./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/verifythis/prefixsum_iter.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9bd2c7ff 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_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/verifythis/prefixsum_iter.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 4cd641fa41c29ed0240eed782d3555502472fe8bb63d504547076d8eeefa2c0d --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:21:52,338 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:21:52,457 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-19 05:21:52,463 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:21:52,464 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:21:52,502 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:21:52,503 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:21:52,503 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:21:52,504 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:21:52,509 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:21:52,510 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:21:52,510 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:21:52,511 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:21:52,511 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:21:52,512 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:21:52,512 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:21:52,512 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:21:52,513 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:21:52,513 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:21:52,513 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:21:52,514 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:21:52,520 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:21:52,521 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 05:21:52,521 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 05:21:52,522 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:21:52,523 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:21:52,523 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:21:52,524 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:21:52,524 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:21:52,524 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 05:21:52,526 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 05:21:52,526 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 05:21:52,526 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:21:52,526 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 05:21:52,527 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 05:21:52,527 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:21:52,527 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:21:52,527 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:21:52,528 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:21:52,528 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:21:52,528 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:21:52,529 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:21:52,529 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:21:52,529 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:21:52,530 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:21:52,530 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:21:52,530 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_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4cd641fa41c29ed0240eed782d3555502472fe8bb63d504547076d8eeefa2c0d [2023-11-19 05:21:52,812 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:21:52,841 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:21:52,843 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:21:52,844 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:21:52,846 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:21:52,848 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/verifythis/prefixsum_iter.c [2023-11-19 05:21:55,843 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:21:56,135 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:21:56,136 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/sv-benchmarks/c/verifythis/prefixsum_iter.c [2023-11-19 05:21:56,144 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/data/57ed8a845/8c3db096046b429d87a4a42ddee18fbf/FLAGb511f62c0 [2023-11-19 05:21:56,162 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/data/57ed8a845/8c3db096046b429d87a4a42ddee18fbf [2023-11-19 05:21:56,168 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:21:56,169 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:21:56,172 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:21:56,173 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:21:56,178 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:21:56,178 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,179 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4707cab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56, skipping insertion in model container [2023-11-19 05:21:56,180 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,210 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:21:56,412 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:21:56,423 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:21:56,450 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:21:56,466 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:21:56,467 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56 WrapperNode [2023-11-19 05:21:56,467 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:21:56,468 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:21:56,469 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:21:56,469 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:21:56,476 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,486 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,520 INFO L138 Inliner]: procedures = 22, calls = 34, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 136 [2023-11-19 05:21:56,520 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:21:56,520 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:21:56,521 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:21:56,521 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:21:56,528 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,528 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,532 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,532 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,541 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,546 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,548 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,549 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,553 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:21:56,554 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:21:56,554 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:21:56,554 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:21:56,555 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (1/1) ... [2023-11-19 05:21:56,561 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:21:56,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:56,589 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:21:56,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:21:56,635 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:21:56,635 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-19 05:21:56,636 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-19 05:21:56,636 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:21:56,636 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:21:56,636 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:21:56,636 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:21:56,636 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:21:56,637 