:50,677 INFO L225 Difference]: With dead ends: 2199 [2023-11-19 05:04:50,678 INFO L226 Difference]: Without dead ends: 1469 [2023-11-19 05:04:50,688 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:04:50,690 INFO L413 NwaCegarLoop]: 647 mSDtfsCounter, 602 mSDsluCounter, 569 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 602 SdHoareTripleChecker+Valid, 1216 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:04:50,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [602 Valid, 1216 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:04:50,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1469 states. [2023-11-19 05:04:50,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1469 to 1397. [2023-11-19 05:04:50,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1397 states, 963 states have (on average 1.5150571131879542) internal successors, (1459), 1015 states have internal predecessors, (1459), 349 states have call successors, (349), 91 states have call predecessors, (349), 84 states have return successors, (369), 318 states have call predecessors, (369), 343 states have call successors, (369) [2023-11-19 05:04:50,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 2177 transitions. [2023-11-19 05:04:50,912 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 2177 transitions. Word has length 50 [2023-11-19 05:04:50,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:04:50,913 INFO L495 AbstractCegarLoop]: Abstraction has 1397 states and 2177 transitions. [2023-11-19 05:04:50,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-19 05:04:50,914 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 2177 transitions. [2023-11-19 05:04:50,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-19 05:04:50,924 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:04:50,924 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:04:50,925 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:04:50,925 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:04:50,925 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:04:50,926 INFO L85 PathProgramCache]: Analyzing trace with hash -854458103, now seen corresponding path program 1 times [2023-11-19 05:04:50,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:04:50,926 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464166014] [2023-11-19 05:04:50,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:04:50,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:04:51,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:04:51,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:04:51,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:04:51,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464166014] [2023-11-19 05:04:51,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [464166014] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:04:51,451 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:04:51,451 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:04:51,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681763293] [2023-11-19 05:04:51,452 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:04:51,452 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:04:51,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:04:51,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:04:51,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:04:51,454 INFO L87 Difference]: Start difference. First operand 1397 states and 2177 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (17), 3 states have call predecessors, (17), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 05:04:51,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:04:51,777 INFO L93 Difference]: Finished difference Result 3094 states and 4830 transitions. [2023-11-19 05:04:51,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:04:51,778 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (17), 3 states have call predecessors, (17), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 86 [2023-11-19 05:04:51,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:04:51,796 INFO L225 Difference]: With dead ends: 3094 [2023-11-19 05:04:51,797 INFO L226 Difference]: Without dead ends: 1709 [2023-11-19 05:04:51,809 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:04:51,811 INFO L413 NwaCegarLoop]: 671 mSDtfsCounter, 446 mSDsluCounter, 1040 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 448 SdHoareTripleChecker+Valid, 1711 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:04:51,811 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [448 Valid, 1711 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:04:51,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1709 states. [2023-11-19 05:04:51,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1709 to 1691. [2023-11-19 05:04:51,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1691 states, 1161 states have (on average 1.4969853574504737) internal successors, (1738), 1212 states have internal predecessors, (1738), 419 states have call successors, (419), 115 states have call predecessors, (419), 110 states have return successors, (457), 390 states have call predecessors, (457), 411 states have call successors, (457) [2023-11-19 05:04:51,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1691 states to 1691 states and 2614 transitions. [2023-11-19 05:04:51,962 INFO L78 Accepts]: Start accepts. Automaton has 1691 states and 2614 transitions. Word has length 86 [2023-11-19 05:04:51,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:04:51,963 INFO L495 AbstractCegarLoop]: Abstraction has 1691 states and 2614 transitions. [2023-11-19 05:04:51,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (17), 3 states have call predecessors, (17), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 05:04:51,964 INFO L276 IsEmpty]: Start isEmpty. Operand 1691 states and 2614 transitions. [2023-11-19 05:04:51,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-11-19 05:04:51,967 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:04:51,967 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:04:51,967 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:04:51,968 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:04:51,968 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:04:51,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1108633048, now seen corresponding path program 1 times [2023-11-19 05:04:51,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:04:51,969 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232069861] [2023-11-19 05:04:51,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:04:51,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:04:52,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:04:52,496 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:04:52,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:04:52,496 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232069861] [2023-11-19 05:04:52,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232069861] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:04:52,497 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:04:52,497 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 