./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/eureka_01-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 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_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/eureka_01-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire --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 fc84672deb8568f357f3e53d1889a4a141611ae62422dd83eb7a6bc6f311a8b1 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:20:29,272 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:20:29,373 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:20:29,382 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:20:29,383 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:20:29,427 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:20:29,428 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:20:29,428 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:20:29,430 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:20:29,435 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:20:29,436 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:20:29,437 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:20:29,438 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:20:29,440 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:20:29,440 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:20:29,441 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:20:29,441 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:20:29,442 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:20:29,442 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:20:29,443 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:20:29,443 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:20:29,444 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:20:29,445 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:20:29,446 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:20:29,446 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:20:29,446 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:20:29,447 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:20:29,447 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:20:29,448 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:20:29,448 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:20:29,450 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:20:29,450 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:20:29,451 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:20:29,452 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:20:29,452 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:20:29,452 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:20:29,453 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:20:29,453 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:20:29,453 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:20:29,454 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:20:29,454 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:20:29,454 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:20:29,455 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:20:29,455 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:20:29,455 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:20:29,456 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:20:29,456 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:20:29,456 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_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fc84672deb8568f357f3e53d1889a4a141611ae62422dd83eb7a6bc6f311a8b1 [2023-11-23 21:20:29,738 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:20:29,784 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:20:29,787 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:20:29,789 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:20:29,790 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:20:29,791 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/loops/eureka_01-2.c [2023-11-23 21:20:32,865 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:20:33,057 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:20:33,058 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/sv-benchmarks/c/loops/eureka_01-2.c [2023-11-23 21:20:33,068 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/data/f74f0108e/57508ff9f71c4cca8ae8043f4d7433e7/FLAG0e538d232 [2023-11-23 21:20:33,084 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/data/f74f0108e/57508ff9f71c4cca8ae8043f4d7433e7 [2023-11-23 21:20:33,087 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:20:33,088 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:20:33,090 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:20:33,090 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:20:33,096 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:20:33,097 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,098 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@188e2d1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33, skipping insertion in model container [2023-11-23 21:20:33,099 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,123 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:20:33,305 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_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/sv-benchmarks/c/loops/eureka_01-2.c[323,336] [2023-11-23 21:20:33,364 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:20:33,376 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:20:33,389 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_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/sv-benchmarks/c/loops/eureka_01-2.c[323,336] [2023-11-23 21:20:33,423 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:20:33,454 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:20:33,455 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33 WrapperNode [2023-11-23 21:20:33,455 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:20:33,457 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:20:33,457 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:20:33,458 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:20:33,466 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,492 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,537 INFO L138 Inliner]: procedures = 13, calls = 100, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 198 [2023-11-23 21:20:33,537 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:20:33,538 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:20:33,538 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:20:33,538 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:20:33,549 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,549 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,553 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,554 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,570 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,575 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,577 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,578 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,582 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:20:33,583 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:20:33,583 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:20:33,583 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:20:33,584 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (1/1) ... [2023-11-23 21:20:33,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:20:33,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:20:33,635 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:20:33,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:20:33,683 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:20:33,683 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:20:33,684 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:20:33,684 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:20:33,684 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:20:33,684 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:20:33,684 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:20:33,685 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:20:33,782 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:20:33,785 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:20:34,197 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:20:34,369 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:20:34,369 INFO L309 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-23 21:20:34,371 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:20:34 BoogieIcfgContainer [2023-11-23 21:20:34,372 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:20:34,374 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:20:34,375 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:20:34,385 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:20:34,386 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:20:33" (1/3) ... [2023-11-23 21:20:34,386 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14bde2b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:20:34, skipping insertion in model container [2023-11-23 21:20:34,387 