./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety/960521-1-3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 2329fc70 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_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety/960521-1-3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --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 c10f64ae1701d633846cd3dbd537781b9e2aef0b0b5befdebbc22e76d228933b --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 04:40:19,641 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 04:40:19,643 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 04:40:19,661 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 04:40:19,662 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 04:40:19,663 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 04:40:19,664 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 04:40:19,665 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 04:40:19,667 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 04:40:19,668 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 04:40:19,669 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 04:40:19,670 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 04:40:19,670 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 04:40:19,671 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 04:40:19,672 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 04:40:19,673 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 04:40:19,674 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 04:40:19,675 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 04:40:19,677 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 04:40:19,678 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 04:40:19,680 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 04:40:19,681 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 04:40:19,682 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 04:40:19,683 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 04:40:19,686 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 04:40:19,687 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 04:40:19,687 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 04:40:19,688 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 04:40:19,688 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 04:40:19,689 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 04:40:19,690 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 04:40:19,691 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 04:40:19,691 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 04:40:19,692 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 04:40:19,693 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 04:40:19,693 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 04:40:19,694 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 04:40:19,694 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 04:40:19,695 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 04:40:19,696 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 04:40:19,696 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 04:40:19,697 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-12-14 04:40:19,712 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 04:40:19,712 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 04:40:19,712 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 04:40:19,712 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 04:40:19,713 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 04:40:19,713 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 04:40:19,713 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 04:40:19,713 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 04:40:19,713 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 04:40:19,714 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 04:40:19,714 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 04:40:19,714 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 04:40:19,714 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 04:40:19,714 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 04:40:19,714 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 04:40:19,715 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 04:40:19,715 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 04:40:19,715 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 04:40:19,715 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-12-14 04:40:19,716 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-12-14 04:40:19,716 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 04:40:19,716 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 04:40:19,716 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 04:40:19,716 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 04:40:19,716 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 04:40:19,716 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 04:40:19,717 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-12-14 04:40:19,717 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-12-14 04:40:19,717 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-12-14 04:40:19,717 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 04:40:19,717 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-12-14 04:40:19,718 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 04:40:19,718 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 04:40:19,718 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 04:40:19,718 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 04:40:19,718 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 04:40:19,719 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 04:40:19,719 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 04:40:19,719 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 04:40:19,719 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 04:40:19,719 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 04:40:19,719 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 04:40:19,720 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c10f64ae1701d633846cd3dbd537781b9e2aef0b0b5befdebbc22e76d228933b [2022-12-14 04:40:19,904 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 04:40:19,922 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 04:40:19,924 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 04:40:19,924 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 04:40:19,925 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 04:40:19,926 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/memsafety/960521-1-3.i [2022-12-14 04:40:22,490 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 04:40:22,663 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 04:40:22,664 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/sv-benchmarks/c/memsafety/960521-1-3.i [2022-12-14 04:40:22,672 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/data/0020067bd/0d221d79dbb948f8892cb8e2099a119d/FLAGd629abbf8 [2022-12-14 04:40:23,058 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/data/0020067bd/0d221d79dbb948f8892cb8e2099a119d [2022-12-14 04:40:23,060 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 04:40:23,061 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 04:40:23,062 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 04:40:23,062 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 04:40:23,064 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 04:40:23,065 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,065 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a7a9412 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23, skipping insertion in model container [2022-12-14 04:40:23,066 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,070 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 04:40:23,092 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 04:40:23,265 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 04:40:23,272 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 04:40:23,298 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 04:40:23,315 INFO L208 MainTranslator]: Completed translation [2022-12-14 04:40:23,315 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23 WrapperNode [2022-12-14 04:40:23,315 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 04:40:23,316 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 04:40:23,316 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 04:40:23,316 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 04:40:23,322 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,330 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,343 INFO L138 Inliner]: procedures = 121, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2022-12-14 04:40:23,344 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 04:40:23,344 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 04:40:23,344 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 04:40:23,344 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 04:40:23,351 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,351 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,353 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,353 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,357 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,359 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,360 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,361 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,362 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 04:40:23,363 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 04:40:23,363 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 04:40:23,363 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 04:40:23,364 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (1/1) ... [2022-12-14 04:40:23,368 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 04:40:23,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:40:23,389 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 04:40:23,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 04:40:23,421 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 04:40:23,422 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 04:40:23,422 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-12-14 04:40:23,422 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 04:40:23,422 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 04:40:23,422 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 04:40:23,422 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 04:40:23,422 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 04:40:23,501 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 04:40:23,503 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 04:40:23,633 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 04:40:23,659 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 04:40:23,659 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-12-14 04:40:23,661 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 04:40:23 BoogieIcfgContainer [2022-12-14 04:40:23,662 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 04:40:23,663 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 04:40:23,664 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 04:40:23,666 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 04:40:23,666 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 04:40:23" (1/3) ... [2022-12-14 04:40:23,667 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79ccd3b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 04:40:23, skipping insertion in model container [2022-12-14 04:40:23,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:40:23" (2/3) ... [2022-12-14 04:40:23,667 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79ccd3b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 04:40:23, skipping insertion in model container [2022-12-14 04:40:23,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 04:40:23" (3/3) ... [2022-12-14 04:40:23,668 INFO L112 eAbstractionObserver]: Analyzing ICFG 960521-1-3.i [2022-12-14 04:40:23,683 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 04:40:23,683 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2022-12-14 04:40:23,720 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 04:40:23,725 