05:04:52,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746404131] [2023-11-19 05:04:52,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:04:52,498 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:04:52,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:04:52,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:04:52,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:04:52,500 INFO L87 Difference]: Start difference. First operand 1691 states and 2614 transitions. Second operand has 6 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 05:04:53,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:04:53,483 INFO L93 Difference]: Finished difference Result 4291 states and 6779 transitions. [2023-11-19 05:04:53,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:04:53,484 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 87 [2023-11-19 05:04:53,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:04:53,519 INFO L225 Difference]: With dead ends: 4291 [2023-11-19 05:04:53,520 INFO L226 Difference]: Without dead ends: 2612 [2023-11-19 05:04:53,538 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-11-19 05:04:53,539 INFO L413 NwaCegarLoop]: 648 mSDtfsCounter, 640 mSDsluCounter, 2312 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 656 SdHoareTripleChecker+Valid, 2960 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-19 05:04:53,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [656 Valid, 2960 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 461 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-19 05:04:53,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2612 states. [2023-11-19 05:04:53,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2612 to 2474. [2023-11-19 05:04:53,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2474 states, 1702 states have (on average 1.4882491186839013) internal successors, (2533), 1785 states have internal predecessors, (2533), 607 states have call successors, (607), 171 states have call predecessors, (607), 164 states have return successors, (710), 559 states have call predecessors, (710), 596 states have call successors, (710) [2023-11-19 05:04:53,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2474 states to 2474 states and 3850 transitions. [2023-11-19 05:04:53,789 INFO L78 Accepts]: Start accepts. Automaton has 2474 states and 3850 transitions. Word has length 87 [2023-11-19 05:04:53,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:04:53,790 INFO L495 AbstractCegarLoop]: Abstraction has 2474 states and 3850 transitions. [2023-11-19 05:04:53,790 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 05:04:53,790 INFO L276 IsEmpty]: Start isEmpty. Operand 2474 states and 3850 transitions. [2023-11-19 05:04:53,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-19 05:04:53,795 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:04:53,796 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:04:53,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 05:04:53,796 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:04:53,797 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:04:53,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1294443877, now seen corresponding path program 1 times [2023-11-19 05:04:53,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:04:53,798 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402318311] [2023-11-19 05:04:53,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:04:53,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:04:53,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:04:54,260 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:04:54,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:04:54,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402318311] [2023-11-19 05:04:54,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402318311] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:04:54,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021343235] [2023-11-19 05:04:54,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:04:54,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:04:54,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:04:54,271 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:04:54,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:04:54,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:04:54,706 INFO L262 TraceCheckSpWp]: Trace formula consists of 1795 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:04:54,720 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:04:54,878 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:04:54,881 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:04:54,882 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021343235] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:04:54,882 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:04:54,882 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-19 05:04:54,883 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811782794] [2023-11-19 05:04:54,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:04:54,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:04:54,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:04:54,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:04:54,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:04:54,886 INFO L87 Difference]: Start difference. First operand 2474 states and 3850 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-11-19 05:04:55,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:04:55,430 INFO L93 Difference]: Finished difference Result 6967 states and 11236 transitions. [2023-11-19 05:04:55,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:04:55,431 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 86 [2023-11-19 05:04:55,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:04:55,490 INFO L225 Difference]: With dead ends: 6967 [2023-11-19 05:04:55,490 INFO L226 Difference]: Without dead ends: 4505 [2023-11-19 05:04:55,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:04:55,523 INFO L413 NwaCegarLoop]: 601 mSDtfsCounter, 565 mSDsluCounter, 504 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 1105 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:04:55,524 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [565 Valid, 1105 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:04:55,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4505 states. [2023-11-19 05:04:55,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4505 to 4295. [2023-11-19 05:04:55,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4295 states, 2983 states have (on average 1.499832383506537) internal successors, (4474), 3150 states have internal predecessors, (4474), 1015 states have call successors, (1015), 291 states have call predecessors, (1015), 296 states have return successors, (1264), 937 states have call predecessors, (1264), 1004 states have call successors, (1264) [2023-11-19 05:04:55,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4295 states to 4295 states and 6753 transitions. [2023-11-19 05:04:55,921 INFO L78 Accepts]: Start accepts. Automaton has 4295 states and 6753 transitions. Word has length 86 [2023-11-19 