./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/heap-data/packet_filter.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/heap-data/packet_filter.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d604fdd8f7c4d34db0106d8a0ff422218ae80e9ee6eb03f691b84d2fcc8ad49f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:59:29,588 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:59:29,731 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:59:29,745 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:59:29,746 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:59:29,811 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:59:29,812 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:59:29,813 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:59:29,814 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:59:29,823 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:59:29,824 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:59:29,825 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:59:29,827 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:59:29,829 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:59:29,830 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:59:29,830 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:59:29,831 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:59:29,832 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:59:29,832 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:59:29,833 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:59:29,833 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:59:29,834 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:59:29,836 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:59:29,836 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:59:29,837 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:59:29,838 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:59:29,838 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:59:29,839 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:59:29,839 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:59:29,840 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:59:29,842 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:59:29,842 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:59:29,842 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:59:29,843 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:59:29,843 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:59:29,843 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:59:29,844 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:59:29,844 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:59:29,845 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:59:29,845 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:59:29,845 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:59:29,846 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:59:29,846 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:59:29,846 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:59:29,847 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:59:29,848 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_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d604fdd8f7c4d34db0106d8a0ff422218ae80e9ee6eb03f691b84d2fcc8ad49f [2023-11-12 00:59:30,181 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:59:30,221 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:59:30,225 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:59:30,227 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:59:30,227 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:59:30,230 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/heap-data/packet_filter.i [2023-11-12 00:59:33,627 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:59:33,936 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:59:33,937 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/sv-benchmarks/c/heap-data/packet_filter.i [2023-11-12 00:59:33,953 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/data/6d874750e/f99687e122fc4136872eff5bf0f65dc2/FLAG1336b0fb7 [2023-11-12 00:59:33,969 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/data/6d874750e/f99687e122fc4136872eff5bf0f65dc2 [2023-11-12 00:59:33,972 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:59:33,974 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:59:33,976 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:59:33,976 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:59:33,981 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:59:33,982 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:59:33" (1/1) ... [2023-11-12 00:59:33,984 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32390dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:33, skipping insertion in model container [2023-11-12 00:59:33,984 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:59:33" (1/1) ... [2023-11-12 00:59:34,031 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:59:34,348 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_2a8f2ba4-70be-4354-a661-483f4597416a/sv-benchmarks/c/heap-data/packet_filter.i[23925,23938] [2023-11-12 00:59:34,358 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_2a8f2ba4-70be-4354-a661-483f4597416a/sv-benchmarks/c/heap-data/packet_filter.i[24159,24172] [2023-11-12 00:59:34,366 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:59:34,379 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:59:34,425 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/sv-benchmarks/c/heap-data/packet_filter.i[23925,23938] [2023-11-12 00:59:34,428 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_2a8f2ba4-70be-4354-a661-483f4597416a/sv-benchmarks/c/heap-data/packet_filter.i[24159,24172] [2023-11-12 00:59:34,438 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:59:34,467 WARN L672 CHandler]: The function __VERIFIER_nondet_charp is called, but not defined or handled by StandardFunctionHandler. [2023-11-12 00:59:34,476 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:59:34,477 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34 WrapperNode [2023-11-12 00:59:34,477 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:59:34,478 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:59:34,479 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:59:34,479 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:59:34,487 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,504 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,536 INFO L138 Inliner]: procedures = 130, calls = 86, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 161 [2023-11-12 00:59:34,536 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:59:34,537 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:59:34,537 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:59:34,537 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:59:34,547 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,548 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,553 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,554 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,568 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,572 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,575 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,578 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,582 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:59:34,583 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:59:34,584 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:59:34,584 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:59:34,585 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (1/1) ... [2023-11-12 00:59:34,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:59:34,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:59:34,638 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:59:34,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:59:34,692 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:59:34,694 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:59:34,694 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-12 00:59:34,695 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:59:34,695 INFO L130 BoogieDeclarations]: Found specification of procedure append_to_queue [2023-11-12 00:59:34,696 INFO L138 BoogieDeclarations]: Found implementation of procedure append_to_queue [2023-11-12 00:59:34,696 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-12 00:59:34,696 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:59:34,696 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-12 00:59:34,697 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_charp [2023-11-12 00:59:34,697 INFO L130 BoogieDeclarations]: Found specification of procedure send [2023-11-12 00:59:34,697 INFO L138 BoogieDeclarations]: Found implementation of procedure send [2023-11-12 00:59:34,697 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:59:34,698 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-12 00:59:34,698 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:59:34,699 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:59:34,699 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:59:34,872 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:59:34,874 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:59:35,379 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:59:35,488 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:59:35,494 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-12 00:59:35,498 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:59:35 BoogieIcfgContainer [2023-11-12 