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:21:56,637 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2023-11-19 05:21:56,637 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2023-11-19 05:21:56,637 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:21:56,737 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:21:56,739 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:21:57,131 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:21:57,258 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:21:57,258 INFO L302 CfgBuilder]: Removed 7 assume(true) statements. [2023-11-19 05:21:57,270 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:21:57 BoogieIcfgContainer [2023-11-19 05:21:57,271 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:21:57,277 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:21:57,278 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:21:57,282 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:21:57,283 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:21:56" (1/3) ... [2023-11-19 05:21:57,283 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b807aae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:21:57, skipping insertion in model container [2023-11-19 05:21:57,284 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:21:56" (2/3) ... [2023-11-19 05:21:57,284 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b807aae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:21:57, skipping insertion in model container [2023-11-19 05:21:57,284 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:21:57" (3/3) ... [2023-11-19 05:21:57,286 INFO L112 eAbstractionObserver]: Analyzing ICFG prefixsum_iter.c [2023-11-19 05:21:57,305 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:21:57,305 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 34 error locations. [2023-11-19 05:21:57,360 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:21:57,369 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@5928ef23, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:21:57,369 INFO L358 AbstractCegarLoop]: Starting to check reachability of 34 error locations. [2023-11-19 05:21:57,375 INFO L276 IsEmpty]: Start isEmpty. Operand has 78 states, 37 states have (on average 2.135135135135135) internal successors, (79), 71 states have internal predecessors, (79), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:21:57,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 05:21:57,385 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:57,386 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:57,387 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:21:57,393 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:57,394 INFO L85 PathProgramCache]: Analyzing trace with hash -1266098208, now seen corresponding path program 1 times [2023-11-19 05:21:57,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:57,407 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675968022] [2023-11-19 05:21:57,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:57,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:57,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:58,102 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:21:58,103 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:58,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675968022] [2023-11-19 05:21:58,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675968022] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:58,104 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:21:58,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:21:58,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472838169] [2023-11-19 05:21:58,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:58,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:21:58,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:58,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:21:58,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:21:58,157 INFO L87 Difference]: Start difference. First operand has 78 states, 37 states have (on average 2.135135135135135) internal successors, (79), 71 states have internal predecessors, (79), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:21:58,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:58,321 INFO L93 Difference]: Finished difference Result 76 states and 84 transitions. [2023-11-19 05:21:58,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:21:58,324 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 20 [2023-11-19 05:21:58,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:58,334 INFO L225 Difference]: With dead ends: 76 [2023-11-19 05:21:58,334 INFO L226 Difference]: Without dead ends: 75 [2023-11-19 05:21:58,337 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 [2023-11-19 05:21:58,341 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 116 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:58,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 63 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:21:58,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-11-19 05:21:58,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2023-11-19 05:21:58,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 37 states have (on average 2.027027027027027) internal successors, (75), 68 states have internal predecessors, (75), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:21:58,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 83 transitions. [2023-11-19 05:21:58,393 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 83 transitions. Word has length 20 [2023-11-19 05:21:58,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:58,394 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 83 transitions. [2023-11-19 05:21:58,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:21:58,395 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 83 transitions. [2023-11-19 05:21:58,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 05:21:58,397 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:58,397 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:58,397 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:21:58,397 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:21:58,398 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:58,398 INFO L85 PathProgramCache]: Analyzing trace with hash -1266098207, now seen corresponding path program 1 times [2023-11-19 05:21:58,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:58,399 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902681552] [2023-11-19 05:21:58,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:58,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:58,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:59,018 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:21:59,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:59,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902681552] [2023-11-19 05:21:59,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902681552] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:59,019 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:21:59,020 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-19 05:21:59,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290628190] [2023-11-19 05:21:59,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:59,021 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 05:21:59,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:59,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 05:21:59,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-11-19 05:21:59,023 INFO L87 Difference]: Start difference. First operand 75 states and 83 transitions. Second operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 9 states have