05:04:55,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:04:55,922 INFO L495 AbstractCegarLoop]: Abstraction has 4295 states and 6753 transitions. [2023-11-19 05:04:55,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-11-19 05:04:55,923 INFO L276 IsEmpty]: Start isEmpty. Operand 4295 states and 6753 transitions. [2023-11-19 05:04:55,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-11-19 05:04:55,927 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:04:55,927 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:04:55,951 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-19 05:04:56,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:04:56,151 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:04:56,151 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:04:56,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1478250807, now seen corresponding path program 1 times [2023-11-19 05:04:56,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:04:56,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112914591] [2023-11-19 05:04:56,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:04:56,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:04:56,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:04:56,551 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:04:56,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:04:56,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112914591] [2023-11-19 05:04:56,552 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112914591] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:04:56,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [354467139] [2023-11-19 05:04:56,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:04:56,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:04:56,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:04:56,555 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:04:56,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:04:56,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:04:56,960 INFO L262 TraceCheckSpWp]: Trace formula consists of 1796 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:04:56,975 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:04:57,073 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:04:57,074 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:04:57,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [354467139] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:04:57,075 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:04:57,075 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-19 05:04:57,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539432532] [2023-11-19 05:04:57,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:04:57,076 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:04:57,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:04:57,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:04:57,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:04:57,077 INFO L87 Difference]: Start difference. First operand 4295 states and 6753 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-11-19 05:04:57,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:04:57,647 INFO L93 Difference]: Finished difference Result 9753 states and 15625 transitions. [2023-11-19 05:04:57,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:04:57,648 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 87 [2023-11-19 05:04:57,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:04:57,706 INFO L225 Difference]: With dead ends: 9753 [2023-11-19 05:04:57,706 INFO L226 Difference]: Without dead ends: 5470 [2023-11-19 05:04:57,751 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:04:57,752 INFO L413 NwaCegarLoop]: 649 mSDtfsCounter, 562 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 1152 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:04:57,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [562 Valid, 1152 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:04:57,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5470 states. [2023-11-19 05:04:58,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5470 to 5316. [2023-11-19 05:04:58,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5316 states, 3709 states have (on average 1.5020221083850094) internal successors, (5571), 3920 states have internal predecessors, (5571), 1235 states have call successors, (1235), 354 states have call predecessors, (1235), 371 states have return successors, (1574), 1147 states have call predecessors, (1574), 1224 states have call successors, (1574) [2023-11-19 05:04:58,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5316 states to 5316 states and 8380 transitions. [2023-11-19 05:04:58,303 INFO L78 Accepts]: Start accepts. Automaton has 5316 states and 8380 transitions. Word has length 87 [2023-11-19 05:04:58,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:04:58,304 INFO L495 AbstractCegarLoop]: Abstraction has 5316 states and 8380 transitions. [2023-11-19 05:04:58,305 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-11-19 05:04:58,305 INFO L276 IsEmpty]: Start isEmpty. Operand 5316 states and 8380 transitions. [2023-11-19 05:04:58,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-11-19 05:04:58,314 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:04:58,314 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:04:58,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:04:58,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-19 05:04:58,538 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:04:58,538 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:04:58,538 INFO L85 PathProgramCache]: Analyzing trace with hash -325143608, now seen corresponding path program 1 times [2023-11-19 05:04:58,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:04:58,538 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386469349] [2023-11-19 05:04:58,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:04:58,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:04:58,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:04:59,496 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:04:59,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:04:59,496 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386469349] [2023-11-19 05:04:59,496 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386469349] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:04:59,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819819025] [2023-11-19 05:04:59,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:04:59,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:04:59,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:04:59,498 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:04:59,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:04:59,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:04:59,904 INFO L262 TraceCheckSpWp]: Trace formula consists of 1821 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 05:04:59,912 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:04:59,991 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:04:59,992 