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;@5eb4ef58, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 04:40:23,725 INFO L358 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2022-12-14 04:40:23,729 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:23,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-12-14 04:40:23,735 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:23,736 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-12-14 04:40:23,736 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:23,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:23,742 INFO L85 PathProgramCache]: Analyzing trace with hash 3507, now seen corresponding path program 1 times [2022-12-14 04:40:23,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:23,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143152222] [2022-12-14 04:40:23,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:23,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:23,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:23,947 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:23,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:23,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143152222] [2022-12-14 04:40:23,948 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [143152222] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:40:23,948 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:40:23,948 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 04:40:23,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493496694] [2022-12-14 04:40:23,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:40:23,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 04:40:23,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:23,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 04:40:23,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 04:40:23,989 INFO L87 Difference]: Start difference. First operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:24,044 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2022-12-14 04:40:24,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 04:40:24,047 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-12-14 04:40:24,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:24,054 INFO L225 Difference]: With dead ends: 43 [2022-12-14 04:40:24,054 INFO L226 Difference]: Without dead ends: 42 [2022-12-14 04:40:24,056 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 04:40:24,059 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 1 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:24,060 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 61 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:40:24,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-12-14 04:40:24,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-12-14 04:40:24,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 22 states have (on average 2.0) internal successors, (44), 41 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2022-12-14 04:40:24,089 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 2 [2022-12-14 04:40:24,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:24,089 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2022-12-14 04:40:24,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,089 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2022-12-14 04:40:24,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-12-14 04:40:24,090 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:24,090 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-12-14 04:40:24,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 04:40:24,090 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:24,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:24,091 INFO L85 PathProgramCache]: Analyzing trace with hash 3508, now seen corresponding path program 1 times [2022-12-14 04:40:24,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:24,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528792702] [2022-12-14 04:40:24,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:24,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:24,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:24,195 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:24,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:24,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528792702] [2022-12-14 04:40:24,196 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528792702] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:40:24,196 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:40:24,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 04:40:24,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194761616] [2022-12-14 04:40:24,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:40:24,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 04:40:24,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:24,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 04:40:24,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 04:40:24,199 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:24,222 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-12-14 04:40:24,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 04:40:24,223 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-12-14 04:40:24,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:24,224 INFO L225 Difference]: With dead ends: 41 [2022-12-14 04:40:24,224 INFO L226 Difference]: Without dead ends: 41 [2022-12-14 04:40:24,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 04:40:24,226 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:24,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:40:24,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-12-14 04:40:24,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-12-14 04:40:24,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 40 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-12-14 04:40:24,231 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 2 [2022-12-14 04:40:24,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:24,232 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-12-14 04:40:24,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,232 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-12-14 04:40:24,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-12-14 04:40:24,232 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:24,233 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-12-14 04:40:24,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 04:40:24,233 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:24,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:24,234 INFO L85 PathProgramCache]: Analyzing trace with hash 3443713, now seen corresponding path program 1 times [2022-12-14 04:40:24,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:24,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224770544] [2022-12-14 04:40:24,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:24,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:24,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:24,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:24,328 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:24,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224770544] [2022-12-14 04:40:24,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224770544] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:40:24,329 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:40:24,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 04:40:24,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43890359] [2022-12-14 04:40:24,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:40:24,330 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 04:40:24,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:24,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 04:40:24,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 04:40:24,331 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:24,365 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2022-12-14 04:40:24,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 04:40:24,365 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-12-14 04:40:24,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:24,366 INFO L225 Difference]: With dead ends: 38 [2022-12-14 04:40:24,366 INFO L226 Difference]: Without dead ends: 38 [2022-12-14 04:40:24,366 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 04:40:24,367 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 42 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:24,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 33 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:40:24,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-12-14 04:40:24,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-12-14 04:40:24,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 37 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2022-12-14 04:40:24,372 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 4 [2022-12-14 04:40:24,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:24,372 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2022-12-14 04:40:24,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,372 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2022-12-14 04:40:24,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-12-14 04:40:24,373 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:24,373 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-12-14 04:40:24,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 04:40:24,373 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:24,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:24,374 INFO L85 PathProgramCache]: Analyzing trace with hash 3443714, now seen corresponding path program 1 times [2022-12-14 04:40:24,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:24,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015185655] [2022-12-14 04:40:24,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:24,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:24,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:24,502 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:24,502 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:24,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015185655] [2022-12-14 04:40:24,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015185655] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:40:24,503 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:40:24,503 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 04:40:24,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720235895] [2022-12-14 04:40:24,503 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:40:24,504 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 04:40:24,504 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:24,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 04:40:24,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 04:40:24,505 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:24,555 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2022-12-14 04:40:24,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 04:40:24,556 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-12-14 04:40:24,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:24,557 INFO L225 Difference]: With dead ends: 44 [2022-12-14 04:40:24,557 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 04:40:24,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 04:40:24,558 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 3 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:24,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 67 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:40:24,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 04:40:24,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2022-12-14 04:40:24,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.76) internal successors, (44), 40 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2022-12-14 04:40:24,563 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 4 [2022-12-14 04:40:24,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:24,563 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2022-12-14 04:40:24,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,563 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2022-12-14 