internal predecessors, (10), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:21:59,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:21:59,967 INFO L93 Difference]: Finished difference Result 201 states and 223 transitions. [2023-11-19 05:21:59,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 05:21:59,970 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 9 states have internal predecessors, (10), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 20 [2023-11-19 05:21:59,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:21:59,973 INFO L225 Difference]: With dead ends: 201 [2023-11-19 05:21:59,974 INFO L226 Difference]: Without dead ends: 201 [2023-11-19 05:21:59,975 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:21:59,980 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 580 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 583 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:21:59,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [583 Valid, 193 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 05:21:59,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-11-19 05:22:00,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 106. [2023-11-19 05:22:00,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 65 states have (on average 2.1076923076923078) internal successors, (137), 96 states have internal predecessors, (137), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-19 05:22:00,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 151 transitions. [2023-11-19 05:22:00,022 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 151 transitions. Word has length 20 [2023-11-19 05:22:00,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:00,023 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 151 transitions. [2023-11-19 05:22:00,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 9 states have internal predecessors, (10), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:22:00,023 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 151 transitions. [2023-11-19 05:22:00,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:22:00,025 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:00,025 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:00,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:22:00,026 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:22:00,027 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:00,027 INFO L85 PathProgramCache]: Analyzing trace with hash -594338777, now seen corresponding path program 1 times [2023-11-19 05:22:00,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:00,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468394327] [2023-11-19 05:22:00,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:00,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:00,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:00,141 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:22:00,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:00,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468394327] [2023-11-19 05:22:00,142 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468394327] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:00,147 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:22:00,147 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:22:00,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205234307] [2023-11-19 05:22:00,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:00,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:22:00,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:00,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:22:00,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:22:00,152 INFO L87 Difference]: Start difference. First operand 106 states and 151 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:22:00,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:00,258 INFO L93 Difference]: Finished difference Result 105 states and 149 transitions. [2023-11-19 05:22:00,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:22:00,263 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 21 [2023-11-19 05:22:00,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:00,268 INFO L225 Difference]: With dead ends: 105 [2023-11-19 05:22:00,269 INFO L226 Difference]: Without dead ends: 105 [2023-11-19 05:22:00,272 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 [2023-11-19 05:22:00,277 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 113 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:00,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 67 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:22:00,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-11-19 05:22:00,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2023-11-19 05:22:00,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 65 states have (on average 2.076923076923077) internal successors, (135), 95 states have internal predecessors, (135), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-19 05:22:00,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 149 transitions. [2023-11-19 05:22:00,295 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 149 transitions. Word has length 21 [2023-11-19 05:22:00,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:00,296 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 149 transitions. [2023-11-19 05:22:00,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:22:00,297 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 149 transitions. [2023-11-19 05:22:00,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:22:00,298 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:00,298 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:00,298 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:22:00,299 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:22:00,299 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:00,300 INFO L85 PathProgramCache]: Analyzing trace with hash -594338776, now seen corresponding path program 1 times [2023-11-19 05:22:00,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:00,300 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483757556] [2023-11-19 05:22:00,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:00,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:00,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:00,723 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:22:00,723 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:00,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483757556] [2023-11-19 05:22:00,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [483757556] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:00,724 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:22:00,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:22:00,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262447848] [2023-11-19 05:22:00,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:00,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:22:00,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:00,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:22:00,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:22:00,730 INFO L87 Difference]: Start difference. First operand 105 states and 149 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:22:01,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:01,138 INFO L93 Difference]: Finished difference Result 181 states and 258 transitions. [2023-11-19 05:22:01,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:22:01,139 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 21 [2023-11-19 05:22:01,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:01,141 INFO L225 Difference]: With dead ends: 181 [2023-11-19 05:22:01,141 INFO L226 Difference]: Without dead ends: 181 [2023-11-19 05:22:01,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-11-19 05:22:01,142 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 299 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:01,142 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [299 Valid, 66 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:22:01,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2023-11-19 05:22:01,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 107. [2023-11-19 05:22:01,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 68 states have (on average 2.014705882352941) internal successors, (137), 97 states have internal predecessors, (137), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-19 05:22:01,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 151 transitions. [2023-11-19 05:22:01,162 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 151 transitions. Word has length 21 [2023-11-19 05:22:01,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:01,163 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 151 transitions. [2023-11-19 05:22:01,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:22:01,163 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 151 transitions. [2023-11-19 05:22:01,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:22:01,164 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:01,164 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:01,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 05:22:01,167 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:22:01,167 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:01,167 INFO L85 PathProgramCache]: Analyzing trace with hash -594155024, now seen corresponding path program 1 times [2023-11-19 05:22:01,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:01,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125727214] [2023-11-19 05:22:01,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:01,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:01,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:01,274 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:22:01,275 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:01,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125727214] [2023-11-19 05:22:01,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [125727214] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:01,275 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:22:01,275 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:22:01,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241697881] [2023-11-19 05:22:01,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:01,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:22:01,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:01,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:22:01,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:22:01,277 INFO L87 Difference]: Start difference. First operand 107 states and 151 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:22:01,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:01,374 INFO L93 Difference]: Finished difference Result 101 states and 139 transitions. [2023-11-19 05:22:01,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:22:01,375 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 21 [2023-11-19 05:22:01,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:01,376 INFO L225 Difference]: With dead ends: 101 [2023-11-19 05:22:01,376 INFO L226 Difference]: Without dead ends: 101 [2023-11-19 05:22:01,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:22:01,377 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 115 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:01,378 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 82 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:22:01,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-11-19 05:22:01,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2023-11-19 05:22:01,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 68 states have (on average 1.838235294117647) internal successors, (125), 91 states have internal predecessors, (125), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-19 05:22:01,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 139 transitions. [2023-11-19 05:22:01,386 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 139 transitions. Word has length 21 [2023-11-19 05:22:01,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:01,386 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 139 transitions. [2023-11-19 05:22:01,387 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:22:01,387 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 139 transitions. [2023-11-19 05:22:01,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:22:01,388 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:01,388 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:01,388 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 05:22:01,389 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:22:01,389 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:01,389 INFO L85 PathProgramCache]: Analyzing trace with hash -594155023, now seen corresponding path program 1 times [2023-11-19 05:22:01,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:01,390 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448034701] [2023-11-19 05:22:01,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:01,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:01,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:01,583 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:22:01,583 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:01,583 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448034701] [2023-11-19 05:22:01,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448034701] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:01,584 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:22:01,584 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-19 05:22:01,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668832030] [2023-11-19 05:22:01,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:01,584 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:22:01,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:01,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:22:01,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:22:01,586 INFO L87 Difference]: Start difference. First operand 101 states and 139 transitions. Second operand has 8 states, 6 states have (on average 2.0) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:22:01,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:01,773 INFO L93 Difference]: Finished difference Result 155 states and 197 transitions. [2023-11-19 05:22:01,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:22:01,774 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 21 [2023-11-19 05:22:01,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:01,775 INFO L225 Difference]: With dead ends: 155 [2023-11-19 05:22:01,775 INFO L226 Difference]: Without dead ends: 155 [2023-11-19 05:22:01,776 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2023-11-19 05:22:01,777 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 129 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:01,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 403 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:22:01,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2023-11-19 05:22:01,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 101. [2023-11-19 05:22:01,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 68 states have (on average 1.8235294117647058) internal successors, (124), 91 states have internal predecessors, (124), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-19 