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:20:33" (2/3) ... [2023-11-23 21:20:34,389 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14bde2b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:20:34, skipping insertion in model container [2023-11-23 21:20:34,390 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:20:34" (3/3) ... [2023-11-23 21:20:34,391 INFO L112 eAbstractionObserver]: Analyzing ICFG eureka_01-2.c [2023-11-23 21:20:34,415 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:20:34,416 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:20:34,490 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:20:34,499 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;@2484d1f8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:20:34,500 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:20:34,505 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:34,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 21:20:34,513 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:34,514 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:34,515 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:34,522 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:34,522 INFO L85 PathProgramCache]: Analyzing trace with hash -681000216, now seen corresponding path program 1 times [2023-11-23 21:20:34,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:34,535 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164333203] [2023-11-23 21:20:34,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:34,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:34,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:35,012 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:20:35,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:20:35,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164333203] [2023-11-23 21:20:35,014 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164333203] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:20:35,014 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:20:35,014 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:20:35,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807655873] [2023-11-23 21:20:35,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:20:35,021 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:20:35,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:20:35,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:20:35,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:20:35,053 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:20:35,111 INFO L93 Difference]: Finished difference Result 25 states and 37 transitions. [2023-11-23 21:20:35,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:20:35,114 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-23 21:20:35,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:20:35,122 INFO L225 Difference]: With dead ends: 25 [2023-11-23 21:20:35,123 INFO L226 Difference]: Without dead ends: 12 [2023-11-23 21:20:35,126 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:20:35,130 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:20:35,131 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:20:35,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-23 21:20:35,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-11-23 21:20:35,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 16 transitions. [2023-11-23 21:20:35,162 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 16 transitions. Word has length 7 [2023-11-23 21:20:35,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:20:35,163 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 16 transitions. [2023-11-23 21:20:35,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,163 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 16 transitions. [2023-11-23 21:20:35,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 21:20:35,164 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:35,164 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:35,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:20:35,165 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:35,165 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:35,165 INFO L85 PathProgramCache]: Analyzing trace with hash 1056138798, now seen corresponding path program 1 times [2023-11-23 21:20:35,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:35,166 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999915118] [2023-11-23 21:20:35,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:35,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:35,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:35,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:20:35,364 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:20:35,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999915118] [2023-11-23 21:20:35,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999915118] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:20:35,365 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:20:35,365 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:20:35,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288458754] [2023-11-23 21:20:35,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:20:35,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:20:35,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:20:35,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:20:35,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:20:35,368 INFO L87 Difference]: Start difference. First operand 12 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:20:35,446 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2023-11-23 21:20:35,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:20:35,447 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-23 21:20:35,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:20:35,447 INFO L225 Difference]: With dead ends: 28 [2023-11-23 21:20:35,448 INFO L226 Difference]: Without dead ends: 21 [2023-11-23 21:20:35,448 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:20:35,450 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:20:35,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 6 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:20:35,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-23 21:20:35,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 13. [2023-11-23 21:20:35,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 17 transitions. [2023-11-23 21:20:35,456 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 17 transitions. Word has length 8 [2023-11-23 21:20:35,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:20:35,457 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 17 transitions. [2023-11-23 21:20:35,457 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,457 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 17 transitions. [2023-11-23 21:20:35,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:20:35,458 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:35,458 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:35,459 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:20:35,459 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:35,460 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:35,460 INFO L85 PathProgramCache]: Analyzing trace with hash -881335721, now seen corresponding path program 1 times [2023-11-23 21:20:35,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:35,460 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570713492] [2023-11-23 21:20:35,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:35,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:35,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:35,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:20:35,587 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:20:35,587 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570713492] [2023-11-23 21:20:35,587 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570713492] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:20:35,588 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:20:35,588 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:20:35,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585506924] [2023-11-23 21:20:35,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:20:35,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:20:35,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:20:35,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:20:35,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:20:35,590 INFO L87 Difference]: Start difference. First operand 13 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:20:35,628 INFO L93 Difference]: Finished difference Result 23 states and 31 transitions. [2023-11-23 21:20:35,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:20:35,628 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-23 21:20:35,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:20:35,629 INFO L225 Difference]: With dead ends: 23 [2023-11-23 21:20:35,629 INFO L226 Difference]: Without dead ends: 14 [2023-11-23 21:20:35,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:20:35,631 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 12 