04:40:24,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-12-14 04:40:24,564 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:24,564 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-12-14 04:40:24,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 04:40:24,564 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:24,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:24,565 INFO L85 PathProgramCache]: Analyzing trace with hash 106825754, now seen corresponding path program 1 times [2022-12-14 04:40:24,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:24,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759390132] [2022-12-14 04:40:24,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:24,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:24,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:24,601 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:24,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:24,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759390132] [2022-12-14 04:40:24,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759390132] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:40:24,601 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:40:24,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 04:40:24,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673330642] [2022-12-14 04:40:24,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:40:24,602 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 04:40:24,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:24,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 04:40:24,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 04:40:24,603 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:24,625 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2022-12-14 04:40:24,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 04:40:24,625 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-12-14 04:40:24,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:24,626 INFO L225 Difference]: With dead ends: 44 [2022-12-14 04:40:24,626 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 04:40:24,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 04:40:24,627 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 48 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:24,628 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 61 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:40:24,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 04:40:24,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2022-12-14 04:40:24,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.72) internal successors, (43), 40 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-12-14 04:40:24,631 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 5 [2022-12-14 04:40:24,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:24,632 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-12-14 04:40:24,632 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:24,632 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-12-14 04:40:24,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 04:40:24,632 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:24,633 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2022-12-14 04:40:24,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-12-14 04:40:24,633 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:24,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:24,633 INFO L85 PathProgramCache]: Analyzing trace with hash -985496187, now seen corresponding path program 1 times [2022-12-14 04:40:24,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:24,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621981723] [2022-12-14 04:40:24,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:24,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:24,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:24,847 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:24,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:24,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621981723] [2022-12-14 04:40:24,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [621981723] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:40:24,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608393434] [2022-12-14 04:40:24,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:24,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:24,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:40:24,849 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:40:24,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 04:40:24,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:24,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 04:40:24,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:40:24,959 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-12-14 04:40:24,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2022-12-14 04:40:25,036 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:25,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:40:25,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:25,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608393434] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:40:25,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986824206] [2022-12-14 04:40:25,123 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 04:40:25,123 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:40:25,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:40:25,130 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:40:25,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:40:25,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,170 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-12-14 04:40:25,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,198 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2022-12-14 04:40:25,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,249 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 47 [2022-12-14 04:40:25,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,372 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 04:40:25,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:25,396 INFO L321 Elim1Store]: treesize reduction 112, result has 13.2 percent of original size [2022-12-14 04:40:25,396 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 307 treesize of output 303 [2022-12-14 04:40:25,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:25,469 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:40:25,699 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '520#(and (not (<= (+ ~a~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~a~0.base))) (< |ULTIMATE.start_foo_~i~0#1| ~n~0) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-12-14 04:40:25,699 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:40:25,699 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 04:40:25,699 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 10 [2022-12-14 04:40:25,699 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793366659] [2022-12-14 04:40:25,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 04:40:25,700 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 04:40:25,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:25,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 04:40:25,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2022-12-14 04:40:25,701 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:25,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:25,898 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2022-12-14 04:40:25,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 04:40:25,899 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 04:40:25,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:25,899 INFO L225 Difference]: With dead ends: 53 [2022-12-14 04:40:25,899 INFO L226 Difference]: Without dead ends: 53 [2022-12-14 04:40:25,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=322, Unknown=0, NotChecked=0, Total=420 [2022-12-14 04:40:25,900 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 155 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:25,900 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 112 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 04:40:25,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-12-14 04:40:25,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 49. [2022-12-14 04:40:25,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 48 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:25,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2022-12-14 04:40:25,903 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 6 [2022-12-14 04:40:25,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:25,903 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2022-12-14 04:40:25,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:25,903 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2022-12-14 04:40:25,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 04:40:25,903 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:25,904 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2022-12-14 04:40:25,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 04:40:26,104 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:26,106 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:26,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:26,107 INFO L85 PathProgramCache]: Analyzing trace with hash 1481519764, now seen corresponding path program 1 times [2022-12-14 04:40:26,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:26,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699601408] [2022-12-14 04:40:26,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:26,108 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:26,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:26,226 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 04:40:26,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:26,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699601408] [2022-12-14 04:40:26,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699601408] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:40:26,227 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:40:26,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 04:40:26,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211654336] [2022-12-14 04:40:26,228 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:40:26,229 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 04:40:26,229 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:26,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 04:40:26,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 04:40:26,231 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:26,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:26,287 INFO L93 Difference]: Finished difference Result 47 states and 53 transitions. [2022-12-14 04:40:26,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 04:40:26,288 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 04:40:26,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:26,288 INFO L225 Difference]: With dead ends: 47 [2022-12-14 04:40:26,288 INFO L226 Difference]: Without dead ends: 47 [2022-12-14 04:40:26,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-12-14 04:40:26,289 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 14 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:26,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 46 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:40:26,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-12-14 04:40:26,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-12-14 04:40:26,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 46 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:26,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2022-12-14 04:40:26,292 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 9 [2022-12-14 04:40:26,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:26,292 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2022-12-14 04:40:26,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:26,292 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2022-12-14 04:40:26,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 04:40:26,293 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:26,293 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2022-12-14 04:40:26,293 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-12-14 04:40:26,293 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:26,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:26,293 INFO L85 PathProgramCache]: Analyzing trace with hash 1481519765, now seen corresponding path program 1 times [2022-12-14 04:40:26,293 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:26,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403093000] [2022-12-14 04:40:26,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:26,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:26,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:26,339 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:26,339 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:26,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403093000] [2022-12-14 04:40:26,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1403093000] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:40:26,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1281504985] [2022-12-14 04:40:26,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:26,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:26,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:40:26,341 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:40:26,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 04:40:26,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:26,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 04:40:26,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:40:26,418 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:26,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:40:26,445 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:26,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1281504985] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:40:26,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1920875941] [2022-12-14 04:40:26,448 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 04:40:26,448 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:40:26,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:40:26,448 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:40:26,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:40:26,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,470 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-12-14 04:40:26,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,496 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2022-12-14 04:40:26,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,527 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 47 [2022-12-14 04:40:26,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,612 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 04:40:26,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:26,635 INFO L321 Elim1Store]: treesize reduction 112, result has 13.2 percent of original size [2022-12-14 04:40:26,636 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 307 treesize of output 303 [2022-12-14 04:40:26,689 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:26,725 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:40:26,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '797#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |ULTIMATE.start_foo_~i~0#1| 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 04:40:26,906 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:40:26,906 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 04:40:26,906 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2022-12-14 04:40:26,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550674066] [2022-12-14 04:40:26,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 04:40:26,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 04:40:26,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:26,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 04:40:26,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=194, Unknown=0, NotChecked=0, Total=306 [2022-12-14 04:40:26,908 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:26,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:26,990 INFO L93 Difference]: Finished difference Result 111 states and 115 transitions. [2022-12-14 04:40:26,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 04:40:26,991 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 04:40:26,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:26,992 INFO L225 Difference]: With dead ends: 111 [2022-12-14 04:40:26,992 INFO L226 Difference]: Without dead ends: 111 [2022-12-14 04:40:26,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=152, Invalid=268, Unknown=0, NotChecked=0, Total=420 [2022-12-14 04:40:26,993 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 278 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:26,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [278 Valid, 156 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:40:26,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-12-14 04:40:26,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 50. [2022-12-14 04:40:26,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 49 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:26,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-12-14 04:40:26,999 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 9 [2022-12-14 04:40:26,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:26,999 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-12-14 04:40:27,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:27,000 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-12-14 04:40:27,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 04:40:27,000 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:27,000 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2022-12-14 04:40:27,005 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 04:40:27,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-12-14 04:40:27,201 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:27,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:27,202 INFO L85 PathProgramCache]: Analyzing trace with hash -1172884082, now seen corresponding path program 2 times [2022-12-14 04:40:27,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:27,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095033290] [2022-12-14 04:40:27,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:27,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:27,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:27,519 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:27,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:27,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095033290] [2022-12-14 04:40:27,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095033290] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:40:27,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883431614] [2022-12-14 04:40:27,520 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 04:40:27,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:27,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:40:27,521 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:40:27,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 04:40:27,561 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 04:40:27,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 04:40:27,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 15 conjunts are in the unsatisfiable core [2022-12-14 04:40:27,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:40:27,577 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-12-14 04:40:27,577 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 19 [2022-12-14 04:40:27,732 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 04:40:27,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:40:27,871 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 04:40:27,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883431614] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:40:27,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [969357302] [2022-12-14 04:40:27,873 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 04:40:27,873 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:40:27,873 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:40:27,874 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:40:27,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:40:27,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:27,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:27,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:27,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:27,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:27,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-12-14 04:40:27,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:27,914 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2022-12-14 04:40:27,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:27,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:27,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:27,937 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 47 [2022-12-14 04:40:27,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:28,000 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 04:40:28,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:28,022 INFO L321 Elim1Store]: treesize reduction 112, result has 13.2 percent of original size [2022-12-14 04:40:28,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 307 treesize of output 303 [2022-12-14 04:40:28,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:28,081 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:40:28,328 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1052#(and (not (<= (+ ~a~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~a~0.base))) (< |ULTIMATE.start_foo_~i~0#1| ~n~0) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-12-14 04:40:28,329 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:40:28,329 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 04:40:28,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 15 [2022-12-14 04:40:28,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002111008] [2022-12-14 04:40:28,329 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 04:40:28,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 04:40:28,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:28,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 04:40:28,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2022-12-14 04:40:28,331 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 17 states, 16 states have (on average 1.625) internal successors, (26), 16 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:28,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:28,594 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2022-12-14 04:40:28,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 04:40:28,595 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.625) internal successors, (26), 16 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-12-14 04:40:28,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:28,595 INFO L225 Difference]: With dead ends: 49 [2022-12-14 04:40:28,596 INFO L226 Difference]: Without dead ends: 49 [2022-12-14 04:40:28,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=154, Invalid=602, Unknown=0, NotChecked=0, Total=756 [2022-12-14 04:40:28,597 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 69 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:28,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 83 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 04:40:28,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-12-14 04:40:28,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-12-14 04:40:28,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 38 states have (on average 1.394736842105263) internal successors, (53), 48 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:28,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2022-12-14 04:40:28,600 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 12 [2022-12-14 04:40:28,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:28,601 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2022-12-14 04:40:28,601 