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:04:59,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819819025] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:04:59,992 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:04:59,992 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2023-11-19 05:04:59,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951425431] [2023-11-19 05:04:59,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:04:59,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:04:59,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:04:59,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:04:59,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:04:59,996 INFO L87 Difference]: Start difference. First operand 5316 states and 8380 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2023-11-19 05:05:00,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:00,882 INFO L93 Difference]: Finished difference Result 10485 states and 16892 transitions. [2023-11-19 05:05:00,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:05:00,883 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 92 [2023-11-19 05:05:00,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:00,957 INFO L225 Difference]: With dead ends: 10485 [2023-11-19 05:05:00,957 INFO L226 Difference]: Without dead ends: 6396 [2023-11-19 05:05:00,984 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:05:00,985 INFO L413 NwaCegarLoop]: 597 mSDtfsCounter, 177 mSDsluCounter, 1786 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 2383 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:00,986 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 2383 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:05:00,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6396 states. [2023-11-19 05:05:01,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6396 to 5361. [2023-11-19 05:05:01,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5361 states, 3754 states have (on average 1.4960042621204048) internal successors, (5616), 3965 states have internal predecessors, (5616), 1235 states have call successors, (1235), 354 states have call predecessors, (1235), 371 states have return successors, (1574), 1147 states have call predecessors, (1574), 1224 states have call successors, (1574) [2023-11-19 05:05:01,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5361 states to 5361 states and 8425 transitions. [2023-11-19 05:05:01,545 INFO L78 Accepts]: Start accepts. Automaton has 5361 states and 8425 transitions. Word has length 92 [2023-11-19 05:05:01,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:01,546 INFO L495 AbstractCegarLoop]: Abstraction has 5361 states and 8425 transitions. [2023-11-19 05:05:01,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2023-11-19 05:05:01,547 INFO L276 IsEmpty]: Start isEmpty. Operand 5361 states and 8425 transitions. [2023-11-19 05:05:01,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-11-19 05:05:01,552 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:01,553 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:01,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:01,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:01,775 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:01,776 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:01,776 INFO L85 PathProgramCache]: Analyzing trace with hash 219438648, now seen corresponding path program 1 times [2023-11-19 05:05:01,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:01,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901160946] [2023-11-19 05:05:01,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:01,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:01,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:02,852 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 05:05:02,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:02,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901160946] [2023-11-19 05:05:02,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901160946] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:05:02,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697141777] [2023-11-19 05:05:02,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:02,854 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:02,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:02,855 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:02,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:05:03,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:03,315 INFO L262 TraceCheckSpWp]: Trace formula consists of 1828 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 05:05:03,326 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:03,568 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:05:03,569 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:04,182 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:05:04,182 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697141777] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 05:05:04,183 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:04,183 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 9] total 22 [2023-11-19 05:05:04,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881140959] [2023-11-19 05:05:04,184 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:05:04,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 05:05:04,184 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:04,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 05:05:04,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=405, Unknown=0, NotChecked=0, Total=462 [2023-11-19 05:05:04,186 INFO L87 Difference]: Start difference. First operand 5361 states and 8425 transitions. Second operand has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 7 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) [2023-11-19 05:05:07,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:07,617 INFO L93 Difference]: Finished difference Result 10547 states and 16774 transitions. [2023-11-19 05:05:07,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-19 05:05:07,618 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 7 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) Word has length 95 [2023-11-19 05:05:07,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:07,694 INFO L225 Difference]: With dead ends: 10547 [2023-11-19 05:05:07,694 INFO L226 Difference]: Without dead ends: 6437 [2023-11-19 05:05:07,721 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 177 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=127, Invalid=865, Unknown=0, NotChecked=0, Total=992 [2023-11-19 05:05:07,722 INFO L413 NwaCegarLoop]: 627 mSDtfsCounter, 1166 mSDsluCounter, 1751 mSDsCounter, 0 mSdLazyCounter, 2059 mSolverCounterSat, 208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1253 SdHoareTripleChecker+Valid, 2378 SdHoareTripleChecker+Invalid, 2267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 208 IncrementalHoareTripleChecker+Valid, 2059 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:07,723 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1253 Valid, 2378 Invalid, 2267 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [208 Valid, 2059 