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:20:35,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 9 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:20:35,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-23 21:20:35,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-23 21:20:35,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 18 transitions. [2023-11-23 21:20:35,637 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 18 transitions. Word has length 10 [2023-11-23 21:20:35,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:20:35,638 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 18 transitions. [2023-11-23 21:20:35,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,638 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 18 transitions. [2023-11-23 21:20:35,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:20:35,639 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:35,639 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:35,639 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:20:35,639 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:35,640 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:35,640 INFO L85 PathProgramCache]: Analyzing trace with hash 1172780514, now seen corresponding path program 1 times [2023-11-23 21:20:35,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:35,641 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678061565] [2023-11-23 21:20:35,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:35,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:35,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:35,799 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:20:35,799 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:20:35,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678061565] [2023-11-23 21:20:35,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678061565] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:20:35,801 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:20:35,801 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:20:35,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554915042] [2023-11-23 21:20:35,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:20:35,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:20:35,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:20:35,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:20:35,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:20:35,805 INFO L87 Difference]: Start difference. First operand 14 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:20:35,871 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2023-11-23 21:20:35,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:20:35,872 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-23 21:20:35,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:20:35,876 INFO L225 Difference]: With dead ends: 28 [2023-11-23 21:20:35,876 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:20:35,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:20:35,879 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:20:35,880 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 6 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:20:35,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:20:35,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2023-11-23 21:20:35,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2023-11-23 21:20:35,887 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 11 [2023-11-23 21:20:35,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:20:35,887 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2023-11-23 21:20:35,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:35,888 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2023-11-23 21:20:35,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-23 21:20:35,888 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:35,888 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:35,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:20:35,889 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:35,889 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:35,889 INFO L85 PathProgramCache]: Analyzing trace with hash 351257804, now seen corresponding path program 1 times [2023-11-23 21:20:35,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:35,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871719290] [2023-11-23 21:20:35,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:35,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:35,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:35,997 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:20:35,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:20:35,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871719290] [2023-11-23 21:20:35,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871719290] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:20:35,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [739676676] [2023-11-23 21:20:35,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:35,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:20:35,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:20:36,005 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:20:36,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:20:36,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:36,169 INFO L262 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:20:36,174 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:20:36,268 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:20:36,268 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:20:36,300 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:20:36,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [739676676] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:20:36,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1068427300] [2023-11-23 21:20:36,327 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 21:20:36,328 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:20:36,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:20:36,337 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:20:36,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:20:41,102 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:20:41,585 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '346#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem21#1| 1) 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~nodecount~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#distance~0#1.base|) |ULTIMATE.start_main_~#distance~0#1.offset|) |ULTIMATE.start_main_#t~mem21#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:20:41,585 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:20:41,586 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:20:41,586 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2023-11-23 21:20:41,586 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055885439] [2023-11-23 21:20:41,586 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:20:41,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 21:20:41,587 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:20:41,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 21:20:41,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2023-11-23 21:20:41,589 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:41,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:20:41,655 INFO L93 Difference]: Finished difference Result 30 states and 40 transitions. [2023-11-23 21:20:41,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:20:41,656 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-23 21:20:41,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:20:41,657 INFO L225 Difference]: With dead ends: 30 [2023-11-23 21:20:41,657 INFO L226 Difference]: Without dead ends: 18 [2023-11-23 21:20:41,658 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2023-11-23 21:20:41,659 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 4 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:20:41,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:20:41,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-23 21:20:41,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-11-23 21:20:41,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:41,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2023-11-23 21:20:41,665 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 13 [2023-11-23 21:20:41,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:20:41,666 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2023-11-23 21:20:41,666 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:41,666 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2023-11-23 21:20:41,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-23 21:20:41,667 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:41,667 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:41,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:20:41,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:20:41,881 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:41,881 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:41,881 INFO L85 PathProgramCache]: Analyzing trace with hash 1190173394, now seen