05:22:01,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 138 transitions. [2023-11-19 05:22:01,785 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 138 transitions. Word has length 21 [2023-11-19 05:22:01,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:01,785 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 138 transitions. [2023-11-19 05:22:01,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:22:01,786 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 138 transitions. [2023-11-19 05:22:01,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:22:01,787 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:01,787 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:01,787 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-19 05:22:01,788 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:22:01,788 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:01,788 INFO L85 PathProgramCache]: Analyzing trace with hash -122104240, now seen corresponding path program 1 times [2023-11-19 05:22:01,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:01,788 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270552770] [2023-11-19 05:22:01,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:01,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:01,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:02,537 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:22:02,537 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:02,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270552770] [2023-11-19 05:22:02,537 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270552770] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:22:02,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108177865] [2023-11-19 05:22:02,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:02,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:02,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:02,542 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:02,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:22:02,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:02,629 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-19 05:22:02,648 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:02,778 INFO L378 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 8 treesize of output 1 [2023-11-19 05:22:02,782 INFO L378 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 [2023-11-19 05:22:02,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:22:02,987 INFO L378 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-19 05:22:03,010 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-19 05:22:03,010 INFO L378 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 11 treesize of output 11 [2023-11-19 05:22:03,242 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:22:03,242 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:22:03,495 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108177865] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:22:03,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1838107107] [2023-11-19 05:22:03,516 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-19 05:22:03,516 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:22:03,521 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:22:03,527 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:22:03,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:22:04,429 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 73 for LOIs [2023-11-19 05:22:04,466 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 73 for LOIs [2023-11-19 05:22:04,512 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:22:07,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1838107107] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:07,018 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:22:07,018 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [9, 9] total 32 [2023-11-19 05:22:07,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418993333] [2023-11-19 05:22:07,019 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:07,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 05:22:07,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:07,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 05:22:07,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1115, Unknown=6, NotChecked=0, Total=1332 [2023-11-19 05:22:07,021 INFO L87 Difference]: Start difference. First operand 101 states and 138 transitions. Second operand has 17 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:22:10,184 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] [2023-11-19 05:22:12,722 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-19 05:22:14,818 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-19 05:22:17,073 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-19 05:22:19,113 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-19 05:22:21,284 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-19 05:22:24,199 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-19 05:22:26,216 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] [2023-11-19 05:22:26,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:26,883 INFO L93 Difference]: Finished difference Result 114 states and 152 transitions. [2023-11-19 05:22:26,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-19 05:22:26,883 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2023-11-19 05:22:26,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:26,885 INFO L225 Difference]: With dead ends: 114 [2023-11-19 05:22:26,885 INFO L226 Difference]: Without dead ends: 114 [2023-11-19 05:22:26,886 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=243, Invalid=1311, Unknown=6, NotChecked=0, Total=1560 [2023-11-19 05:22:26,887 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 19 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 741 mSolverCounterSat, 1 mSolverCounterUnsat, 30 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 741 IncrementalHoareTripleChecker+Invalid, 30 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:26,887 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 241 Invalid, 772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 741 Invalid, 30 Unknown, 0 Unchecked, 19.6s Time] [2023-11-19 05:22:26,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2023-11-19 05:22:26,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 100. [2023-11-19 05:22:26,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 67 states have (on average 1.8208955223880596) internal successors, (122), 90 states have internal predecessors, (122), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-19 05:22:26,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 136 transitions. [2023-11-19 05:22:26,894 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 136 transitions. Word has length 21 [2023-11-19 05:22:26,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:26,895 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 136 transitions. [2023-11-19 05:22:26,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:22:26,895 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 136 transitions. [2023-11-19 05:22:26,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 05:22:26,896 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:26,896 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:26,922 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:22:27,112 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:27,112 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:22:27,113 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:27,113 INFO L85 PathProgramCache]: Analyzing trace with hash 509919586, now seen corresponding path program 1 times [2023-11-19 05:22:27,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:27,113 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74697505] [2023-11-19 05:22:27,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:27,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:27,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:27,461 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:22:27,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:27,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74697505] [2023-11-19 05:22:27,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74697505] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:22:27,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160743872] [2023-11-19 05:22:27,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:27,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:27,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:27,464 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:27,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:22:27,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:27,566 INFO L262 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-19 05:22:27,571 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:27,762 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:22:27,762 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:22:27,929 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:22:27,929 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160743872] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:22:27,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [87175026] [2023-11-19 05:22:27,935 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-19 05:22:27,935 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:22:27,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:22:27,936 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:22:27,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:22:28,596 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 73 for LOIs [2023-11-19 05:22:28,622 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 73 for LOIs [2023-11-19 05:22:28,660 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:22:37,328 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2051#(and (or (and (exists ((|v_#memory_int_81| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_81| |ULTIMATE.start_main_#t~malloc16#1.base| ((as const (Array Int Int)) 0)))) (<= (+ |ULTIMATE.start_main_#t~malloc16#1.base| 1) |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_is_pow2_~x#1_25| Int)) (= (mod |v_ULTIMATE.start_is_pow2_~x#1_25| 4294967296) 1)) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_main_#t~malloc15#1.base|) (exists ((|v_#length_59| (Array Int Int))) (= |#length| (store (store |v_#length_59| |ULTIMATE.start_main_#t~malloc15#1.base| 0) |ULTIMATE.start_main_#t~malloc16#1.base| 0))) (exists ((|v_#valid_69| (Array Int Int))) (and (= |#valid| (store (store |v_#valid_69| |ULTIMATE.start_main_#t~malloc15#1.base| 1) |ULTIMATE.start_main_#t~malloc16#1.base| 1)) (= (select |v_#valid_69| |ULTIMATE.start_main_#t~malloc15#1.base|) 0) (= 0 (select (store |v_#valid_69| |ULTIMATE.start_main_#t~malloc15#1.base| 1) |ULTIMATE.start_main_#t~malloc16#1.base|)))) (not (= |ULTIMATE.start_main_#t~malloc16#1.base| 0)) (<= (+ |ULTIMATE.start_main_#t~malloc15#1.base| 1) |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_#t~malloc15#1.base| 0))) (and (<= (+ |ULTIMATE.start_main_#t~malloc16#1.base| 1) |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_is_pow2_~x#1_25| Int)) (= (mod |v_ULTIMATE.start_is_pow2_~x#1_25| 4294967296) 1)) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_main_#t~malloc15#1.base|) (exists ((|v_#length_59| (Array Int Int))) (= |#length| (store (store |v_#length_59| |ULTIMATE.start_main_#t~malloc15#1.base| 0) |ULTIMATE.start_main_#t~malloc16#1.base| 0))) (exists ((|v_#memory_int_82| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_82| |ULTIMATE.start_main_#t~malloc16#1.base| ((as const (Array Int Int)) 0)))) (exists ((|v_#valid_69| (Array Int Int))) (and (= |#valid| (store (store |v_#valid_69| |ULTIMATE.start_main_#t~malloc15#1.base| 1) |ULTIMATE.start_main_#t~malloc16#1.base| 1)) (= (select |v_#valid_69| |ULTIMATE.start_main_#t~malloc15#1.base|) 0) (= 0 (select (store |v_#valid_69| |ULTIMATE.start_main_#t~malloc15#1.base| 1) |ULTIMATE.start_main_#t~malloc16#1.base|)))) (not (= |ULTIMATE.start_main_#t~malloc16#1.base| 0)) (<= (+ |ULTIMATE.start_main_#t~malloc15#1.base| 1) |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_#t~malloc15#1.base| 0)))) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_downsweep_#in~n#1| 0) (= |ULTIMATE.start_downsweep_~n#1| 0) (= |ULTIMATE.start_main_~a0~0#1.offset| 0) (= |ULTIMATE.start_main_~space~1#1| 1) (= |ULTIMATE.start_upsweep_#res#1| 1) (= |ULTIMATE.start_main_#t~malloc16#1.offset| 0) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_~a0~0#1.base| |ULTIMATE.start_main_#t~malloc16#1.base|) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_downsweep_#in~a#1.base|) (= |ULTIMATE.start_is_pow2_#res#1| 1) (= |ULTIMATE.start_main_~n~0#1| 0) (= |ULTIMATE.start_main_#t~malloc15#1.offset| 0) (= |ULTIMATE.start_downsweep_#in~a#1.base| |ULTIMATE.start_downsweep_~a#1.base|) (= |ULTIMATE.start_downsweep_#in~space#1| 1) (= |ULTIMATE.start_downsweep_~a#1.offset| 0) (= |ULTIMATE.start_downsweep_#in~a#1.offset| 0) (= 1 |ULTIMATE.start_downsweep_~space#1|))' at error location [2023-11-19 05:22:37,328 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:22:37,328 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:22:37,329 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 17 [2023-11-19 05:22:37,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27319020] [2023-11-19 05:22:37,329 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:22:37,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 05:22:37,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:37,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 05:22:37,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=898, Unknown=7, NotChecked=0, Total=1056 [2023-11-19 05:22:37,331 INFO L87 Difference]: Start difference. First operand 100 states and 136 transitions. Second operand has 17 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 6 states have call successors, (11), 1 states have call predecessors, (11), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2023-11-19 05:22:37,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:37,710 INFO L93 Difference]: Finished difference Result 134 states and 151 transitions. [2023-11-19 05:22:37,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:22:37,711 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 6 states have call successors, (11), 1 states have call predecessors, (11), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) Word has length 22 [2023-11-19 05:22:37,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:37,712 INFO L225 Difference]: With dead ends: 134 [2023-11-19 05:22:37,712 INFO L226 Difference]: Without dead ends: 134 [2023-11-19 05:22:37,713 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=172, Invalid=1011, Unknown=7, NotChecked=0, Total=1190 [2023-11-19 05:22:37,714 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 315 mSDsluCounter, 611 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 705 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:37,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [318 Valid, 705 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 410 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:22:37,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2023-11-19 05:22:37,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 81. [2023-11-19 05:22:37,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 71 states have internal predecessors, (79), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-19 05:22:37,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 93 transitions. [2023-11-19 05:22:37,724 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 93 transitions. Word has length 22 [2023-11-19 05:22:37,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:37,725 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 93 transitions. [2023-11-19 05:22:37,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 6 states have call successors, (11), 1 states have call predecessors, (11), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2023-11-19 05:22:37,725 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 93 transitions. [2023-11-19 05:22:37,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 05:22:37,726 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:37,726 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:37,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:22:37,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:37,927 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:22:37,927 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:37,928 INFO L85 PathProgramCache]: Analyzing trace with hash 71253944, now seen corresponding path program 1 times [2023-11-19 05:22:37,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:37,928 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251429454] [2023-11-19 05:22:37,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:37,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:37,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:38,127 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:22:38,127 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:38,127 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251429454] [2023-11-19 05:22:38,127 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251429454] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:22:38,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269623541] [2023-11-19 05:22:38,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:38,128 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:38,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:38,129 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:38,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:22:38,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:38,216 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-19 05:22:38,218 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:38,392 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 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 14 treesize of output 3 [2023-11-19 05:22:38,497 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:22:38,497 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:22:38,728 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:22:38,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269623541] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 05:22:38,728 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:22:38,728 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [9, 9] total 19 [2023-11-19 05:22:38,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792482985] [2023-11-19 05:22:38,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:38,729 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-19 05:22:38,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:38,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-19 05:22:38,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=253, Unknown=0, NotChecked=0, Total=342 [2023-11-19 05:22:38,730 INFO L87 Difference]: Start difference. First operand 81 states and 93 transitions. Second operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:22:38,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:38,994 INFO L93 Difference]: Finished difference Result 130 states and 146 transitions. [2023-11-19 05:22:38,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:22:38,995 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 23 [2023-11-19 05:22:38,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:38,996 INFO L225 Difference]: With dead ends: 130 [2023-11-19 05:22:38,997 INFO L226 Difference]: Without dead ends: 130 [2023-11-19 05:22:38,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=145, Invalid=407, Unknown=0, NotChecked=0, Total=552 [2023-11-19 05:22:38,998 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 444 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 448 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:38,998 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [448 Valid, 255 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:22:38,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2023-11-19 05:22:39,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 82. [2023-11-19 05:22:39,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 72 states have internal predecessors, (80), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-19 05:22:39,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 94 transitions. [2023-11-19 05:22:39,004 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 94 transitions. Word has length 23 [2023-11-19 05:22:39,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:39,005 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 94 transitions. [2023-11-19 05:22:39,005 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:22:39,005 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 94 transitions. [2023-11-19 05:22:39,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-19 05:22:39,006 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:39,007 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:39,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:22:39,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:39,231 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:22:39,231 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:39,231 INFO L85 PathProgramCache]: Analyzing trace with hash -2085911302, now seen corresponding path program 1 times [2023-11-19 05:22:39,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:39,231 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688378252] [2023-11-19 05:22:39,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:39,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:39,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:39,517 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:22:39,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:39,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688378252] [2023-11-19 05:22:39,518 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1688378252] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:22:39,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302119692] [2023-11-19 05:22:39,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:39,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:39,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:39,519 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:39,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:22:39,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:39,617 INFO L262 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-19 05:22:39,620 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:39,849 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:22:39,849 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:22:40,000 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 28 treesize of output 24 [2023-11-19 05:22:40,098 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:22:40,098 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1302119692] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:22:40,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1967953200] [2023-11-19 05:22:40,103 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-19 05:22:40,104 