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2023-11-19 05:05:07,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6437 states. [2023-11-19 05:05:08,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6437 to 5601. [2023-11-19 05:05:08,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5601 states, 3908 states have (on average 1.4820880245649948) internal successors, (5792), 4119 states have internal predecessors, (5792), 1276 states have call successors, (1276), 360 states have call predecessors, (1276), 416 states have return successors, (1746), 1224 states have call predecessors, (1746), 1265 states have call successors, (1746) [2023-11-19 05:05:08,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5601 states to 5601 states and 8814 transitions. [2023-11-19 05:05:08,536 INFO L78 Accepts]: Start accepts. Automaton has 5601 states and 8814 transitions. Word has length 95 [2023-11-19 05:05:08,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:08,538 INFO L495 AbstractCegarLoop]: Abstraction has 5601 states and 8814 transitions. [2023-11-19 05:05:08,538 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 7 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) [2023-11-19 05:05:08,539 INFO L276 IsEmpty]: Start isEmpty. Operand 5601 states and 8814 transitions. [2023-11-19 05:05:08,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-11-19 05:05:08,547 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:08,547 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:08,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:08,763 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-19 05:05:08,763 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:08,764 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:08,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1015073448, now seen corresponding path program 1 times [2023-11-19 05:05:08,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:08,764 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419910988] [2023-11-19 05:05:08,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:08,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:08,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:09,563 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 05:05:09,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:09,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419910988] [2023-11-19 05:05:09,564 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419910988] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:05:09,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226820879] [2023-11-19 05:05:09,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:09,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:09,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:09,566 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:09,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:05:09,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:09,968 INFO L262 TraceCheckSpWp]: Trace formula consists of 1826 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:05:09,973 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:10,018 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 05:05:10,019 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:05:10,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226820879] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:05:10,019 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:05:10,019 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 12 [2023-11-19 05:05:10,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264221278] [2023-11-19 05:05:10,019 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:05:10,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:05:10,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:10,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:05:10,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2023-11-19 05:05:10,021 INFO L87 Difference]: Start difference. First operand 5601 states and 8814 transitions. Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 3 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:05:10,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:10,738 INFO L93 Difference]: Finished difference Result 10491 states and 17034 transitions. [2023-11-19 05:05:10,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:05:10,739 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 3 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 98 [2023-11-19 05:05:10,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:10,781 INFO L225 Difference]: With dead ends: 10491 [2023-11-19 05:05:10,781 INFO L226 Difference]: Without dead ends: 6141 [2023-11-19 05:05:10,803 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:05:10,804 INFO L413 NwaCegarLoop]: 639 mSDtfsCounter, 219 mSDsluCounter, 982 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 1621 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:10,805 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 1621 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:05:10,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6141 states. [2023-11-19 05:05:11,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6141 to 6141. [2023-11-19 05:05:11,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6141 states, 4427 states have (on average 1.497854077253219) internal successors, (6631), 4659 states have internal predecessors, (6631), 1276 states have call successors, (1276), 360 states have call predecessors, (1276), 437 states have return successors, (1802), 1224 states have call predecessors, (1802), 1265 states have call successors, (1802) [2023-11-19 05:05:11,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6141 states to 6141 states and 9709 transitions. [2023-11-19 05:05:11,414 INFO L78 Accepts]: Start accepts. Automaton has 6141 states and 9709 transitions. Word has length 98 [2023-11-19 05:05:11,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:11,415 INFO L495 AbstractCegarLoop]: Abstraction has 6141 states and 9709 transitions. [2023-11-19 05:05:11,415 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 3 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:05:11,415 INFO L276 IsEmpty]: Start isEmpty. Operand 6141 states and 9709 transitions. [2023-11-19 05:05:11,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2023-11-19 05:05:11,422 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:11,423 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:11,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:11,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-19 05:05:11,643 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:11,644 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:11,644 INFO L85 PathProgramCache]: Analyzing trace with hash 2081939252, now seen corresponding path program 1 times [2023-11-19 05:05:11,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:11,644 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023665275] [2023-11-19 05:05:11,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:11,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:11,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:12,522 