corresponding path program 2 times [2023-11-23 21:20:41,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:41,882 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640992724] [2023-11-23 21:20:41,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:41,882 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:41,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:42,065 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:20:42,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:20:42,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640992724] [2023-11-23 21:20:42,066 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640992724] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:20:42,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68057783] [2023-11-23 21:20:42,067 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:20:42,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:20:42,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:20:42,069 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:20:42,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:20:42,174 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:20:42,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:20:42,176 INFO L262 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:20:42,178 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:20:42,226 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:20:42,226 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:20:42,270 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:20:42,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68057783] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:20:42,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1759435714] [2023-11-23 21:20:42,275 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 21:20:42,275 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:20:42,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:20:42,276 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:20:42,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:20:45,559 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:20:46,039 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '534#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem21#1| 1) 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~nodecount~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#distance~0#1.base|) |ULTIMATE.start_main_~#distance~0#1.offset|) |ULTIMATE.start_main_#t~mem21#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:20:46,039 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:20:46,039 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:20:46,039 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4] total 10 [2023-11-23 21:20:46,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439918761] [2023-11-23 21:20:46,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:20:46,040 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:20:46,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:20:46,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:20:46,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2023-11-23 21:20:46,042 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 11 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:46,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:20:46,216 INFO L93 Difference]: Finished difference Result 73 states and 93 transitions. [2023-11-23 21:20:46,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:20:46,217 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-23 21:20:46,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:20:46,219 INFO L225 Difference]: With dead ends: 73 [2023-11-23 21:20:46,219 INFO L226 Difference]: Without dead ends: 61 [2023-11-23 21:20:46,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2023-11-23 21:20:46,221 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 93 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:20:46,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 18 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:20:46,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-23 21:20:46,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 31. [2023-11-23 21:20:46,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:46,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2023-11-23 21:20:46,239 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 16 [2023-11-23 21:20:46,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:20:46,239 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2023-11-23 21:20:46,240 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:46,240 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2023-11-23 21:20:46,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-23 21:20:46,241 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:46,241 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:46,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:20:46,448 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 21:20:46,449 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:46,449 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:46,449 INFO L85 PathProgramCache]: Analyzing trace with hash -481419444, now seen corresponding path program 3 times [2023-11-23 21:20:46,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:46,450 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104553536] [2023-11-23 21:20:46,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:46,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:46,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:46,614 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-23 21:20:46,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:20:46,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104553536] [2023-11-23 21:20:46,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104553536] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:20:46,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135439850] [2023-11-23 21:20:46,614 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:20:46,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:20:46,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:20:46,616 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:20:46,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:20:47,012 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:20:47,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:20:47,015 INFO L262 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:20:47,017 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:20:47,050 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-23 21:20:47,051 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:20:47,088 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-23 21:20:47,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135439850] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:20:47,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1328154330] [2023-11-23 21:20:47,091 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 21:20:47,092 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:20:47,092 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:20:47,092 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:20:47,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:20:49,483 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:20:49,905 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '896#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem21#1| 1) 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~nodecount~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#distance~0#1.base|) |ULTIMATE.start_main_~#distance~0#1.offset|) |ULTIMATE.start_main_#t~mem21#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:20:49,906 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:20:49,906 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:20:49,906 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2023-11-23 21:20:49,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638436882] [2023-11-23 21:20:49,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:20:49,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-23 21:20:49,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:20:49,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-23 21:20:49,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2023-11-23 21:20:49,908 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:49,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:20:49,977 INFO L93 Difference]: Finished difference Result 67 states and 96 transitions. [2023-11-23 21:20:49,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:20:49,977 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2023-11-23 21:20:49,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:20:49,978 INFO L225 Difference]: With dead ends: 67 [2023-11-23 21:20:49,978 INFO L226 Difference]: Without dead ends: 46 [2023-11-23 21:20:49,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2023-11-23 21:20:49,980 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:20:49,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 9 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:20:49,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-23 