00:59:35,502 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:59:35,506 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:59:35,507 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:59:35,511 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:59:35,512 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:59:33" (1/3) ... [2023-11-12 00:59:35,513 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c06d688 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:59:35, skipping insertion in model container [2023-11-12 00:59:35,513 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:59:34" (2/3) ... [2023-11-12 00:59:35,515 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c06d688 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:59:35, skipping insertion in model container [2023-11-12 00:59:35,516 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:59:35" (3/3) ... [2023-11-12 00:59:35,518 INFO L112 eAbstractionObserver]: Analyzing ICFG packet_filter.i [2023-11-12 00:59:35,542 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:59:35,543 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-12 00:59:35,620 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:59:35,628 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;@56872fcf, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:59:35,629 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-12 00:59:35,634 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 25 states have internal predecessors, (34), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 00:59:35,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 00:59:35,644 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:59:35,645 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 00:59:35,645 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:59:35,651 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:59:35,652 INFO L85 PathProgramCache]: Analyzing trace with hash 440449608, now seen corresponding path program 1 times [2023-11-12 00:59:35,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:59:35,664 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611257822] [2023-11-12 00:59:35,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:59:35,665 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:59:35,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:59:35,875 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:59:35,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:59:35,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611257822] [2023-11-12 00:59:35,877 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611257822] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:59:35,877 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:59:35,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:59:35,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152832435] [2023-11-12 00:59:35,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:59:35,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-12 00:59:35,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:59:35,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-12 00:59:35,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-12 00:59:35,947 INFO L87 Difference]: Start difference. First operand has 33 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 25 states have internal predecessors, (34), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:59:36,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:59:36,035 INFO L93 Difference]: Finished difference Result 51 states and 66 transitions. [2023-11-12 00:59:36,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-12 00:59:36,039 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 00:59:36,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:59:36,048 INFO L225 Difference]: With dead ends: 51 [2023-11-12 00:59:36,049 INFO L226 Difference]: Without dead ends: 32 [2023-11-12 00:59:36,053 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-12 00:59:36,057 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:59:36,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:59:36,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-12 00:59:36,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-11-12 00:59:36,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 00:59:36,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2023-11-12 00:59:36,115 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 6 [2023-11-12 00:59:36,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:59:36,116 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2023-11-12 00:59:36,117 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:59:36,117 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2023-11-12 00:59:36,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:59:36,120 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:59:36,121 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:59:36,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:59:36,122 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:59:36,123 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:59:36,123 INFO L85 PathProgramCache]: Analyzing trace with hash -208091511, now seen corresponding path program 1 times [2023-11-12 00:59:36,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:59:36,124 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846607125] [2023-11-12 00:59:36,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:59:36,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:59:36,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:59:36,396 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:59:36,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:59:36,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846607125] [2023-11-12 00:59:36,397 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846607125] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:59:36,398 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:59:36,398 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:59:36,398 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663527358] [2023-11-12 00:59:36,398 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:59:36,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:59:36,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:59:36,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:59:36,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:59:36,402 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:59:36,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:59:36,622 INFO L93 Difference]: Finished difference Result 58 states and 71 transitions. [2023-11-12 00:59:36,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:59:36,623 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 00:59:36,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:59:36,626 INFO L225 Difference]: With dead ends: 58 [2023-11-12 00:59:36,627 INFO L226 Difference]: Without dead ends: 42 [2023-11-12 00:59:36,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:59:36,632 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 7 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:59:36,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 80 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:59:36,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-11-12 00:59:36,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2023-11-12 00:59:36,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 28 states have internal predecessors, (35), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 00:59:36,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2023-11-12 00:59:36,657 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 7 [2023-11-12 00:59:36,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:59:36,658 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2023-11-12 00:59:36,658 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:59:36,658 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2023-11-12 00:59:36,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:59:36,663 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:59:36,664 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:59:36,665 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:59:36,667 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:59:36,667 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:59:36,668 INFO L85 PathProgramCache]: Analyzing trace with hash 2139112292, now seen corresponding path program 1 times [2023-11-12 00:59:36,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:59:36,670 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808441805] [2023-11-12 00:59:36,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:59:36,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:59:36,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:59:36,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:59:36,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:59:36,892 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808441805] [2023-11-12 00:59:36,892 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808441805] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:59:36,892 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:59:36,892 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:59:36,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575183604] [2023-11-12 00:59:36,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:59:36,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:59:36,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:59:36,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:59:36,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:59:36,895 