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 05:05:12,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:12,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023665275] [2023-11-19 05:05:12,523 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023665275] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:05:12,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634610602] [2023-11-19 05:05:12,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:12,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:12,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:12,525 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:12,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:05:12,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:12,980 INFO L262 TraceCheckSpWp]: Trace formula consists of 1826 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-19 05:05:12,990 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:13,305 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:05:13,306 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:13,832 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-19 05:05:13,833 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634610602] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 05:05:13,833 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:13,833 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [10, 9] total 21 [2023-11-19 05:05:13,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788137917] [2023-11-19 05:05:13,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:05:13,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-19 05:05:13,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:13,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-19 05:05:13,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2023-11-19 05:05:13,837 INFO L87 Difference]: Start difference. First operand 6141 states and 9709 transitions. Second operand has 10 states, 9 states have (on average 6.444444444444445) internal successors, (58), 9 states have internal predecessors, (58), 5 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (17), 6 states have call predecessors, (17), 4 states have call successors, (17) [2023-11-19 05:05:19,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:19,363 INFO L93 Difference]: Finished difference Result 17783 states and 30826 transitions. [2023-11-19 05:05:19,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-19 05:05:19,364 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 6.444444444444445) internal successors, (58), 9 states have internal predecessors, (58), 5 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (17), 6 states have call predecessors, (17), 4 states have call successors, (17) Word has length 97 [2023-11-19 05:05:19,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:19,588 INFO L225 Difference]: With dead ends: 17783 [2023-11-19 05:05:19,589 INFO L226 Difference]: Without dead ends: 13589 [2023-11-19 05:05:19,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=196, Invalid=1136, Unknown=0, NotChecked=0, Total=1332 [2023-11-19 05:05:19,627 INFO L413 NwaCegarLoop]: 667 mSDtfsCounter, 3516 mSDsluCounter, 2585 mSDsCounter, 0 mSdLazyCounter, 2415 mSolverCounterSat, 1599 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3615 SdHoareTripleChecker+Valid, 3252 SdHoareTripleChecker+Invalid, 4014 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1599 IncrementalHoareTripleChecker+Valid, 2415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:19,629 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3615 Valid, 3252 Invalid, 4014 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1599 Valid, 2415 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2023-11-19 05:05:19,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13589 states. [2023-11-19 05:05:20,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13589 to 12128. [2023-11-19 05:05:20,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12128 states, 8883 states have (on average 1.5074862096138693) internal successors, (13391), 9288 states have internal predecessors, (13391), 2354 states have call successors, (2354), 684 states have call predecessors, (2354), 890 states have return successors, (4331), 2315 states have call predecessors, (4331), 2337 states have call successors, (4331) [2023-11-19 05:05:20,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12128 states to 12128 states and 20076 transitions. [2023-11-19 05:05:20,911 INFO L78 Accepts]: Start accepts. Automaton has 12128 states and 20076 transitions. Word has length 97 [2023-11-19 05:05:20,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:20,912 INFO L495 AbstractCegarLoop]: Abstraction has 12128 states and 20076 transitions. [2023-11-19 05:05:20,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 6.444444444444445) internal successors, (58), 9 states have internal predecessors, (58), 5 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (17), 6 states have call predecessors, (17), 4 states have call successors, (17) [2023-11-19 05:05:20,913 INFO L276 IsEmpty]: Start isEmpty. Operand 12128 states and 20076 transitions. [2023-11-19 05:05:20,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-11-19 05:05:20,931 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:20,932 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:20,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:21,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 05:05:21,147 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:21,148 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:21,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1636803934, now seen corresponding path program 1 times [2023-11-19 05:05:21,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:21,148 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625355753] [2023-11-19 05:05:21,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:21,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:21,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:22,149 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 05:05:22,150 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:22,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625355753] [2023-11-19 05:05:22,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625355753] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:05:22,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968370631] [2023-11-19 05:05:22,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:22,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:22,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:22,152 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:22,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d358053-1c48-4da0-b957-fd4a81b6eee1/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:05:22,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:22,612 INFO L262 TraceCheckSpWp]: Trace formula consists of 1843 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 05:05:22,619 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:22,773 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:05:22,773 INFO L327 TraceCheckSpWp]: Computing backward predicates...