21:20:49,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-11-23 21:20:49,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.2) internal successors, (54), 45 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:49,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2023-11-23 21:20:49,991 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 29 [2023-11-23 21:20:49,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:20:49,992 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2023-11-23 21:20:49,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:49,992 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2023-11-23 21:20:49,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-23 21:20:49,993 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:49,993 INFO L195 NwaCegarLoop]: trace histogram [20, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:50,012 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-23 21:20:50,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 21:20:50,205 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:50,205 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:50,205 INFO L85 PathProgramCache]: Analyzing trace with hash 1993971813, now seen corresponding path program 4 times [2023-11-23 21:20:50,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:50,205 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373167379] [2023-11-23 21:20:50,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:50,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:50,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:50,496 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 105 proven. 10 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2023-11-23 21:20:50,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:20:50,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373167379] [2023-11-23 21:20:50,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373167379] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:20:50,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85002725] [2023-11-23 21:20:50,497 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:20:50,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:20:50,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:20:50,501 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:20:50,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:20:50,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:50,689 INFO L262 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 21:20:50,693 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:20:50,770 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 105 proven. 10 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2023-11-23 21:20:50,771 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:20:50,867 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 105 proven. 10 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2023-11-23 21:20:50,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [85002725] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:20:50,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1203261239] [2023-11-23 21:20:50,870 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 21:20:50,870 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:20:50,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:20:50,871 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:20:50,871 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:20:52,369 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:20:52,680 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1394#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem21#1| 1) 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~nodecount~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#distance~0#1.base|) |ULTIMATE.start_main_~#distance~0#1.offset|) |ULTIMATE.start_main_#t~mem21#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:20:52,680 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:20:52,680 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:20:52,680 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2023-11-23 21:20:52,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060530081] [2023-11-23 21:20:52,681 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:20:52,681 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-23 21:20:52,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:20:52,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-23 21:20:52,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=528, Unknown=0, NotChecked=0, Total=702 [2023-11-23 21:20:52,683 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:52,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:20:52,860 INFO L93 Difference]: Finished difference Result 109 states and 153 transitions. [2023-11-23 21:20:52,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 21:20:52,861 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2023-11-23 21:20:52,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:20:52,862 INFO L225 Difference]: With dead ends: 109 [2023-11-23 21:20:52,862 INFO L226 Difference]: Without dead ends: 76 [2023-11-23 21:20:52,863 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=249, Invalid=743, Unknown=0, NotChecked=0, Total=992 [2023-11-23 21:20:52,864 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 34 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:20:52,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 21 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:20:52,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-23 21:20:52,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2023-11-23 21:20:52,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.12) internal successors, (84), 75 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:52,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 84 transitions. [2023-11-23 21:20:52,883 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 84 transitions. Word has length 44 [2023-11-23 21:20:52,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:20:52,883 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 84 transitions. [2023-11-23 21:20:52,884 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:52,884 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 84 transitions. [2023-11-23 21:20:52,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2023-11-23 21:20:52,886 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:52,886 INFO L195 NwaCegarLoop]: trace histogram [50, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:52,904 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:20:53,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:20:53,091 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:53,092 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:53,092 INFO L85 PathProgramCache]: Analyzing trace with hash 172687749, now seen corresponding path program 5 times [2023-11-23 21:20:53,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:53,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935577194] [2023-11-23 21:20:53,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:53,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:53,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:53,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1516 backedges. 489 proven. 55 refuted. 0 times theorem prover too weak. 972 trivial. 0 not checked. [2023-11-23 21:20:53,890 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:20:53,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935577194] [2023-11-23 21:20:53,891 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935577194] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:20:53,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934934158] [2023-11-23 21:20:53,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:20:53,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:20:53,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:20:53,893 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:20:53,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:20:54,087 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:20:54,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:20:54,089 INFO L262 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:20:54,100 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:20:54,231 INFO L134 CoverageAnalysis]: Checked inductivity of 1516 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1515 trivial. 0 not checked. [2023-11-23 21:20:54,232 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:20:54,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1516 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1515 trivial. 