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.625) internal successors, (26), 16 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:28,601 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2022-12-14 04:40:28,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-12-14 04:40:28,601 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:28,601 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1] [2022-12-14 04:40:28,607 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 04:40:28,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-12-14 04:40:28,802 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:28,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:28,803 INFO L85 PathProgramCache]: Analyzing trace with hash -845963127, now seen corresponding path program 2 times [2022-12-14 04:40:28,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:28,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263421827] [2022-12-14 04:40:28,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:28,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:28,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:28,910 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 04:40:28,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:28,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263421827] [2022-12-14 04:40:28,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263421827] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:40:28,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38958957] [2022-12-14 04:40:28,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 04:40:28,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:28,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:40:28,912 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:40:28,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 04:40:28,955 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-12-14 04:40:28,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 04:40:28,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 04:40:28,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:40:28,967 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 04:40:28,968 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-12-14 04:40:29,017 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 04:40:29,017 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 04:40:29,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38958957] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:40:29,017 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 04:40:29,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [9] total 11 [2022-12-14 04:40:29,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778753476] [2022-12-14 04:40:29,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:40:29,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 04:40:29,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:29,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 04:40:29,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2022-12-14 04:40:29,018 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:29,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:29,032 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-12-14 04:40:29,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 04:40:29,032 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-12-14 04:40:29,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:29,033 INFO L225 Difference]: With dead ends: 25 [2022-12-14 04:40:29,033 INFO L226 Difference]: Without dead ends: 25 [2022-12-14 04:40:29,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2022-12-14 04:40:29,033 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 7 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:29,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 0 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:40:29,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-12-14 04:40:29,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-12-14 04:40:29,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:29,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-12-14 04:40:29,035 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2022-12-14 04:40:29,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:29,035 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-12-14 04:40:29,035 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:29,035 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-12-14 04:40:29,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 04:40:29,036 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:29,036 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 2, 1, 1, 1, 1, 1] [2022-12-14 04:40:29,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-12-14 04:40:29,236 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:29,237 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:29,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:29,239 INFO L85 PathProgramCache]: Analyzing trace with hash -1221701863, now seen corresponding path program 1 times [2022-12-14 04:40:29,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:29,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364979088] [2022-12-14 04:40:29,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:29,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:29,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:29,405 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 04:40:29,405 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:29,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364979088] [2022-12-14 04:40:29,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364979088] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:40:29,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540449106] [2022-12-14 04:40:29,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:29,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:29,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:40:29,406 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:40:29,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 04:40:29,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:29,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 04:40:29,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:40:29,544 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 04:40:29,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:40:29,634 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 04:40:29,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540449106] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:40:29,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [950550259] [2022-12-14 04:40:29,636 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 04:40:29,637 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:40:29,637 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:40:29,637 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:40:29,637 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:40:29,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,655 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-12-14 04:40:29,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2022-12-14 04:40:29,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 47 [2022-12-14 04:40:29,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,762 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 04:40:29,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:29,785 INFO L321 Elim1Store]: treesize reduction 112, result has 13.2 percent of original size [2022-12-14 04:40:29,785 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 307 treesize of output 303 [2022-12-14 04:40:29,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:29,858 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:29,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 78 [2022-12-14 04:40:29,902 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:29,926 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:29,936 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:40:30,120 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1411#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-12-14 04:40:30,120 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:40:30,120 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 04:40:30,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 24 [2022-12-14 04:40:30,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261900318] [2022-12-14 04:40:30,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 04:40:30,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 04:40:30,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:30,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 04:40:30,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=534, Unknown=0, NotChecked=0, Total=812 [2022-12-14 04:40:30,123 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:30,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:30,325 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2022-12-14 04:40:30,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 04:40:30,325 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-12-14 04:40:30,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:30,326 INFO L225 Difference]: With dead ends: 84 [2022-12-14 04:40:30,326 INFO L226 Difference]: Without dead ends: 84 [2022-12-14 04:40:30,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=412, Invalid=848, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 04:40:30,327 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 216 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:30,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [216 Valid, 11 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 04:40:30,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-12-14 04:40:30,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 49. [2022-12-14 04:40:30,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 48 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:30,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 55 transitions. [2022-12-14 04:40:30,332 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 55 transitions. Word has length 19 [2022-12-14 04:40:30,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:30,332 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 55 transitions. [2022-12-14 04:40:30,332 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:30,332 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 55 transitions. [2022-12-14 04:40:30,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 04:40:30,332 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:30,332 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 2, 1, 1, 1, 1, 1] [2022-12-14 04:40:30,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 04:40:30,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:30,533 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:30,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:30,534 INFO L85 PathProgramCache]: Analyzing trace with hash -2074921727, now seen corresponding path program 2 times [2022-12-14 04:40:30,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:30,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551728402] [2022-12-14 04:40:30,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:30,534 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:30,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:30,765 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 04:40:30,765 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:30,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551728402] [2022-12-14 04:40:30,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551728402] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:40:30,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854884044] [2022-12-14 04:40:30,766 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 04:40:30,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:30,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:40:30,767 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:40:30,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 04:40:30,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 04:40:30,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 04:40:30,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 04:40:30,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:40:30,841 INFO L350 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 10 treesize of output 8 [2022-12-14 04:40:30,850 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2022-12-14 04:40:31,375 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-12-14 04:40:31,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:40:31,566 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-12-14 04:40:31,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854884044] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:40:31,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [981363370] [2022-12-14 04:40:31,568 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 04:40:31,568 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:40:31,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:40:31,568 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:40:31,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:40:31,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:31,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:31,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:31,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:31,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:31,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-12-14 04:40:31,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:31,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 04:40:31,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:31,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:31,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:31,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 40 [2022-12-14 04:40:31,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:31,669 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 04:40:31,693 INFO L321 Elim1Store]: treesize reduction 108, result has 20.6 percent of original size [2022-12-14 04:40:31,693 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 298 treesize of output 302 [2022-12-14 04:40:31,766 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:31,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 9 [2022-12-14 04:40:31,792 INFO L321 Elim1Store]: treesize reduction 17, result has 43.3 percent of original size [2022-12-14 04:40:31,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 72 treesize of output 79 [2022-12-14 04:40:31,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:31,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:31,848 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:40:32,100 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1792#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-12-14 04:40:32,100 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:40:32,100 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 04:40:32,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 4, 4] total 25 [2022-12-14 04:40:32,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908185009] [2022-12-14 04:40:32,101 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 04:40:32,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 04:40:32,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:32,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 04:40:32,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=670, Unknown=0, NotChecked=0, Total=870 [2022-12-14 04:40:32,102 INFO L87 Difference]: Start difference. First operand 49 states and 55 transitions. Second operand has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:33,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:33,268 INFO L93 Difference]: Finished difference Result 96 states and 97 transitions. [2022-12-14 04:40:33,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 04:40:33,268 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-12-14 04:40:33,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:33,269 INFO L225 Difference]: With dead ends: 96 [2022-12-14 04:40:33,269 INFO L226 Difference]: Without dead ends: 96 [2022-12-14 04:40:33,269 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1024, Invalid=2758, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 04:40:33,270 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 311 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 311 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:33,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [311 Valid, 0 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 04:40:33,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-12-14 04:40:33,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 51. [2022-12-14 04:40:33,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 50 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:33,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2022-12-14 04:40:33,272 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 35 [2022-12-14 04:40:33,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:33,272 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2022-12-14 04:40:33,272 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:33,273 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2022-12-14 04:40:33,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 04:40:33,274 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:33,274 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 5, 4, 1, 1, 1, 1] [2022-12-14 04:40:33,278 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 04:40:33,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 04:40:33,476 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:33,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:33,477 INFO L85 PathProgramCache]: Analyzing trace with hash -1783322866, now seen corresponding path program 3 times [2022-12-14 04:40:33,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:33,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634525641] [2022-12-14 04:40:33,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:33,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:33,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:33,754 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 04:40:33,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:33,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634525641] [2022-12-14 04:40:33,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634525641] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:40:33,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1081621191] [2022-12-14 04:40:33,755 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 04:40:33,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:33,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:40:33,756 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:40:33,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 04:40:33,999 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 04:40:33,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 04:40:34,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 04:40:34,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:40:34,188 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 04:40:34,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:40:34,450 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 04:40:34,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1081621191] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:40:34,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [226447377] [2022-12-14 04:40:34,452 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 04:40:34,452 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:40:34,452 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:40:34,453 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:40:34,453 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:40:34,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:34,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:34,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:34,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:34,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:34,466 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-12-14 04:40:34,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:34,482 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 04:40:34,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:34,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:34,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:34,509 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 40 [2022-12-14 04:40:34,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:34,556 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 04:40:34,583 INFO L321 Elim1Store]: treesize reduction 108, result has 20.6 percent of original size [2022-12-14 04:40:34,583 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 298 treesize of output 302 [2022-12-14 04:40:34,631 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:34,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 9 [2022-12-14 04:40:34,672 INFO L321 Elim1Store]: treesize reduction 17, result has 43.3 percent of original size [2022-12-14 04:40:34,672 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 72 treesize of output 79 [2022-12-14 04:40:34,694 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:34,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:34,712 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:40:34,951 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2311#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-12-14 04:40:34,952 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:40:34,952 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 04:40:34,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 51 [2022-12-14 04:40:34,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001273307] [2022-12-14 04:40:34,952 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 04:40:34,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 04:40:34,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:34,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 04:40:34,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1183, Invalid=2009, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 04:40:34,954 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand has 52 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:35,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:35,439 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2022-12-14 04:40:35,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 04:40:35,439 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2022-12-14 04:40:35,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:35,440 INFO L225 Difference]: With dead ends: 189 [2022-12-14 04:40:35,440 INFO L226 Difference]: Without dead ends: 189 [2022-12-14 04:40:35,441 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1999 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1776, Invalid=3480, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 04:40:35,442 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 434 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 434 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:35,442 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [434 Valid, 18 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 04:40:35,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2022-12-14 04:40:35,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 103. [2022-12-14 04:40:35,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 101 states have (on average 1.1386138613861385) internal successors, (115), 102 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:35,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 115 transitions. [2022-12-14 04:40:35,447 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 115 transitions. Word has length 43 [2022-12-14 04:40:35,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:35,447 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 115 transitions. [2022-12-14 04:40:35,447 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:35,447 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 115 transitions. [2022-12-14 04:40:35,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-12-14 04:40:35,449 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:35,449 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 5, 4, 1, 1, 1, 1] [2022-12-14 04:40:35,454 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 04:40:35,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:35,650 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:35,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:35,651 INFO L85 PathProgramCache]: Analyzing trace with hash -390223877, now seen corresponding path program 4 times [2022-12-14 04:40:35,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:35,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170450365] [2022-12-14 04:40:35,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:35,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:35,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:36,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1044 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 04:40:36,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:36,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170450365] [2022-12-14 04:40:36,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170450365] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:40:36,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832207667] [2022-12-14 04:40:36,470 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 04:40:36,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:36,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:40:36,471 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:40:36,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 04:40:36,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:36,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 35 conjunts are in the unsatisfiable core [2022-12-14 04:40:36,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:40:37,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1044 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 04:40:37,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:40:38,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1044 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 04:40:38,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832207667] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:40:38,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [51133046] [2022-12-14 04:40:38,145 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 04:40:38,145 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:40:38,145 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:40:38,145 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:40:38,145 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:40:38,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,158 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-12-14 04:40:38,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,176 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2022-12-14 04:40:38,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,196 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 47 [2022-12-14 04:40:38,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,250 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 04:40:38,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:38,271 INFO L321 Elim1Store]: treesize reduction 112, result has 13.2 percent of original size [2022-12-14 04:40:38,271 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 307 treesize of output 303 [2022-12-14 04:40:38,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:38,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:38,350 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 78 [2022-12-14 04:40:38,373 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:38,394 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:38,405 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:40:38,637 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3199#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-12-14 04:40:38,637 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:40:38,637 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 04:40:38,637 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 102 [2022-12-14 04:40:38,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495888119] [2022-12-14 04:40:38,638 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 04:40:38,638 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-12-14 04:40:38,638 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:38,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-12-14 04:40:38,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4646, Invalid=6696, Unknown=0, NotChecked=0, Total=11342 [2022-12-14 04:40:38,641 INFO L87 Difference]: Start difference. First operand 103 states and 115 transitions. Second operand has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:40,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:40:40,356 INFO L93 Difference]: Finished difference Result 393 states and 394 transitions. [2022-12-14 04:40:40,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-12-14 04:40:40,357 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2022-12-14 04:40:40,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:40:40,358 INFO L225 Difference]: With dead ends: 393 [2022-12-14 04:40:40,358 INFO L226 Difference]: Without dead ends: 393 [2022-12-14 04:40:40,360 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7290 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=6990, Invalid=12470, Unknown=0, NotChecked=0, Total=19460 [2022-12-14 04:40:40,361 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 1089 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 345 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1089 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 345 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 04:40:40,361 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1089 Valid, 34 Invalid, 787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [345 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 04:40:40,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2022-12-14 04:40:40,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 205. [2022-12-14 04:40:40,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 203 states have (on average 1.1527093596059113) internal successors, (234), 204 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:40,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 234 transitions. [2022-12-14 04:40:40,365 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 234 transitions. Word has length 77 [2022-12-14 04:40:40,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:40:40,365 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 234 transitions. [2022-12-14 04:40:40,365 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:40:40,365 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 234 transitions. [2022-12-14 04:40:40,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-12-14 04:40:40,366 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:40:40,366 INFO L195 NwaCegarLoop]: trace histogram [66, 66, 5, 4, 1, 1, 1, 1] [2022-12-14 04:40:40,371 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 04:40:40,567 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 04:40:40,568 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:40:40,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:40:40,569 INFO L85 PathProgramCache]: Analyzing trace with hash -1220868075, now seen corresponding path program 5 times [2022-12-14 04:40:40,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:40:40,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922096422] [2022-12-14 04:40:40,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:40:40,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:40:40,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:40:43,049 INFO L134 CoverageAnalysis]: Checked inductivity of 4376 backedges. 0 proven. 4356 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 04:40:43,049 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:40:43,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922096422] [2022-12-14 04:40:43,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1922096422] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:40:43,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726761629] [2022-12-14 04:40:43,050 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 04:40:43,050 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:40:43,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:40:43,051 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:40:43,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 04:40:43,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 04:40:43,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 04:40:43,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 04:40:43,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:40:43,164 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 04:40:43,164 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-12-14 04:40:43,171 INFO L350 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 10 treesize of output 8 [2022-12-14 04:40:44,818 INFO L134 CoverageAnalysis]: Checked inductivity of 4376 backedges. 8 proven. 66 refuted. 0 times theorem prover too weak. 4302 trivial. 0 not checked. [2022-12-14 04:40:44,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:40:45,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4376 backedges. 0 proven. 74 refuted. 0 times theorem prover too weak. 4302 trivial. 0 not checked. [2022-12-14 04:40:45,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726761629] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:40:45,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [683024077] [2022-12-14 04:40:45,697 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 04:40:45,697 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:40:45,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:40:45,697 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:40:45,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:40:45,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:45,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:45,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:45,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:45,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:45,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-12-14 04:40:45,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:45,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 04:40:45,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:45,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:45,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:45,756 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 40 [2022-12-14 04:40:45,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:40:45,814 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 04:40:45,844 INFO L321 Elim1Store]: treesize reduction 108, result has 20.6 percent of original size [2022-12-14 04:40:45,845 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 298 treesize of output 302 [2022-12-14 04:40:45,893 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:45,918 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 9 [2022-12-14 04:40:45,940 INFO L321 Elim1Store]: treesize reduction 17, result has 43.3 percent of original size [2022-12-14 04:40:45,940 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 72 treesize of output 79 [2022-12-14 04:40:45,976 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:45,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:40:46,007 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:40:46,632 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4811#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-12-14 04:40:46,632 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:40:46,632 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 04:40:46,632 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 5, 5] total 79 [2022-12-14 04:40:46,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750221237] [2022-12-14 04:40:46,632 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 04:40:46,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-12-14 04:40:46,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:40:46,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-12-14 04:40:46,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2478, Invalid=4494, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 04:40:46,634 INFO L87 Difference]: Start difference. First operand 205 states and 234 transitions. Second operand has 80 states, 80 states have (on average 2.0) internal successors, (160), 79 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:41:15,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:41:15,774 INFO L93 Difference]: Finished difference Result 344 states and 345 transitions. [2022-12-14 04:41:15,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 205 states. [2022-12-14 04:41:15,774 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.0) internal successors, (160), 79 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2022-12-14 04:41:15,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:41:15,776 INFO L225 Difference]: With dead ends: 344 [2022-12-14 04:41:15,776 INFO L226 Difference]: Without dead ends: 344 [2022-12-14 04:41:15,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 705 GetRequests, 415 SyntacticMatches, 5 SemanticMatches, 285 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24033 ImplicationChecksByTransitivity, 30.4s TimeCoverageRelationStatistics Valid=20386, Invalid=61696, Unknown=0, NotChecked=0, Total=82082 [2022-12-14 04:41:15,781 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 1062 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 230 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1062 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 04:41:15,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1062 Valid, 0 Invalid, 639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 04:41:15,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2022-12-14 04:41:15,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 206. [2022-12-14 04:41:15,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 205 states have (on average 1.0097560975609756) internal successors, (207), 205 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:41:15,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 207 transitions. [2022-12-14 04:41:15,785 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 207 transitions. Word has length 145 [2022-12-14 04:41:15,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:41:15,785 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 207 transitions. [2022-12-14 04:41:15,785 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.0) internal successors, (160), 79 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:41:15,785 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 207 transitions. [2022-12-14 04:41:15,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2022-12-14 04:41:15,787 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:41:15,787 INFO L195 NwaCegarLoop]: trace histogram [67, 67, 33, 33, 1, 1, 1, 1, 1] [2022-12-14 04:41:15,792 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 04:41:15,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 04:41:15,988 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:41:15,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:41:15,990 INFO L85 PathProgramCache]: Analyzing trace with hash -587523307, now seen corresponding path program 1 times [2022-12-14 04:41:15,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:41:15,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326358253] [2022-12-14 04:41:15,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:41:15,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:41:16,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:41:18,778 INFO L134 CoverageAnalysis]: Checked inductivity of 5578 backedges. 0 proven. 4489 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2022-12-14 04:41:18,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:41:18,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326358253] [2022-12-14 04:41:18,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326358253] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:41:18,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026846586] [2022-12-14 04:41:18,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:41:18,779 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:41:18,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:41:18,780 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:41:18,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 04:41:19,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:41:19,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 1167 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 04:41:19,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:41:20,932 INFO L134 CoverageAnalysis]: Checked inductivity of 5578 backedges. 0 proven. 4489 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2022-12-14 04:41:20,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:41:24,631 INFO L134 CoverageAnalysis]: Checked inductivity of 5578 backedges. 0 proven. 4489 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2022-12-14 04:41:24,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026846586] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:41:24,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1125365222] [2022-12-14 04:41:24,632 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 04:41:24,632 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:41:24,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:41:24,633 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:41:24,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:41:24,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,647 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-12-14 04:41:24,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 04:41:24,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,688 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 45 [2022-12-14 04:41:24,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 04:41:24,768 INFO L321 Elim1Store]: treesize reduction 108, result has 12.2 percent of original size [2022-12-14 04:41:24,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 303 treesize of output 301 [2022-12-14 04:41:24,809 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:41:24,817 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 9 [2022-12-14 04:41:24,839 INFO L321 Elim1Store]: treesize reduction 17, result has 43.3 percent of original size [2022-12-14 04:41:24,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 72 treesize of output 79 [2022-12-14 04:41:24,865 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:41:24,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 04:41:24,885 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:41:25,425 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7195#(and (= (+ (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4) (* |ULTIMATE.start_foo_~i~0#1| 4))) 1) 0) (= (select |#valid| ~b~0.base) 1) (<= (+ ~b~0.offset (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base)) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 127 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-12-14 04:41:25,425 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:41:25,425 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 04:41:25,425 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 199 [2022-12-14 04:41:25,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446273432] [2022-12-14 04:41:25,425 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 04:41:25,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 200 states [2022-12-14 04:41:25,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:41:25,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 200 interpolants. [2022-12-14 04:41:25,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17460, Invalid=24360, Unknown=0, NotChecked=0, Total=41820 [2022-12-14 04:41:25,435 INFO L87 Difference]: Start difference. First operand 206 states and 207 transitions. Second operand has 200 states, 200 states have (on average 2.0) internal successors, (400), 199 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:41:33,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:41:33,003 INFO L93 Difference]: Finished difference Result 634 states and 635 transitions. [2022-12-14 04:41:33,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2022-12-14 04:41:33,003 INFO L78 Accepts]: Start accepts. Automaton has has 200 states, 200 states have (on average 2.0) internal successors, (400), 199 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 205 [2022-12-14 04:41:33,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:41:33,004 INFO L225 Difference]: With dead ends: 634 [2022-12-14 04:41:33,004 INFO L226 Difference]: Without dead ends: 634 [2022-12-14 04:41:33,007 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 743 GetRequests, 471 SyntacticMatches, 9 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28857 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=25441, Invalid=44519, Unknown=0, NotChecked=0, Total=69960 [2022-12-14 04:41:33,007 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 1564 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 737 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1564 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 1466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 737 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 04:41:33,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1564 Valid, 67 Invalid, 1466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [737 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 04:41:33,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2022-12-14 04:41:33,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 398. [2022-12-14 04:41:33,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 398 states, 397 states have (on average 1.0050377833753148) internal successors, (399), 397 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:41:33,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 399 transitions. [2022-12-14 04:41:33,012 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 399 transitions. Word has length 205 [2022-12-14 04:41:33,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:41:33,012 INFO L495 AbstractCegarLoop]: Abstraction has 398 states and 399 transitions. [2022-12-14 04:41:33,012 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 200 states, 200 states have (on average 2.0) internal successors, (400), 199 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 04:41:33,012 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 399 transitions. [2022-12-14 04:41:33,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 398 [2022-12-14 04:41:33,016 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:41:33,016 INFO L195 NwaCegarLoop]: trace histogram [128, 128, 68, 68, 1, 1, 1, 1, 1] [2022-12-14 04:41:33,023 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 04:41:33,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 04:41:33,217 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 04:41:33,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:41:33,219 INFO L85 PathProgramCache]: Analyzing trace with hash -833912466, now seen corresponding path program 2 times [2022-12-14 04:41:33,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:41:33,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229885834] [2022-12-14 04:41:33,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:41:33,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:41:33,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:41:37,111 INFO L134 CoverageAnalysis]: Checked inductivity of 21008 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 16384 trivial. 0 not checked. [2022-12-14 04:41:37,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:41:37,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229885834] [2022-12-14 04:41:37,111 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229885834] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:41:37,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333366478] [2022-12-14 04:41:37,111 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 04:41:37,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:41:37,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:41:37,112 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:41:37,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccb13e4c-8f89-4b8c-8100-599be90000f3/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process