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:59:37,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:59:37,088 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2023-11-12 00:59:37,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:59:37,089 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-12 00:59:37,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:59:37,090 INFO L225 Difference]: With dead ends: 46 [2023-11-12 00:59:37,090 INFO L226 Difference]: Without dead ends: 34 [2023-11-12 00:59:37,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:59:37,092 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 1 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:59:37,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 84 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:59:37,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-12 00:59:37,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-11-12 00:59:37,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 00:59:37,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2023-11-12 00:59:37,101 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 8 [2023-11-12 00:59:37,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:59:37,101 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2023-11-12 00:59:37,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:59:37,102 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2023-11-12 00:59:37,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:59:37,103 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:59:37,103 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:59:37,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:59:37,103 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:59:37,104 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:59:37,104 INFO L85 PathProgramCache]: Analyzing trace with hash 1183533921, now seen corresponding path program 1 times [2023-11-12 00:59:37,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:59:37,105 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118671234] [2023-11-12 00:59:37,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:59:37,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:59:37,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:59:37,784 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:59:37,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:59:37,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118671234] [2023-11-12 00:59:37,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [118671234] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:59:37,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802870785] [2023-11-12 00:59:37,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:59:37,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:59:37,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:59:37,791 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:59:37,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:59:37,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:59:37,935 INFO L262 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 36 conjunts are in the unsatisfiable core [2023-11-12 00:59:37,945 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:59:38,038 INFO L322 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-12 00:59:38,039 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2023-11-12 00:59:38,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:59:38,130 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-12 00:59:38,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:59:38,145 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-12 00:59:38,158 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-12 00:59:38,159 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2023-11-12 00:59:38,235 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:59:38,235 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:59:38,439 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:59:38,440 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802870785] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:59:38,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1174378306] [2023-11-12 00:59:38,460 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:59:38,460 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:59:38,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:59:38,469 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:59:38,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:59:39,451 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:59:45,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1174378306] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:59:45,695 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:59:45,695 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [4, 4, 4] total 10 [2023-11-12 00:59:45,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293700470] [2023-11-12 00:59:45,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:59:45,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:59:45,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:59:45,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:59:45,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=69, Unknown=2, NotChecked=0, Total=110 [2023-11-12 00:59:45,698 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) [2023-11-12 00:59:47,235 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 00:59:49,341 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 00:59:51,449 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 00:59:52,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:59:52,721 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2023-11-12 00:59:52,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:59:52,722 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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 11 [2023-11-12 00:59:52,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:59:52,723 INFO L225 Difference]: With dead ends: 62 [2023-11-12 00:59:52,723 INFO L226 Difference]: Without dead ends: 46 [2023-11-12 00:59:52,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=39, Invalid=69, Unknown=2, NotChecked=0, Total=110 [2023-11-12 00:59:52,725 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 6 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 0 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:59:52,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 103 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 109 Invalid, 3 Unknown, 0 Unchecked, 7.0s Time] [2023-11-12 00:59:52,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-12 00:59:52,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2023-11-12 00:59:52,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 32 states have internal predecessors, (40), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 00:59:52,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2023-11-12 00:59:52,736 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 11 [2023-11-12 00:59:52,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:59:52,736 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2023-11-12 00:59:52,737 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) [2023-11-12 00:59:52,737 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2023-11-12 00:59:52,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-12 00:59:52,738 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:59:52,738 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:59:52,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:59:52,944 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:59:52,945 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:59:52,945 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:59:52,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1965139572, now seen corresponding path program 1 times [2023-11-12 00:59:52,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:59:52,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667993364] [2023-11-12 00:59:52,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:59:52,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:59:52,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:59:53,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:59:53,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:59:53,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667993364] [2023-11-12 00:59:53,273 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [667993364] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:59:53,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727384476] [2023-11-12 00:59:53,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:59:53,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:59:53,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:59:53,275 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:59:53,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:59:53,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:59:53,419 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 34 conjunts are in the unsatisfiable core [2023-11-12 00:59:53,424 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:59:53,441 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-12 00:59:53,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:59:53,451 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-12 00:59:53,499 INFO L322 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2023-11-12 00:59:53,500 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 34 [2023-11-12 00:59:53,510 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-12 00:59:53,519 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-12 00:59:53,584 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:59:53,585 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:59:53,789 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:59:53,789 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1727384476] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:59:53,790 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [712707651] [2023-11-12 00:59:53,794 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:59:53,794 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:59:53,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:59:53,795 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:59:53,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:59:55,451 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:00:01,575 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [712707651] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:00:01,576 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:00:01,576 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 4, 4] total 12 [2023-11-12 01:00:01,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737822635] [2023-11-12 01:00:01,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:00:01,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 01:00:01,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:00:01,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 01:00:01,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=104, Unknown=2, NotChecked=0, Total=156 [2023-11-12 01:00:01,578 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:00:03,722 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 01:00:05,872 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 01:00:07,996 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 01:00:09,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:00:09,696 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2023-11-12 01:00:09,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 01:00:09,697 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 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 12 [2023-11-12 01:00:09,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:00:09,698 INFO L225 Difference]: With dead ends: 50 [2023-11-12 01:00:09,698 INFO L226 Difference]: Without dead ends: 38 [2023-11-12 01:00:09,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=50, Invalid=104, Unknown=2, NotChecked=0, Total=156 [2023-11-12 01:00:09,700 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 0 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 0 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:00:09,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 148 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 131 Invalid, 3 Unknown, 0 Unchecked, 8.1s Time] [2023-11-12 01:00:09,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-12 01:00:09,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2023-11-12 01:00:09,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 28 states have internal predecessors, (35), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 01:00:09,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2023-11-12 01:00:09,708 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 12 [2023-11-12 01:00:09,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:00:09,708 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2023-11-12 01:00:09,708 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:00:09,709 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2023-11-12 01:00:09,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-12 01:00:09,709 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:00:09,710 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:00:09,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 01:00:09,916 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:09,916 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:00:09,917 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:00:09,917 INFO L85 PathProgramCache]: Analyzing trace with hash -2063718111, now seen corresponding path program 1 times [2023-11-12 01:00:09,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:00:09,917 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805305597] [2023-11-12 01:00:09,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:09,917 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:00:10,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:11,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:00:11,502 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:00:11,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805305597] [2023-11-12 01:00:11,502 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805305597] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:00:11,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910094786] [2023-11-12 01:00:11,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:11,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:11,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:00:11,505 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:00:11,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a8f2ba4-70be-4354-a661-483f4597416a/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 01:00:11,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:11,673 INFO L262 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 58 conjunts are in the unsatisfiable core [2023-11-12 01:00:11,677 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:00:11,752 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2023-11-12 01:00:11,825 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 47 [2023-11-12 01:00:11,842 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 01:00:11,854 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 51 [2023-11-12 01:00:11,867 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 01:00:11,933 INFO L322 Elim1Store]: treesize reduction 20, result has 62.3 percent of original size [2023-11-12 01:00:11,933 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 97 treesize of output 103 [2023-11-12 01:00:11,980 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-11-12 01:00:12,003 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-11-12 01:00:12,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 01:00:12,027 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-12 01:00:12,041 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 60 [2023-11-12 01:00:12,050 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2023-11-12 01:00:12,067 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 29 [2023-11-12 01:00:12,095 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 7 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 1 [2023-11-12 01:00:12,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 01:00:12,109 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 57 [2023-11-12 01:00:12,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 01:00:12,147 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 7 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 1 [2023-11-12 01:00:12,196 INFO L322 Elim1Store]: treesize reduction 50, result has 41.2 percent of original size [2023-11-12 01:00:12,197 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 60 treesize of output 104 [2023-11-12 01:00:12,207 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2023-11-12 01:00:12,219 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-12 01:00:12,220 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 1 [2023-11-12 01:00:12,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 01:00:12,257 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 26 [2023-11-12 01:00:12,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 01:00:12,523 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-11-12 01:00:12,528 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 18 [2023-11-12 01:00:12,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:00:12,603 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:00:13,291 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 01:00:13,291 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 116 treesize of output 120 [2023-11-12 01:00:13,313 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2023-11-12 01:00:13,363 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 01:00:13,364 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 6 [2023-11-12 01:00:13,388 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 1 [2023-11-12 01:00:13,395 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 25 [2023-11-12 01:00:13,617 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-12 01:00:13,625 INFO L322 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-12 01:00:13,626 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 1 [2023-11-12 01:00:13,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:00:13,742 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910094786] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:00:13,742 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [944899037] [2023-11-12 01:00:13,746 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 01:00:13,746 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:00:13,747 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:00:13,747 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:00:13,747 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:00:21,011 INFO L197 IcfgInterpreter]: Interpreting procedure append_to_queue with input of size 148 for LOIs [2023-11-12 01:00:21,089 INFO L180 IcfgInterpreter]: Interpretation finished