0 not checked. [2023-11-23 21:20:54,385 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934934158] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:20:54,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1156138371] [2023-11-23 21:20:54,388 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 21:20:54,388 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:20:54,388 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:20:54,389 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:20:54,389 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:20:56,929 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:20:57,458 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2222#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem21#1| 1) 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~nodecount~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#distance~0#1.base|) |ULTIMATE.start_main_~#distance~0#1.offset|) |ULTIMATE.start_main_#t~mem21#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:20:57,458 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:20:57,459 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:20:57,459 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 4, 4] total 18 [2023-11-23 21:20:57,459 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287631212] [2023-11-23 21:20:57,459 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:20:57,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-23 21:20:57,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:20:57,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-23 21:20:57,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=570, Unknown=0, NotChecked=0, Total=702 [2023-11-23 21:20:57,462 INFO L87 Difference]: Start difference. First operand 76 states and 84 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:58,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:20:58,931 INFO L93 Difference]: Finished difference Result 164 states and 186 transitions. [2023-11-23 21:20:58,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2023-11-23 21:20:58,931 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2023-11-23 21:20:58,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:20:58,932 INFO L225 Difference]: With dead ends: 164 [2023-11-23 21:20:58,933 INFO L226 Difference]: Without dead ends: 107 [2023-11-23 21:20:58,937 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1916 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1801, Invalid=5005, Unknown=0, NotChecked=0, Total=6806 [2023-11-23 21:20:58,937 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 126 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:20:58,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 27 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:20:58,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-11-23 21:20:58,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 87. [2023-11-23 21:20:58,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.1046511627906976) internal successors, (95), 86 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:58,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 95 transitions. [2023-11-23 21:20:58,962 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 95 transitions. Word has length 74 [2023-11-23 21:20:58,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:20:58,962 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 95 transitions. [2023-11-23 21:20:58,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:20:58,963 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 95 transitions. [2023-11-23 21:20:58,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2023-11-23 21:20:58,964 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:58,964 INFO L195 NwaCegarLoop]: trace histogram [55, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:58,992 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-23 21:20:59,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:20:59,180 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:59,181 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:59,181 INFO L85 PathProgramCache]: Analyzing trace with hash 199919658, now seen corresponding path program 6 times [2023-11-23 21:20:59,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:59,181 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11665784] [2023-11-23 21:20:59,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:59,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:59,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:00,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1816 backedges. 581 proven. 66 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2023-11-23 21:21:00,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:00,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11665784] [2023-11-23 21:21:00,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11665784] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:00,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638423685] [2023-11-23 21:21:00,048 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:21:00,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:00,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:00,050 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:00,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:21:00,365 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:21:00,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:21:00,370 INFO L262 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-23 21:21:00,376 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:00,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1816 backedges. 60 proven. 555 refuted. 0 times theorem prover too weak. 1201 trivial. 0 not checked. [2023-11-23 21:21:00,781 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:01,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1816 backedges. 60 proven. 555 refuted. 0 times theorem prover too weak. 1201 trivial. 0 not checked. [2023-11-23 21:21:01,199 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638423685] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:21:01,199 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [710158974] [2023-11-23 21:21:01,201 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 21:21:01,201 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:01,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:01,201 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:01,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:21:03,448 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:21:03,929 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3353#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem21#1| 1) 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~nodecount~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#distance~0#1.base|) |ULTIMATE.start_main_~#distance~0#1.offset|) |ULTIMATE.start_main_#t~mem21#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:21:03,930 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:21:03,930 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:21:03,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19] total 44 [2023-11-23 21:21:03,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438407130] [2023-11-23 21:21:03,930 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:21:03,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-11-23 21:21:03,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:03,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-11-23 21:21:03,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=2169, Unknown=0, NotChecked=0, Total=2550 [2023-11-23 21:21:03,934 INFO L87 Difference]: Start difference. First operand 87 states and 95 transitions. Second operand has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:07,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:07,970 INFO L93 Difference]: Finished difference Result 309 states and 356 transitions. [2023-11-23 21:21:07,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 156 states. [2023-11-23 21:21:07,970 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2023-11-23 21:21:07,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:07,972 INFO L225 Difference]: With dead ends: 309 [2023-11-23 21:21:07,973 INFO L226 Difference]: Without dead ends: 242 [2023-11-23 21:21:07,985 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 213 SyntacticMatches, 5 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13818 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6239, Invalid=34767, Unknown=0, NotChecked=0, Total=41006 [2023-11-23 21:21:07,986 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 949 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 949 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:07,986 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [949 Valid, 39 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:21:07,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2023-11-23 21:21:08,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 104. [2023-11-23 21:21:08,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.087378640776699) internal successors, (112), 103 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:08,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 112 transitions. [2023-11-23 21:21:08,025 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 112 transitions. Word has length 85 [2023-11-23 21:21:08,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:08,025 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 112 transitions. [2023-11-23 21:21:08,025 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:08,026 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 112 transitions. [2023-11-23 21:21:08,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-11-23 21:21:08,027 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:08,028 INFO L195 NwaCegarLoop]: trace histogram [60, 10, 10, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:08,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:21:08,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:08,245 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:08,245 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:08,245 INFO L85 PathProgramCache]: Analyzing trace with hash 281811807, now seen corresponding path program 7 times [2023-11-23 21:21:08,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:08,246 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499762561] [2023-11-23 21:21:08,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:08,246 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:08,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:09,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2210 backedges. 