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:22:40,104 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:22:40,105 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:22:40,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:22:41,111 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 68 for LOIs [2023-11-19 05:22:41,143 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2023-11-19 05:22:41,188 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:22:43,440 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2822#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (or (< |ULTIMATE.start_downsweep_~n#1| 1) (< (select |#length| |ULTIMATE.start_downsweep_~a#1.base|) (* |ULTIMATE.start_downsweep_~n#1| 4))) (= |ULTIMATE.start_main_~a0~0#1.offset| 0) (= |ULTIMATE.start_main_~space~1#1| 1) (= |ULTIMATE.start_upsweep_#res#1| 1) (= |ULTIMATE.start_main_#t~malloc16#1.offset| 0) (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_downsweep_#in~a#1.base|) (= |ULTIMATE.start_is_pow2_#res#1| 1) (= |ULTIMATE.start_downsweep_#in~n#1| |ULTIMATE.start_downsweep_~n#1|) (= |ULTIMATE.start_main_#t~malloc15#1.offset| 0) (= |ULTIMATE.start_downsweep_#in~a#1.base| |ULTIMATE.start_downsweep_~a#1.base|) (= |ULTIMATE.start_downsweep_#in~space#1| 1) (<= |ULTIMATE.start_main_~n~0#1| 1) (<= 0 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_downsweep_~a#1.offset| 0) (= |ULTIMATE.start_downsweep_#in~a#1.offset| 0) (= |ULTIMATE.start_downsweep_#in~n#1| |ULTIMATE.start_main_~n~0#1|) (= 1 |ULTIMATE.start_downsweep_~space#1|))' at error location [2023-11-19 05:22:43,441 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:22:43,441 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:22:43,441 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 24 [2023-11-19 05:22:43,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286926488] [2023-11-19 05:22:43,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:22:43,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-19 05:22:43,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:43,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-19 05:22:43,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=1666, Unknown=4, NotChecked=0, Total=1892 [2023-11-19 05:22:43,444 INFO L87 Difference]: Start difference. First operand 82 states and 94 transitions. Second operand has 25 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 25 states have internal predecessors, (32), 5 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-19 05:22:44,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:44,057 INFO L93 Difference]: Finished difference Result 81 states and 93 transitions. [2023-11-19 05:22:44,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-19 05:22:44,058 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 25 states have internal predecessors, (32), 5 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 24 [2023-11-19 05:22:44,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:44,059 INFO L225 Difference]: With dead ends: 81 [2023-11-19 05:22:44,059 INFO L226 Difference]: Without dead ends: 81 [2023-11-19 05:22:44,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 919 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=371, Invalid=2381, Unknown=4, NotChecked=0, Total=2756 [2023-11-19 05:22:44,061 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 417 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 417 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:44,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [417 Valid, 225 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 330 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:22:44,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-19 05:22:44,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-11-19 05:22:44,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 71 states have internal predecessors, (79), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-19 05:22:44,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 93 transitions. [2023-11-19 05:22:44,066 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 93 transitions. Word has length 24 [2023-11-19 05:22:44,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:44,066 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 93 transitions. [2023-11-19 05:22:44,066 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 25 states have internal predecessors, (32), 5 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-19 05:22:44,066 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 93 transitions. [2023-11-19 05:22:44,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-19 05:22:44,067 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:44,067 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:44,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:22:44,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 05:22:44,287 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-19 05:22:44,287 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:44,287 INFO L85 PathProgramCache]: Analyzing trace with hash 230031081, now seen corresponding path program 1 times [2023-11-19 05:22:44,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:44,288 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979933926] [2023-11-19 05:22:44,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:44,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:44,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:44,759 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:22:44,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:44,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979933926] [2023-11-19 05:22:44,759 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979933926] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:22:44,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226030281] [2023-11-19 05:22:44,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:44,760 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:44,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:44,761 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:44,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e438033-6491-45f9-8b8f-e92c6d1acd6d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:22:44,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:44,838 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-19 05:22:44,840 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:44,892 INFO L378 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 [2023-11-19 05:22:44,899 INFO L378 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 8 treesize of output 1 [2023-11-19 05:22:45,049 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-19 05:22:45,049 INFO L378 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 11 treesize of output 11 [2023-11-19 05:22:45,059 INFO L378 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-19 05:22:45,368 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:22:45,369 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:22:45,762 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226030281] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:22:45,762 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [286992974] [2023-11-19 05:22:45,765 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-19 05:22:45,766 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:22:45,766 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:22:45,766 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:22:45,767 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:22:46,454 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 73 for LOIs [2023-11-19 05:22:46,475 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 73 for LOIs [2023-11-19 05:22:46,505 INFO L180 IcfgInterpreter]: Interpretation finished