681 proven. 78 refuted. 0 times theorem prover too weak. 1451 trivial. 0 not checked. [2023-11-23 21:21:09,110 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:09,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499762561] [2023-11-23 21:21:09,110 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [499762561] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:09,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504968272] [2023-11-23 21:21:09,110 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:21:09,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:09,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:09,113 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:09,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:21:09,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:09,513 INFO L262 TraceCheckSpWp]: Trace formula consists of 1092 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-23 21:21:09,521 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:09,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2210 backedges. 681 proven. 78 refuted. 0 times theorem prover too weak. 1451 trivial. 0 not checked. [2023-11-23 21:21:09,737 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:09,978 INFO L134 CoverageAnalysis]: Checked inductivity of 2210 backedges. 681 proven. 78 refuted. 0 times theorem prover too weak. 1451 trivial. 0 not checked. [2023-11-23 21:21:09,978 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504968272] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:21:09,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1824190453] [2023-11-23 21:21:09,981 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 21:21:09,981 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:09,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:09,981 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:09,982 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:21:11,598 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:21:11,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5055#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem21#1| 1) 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~nodecount~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#distance~0#1.base|) |ULTIMATE.start_main_~#distance~0#1.offset|) |ULTIMATE.start_main_#t~mem21#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:21:11,961 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:21:11,961 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:21:11,962 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 36 [2023-11-23 21:21:11,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558945057] [2023-11-23 21:21:11,962 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:21:11,963 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-11-23 21:21:11,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:11,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-11-23 21:21:11,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=596, Invalid=1384, Unknown=0, NotChecked=0, Total=1980 [2023-11-23 21:21:11,965 INFO L87 Difference]: Start difference. First operand 104 states and 112 transitions. Second operand has 37 states, 37 states have (on average 1.4324324324324325) internal successors, (53), 36 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:12,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:12,231 INFO L93 Difference]: Finished difference Result 227 states and 281 transitions. [2023-11-23 21:21:12,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-23 21:21:12,232 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.4324324324324325) internal successors, (53), 36 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2023-11-23 21:21:12,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:12,234 INFO L225 Difference]: With dead ends: 227 [2023-11-23 21:21:12,234 INFO L226 Difference]: Without dead ends: 144 [2023-11-23 21:21:12,236 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 270 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1357 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=771, Invalid=1881, Unknown=0, NotChecked=0, Total=2652 [2023-11-23 21:21:12,237 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 38 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:12,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 17 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:21:12,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2023-11-23 21:21:12,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2023-11-23 21:21:12,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.062937062937063) internal successors, (152), 143 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:12,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 152 transitions. [2023-11-23 21:21:12,282 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 152 transitions. Word has length 102 [2023-11-23 21:21:12,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:12,283 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 152 transitions. [2023-11-23 21:21:12,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.4324324324324325) internal successors, (53), 36 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:12,283 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 152 transitions. [2023-11-23 21:21:12,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-11-23 21:21:12,286 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:12,286 INFO L195 NwaCegarLoop]: trace histogram [100, 10, 10, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:12,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:21:12,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-23 21:21:12,502 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:12,503 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:12,503 INFO L85 PathProgramCache]: Analyzing trace with hash -811029281, now seen corresponding path program 8 times [2023-11-23 21:21:12,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:12,503 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503291802] [2023-11-23 21:21:12,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:12,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:12,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:13,953 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5490 trivial. 0 not checked. [2023-11-23 21:21:13,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:13,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503291802] [2023-11-23 21:21:13,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503291802] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:13,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1722625742] [2023-11-23 21:21:13,954 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:21:13,954 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:13,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:13,956 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:13,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f44198e7-f91a-4f4e-bab4-543d32d6ab3d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:21:22,701 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-11-23 21:21:22,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:21:22,713 INFO L262 TraceCheckSpWp]: Trace formula consists of 606 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-23 21:21:22,720 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:23,031 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5490 trivial. 0 not checked. [2023-11-23 21:21:23,032 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:23,436 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5490 trivial. 0 not checked. [2023-11-23 21:21:23,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1722625742] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:21:23,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1492549427] [2023-11-23 21:21:23,439 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 21:21:23,439 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:23,439 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:23,440 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:23,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs