./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba --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 007fc8a389a67fb47c7d326d3f1d284696dfe5de13661e77d6d1bf7cce285194 --- 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-b5237d8 [2022-11-22 02:21:06,669 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:21:06,671 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:21:06,688 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:21:06,689 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:21:06,690 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:21:06,691 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:21:06,693 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:21:06,695 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:21:06,696 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:21:06,697 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:21:06,698 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:21:06,698 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:21:06,700 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:21:06,701 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:21:06,702 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:21:06,703 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:21:06,704 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:21:06,706 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:21:06,708 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:21:06,710 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:21:06,711 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:21:06,712 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:21:06,713 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:21:06,717 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:21:06,726 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:21:06,726 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:21:06,727 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:21:06,728 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:21:06,729 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:21:06,729 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:21:06,730 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:21:06,731 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:21:06,731 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:21:06,732 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:21:06,738 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:21:06,739 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:21:06,740 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:21:06,740 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:21:06,741 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:21:06,742 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:21:06,742 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-22 02:21:06,772 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:21:06,772 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:21:06,773 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:21:06,773 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:21:06,774 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:21:06,775 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:21:06,775 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:21:06,775 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:21:06,775 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:21:06,775 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:21:06,776 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:21:06,777 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:21:06,777 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:21:06,777 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:21:06,777 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:21:06,777 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:21:06,778 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:21:06,778 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:21:06,779 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-22 02:21:06,779 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-22 02:21:06,779 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:21:06,779 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:21:06,779 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-22 02:21:06,779 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:21:06,780 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:21:06,780 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:21:06,780 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-22 02:21:06,780 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-22 02:21:06,780 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-22 02:21:06,780 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:21:06,781 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-22 02:21:06,781 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:21:06,781 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:21:06,781 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:21:06,781 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:21:06,782 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:21:06,782 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:21:06,782 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:21:06,782 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:21:06,782 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:21:06,782 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:21:06,783 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:21:06,783 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_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 007fc8a389a67fb47c7d326d3f1d284696dfe5de13661e77d6d1bf7cce285194 [2022-11-22 02:21:07,046 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:21:07,077 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:21:07,080 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:21:07,081 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:21:07,082 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:21:07,083 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i [2022-11-22 02:21:10,206 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:21:10,429 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:21:10,430 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i [2022-11-22 02:21:10,449 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/data/ef8e030d0/f33c77be013248f2976ef1f2e9ad3b34/FLAGcc824063a [2022-11-22 02:21:10,463 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/data/ef8e030d0/f33c77be013248f2976ef1f2e9ad3b34 [2022-11-22 02:21:10,466 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:21:10,468 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:21:10,469 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:21:10,469 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:21:10,473 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:21:10,475 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:21:10" (1/1) ... [2022-11-22 02:21:10,478 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b247587 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:10, skipping insertion in model container [2022-11-22 02:21:10,478 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:21:10" (1/1) ... [2022-11-22 02:21:10,490 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:21:10,549 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:21:10,930 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:21:10,944 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:21:11,000 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:21:11,027 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:21:11,028 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11 WrapperNode [2022-11-22 02:21:11,028 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:21:11,030 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:21:11,030 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:21:11,030 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:21:11,038 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,049 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,074 INFO L138 Inliner]: procedures = 117, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2022-11-22 02:21:11,074 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:21:11,075 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:21:11,075 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:21:11,075 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:21:11,083 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,083 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,086 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,087 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,092 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,095 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,097 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,098 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,100 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:21:11,101 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:21:11,101 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:21:11,101 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:21:11,102 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (1/1) ... [2022-11-22 02:21:11,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:21:11,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:11,142 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:21:11,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:21:11,184 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-22 02:21:11,185 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-22 02:21:11,185 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-22 02:21:11,185 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-22 02:21:11,185 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:21:11,185 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:21:11,313 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:21:11,315 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:21:11,528 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:21:11,587 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:21:11,588 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-22 02:21:11,590 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:21:11 BoogieIcfgContainer [2022-11-22 02:21:11,590 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:21:11,593 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:21:11,593 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:21:11,597 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:21:11,597 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:21:10" (1/3) ... [2022-11-22 02:21:11,598 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21fefd89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:21:11, skipping insertion in model container [2022-11-22 02:21:11,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:21:11" (2/3) ... [2022-11-22 02:21:11,599 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21fefd89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:21:11, skipping insertion in model container [2022-11-22 02:21:11,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:21:11" (3/3) ... [2022-11-22 02:21:11,601 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cmemchr-alloca-2.i [2022-11-22 02:21:11,620 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:21:11,620 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2022-11-22 02:21:11,661 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:21:11,668 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;@707d56f3, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:21:11,668 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2022-11-22 02:21:11,679 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 16 states have internal predecessors, (21), 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) [2022-11-22 02:21:11,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-22 02:21:11,690 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:11,691 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-22 02:21:11,691 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:11,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:11,699 INFO L85 PathProgramCache]: Analyzing trace with hash 107409, now seen corresponding path program 1 times [2022-11-22 02:21:11,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:11,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801156167] [2022-11-22 02:21:11,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:11,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:11,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:12,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:12,030 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:12,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801156167] [2022-11-22 02:21:12,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801156167] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:21:12,031 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:21:12,032 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-22 02:21:12,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419975233] [2022-11-22 02:21:12,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:21:12,039 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 02:21:12,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:12,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 02:21:12,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 02:21:12,086 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 16 states have internal predecessors, (21), 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 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2022-11-22 02:21:12,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:12,149 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2022-11-22 02:21:12,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 02:21:12,151 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2022-11-22 02:21:12,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:12,160 INFO L225 Difference]: With dead ends: 16 [2022-11-22 02:21:12,160 INFO L226 Difference]: Without dead ends: 15 [2022-11-22 02:21:12,162 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 [2022-11-22 02:21:12,166 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:12,168 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 10 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:21:12,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-22 02:21:12,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-22 02:21:12,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 14 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) [2022-11-22 02:21:12,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-22 02:21:12,204 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 3 [2022-11-22 02:21:12,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:12,204 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-22 02:21:12,204 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2022-11-22 02:21:12,204 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-22 02:21:12,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-22 02:21:12,205 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:12,205 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-22 02:21:12,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 02:21:12,206 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:12,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:12,207 INFO L85 PathProgramCache]: Analyzing trace with hash 107410, now seen corresponding path program 1 times [2022-11-22 02:21:12,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:12,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698172237] [2022-11-22 02:21:12,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:12,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:12,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:12,545 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:12,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:12,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698172237] [2022-11-22 02:21:12,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698172237] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:21:12,547 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:21:12,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 02:21:12,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117908435] [2022-11-22 02:21:12,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:21:12,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 02:21:12,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:12,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 02:21:12,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:21:12,551 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-11-22 02:21:12,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:12,676 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2022-11-22 02:21:12,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 02:21:12,677 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2022-11-22 02:21:12,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:12,679 INFO L225 Difference]: With dead ends: 28 [2022-11-22 02:21:12,679 INFO L226 Difference]: Without dead ends: 28 [2022-11-22 02:21:12,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:21:12,690 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 29 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:12,691 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 31 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:21:12,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-22 02:21:12,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 17. [2022-11-22 02:21:12,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 16 states have internal predecessors, (21), 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) [2022-11-22 02:21:12,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2022-11-22 02:21:12,706 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 3 [2022-11-22 02:21:12,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:12,707 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2022-11-22 02:21:12,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-11-22 02:21:12,708 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2022-11-22 02:21:12,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-22 02:21:12,711 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:12,711 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2022-11-22 02:21:12,713 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 02:21:12,713 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:12,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:12,716 INFO L85 PathProgramCache]: Analyzing trace with hash 103264033, now seen corresponding path program 1 times [2022-11-22 02:21:12,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:12,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105828685] [2022-11-22 02:21:12,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:12,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:12,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:13,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:13,155 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:13,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105828685] [2022-11-22 02:21:13,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105828685] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:13,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1864240405] [2022-11-22 02:21:13,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:13,156 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:13,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:13,163 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:13,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:21:13,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:13,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 02:21:13,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:13,399 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 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-22 02:21:13,595 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:13,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:13,726 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:13,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1864240405] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:13,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [179159858] [2022-11-22 02:21:13,751 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-11-22 02:21:13,752 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:13,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:13,763 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:13,764 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:13,826 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 8 treesize of output 7 [2022-11-22 02:21:13,902 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 11 treesize of output 7 [2022-11-22 02:21:14,018 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 14 treesize of output 10 [2022-11-22 02:21:14,040 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:14,342 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '140#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (not (<= (+ |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~nondetArea~0#1.offset| 1) (select |#length| |ULTIMATE.start_main_~nondetArea~0#1.base|))) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet10#1| 127) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet10#1|)) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:21:14,342 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:14,342 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:21:14,343 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2022-11-22 02:21:14,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993264529] [2022-11-22 02:21:14,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:14,343 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-22 02:21:14,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:14,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-22 02:21:14,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-11-22 02:21:14,345 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 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) [2022-11-22 02:21:14,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:14,534 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2022-11-22 02:21:14,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:21:14,535 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 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 [2022-11-22 02:21:14,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:14,536 INFO L225 Difference]: With dead ends: 29 [2022-11-22 02:21:14,536 INFO L226 Difference]: Without dead ends: 29 [2022-11-22 02:21:14,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2022-11-22 02:21:14,538 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 60 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:14,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 60 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:21:14,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-22 02:21:14,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 15. [2022-11-22 02:21:14,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 12 states have (on average 1.5) internal successors, (18), 14 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) [2022-11-22 02:21:14,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-22 02:21:14,541 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 5 [2022-11-22 02:21:14,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:14,541 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-22 02:21:14,542 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 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) [2022-11-22 02:21:14,542 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-22 02:21:14,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-22 02:21:14,542 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:14,542 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:21:14,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 02:21:14,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:14,749 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:14,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:14,749 INFO L85 PathProgramCache]: Analyzing trace with hash 454047929, now seen corresponding path program 1 times [2022-11-22 02:21:14,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:14,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904807216] [2022-11-22 02:21:14,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:14,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:14,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:14,834 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:14,835 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:14,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904807216] [2022-11-22 02:21:14,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904807216] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:21:14,835 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:21:14,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 02:21:14,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373715115] [2022-11-22 02:21:14,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:21:14,836 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-22 02:21:14,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:14,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-22 02:21:14,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-22 02:21:14,837 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 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) [2022-11-22 02:21:14,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:14,932 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2022-11-22 02:21:14,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:21:14,933 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-22 02:21:14,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:14,934 INFO L225 Difference]: With dead ends: 16 [2022-11-22 02:21:14,934 INFO L226 Difference]: Without dead ends: 16 [2022-11-22 02:21:14,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-11-22 02:21:14,935 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 31 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:14,936 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 17 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:21:14,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-22 02:21:14,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2022-11-22 02:21:14,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:21:14,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-11-22 02:21:14,939 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 7 [2022-11-22 02:21:14,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:14,939 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-11-22 02:21:14,939 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 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) [2022-11-22 02:21:14,939 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-11-22 02:21:14,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-22 02:21:14,940 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:14,940 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:21:14,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-22 02:21:14,940 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:14,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:14,941 INFO L85 PathProgramCache]: Analyzing trace with hash 454047930, now seen corresponding path program 1 times [2022-11-22 02:21:14,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:14,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629794306] [2022-11-22 02:21:14,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:14,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:14,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:15,160 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:15,161 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:15,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629794306] [2022-11-22 02:21:15,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629794306] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:15,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625203312] [2022-11-22 02:21:15,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:15,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:15,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:15,172 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:15,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:21:15,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:15,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 02:21:15,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:15,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:15,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:15,344 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 21 treesize of output 17 [2022-11-22 02:21:15,367 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:15,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625203312] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:15,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1581308997] [2022-11-22 02:21:15,369 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-22 02:21:15,370 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:15,370 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:15,370 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:15,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:15,421 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 8 treesize of output 7 [2022-11-22 02:21:15,456 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 14 treesize of output 10 [2022-11-22 02:21:15,507 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 14 treesize of output 10 [2022-11-22 02:21:15,543 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:16,337 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '277#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start_cmemchr_#in~s#1.base| |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~n#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (= |ULTIMATE.start_cmemchr_#t~post3#1.base| |ULTIMATE.start_cmemchr_~p~0#1.base|) (= |ULTIMATE.start_cmemchr_#t~post3#1.offset| |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_cmemchr_#in~n#1| |ULTIMATE.start_cmemchr_~n#1|) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| |ULTIMATE.start_cmemchr_~s#1.offset|) (= (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1) |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (not (<= (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1) (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|))) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_cmemchr_#in~c#1| |ULTIMATE.start_cmemchr_~c#1|) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|)) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~c#1| |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_cmemchr_~s#1.base| |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| |ULTIMATE.start_main_~nondetArea~0#1.offset|) (= |#NULL.base| 0) (= |ULTIMATE.start_cmemchr_~s#1.base| |ULTIMATE.start_cmemchr_#t~post3#1.base|))' at error location [2022-11-22 02:21:16,337 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:16,338 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:21:16,338 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2022-11-22 02:21:16,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37185936] [2022-11-22 02:21:16,338 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:16,338 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 02:21:16,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:16,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 02:21:16,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-11-22 02:21:16,339 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:21:16,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:16,491 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2022-11-22 02:21:16,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:21:16,494 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-22 02:21:16,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:16,494 INFO L225 Difference]: With dead ends: 17 [2022-11-22 02:21:16,494 INFO L226 Difference]: Without dead ends: 17 [2022-11-22 02:21:16,495 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-11-22 02:21:16,495 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 47 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:16,496 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 26 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:21:16,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-22 02:21:16,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2022-11-22 02:21:16,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:21:16,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-22 02:21:16,498 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 7 [2022-11-22 02:21:16,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:16,499 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-22 02:21:16,499 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:21:16,499 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-22 02:21:16,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 02:21:16,500 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:16,500 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:21:16,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 02:21:16,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:16,701 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:16,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:16,701 INFO L85 PathProgramCache]: Analyzing trace with hash 1191320785, now seen corresponding path program 1 times [2022-11-22 02:21:16,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:16,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040650074] [2022-11-22 02:21:16,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:16,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:16,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:16,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:21:16,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:16,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040650074] [2022-11-22 02:21:16,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040650074] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:21:16,807 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:21:16,808 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 02:21:16,808 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065575498] [2022-11-22 02:21:16,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:21:16,808 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 02:21:16,809 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:16,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 02:21:16,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:21:16,810 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:21:16,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:16,831 INFO L93 Difference]: Finished difference Result 15 states and 18 transitions. [2022-11-22 02:21:16,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 02:21:16,832 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-22 02:21:16,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:16,833 INFO L225 Difference]: With dead ends: 15 [2022-11-22 02:21:16,833 INFO L226 Difference]: Without dead ends: 12 [2022-11-22 02:21:16,834 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 [2022-11-22 02:21:16,836 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 8 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:16,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 18 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:21:16,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-22 02:21:16,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-11-22 02:21:16,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 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) [2022-11-22 02:21:16,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2022-11-22 02:21:16,843 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2022-11-22 02:21:16,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:16,844 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2022-11-22 02:21:16,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:21:16,844 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2022-11-22 02:21:16,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-22 02:21:16,845 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:16,845 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:21:16,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-22 02:21:16,846 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:16,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:16,847 INFO L85 PathProgramCache]: Analyzing trace with hash 846637802, now seen corresponding path program 1 times [2022-11-22 02:21:16,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:16,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686696699] [2022-11-22 02:21:16,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:16,848 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:16,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:17,041 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:17,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:17,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686696699] [2022-11-22 02:21:17,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [686696699] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:17,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347633229] [2022-11-22 02:21:17,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:17,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:17,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:17,047 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:17,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:21:17,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:17,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 02:21:17,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:17,182 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:17,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:17,284 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:17,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347633229] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:17,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [911014021] [2022-11-22 02:21:17,286 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:21:17,286 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:17,287 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:17,287 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:17,287 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:17,318 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 8 treesize of output 7 [2022-11-22 02:21:17,350 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 7 [2022-11-22 02:21:17,390 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 14 treesize of output 10 [2022-11-22 02:21:17,926 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:19,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '430#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:21:19,471 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:19,471 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:21:19,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-22 02:21:19,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292960287] [2022-11-22 02:21:19,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:19,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-22 02:21:19,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:19,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-22 02:21:19,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-11-22 02:21:19,473 INFO L87 Difference]: Start difference. First operand 12 states and 13 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) [2022-11-22 02:21:19,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:19,580 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2022-11-22 02:21:19,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:21:19,582 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 11 [2022-11-22 02:21:19,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:19,582 INFO L225 Difference]: With dead ends: 20 [2022-11-22 02:21:19,582 INFO L226 Difference]: Without dead ends: 15 [2022-11-22 02:21:19,583 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2022-11-22 02:21:19,584 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 12 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:19,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 34 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:21:19,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-22 02:21:19,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2022-11-22 02:21:19,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 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) [2022-11-22 02:21:19,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-11-22 02:21:19,590 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-11-22 02:21:19,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:19,590 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-11-22 02:21:19,591 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) [2022-11-22 02:21:19,591 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-11-22 02:21:19,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-22 02:21:19,591 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:19,592 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:21:19,608 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-22 02:21:19,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:19,802 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:19,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:19,803 INFO L85 PathProgramCache]: Analyzing trace with hash 1973139321, now seen corresponding path program 2 times [2022-11-22 02:21:19,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:19,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102742468] [2022-11-22 02:21:19,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:19,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:19,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:20,202 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:20,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:20,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102742468] [2022-11-22 02:21:20,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102742468] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:20,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657763307] [2022-11-22 02:21:20,203 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:21:20,204 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:20,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:20,205 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:20,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:21:20,282 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 02:21:20,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:21:20,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:21:20,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:20,518 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:21:20,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:20,904 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 5 treesize of output 3 [2022-11-22 02:21:20,991 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:21:20,991 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657763307] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:20,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [131638522] [2022-11-22 02:21:20,994 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:21:20,994 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:20,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:20,995 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:20,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:21,033 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 8 treesize of output 7 [2022-11-22 02:21:21,095 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 14 treesize of output 10 [2022-11-22 02:21:21,144 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 14 treesize of output 10 [2022-11-22 02:21:21,653 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:23,674 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '575#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:21:23,674 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:23,674 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:21:23,674 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10] total 25 [2022-11-22 02:21:23,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208153740] [2022-11-22 02:21:23,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:23,675 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-22 02:21:23,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:23,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-22 02:21:23,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1057, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 02:21:23,677 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 27 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 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) [2022-11-22 02:21:24,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:24,381 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2022-11-22 02:21:24,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-22 02:21:24,382 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-22 02:21:24,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:24,383 INFO L225 Difference]: With dead ends: 20 [2022-11-22 02:21:24,383 INFO L226 Difference]: Without dead ends: 20 [2022-11-22 02:21:24,384 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=325, Invalid=1837, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 02:21:24,385 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 109 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:24,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 2 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:21:24,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-22 02:21:24,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2022-11-22 02:21:24,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:21:24,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-11-22 02:21:24,389 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2022-11-22 02:21:24,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:24,389 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-11-22 02:21:24,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 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) [2022-11-22 02:21:24,390 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-11-22 02:21:24,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-22 02:21:24,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:24,390 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-22 02:21:24,400 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-22 02:21:24,595 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:24,595 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:24,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:24,597 INFO L85 PathProgramCache]: Analyzing trace with hash 1234612777, now seen corresponding path program 3 times [2022-11-22 02:21:24,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:24,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549863122] [2022-11-22 02:21:24,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:24,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:24,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:24,835 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:24,835 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:24,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549863122] [2022-11-22 02:21:24,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549863122] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:24,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997987892] [2022-11-22 02:21:24,836 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:21:24,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:24,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:24,838 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:24,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:21:24,956 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:21:24,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:21:24,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-22 02:21:24,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:25,061 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:25,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:25,254 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:25,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997987892] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:25,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2128417681] [2022-11-22 02:21:25,257 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:21:25,257 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:25,257 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:25,258 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:25,258 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:25,274 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 8 treesize of output 7 [2022-11-22 02:21:25,308 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 11 treesize of output 7 [2022-11-22 02:21:25,339 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 14 treesize of output 10 [2022-11-22 02:21:25,791 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:27,179 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '759#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:21:27,179 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:27,179 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:21:27,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2022-11-22 02:21:27,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612454086] [2022-11-22 02:21:27,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:27,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 02:21:27,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:27,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 02:21:27,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2022-11-22 02:21:27,181 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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) [2022-11-22 02:21:27,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:27,393 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2022-11-22 02:21:27,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 02:21:27,393 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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 [2022-11-22 02:21:27,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:27,394 INFO L225 Difference]: With dead ends: 30 [2022-11-22 02:21:27,394 INFO L226 Difference]: Without dead ends: 21 [2022-11-22 02:21:27,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=104, Invalid=766, Unknown=0, NotChecked=0, Total=870 [2022-11-22 02:21:27,395 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 20 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:27,396 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 80 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:21:27,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-22 02:21:27,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-11-22 02:21:27,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 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) [2022-11-22 02:21:27,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-22 02:21:27,398 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2022-11-22 02:21:27,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:27,399 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-22 02:21:27,399 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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) [2022-11-22 02:21:27,399 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-22 02:21:27,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-22 02:21:27,400 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:27,400 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2022-11-22 02:21:27,407 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-22 02:21:27,605 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-22 02:21:27,606 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:27,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:27,607 INFO L85 PathProgramCache]: Analyzing trace with hash 878565240, now seen corresponding path program 4 times [2022-11-22 02:21:27,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:27,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625050919] [2022-11-22 02:21:27,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:27,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:27,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:28,018 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:28,018 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:28,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625050919] [2022-11-22 02:21:28,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625050919] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:28,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256866370] [2022-11-22 02:21:28,018 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:21:28,018 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:28,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:28,019 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:28,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:21:28,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:28,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:21:28,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:28,295 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:28,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:28,541 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 7 treesize of output 5 [2022-11-22 02:21:28,587 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:28,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256866370] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:28,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1667631552] [2022-11-22 02:21:28,589 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:21:28,590 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:28,590 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:28,590 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:28,591 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:28,609 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 8 treesize of output 7 [2022-11-22 02:21:28,656 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 14 treesize of output 10 [2022-11-22 02:21:28,702 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 14 treesize of output 10 [2022-11-22 02:21:29,175 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:30,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '959#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:21:30,877 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:30,877 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:21:30,877 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 24 [2022-11-22 02:21:30,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039783180] [2022-11-22 02:21:30,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:30,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-22 02:21:30,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:30,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-22 02:21:30,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=994, Unknown=0, NotChecked=0, Total=1122 [2022-11-22 02:21:30,879 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 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) [2022-11-22 02:21:31,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:31,310 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2022-11-22 02:21:31,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-22 02:21:31,311 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 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) Word has length 19 [2022-11-22 02:21:31,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:31,312 INFO L225 Difference]: With dead ends: 26 [2022-11-22 02:21:31,312 INFO L226 Difference]: Without dead ends: 26 [2022-11-22 02:21:31,313 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=287, Invalid=1519, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 02:21:31,313 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 99 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:31,314 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 14 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:21:31,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-22 02:21:31,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2022-11-22 02:21:31,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:21:31,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-11-22 02:21:31,317 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2022-11-22 02:21:31,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:31,317 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-11-22 02:21:31,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 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) [2022-11-22 02:21:31,318 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-11-22 02:21:31,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-22 02:21:31,319 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:31,319 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2022-11-22 02:21:31,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 02:21:31,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:31,523 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:31,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:31,524 INFO L85 PathProgramCache]: Analyzing trace with hash -1707427160, now seen corresponding path program 5 times [2022-11-22 02:21:31,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:31,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007100584] [2022-11-22 02:21:31,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:31,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:31,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:31,844 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:31,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:31,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007100584] [2022-11-22 02:21:31,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007100584] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:31,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741642534] [2022-11-22 02:21:31,845 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:21:31,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:31,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:31,846 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:31,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:21:32,121 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:21:32,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:21:32,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 02:21:32,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:32,236 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:32,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:32,478 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:32,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741642534] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:32,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1230641221] [2022-11-22 02:21:32,480 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:21:32,480 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:32,480 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:32,480 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:32,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:32,523 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 8 treesize of output 7 [2022-11-22 02:21:32,566 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 7 [2022-11-22 02:21:32,596 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 14 treesize of output 10 [2022-11-22 02:21:32,979 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:34,668 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1189#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:21:34,669 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:34,669 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:21:34,669 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2022-11-22 02:21:34,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562617403] [2022-11-22 02:21:34,670 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:34,670 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-22 02:21:34,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:34,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-22 02:21:34,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=783, Unknown=0, NotChecked=0, Total=870 [2022-11-22 02:21:34,671 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 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) [2022-11-22 02:21:34,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:34,952 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2022-11-22 02:21:34,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 02:21:34,953 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 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 23 [2022-11-22 02:21:34,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:34,953 INFO L225 Difference]: With dead ends: 40 [2022-11-22 02:21:34,953 INFO L226 Difference]: Without dead ends: 27 [2022-11-22 02:21:34,954 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=126, Invalid=1134, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 02:21:34,955 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 42 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:34,955 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 100 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:21:34,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-22 02:21:34,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2022-11-22 02:21:34,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 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) [2022-11-22 02:21:34,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-11-22 02:21:34,957 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 23 [2022-11-22 02:21:34,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:34,958 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-11-22 02:21:34,958 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 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) [2022-11-22 02:21:34,958 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-11-22 02:21:34,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-22 02:21:34,958 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:34,959 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1] [2022-11-22 02:21:34,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 02:21:35,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:35,163 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:35,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:35,164 INFO L85 PathProgramCache]: Analyzing trace with hash -1386321737, now seen corresponding path program 6 times [2022-11-22 02:21:35,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:35,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771159495] [2022-11-22 02:21:35,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:35,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:35,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:35,600 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 6 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:35,600 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:35,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771159495] [2022-11-22 02:21:35,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [771159495] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:35,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1445878261] [2022-11-22 02:21:35,601 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:21:35,601 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:35,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:35,603 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:35,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:21:35,702 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:21:35,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:21:35,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-22 02:21:35,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:35,715 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 02:21:35,830 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:35,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:36,248 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:36,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1445878261] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:36,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [963875681] [2022-11-22 02:21:36,250 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:21:36,250 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:36,251 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:36,251 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:36,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:36,288 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 8 treesize of output 7 [2022-11-22 02:21:36,324 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 7 [2022-11-22 02:21:36,366 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 14 treesize of output 10 [2022-11-22 02:21:36,784 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:38,317 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1447#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:21:38,317 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:38,318 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:21:38,318 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 26 [2022-11-22 02:21:38,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458609813] [2022-11-22 02:21:38,318 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:38,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-22 02:21:38,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:38,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-22 02:21:38,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1114, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 02:21:38,320 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 28 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 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) [2022-11-22 02:21:38,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:38,774 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2022-11-22 02:21:38,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 02:21:38,774 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 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) Word has length 25 [2022-11-22 02:21:38,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:38,775 INFO L225 Difference]: With dead ends: 32 [2022-11-22 02:21:38,775 INFO L226 Difference]: Without dead ends: 32 [2022-11-22 02:21:38,776 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=374, Invalid=1882, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 02:21:38,777 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 117 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:38,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [117 Valid, 24 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:21:38,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-22 02:21:38,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2022-11-22 02:21:38,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 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) [2022-11-22 02:21:38,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-11-22 02:21:38,780 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 25 [2022-11-22 02:21:38,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:38,781 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-11-22 02:21:38,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 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) [2022-11-22 02:21:38,781 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-11-22 02:21:38,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-22 02:21:38,782 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:38,782 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2022-11-22 02:21:38,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 02:21:38,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:38,988 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:38,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:38,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1845324697, now seen corresponding path program 7 times [2022-11-22 02:21:38,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:38,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036475263] [2022-11-22 02:21:38,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:38,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:39,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:39,296 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:39,296 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:39,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1036475263] [2022-11-22 02:21:39,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1036475263] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:39,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986125080] [2022-11-22 02:21:39,296 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:21:39,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:39,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:39,298 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:39,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 02:21:39,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:39,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 02:21:39,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:39,568 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:39,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:39,893 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:39,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986125080] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:39,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [894674534] [2022-11-22 02:21:39,897 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:21:39,897 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:39,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:39,897 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:39,898 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:39,913 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 8 treesize of output 7 [2022-11-22 02:21:39,945 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 14 treesize of output 10 [2022-11-22 02:21:39,987 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 14 treesize of output 10 [2022-11-22 02:21:40,357 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:42,051 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1735#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:21:42,051 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:42,052 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:21:42,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2022-11-22 02:21:42,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325539191] [2022-11-22 02:21:42,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:42,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-22 02:21:42,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:42,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-22 02:21:42,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2022-11-22 02:21:42,054 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 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) [2022-11-22 02:21:42,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:42,483 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2022-11-22 02:21:42,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-22 02:21:42,483 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-11-22 02:21:42,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:42,484 INFO L225 Difference]: With dead ends: 50 [2022-11-22 02:21:42,484 INFO L226 Difference]: Without dead ends: 33 [2022-11-22 02:21:42,485 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=148, Invalid=1574, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 02:21:42,485 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 37 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:42,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 178 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:21:42,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-22 02:21:42,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2022-11-22 02:21:42,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 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) [2022-11-22 02:21:42,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-11-22 02:21:42,489 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 29 [2022-11-22 02:21:42,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:42,490 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-11-22 02:21:42,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 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) [2022-11-22 02:21:42,490 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-11-22 02:21:42,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-22 02:21:42,491 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:42,491 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1] [2022-11-22 02:21:42,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 02:21:42,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 02:21:42,695 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:42,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:42,696 INFO L85 PathProgramCache]: Analyzing trace with hash 346635062, now seen corresponding path program 8 times [2022-11-22 02:21:42,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:42,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168607277] [2022-11-22 02:21:42,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:42,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:42,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:43,193 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:43,193 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:43,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168607277] [2022-11-22 02:21:43,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168607277] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:43,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478289267] [2022-11-22 02:21:43,193 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:21:43,194 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:43,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:43,196 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:43,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 02:21:43,481 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 02:21:43,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:21:43,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-22 02:21:43,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:43,496 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 02:21:44,702 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 8 proven. 37 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:21:44,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:46,340 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 4 proven. 41 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:21:46,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478289267] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:46,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2038813221] [2022-11-22 02:21:46,341 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:21:46,342 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:46,342 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:46,342 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:46,342 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:46,371 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 8 treesize of output 7 [2022-11-22 02:21:46,396 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 14 treesize of output 10 [2022-11-22 02:21:46,428 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 14 treesize of output 10 [2022-11-22 02:21:46,804 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:48,993 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2071#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:21:48,993 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:48,993 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:21:48,993 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 48 [2022-11-22 02:21:48,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009628610] [2022-11-22 02:21:48,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:48,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-22 02:21:48,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:48,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-22 02:21:48,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=3048, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 02:21:48,996 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 50 states, 49 states have (on average 1.6938775510204083) internal successors, (83), 49 states have internal predecessors, (83), 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) [2022-11-22 02:21:54,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:54,379 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2022-11-22 02:21:54,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-22 02:21:54,379 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.6938775510204083) internal successors, (83), 49 states have internal predecessors, (83), 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 31 [2022-11-22 02:21:54,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:54,379 INFO L225 Difference]: With dead ends: 53 [2022-11-22 02:21:54,379 INFO L226 Difference]: Without dead ends: 53 [2022-11-22 02:21:54,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1407 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=1313, Invalid=7617, Unknown=0, NotChecked=0, Total=8930 [2022-11-22 02:21:54,382 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 306 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 709 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 709 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:54,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [306 Valid, 51 Invalid, 774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 709 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 02:21:54,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-22 02:21:54,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2022-11-22 02:21:54,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 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) [2022-11-22 02:21:54,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-11-22 02:21:54,388 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 31 [2022-11-22 02:21:54,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:54,388 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-11-22 02:21:54,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.6938775510204083) internal successors, (83), 49 states have internal predecessors, (83), 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) [2022-11-22 02:21:54,389 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-11-22 02:21:54,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-22 02:21:54,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:54,390 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 5, 5, 1, 1, 1, 1] [2022-11-22 02:21:54,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 02:21:54,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:54,590 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:21:54,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:54,591 INFO L85 PathProgramCache]: Analyzing trace with hash 380989478, now seen corresponding path program 9 times [2022-11-22 02:21:54,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:54,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946229929] [2022-11-22 02:21:54,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:54,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:54,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:55,084 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 90 proven. 65 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 02:21:55,085 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:55,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946229929] [2022-11-22 02:21:55,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1946229929] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:21:55,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172115752] [2022-11-22 02:21:55,085 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:21:55,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:55,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:55,087 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:55,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 02:21:55,239 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:21:55,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:21:55,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 112 conjunts are in the unsatisfiable core [2022-11-22 02:21:55,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:55,253 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 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-22 02:21:56,131 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 88 proven. 75 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-22 02:21:56,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:57,627 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:21:57,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172115752] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:57,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1487549347] [2022-11-22 02:21:57,629 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:21:57,629 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:57,629 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:57,629 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:57,630 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:57,656 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 8 treesize of output 7 [2022-11-22 02:21:57,679 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 7 [2022-11-22 02:21:57,719 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 14 treesize of output 10 [2022-11-22 02:21:58,074 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:22:00,132 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2608#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:22:00,133 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:22:00,133 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:22:00,133 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 20] total 49 [2022-11-22 02:22:00,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2181286] [2022-11-22 02:22:00,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:22:00,134 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-22 02:22:00,134 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:00,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-22 02:22:00,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=3095, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 02:22:00,136 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 50 states, 50 states have (on average 2.48) internal successors, (124), 49 states have internal predecessors, (124), 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) [2022-11-22 02:22:08,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:08,569 INFO L93 Difference]: Finished difference Result 129 states and 135 transitions. [2022-11-22 02:22:08,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-22 02:22:08,570 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.48) internal successors, (124), 49 states have internal predecessors, (124), 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 51 [2022-11-22 02:22:08,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:08,571 INFO L225 Difference]: With dead ends: 129 [2022-11-22 02:22:08,571 INFO L226 Difference]: Without dead ends: 108 [2022-11-22 02:22:08,574 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2101 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=1125, Invalid=9381, Unknown=0, NotChecked=0, Total=10506 [2022-11-22 02:22:08,575 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 241 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 1237 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 1297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 1237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:08,575 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 194 Invalid, 1297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 1237 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 02:22:08,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-11-22 02:22:08,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 69. [2022-11-22 02:22:08,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 68 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:22:08,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 75 transitions. [2022-11-22 02:22:08,583 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 75 transitions. Word has length 51 [2022-11-22 02:22:08,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:08,583 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 75 transitions. [2022-11-22 02:22:08,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.48) internal successors, (124), 49 states have internal predecessors, (124), 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) [2022-11-22 02:22:08,584 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 75 transitions. [2022-11-22 02:22:08,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-22 02:22:08,585 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:08,585 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 6, 6, 1, 1, 1, 1] [2022-11-22 02:22:08,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:08,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-22 02:22:08,792 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:22:08,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:08,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1604943435, now seen corresponding path program 10 times [2022-11-22 02:22:08,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:08,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81865135] [2022-11-22 02:22:08,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:08,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:08,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:09,266 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 84 proven. 96 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 02:22:09,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:09,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81865135] [2022-11-22 02:22:09,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81865135] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:22:09,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051885057] [2022-11-22 02:22:09,267 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:22:09,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:09,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:09,271 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:09,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 02:22:09,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:09,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-22 02:22:09,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:09,414 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 02:22:10,051 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 144 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:22:10,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:10,796 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 144 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:22:10,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051885057] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:22:10,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1073466981] [2022-11-22 02:22:10,798 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:22:10,798 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:22:10,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:22:10,799 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:22:10,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:22:10,833 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 8 treesize of output 7 [2022-11-22 02:22:10,853 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 7 [2022-11-22 02:22:10,883 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 14 treesize of output 10 [2022-11-22 02:22:11,249 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:22:13,300 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3267#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:22:13,301 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:22:13,301 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:22:13,301 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 18] total 50 [2022-11-22 02:22:13,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070931961] [2022-11-22 02:22:13,301 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:22:13,301 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-22 02:22:13,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:13,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-22 02:22:13,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=3177, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 02:22:13,303 INFO L87 Difference]: Start difference. First operand 69 states and 75 transitions. Second operand has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 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) [2022-11-22 02:22:15,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:15,907 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2022-11-22 02:22:15,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 02:22:15,911 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 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 53 [2022-11-22 02:22:15,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:15,912 INFO L225 Difference]: With dead ends: 94 [2022-11-22 02:22:15,912 INFO L226 Difference]: Without dead ends: 69 [2022-11-22 02:22:15,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1407 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=656, Invalid=5664, Unknown=0, NotChecked=0, Total=6320 [2022-11-22 02:22:15,915 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 163 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 947 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 977 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 947 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:15,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 128 Invalid, 977 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 947 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:22:15,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-22 02:22:15,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-11-22 02:22:15,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.088235294117647) internal successors, (74), 68 states have internal predecessors, (74), 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) [2022-11-22 02:22:15,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2022-11-22 02:22:15,920 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 53 [2022-11-22 02:22:15,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:15,920 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2022-11-22 02:22:15,920 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 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) [2022-11-22 02:22:15,921 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2022-11-22 02:22:15,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-22 02:22:15,922 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:15,922 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 7, 7, 1, 1, 1, 1] [2022-11-22 02:22:15,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:16,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 02:22:16,128 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:22:16,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:16,129 INFO L85 PathProgramCache]: Analyzing trace with hash 1173973892, now seen corresponding path program 11 times [2022-11-22 02:22:16,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:16,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598151389] [2022-11-22 02:22:16,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:16,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:16,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:16,695 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 70 proven. 133 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-22 02:22:16,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:16,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598151389] [2022-11-22 02:22:16,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [598151389] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:22:16,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061946618] [2022-11-22 02:22:16,696 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:22:16,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:16,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:16,697 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:16,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 02:22:17,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-22 02:22:17,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:22:17,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 90 conjunts are in the unsatisfiable core [2022-11-22 02:22:17,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:17,339 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 02:22:18,316 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 154 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:18,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:19,312 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 154 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:19,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061946618] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:22:19,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [739396626] [2022-11-22 02:22:19,314 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:22:19,314 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:22:19,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:22:19,314 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:22:19,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:22:19,334 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 8 treesize of output 7 [2022-11-22 02:22:19,372 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 14 treesize of output 10 [2022-11-22 02:22:19,400 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 14 treesize of output 10 [2022-11-22 02:22:19,732 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:22:21,744 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3863#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:22:21,745 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:22:21,745 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:22:21,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 21, 21] total 58 [2022-11-22 02:22:21,745 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671074730] [2022-11-22 02:22:21,745 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:22:21,746 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-22 02:22:21,746 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:21,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-22 02:22:21,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=4063, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 02:22:21,748 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand has 59 states, 59 states have (on average 2.5762711864406778) internal successors, (152), 58 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:22:24,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:24,565 INFO L93 Difference]: Finished difference Result 133 states and 136 transitions. [2022-11-22 02:22:24,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-22 02:22:24,565 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.5762711864406778) internal successors, (152), 58 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2022-11-22 02:22:24,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:24,566 INFO L225 Difference]: With dead ends: 133 [2022-11-22 02:22:24,566 INFO L226 Difference]: Without dead ends: 69 [2022-11-22 02:22:24,568 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2006 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=1191, Invalid=8121, Unknown=0, NotChecked=0, Total=9312 [2022-11-22 02:22:24,569 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 171 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 1326 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 1350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:24,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 219 Invalid, 1350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1326 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 02:22:24,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-22 02:22:24,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-11-22 02:22:24,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 68 states have internal predecessors, (72), 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) [2022-11-22 02:22:24,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2022-11-22 02:22:24,574 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 55 [2022-11-22 02:22:24,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:24,574 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2022-11-22 02:22:24,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.5762711864406778) internal successors, (152), 58 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:22:24,575 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2022-11-22 02:22:24,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-22 02:22:24,576 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:24,576 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 1, 1, 1, 1] [2022-11-22 02:22:24,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:24,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-22 02:22:24,783 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:22:24,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:24,783 INFO L85 PathProgramCache]: Analyzing trace with hash -235632670, now seen corresponding path program 12 times [2022-11-22 02:22:24,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:24,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919648348] [2022-11-22 02:22:24,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:24,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:24,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:25,585 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:25,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:25,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919648348] [2022-11-22 02:22:25,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919648348] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:22:25,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659207943] [2022-11-22 02:22:25,586 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:22:25,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:25,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:25,587 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:25,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 02:22:25,810 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:22:25,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:22:25,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-22 02:22:25,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:26,063 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:26,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:27,074 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:27,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659207943] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:22:27,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1027937987] [2022-11-22 02:22:27,079 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:22:27,079 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:22:27,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:22:27,079 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:22:27,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:22:27,109 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 8 treesize of output 7 [2022-11-22 02:22:27,141 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 14 treesize of output 10 [2022-11-22 02:22:27,173 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 14 treesize of output 10 [2022-11-22 02:22:27,533 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:22:29,487 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4527#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:22:29,487 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:22:29,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:22:29,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 45 [2022-11-22 02:22:29,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419328007] [2022-11-22 02:22:29,488 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:22:29,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-22 02:22:29,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:29,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-22 02:22:29,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2715, Unknown=0, NotChecked=0, Total=2862 [2022-11-22 02:22:29,490 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 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) [2022-11-22 02:22:30,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:30,755 INFO L93 Difference]: Finished difference Result 106 states and 108 transitions. [2022-11-22 02:22:30,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-22 02:22:30,756 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 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 59 [2022-11-22 02:22:30,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:30,756 INFO L225 Difference]: With dead ends: 106 [2022-11-22 02:22:30,756 INFO L226 Difference]: Without dead ends: 69 [2022-11-22 02:22:30,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=258, Invalid=4854, Unknown=0, NotChecked=0, Total=5112 [2022-11-22 02:22:30,758 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 115 mSDsluCounter, 747 mSDsCounter, 0 mSdLazyCounter, 921 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 774 SdHoareTripleChecker+Invalid, 933 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 921 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:30,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 774 Invalid, 933 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 921 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:22:30,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-22 02:22:30,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-11-22 02:22:30,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 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) [2022-11-22 02:22:30,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-11-22 02:22:30,762 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 59 [2022-11-22 02:22:30,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:30,762 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-11-22 02:22:30,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 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) [2022-11-22 02:22:30,762 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-11-22 02:22:30,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-22 02:22:30,763 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:30,764 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 9, 9, 9, 1, 1, 1, 1] [2022-11-22 02:22:30,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:30,969 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 02:22:30,969 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:22:30,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:30,970 INFO L85 PathProgramCache]: Analyzing trace with hash -1204927168, now seen corresponding path program 13 times [2022-11-22 02:22:30,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:30,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626143635] [2022-11-22 02:22:30,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:30,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:31,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:32,288 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 90 proven. 193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:32,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:32,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626143635] [2022-11-22 02:22:32,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626143635] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:22:32,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645317809] [2022-11-22 02:22:32,289 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:22:32,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:32,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:32,290 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:32,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 02:22:32,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:32,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-22 02:22:32,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:32,693 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 110 proven. 173 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:32,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:33,392 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 7 treesize of output 5 [2022-11-22 02:22:33,521 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 110 proven. 173 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:33,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645317809] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:22:33,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1719061764] [2022-11-22 02:22:33,523 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:22:33,523 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:22:33,523 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:22:33,524 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:22:33,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:22:33,547 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 8 treesize of output 7 [2022-11-22 02:22:33,570 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 7 [2022-11-22 02:22:33,599 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 14 treesize of output 10 [2022-11-22 02:22:33,949 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:22:35,909 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5162#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:22:35,910 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:22:35,910 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:22:35,910 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 42 [2022-11-22 02:22:35,910 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515113024] [2022-11-22 02:22:35,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:22:35,911 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-22 02:22:35,911 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:35,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-22 02:22:35,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=2385, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 02:22:35,912 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 44 states, 43 states have (on average 2.604651162790698) internal successors, (112), 43 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:22:38,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:38,546 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2022-11-22 02:22:38,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-22 02:22:38,547 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 2.604651162790698) internal successors, (112), 43 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2022-11-22 02:22:38,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:38,548 INFO L225 Difference]: With dead ends: 117 [2022-11-22 02:22:38,548 INFO L226 Difference]: Without dead ends: 117 [2022-11-22 02:22:38,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 152 SyntacticMatches, 10 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2013 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=1646, Invalid=8254, Unknown=0, NotChecked=0, Total=9900 [2022-11-22 02:22:38,550 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 287 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 1330 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 1353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:38,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 212 Invalid, 1353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1330 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 02:22:38,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2022-11-22 02:22:38,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 73. [2022-11-22 02:22:38,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:22:38,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2022-11-22 02:22:38,554 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 63 [2022-11-22 02:22:38,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:38,555 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2022-11-22 02:22:38,555 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 2.604651162790698) internal successors, (112), 43 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:22:38,555 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2022-11-22 02:22:38,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-22 02:22:38,556 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:38,556 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 1, 1, 1, 1] [2022-11-22 02:22:38,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:38,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:38,767 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:22:38,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:38,768 INFO L85 PathProgramCache]: Analyzing trace with hash 1636784417, now seen corresponding path program 14 times [2022-11-22 02:22:38,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:38,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962435271] [2022-11-22 02:22:38,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:38,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:38,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:39,588 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:39,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:39,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962435271] [2022-11-22 02:22:39,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962435271] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:22:39,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2127126840] [2022-11-22 02:22:39,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:22:39,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:39,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:39,589 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:39,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 02:22:40,260 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-22 02:22:40,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:22:40,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-22 02:22:40,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:40,491 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:40,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:41,498 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:41,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2127126840] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:22:41,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1553579257] [2022-11-22 02:22:41,500 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:22:41,500 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:22:41,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:22:41,511 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:22:41,512 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:22:41,534 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 8 treesize of output 7 [2022-11-22 02:22:41,559 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 14 treesize of output 10 [2022-11-22 02:22:41,588 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 14 treesize of output 10 [2022-11-22 02:22:41,909 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:22:43,966 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5890#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:22:43,966 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:22:43,966 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:22:43,966 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2022-11-22 02:22:43,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034295910] [2022-11-22 02:22:43,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:22:43,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-22 02:22:43,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:43,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-22 02:22:43,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=3149, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 02:22:43,968 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 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) [2022-11-22 02:22:45,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:45,527 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2022-11-22 02:22:45,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-22 02:22:45,528 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 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 65 [2022-11-22 02:22:45,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:45,528 INFO L225 Difference]: With dead ends: 114 [2022-11-22 02:22:45,528 INFO L226 Difference]: Without dead ends: 73 [2022-11-22 02:22:45,529 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 160 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=280, Invalid=5726, Unknown=0, NotChecked=0, Total=6006 [2022-11-22 02:22:45,529 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 84 mSDsluCounter, 1065 mSDsCounter, 0 mSdLazyCounter, 1275 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 1095 SdHoareTripleChecker+Invalid, 1287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:45,529 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 1095 Invalid, 1287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1275 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 02:22:45,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-22 02:22:45,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2022-11-22 02:22:45,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 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) [2022-11-22 02:22:45,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-11-22 02:22:45,533 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 65 [2022-11-22 02:22:45,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:45,533 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-11-22 02:22:45,533 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 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) [2022-11-22 02:22:45,534 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-11-22 02:22:45,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-22 02:22:45,535 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:45,535 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 1, 1, 1, 1] [2022-11-22 02:22:45,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:45,743 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:45,743 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:22:45,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:45,744 INFO L85 PathProgramCache]: Analyzing trace with hash -534991968, now seen corresponding path program 15 times [2022-11-22 02:22:45,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:45,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662119971] [2022-11-22 02:22:45,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:45,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:45,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:46,627 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:46,628 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:46,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662119971] [2022-11-22 02:22:46,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [662119971] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:22:46,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355070671] [2022-11-22 02:22:46,628 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:22:46,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:46,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:46,630 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:46,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 02:22:46,843 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:22:46,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:22:46,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-22 02:22:46,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:47,132 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:47,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:48,407 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:48,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355070671] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:22:48,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [626456359] [2022-11-22 02:22:48,409 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:22:48,409 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:22:48,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:22:48,410 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:22:48,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:22:48,430 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 8 treesize of output 7 [2022-11-22 02:22:48,469 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 14 treesize of output 10 [2022-11-22 02:22:48,497 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 14 treesize of output 10 [2022-11-22 02:22:48,796 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:22:50,934 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6598#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:22:50,935 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:22:50,935 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:22:50,935 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 53 [2022-11-22 02:22:50,935 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257917776] [2022-11-22 02:22:50,935 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:22:50,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-22 02:22:50,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:50,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-22 02:22:50,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3615, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 02:22:50,936 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 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) [2022-11-22 02:22:52,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:52,821 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2022-11-22 02:22:52,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-22 02:22:52,822 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 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 71 [2022-11-22 02:22:52,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:52,822 INFO L225 Difference]: With dead ends: 120 [2022-11-22 02:22:52,822 INFO L226 Difference]: Without dead ends: 75 [2022-11-22 02:22:52,823 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 176 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1054 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=302, Invalid=6670, Unknown=0, NotChecked=0, Total=6972 [2022-11-22 02:22:52,824 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 93 mSDsluCounter, 1098 mSDsCounter, 0 mSdLazyCounter, 1354 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 1131 SdHoareTripleChecker+Invalid, 1367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:52,825 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 1131 Invalid, 1367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1354 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:22:52,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-22 02:22:52,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2022-11-22 02:22:52,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:22:52,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2022-11-22 02:22:52,828 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 71 [2022-11-22 02:22:52,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:52,829 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2022-11-22 02:22:52,829 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 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) [2022-11-22 02:22:52,829 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2022-11-22 02:22:52,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-22 02:22:52,830 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:52,830 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 1, 1, 1, 1] [2022-11-22 02:22:52,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:53,038 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:53,038 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:22:53,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:53,038 INFO L85 PathProgramCache]: Analyzing trace with hash -2130944081, now seen corresponding path program 16 times [2022-11-22 02:22:53,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:53,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306315741] [2022-11-22 02:22:53,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:53,039 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:53,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:54,405 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 110 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:54,405 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:54,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306315741] [2022-11-22 02:22:54,406 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1306315741] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:22:54,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929397525] [2022-11-22 02:22:54,406 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:22:54,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:54,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:54,407 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:54,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 02:22:54,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:54,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 117 conjunts are in the unsatisfiable core [2022-11-22 02:22:54,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:54,834 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 132 proven. 254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:54,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:55,603 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 7 treesize of output 5 [2022-11-22 02:22:55,743 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 132 proven. 254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:22:55,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929397525] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:22:55,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [453025338] [2022-11-22 02:22:55,744 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:22:55,745 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:22:55,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:22:55,745 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:22:55,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:22:55,760 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 8 treesize of output 7 [2022-11-22 02:22:55,801 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 7 [2022-11-22 02:22:55,835 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 14 treesize of output 10 [2022-11-22 02:22:56,154 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:22:58,157 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7324#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:22:58,157 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:22:58,157 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:22:58,157 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 46 [2022-11-22 02:22:58,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389936564] [2022-11-22 02:22:58,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:22:58,158 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-22 02:22:58,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:58,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-22 02:22:58,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=2805, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 02:22:58,159 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 48 states, 47 states have (on average 2.702127659574468) internal successors, (127), 47 states have internal predecessors, (127), 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) [2022-11-22 02:22:59,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:59,715 INFO L93 Difference]: Finished difference Result 80 states and 81 transitions. [2022-11-22 02:22:59,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-22 02:22:59,716 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 2.702127659574468) internal successors, (127), 47 states have internal predecessors, (127), 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 73 [2022-11-22 02:22:59,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:59,717 INFO L225 Difference]: With dead ends: 80 [2022-11-22 02:22:59,717 INFO L226 Difference]: Without dead ends: 80 [2022-11-22 02:22:59,717 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 179 SyntacticMatches, 12 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1369 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1031, Invalid=5941, Unknown=0, NotChecked=0, Total=6972 [2022-11-22 02:22:59,718 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 285 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 1307 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 1322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:59,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [285 Valid, 189 Invalid, 1322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1307 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:22:59,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-22 02:22:59,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2022-11-22 02:22:59,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 states have internal predecessors, (79), 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) [2022-11-22 02:22:59,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2022-11-22 02:22:59,721 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 73 [2022-11-22 02:22:59,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:59,722 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2022-11-22 02:22:59,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 2.702127659574468) internal successors, (127), 47 states have internal predecessors, (127), 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) [2022-11-22 02:22:59,722 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2022-11-22 02:22:59,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-22 02:22:59,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:59,723 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 1, 1, 1, 1] [2022-11-22 02:22:59,731 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-11-22 02:22:59,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-22 02:22:59,929 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:22:59,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:59,929 INFO L85 PathProgramCache]: Analyzing trace with hash -413380769, now seen corresponding path program 17 times [2022-11-22 02:22:59,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:59,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173740042] [2022-11-22 02:22:59,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:59,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:59,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:23:01,047 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 24 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:23:01,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:23:01,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173740042] [2022-11-22 02:23:01,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [173740042] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:23:01,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410779057] [2022-11-22 02:23:01,048 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:23:01,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:23:01,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:23:01,049 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:23:01,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 02:23:02,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-22 02:23:02,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:23:02,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-22 02:23:02,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:23:02,647 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 24 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:23:02,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:23:04,961 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 28 proven. 404 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:23:04,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410779057] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:23:04,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [279259915] [2022-11-22 02:23:04,962 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:23:04,963 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:23:04,963 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:23:04,963 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:23:04,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:23:04,988 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 8 treesize of output 7 [2022-11-22 02:23:05,010 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 14 treesize of output 10 [2022-11-22 02:23:05,044 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 14 treesize of output 10 [2022-11-22 02:23:05,353 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:23:07,648 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8063#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:23:07,648 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:23:07,648 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:23:07,648 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 60 [2022-11-22 02:23:07,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739489841] [2022-11-22 02:23:07,649 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:23:07,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-22 02:23:07,649 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:23:07,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-22 02:23:07,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=4475, Unknown=0, NotChecked=0, Total=4692 [2022-11-22 02:23:07,656 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 61 states, 61 states have (on average 2.6065573770491803) internal successors, (159), 60 states have internal predecessors, (159), 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) [2022-11-22 02:23:10,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:23:10,589 INFO L93 Difference]: Finished difference Result 130 states and 131 transitions. [2022-11-22 02:23:10,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-22 02:23:10,589 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.6065573770491803) internal successors, (159), 60 states have internal predecessors, (159), 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 [2022-11-22 02:23:10,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:23:10,590 INFO L225 Difference]: With dead ends: 130 [2022-11-22 02:23:10,590 INFO L226 Difference]: Without dead ends: 81 [2022-11-22 02:23:10,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=421, Invalid=8509, Unknown=0, NotChecked=0, Total=8930 [2022-11-22 02:23:10,591 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 155 mSDsluCounter, 1025 mSDsCounter, 0 mSdLazyCounter, 1339 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 1060 SdHoareTripleChecker+Invalid, 1358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:23:10,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 1060 Invalid, 1358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1339 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-22 02:23:10,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-22 02:23:10,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2022-11-22 02:23:10,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 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) [2022-11-22 02:23:10,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-11-22 02:23:10,595 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 77 [2022-11-22 02:23:10,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:23:10,595 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-11-22 02:23:10,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.6065573770491803) internal successors, (159), 60 states have internal predecessors, (159), 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) [2022-11-22 02:23:10,596 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-11-22 02:23:10,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-22 02:23:10,596 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:23:10,597 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 1, 1, 1, 1] [2022-11-22 02:23:10,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-22 02:23:10,803 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-22 02:23:10,803 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:23:10,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:23:10,804 INFO L85 PathProgramCache]: Analyzing trace with hash 539130926, now seen corresponding path program 18 times [2022-11-22 02:23:10,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:23:10,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689634503] [2022-11-22 02:23:10,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:23:10,804 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:23:10,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:23:12,278 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 132 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:23:12,278 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:23:12,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689634503] [2022-11-22 02:23:12,279 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689634503] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:23:12,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058071556] [2022-11-22 02:23:12,279 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:23:12,279 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:23:12,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:23:12,288 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:23:12,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 02:23:12,638 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:23:12,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:23:12,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 132 conjunts are in the unsatisfiable core [2022-11-22 02:23:12,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:23:12,654 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 02:23:13,620 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 156 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:23:13,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:23:15,537 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 169 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:23:15,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058071556] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:23:15,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [574380603] [2022-11-22 02:23:15,539 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:23:15,540 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:23:15,540 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:23:15,540 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:23:15,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:23:15,567 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 8 treesize of output 7 [2022-11-22 02:23:15,592 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 7 [2022-11-22 02:23:15,621 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 14 treesize of output 10 [2022-11-22 02:23:15,931 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:23:18,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8878#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:23:18,360 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:23:18,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:23:18,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 75 [2022-11-22 02:23:18,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116548144] [2022-11-22 02:23:18,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:23:18,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2022-11-22 02:23:18,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:23:18,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2022-11-22 02:23:18,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=728, Invalid=6412, Unknown=0, NotChecked=0, Total=7140 [2022-11-22 02:23:18,362 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 77 states, 76 states have (on average 2.486842105263158) internal successors, (189), 76 states have internal predecessors, (189), 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) [2022-11-22 02:23:20,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:23:20,320 INFO L93 Difference]: Finished difference Result 86 states and 87 transitions. [2022-11-22 02:23:20,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-22 02:23:20,320 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 2.486842105263158) internal successors, (189), 76 states have internal predecessors, (189), 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 79 [2022-11-22 02:23:20,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:23:20,321 INFO L225 Difference]: With dead ends: 86 [2022-11-22 02:23:20,321 INFO L226 Difference]: Without dead ends: 86 [2022-11-22 02:23:20,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2635 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=2355, Invalid=10755, Unknown=0, NotChecked=0, Total=13110 [2022-11-22 02:23:20,323 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 826 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 1560 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 826 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 1578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:23:20,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [826 Valid, 225 Invalid, 1578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1560 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:23:20,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-22 02:23:20,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2022-11-22 02:23:20,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 states have internal predecessors, (85), 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) [2022-11-22 02:23:20,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2022-11-22 02:23:20,326 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 79 [2022-11-22 02:23:20,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:23:20,326 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2022-11-22 02:23:20,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 76 states have (on average 2.486842105263158) internal successors, (189), 76 states have internal predecessors, (189), 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) [2022-11-22 02:23:20,327 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2022-11-22 02:23:20,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-22 02:23:20,327 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:23:20,328 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 1, 1, 1, 1] [2022-11-22 02:23:20,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-22 02:23:20,528 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-22 02:23:20,528 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:23:20,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:23:20,529 INFO L85 PathProgramCache]: Analyzing trace with hash 353506398, now seen corresponding path program 19 times [2022-11-22 02:23:20,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:23:20,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412331929] [2022-11-22 02:23:20,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:23:20,529 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:23:20,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:23:21,602 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 26 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:23:21,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:23:21,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412331929] [2022-11-22 02:23:21,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412331929] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:23:21,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103503104] [2022-11-22 02:23:21,603 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:23:21,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:23:21,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:23:21,604 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:23:21,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 02:23:21,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:23:21,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 496 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-22 02:23:21,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:23:22,167 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 26 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:23:22,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:23:23,861 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 26 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:23:23,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103503104] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:23:23,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1511157787] [2022-11-22 02:23:23,862 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:23:23,863 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:23:23,863 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:23:23,863 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:23:23,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:23:23,883 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 8 treesize of output 7 [2022-11-22 02:23:23,909 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 14 treesize of output 10 [2022-11-22 02:23:23,939 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 14 treesize of output 10 [2022-11-22 02:23:24,281 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:23:26,567 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9670#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:23:26,567 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:23:26,567 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:23:26,567 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2022-11-22 02:23:26,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811022658] [2022-11-22 02:23:26,568 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:23:26,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-22 02:23:26,568 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:23:26,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-22 02:23:26,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=4643, Unknown=0, NotChecked=0, Total=4830 [2022-11-22 02:23:26,569 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 62 states, 62 states have (on average 2.7096774193548385) internal successors, (168), 61 states have internal predecessors, (168), 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) [2022-11-22 02:23:28,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:23:28,927 INFO L93 Difference]: Finished difference Result 140 states and 141 transitions. [2022-11-22 02:23:28,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-22 02:23:28,927 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.7096774193548385) internal successors, (168), 61 states have internal predecessors, (168), 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 83 [2022-11-22 02:23:28,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:23:28,928 INFO L225 Difference]: With dead ends: 140 [2022-11-22 02:23:28,928 INFO L226 Difference]: Without dead ends: 87 [2022-11-22 02:23:28,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 208 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1334 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=346, Invalid=8774, Unknown=0, NotChecked=0, Total=9120 [2022-11-22 02:23:28,932 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 110 mSDsluCounter, 1493 mSDsCounter, 0 mSdLazyCounter, 1788 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 1532 SdHoareTripleChecker+Invalid, 1804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1788 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:23:28,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 1532 Invalid, 1804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1788 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-22 02:23:28,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-22 02:23:28,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2022-11-22 02:23:28,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 states have internal predecessors, (87), 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) [2022-11-22 02:23:28,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2022-11-22 02:23:28,944 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 83 [2022-11-22 02:23:28,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:23:28,944 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2022-11-22 02:23:28,944 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.7096774193548385) internal successors, (168), 61 states have internal predecessors, (168), 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) [2022-11-22 02:23:28,944 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2022-11-22 02:23:28,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-22 02:23:28,948 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:23:28,949 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 1, 1, 1, 1] [2022-11-22 02:23:28,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-22 02:23:29,149 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:23:29,149 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:23:29,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:23:29,150 INFO L85 PathProgramCache]: Analyzing trace with hash 2041653741, now seen corresponding path program 20 times [2022-11-22 02:23:29,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:23:29,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649778892] [2022-11-22 02:23:29,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:23:29,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:23:29,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:23:30,893 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 156 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:23:30,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:23:30,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649778892] [2022-11-22 02:23:30,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649778892] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:23:30,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534591259] [2022-11-22 02:23:30,893 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:23:30,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:23:30,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:23:30,895 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:23:30,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-22 02:23:32,303 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-22 02:23:32,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:23:32,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 496 conjuncts, 176 conjunts are in the unsatisfiable core [2022-11-22 02:23:32,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:23:32,325 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 02:23:36,593 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 86 proven. 348 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-22 02:23:36,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:23:43,453 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 10 proven. 424 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-22 02:23:43,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534591259] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:23:43,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [637264722] [2022-11-22 02:23:43,455 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:23:43,455 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:23:43,456 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:23:43,456 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:23:43,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:23:43,492 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 8 treesize of output 7 [2022-11-22 02:23:43,518 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 7 [2022-11-22 02:23:43,551 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 14 treesize of output 10 [2022-11-22 02:23:43,951 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:23:47,350 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10572#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:23:47,350 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:23:47,350 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:23:47,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 39, 39] total 110 [2022-11-22 02:23:47,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643317415] [2022-11-22 02:23:47,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:23:47,351 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2022-11-22 02:23:47,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:23:47,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2022-11-22 02:23:47,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=13150, Unknown=0, NotChecked=0, Total=14280 [2022-11-22 02:23:47,353 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 112 states, 111 states have (on average 1.972972972972973) internal successors, (219), 111 states have internal predecessors, (219), 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) [2022-11-22 02:24:19,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:24:19,488 INFO L93 Difference]: Finished difference Result 143 states and 144 transitions. [2022-11-22 02:24:19,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-11-22 02:24:19,488 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 111 states have (on average 1.972972972972973) internal successors, (219), 111 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2022-11-22 02:24:19,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:24:19,490 INFO L225 Difference]: With dead ends: 143 [2022-11-22 02:24:19,490 INFO L226 Difference]: Without dead ends: 143 [2022-11-22 02:24:19,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7259 ImplicationChecksByTransitivity, 42.7s TimeCoverageRelationStatistics Valid=7348, Invalid=39092, Unknown=0, NotChecked=0, Total=46440 [2022-11-22 02:24:19,492 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1360 mSDsluCounter, 438 mSDsCounter, 0 mSdLazyCounter, 2964 mSolverCounterSat, 358 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1360 SdHoareTripleChecker+Valid, 450 SdHoareTripleChecker+Invalid, 3322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 358 IncrementalHoareTripleChecker+Valid, 2964 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:24:19,492 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1360 Valid, 450 Invalid, 3322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [358 Valid, 2964 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-22 02:24:19,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-11-22 02:24:19,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2022-11-22 02:24:19,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.0141843971631206) internal successors, (143), 141 states have internal predecessors, (143), 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) [2022-11-22 02:24:19,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2022-11-22 02:24:19,496 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 85 [2022-11-22 02:24:19,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:24:19,497 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2022-11-22 02:24:19,497 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 111 states have (on average 1.972972972972973) internal successors, (219), 111 states have internal predecessors, (219), 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) [2022-11-22 02:24:19,497 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2022-11-22 02:24:19,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-11-22 02:24:19,498 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:24:19,498 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 27, 14, 14, 1, 1, 1, 1] [2022-11-22 02:24:19,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-22 02:24:19,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-22 02:24:19,707 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:24:19,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:24:19,707 INFO L85 PathProgramCache]: Analyzing trace with hash 1896885133, now seen corresponding path program 21 times [2022-11-22 02:24:19,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:24:19,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982619429] [2022-11-22 02:24:19,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:24:19,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:24:19,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:24:21,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 756 proven. 560 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2022-11-22 02:24:21,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:24:21,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982619429] [2022-11-22 02:24:21,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1982619429] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:24:21,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278139824] [2022-11-22 02:24:21,547 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:24:21,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:24:21,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:24:21,548 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:24:21,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-22 02:24:21,993 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:24:21,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:24:22,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 789 conjuncts, 210 conjunts are in the unsatisfiable core [2022-11-22 02:24:22,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:24:22,016 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 02:24:25,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 1432 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:24:25,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:24:28,972 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 1432 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:24:28,972 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278139824] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:24:28,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1626679241] [2022-11-22 02:24:28,974 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:24:28,974 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:24:28,974 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:24:28,975 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:24:28,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:24:28,999 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 8 treesize of output 7 [2022-11-22 02:24:29,036 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 14 treesize of output 10 [2022-11-22 02:24:29,070 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 14 treesize of output 10 [2022-11-22 02:24:29,436 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:24:32,621 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12020#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:24:32,621 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:24:32,621 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:24:32,621 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 46, 46] total 122 [2022-11-22 02:24:32,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380300734] [2022-11-22 02:24:32,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:24:32,622 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-22 02:24:32,622 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:24:32,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-22 02:24:32,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1860, Invalid=15170, Unknown=0, NotChecked=0, Total=17030 [2022-11-22 02:24:32,625 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 123 states, 123 states have (on average 2.975609756097561) internal successors, (366), 122 states have internal predecessors, (366), 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) [2022-11-22 02:24:46,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:24:46,810 INFO L93 Difference]: Finished difference Result 332 states and 344 transitions. [2022-11-22 02:24:46,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-11-22 02:24:46,811 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 2.975609756097561) internal successors, (366), 122 states have internal predecessors, (366), 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 141 [2022-11-22 02:24:46,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:24:46,812 INFO L225 Difference]: With dead ends: 332 [2022-11-22 02:24:46,812 INFO L226 Difference]: Without dead ends: 168 [2022-11-22 02:24:46,814 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11289 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=6654, Invalid=39356, Unknown=0, NotChecked=0, Total=46010 [2022-11-22 02:24:46,814 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 564 mSDsluCounter, 771 mSDsCounter, 0 mSdLazyCounter, 4078 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 785 SdHoareTripleChecker+Invalid, 4267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 4078 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:24:46,814 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 785 Invalid, 4267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 4078 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-22 02:24:46,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-22 02:24:46,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-22 02:24:46,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 167 states have (on average 1.0119760479041917) internal successors, (169), 167 states have internal predecessors, (169), 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) [2022-11-22 02:24:46,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2022-11-22 02:24:46,819 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 141 [2022-11-22 02:24:46,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:24:46,820 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2022-11-22 02:24:46,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 2.975609756097561) internal successors, (366), 122 states have internal predecessors, (366), 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) [2022-11-22 02:24:46,820 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2022-11-22 02:24:46,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2022-11-22 02:24:46,821 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:24:46,821 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 1, 1, 1, 1] [2022-11-22 02:24:46,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-22 02:24:47,029 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-22 02:24:47,030 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:24:47,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:24:47,030 INFO L85 PathProgramCache]: Analyzing trace with hash -453149296, now seen corresponding path program 22 times [2022-11-22 02:24:47,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:24:47,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460162600] [2022-11-22 02:24:47,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:24:47,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:24:47,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:24:50,738 INFO L134 CoverageAnalysis]: Checked inductivity of 2187 backedges. 54 proven. 2133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:24:50,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:24:50,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [460162600] [2022-11-22 02:24:50,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [460162600] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:24:50,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782998951] [2022-11-22 02:24:50,738 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:24:50,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:24:50,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:24:50,739 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:24:50,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-22 02:24:51,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:24:51,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 958 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-22 02:24:51,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:24:51,940 INFO L134 CoverageAnalysis]: Checked inductivity of 2187 backedges. 54 proven. 2133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:24:51,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:24:57,712 INFO L134 CoverageAnalysis]: Checked inductivity of 2187 backedges. 54 proven. 2133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:24:57,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [782998951] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:24:57,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [176033463] [2022-11-22 02:24:57,714 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:24:57,714 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:24:57,714 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:24:57,715 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:24:57,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:24:57,731 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 8 treesize of output 7 [2022-11-22 02:24:57,779 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 14 treesize of output 10 [2022-11-22 02:24:57,813 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 14 treesize of output 10 [2022-11-22 02:24:58,129 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:25:01,432 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13810#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:25:01,432 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:25:01,432 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:25:01,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 117 [2022-11-22 02:25:01,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174146342] [2022-11-22 02:25:01,433 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:25:01,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-11-22 02:25:01,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:25:01,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-11-22 02:25:01,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=15423, Unknown=0, NotChecked=0, Total=15750 [2022-11-22 02:25:01,436 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand has 118 states, 118 states have (on average 2.847457627118644) internal successors, (336), 117 states have internal predecessors, (336), 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) [2022-11-22 02:25:10,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:25:10,643 INFO L93 Difference]: Finished difference Result 280 states and 281 transitions. [2022-11-22 02:25:10,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-11-22 02:25:10,643 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 2.847457627118644) internal successors, (336), 117 states have internal predecessors, (336), 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 167 [2022-11-22 02:25:10,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:25:10,645 INFO L225 Difference]: With dead ends: 280 [2022-11-22 02:25:10,645 INFO L226 Difference]: Without dead ends: 171 [2022-11-22 02:25:10,647 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 611 GetRequests, 432 SyntacticMatches, 1 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4190 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=654, Invalid=31566, Unknown=0, NotChecked=0, Total=32220 [2022-11-22 02:25:10,648 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 222 mSDsluCounter, 6350 mSDsCounter, 0 mSdLazyCounter, 6854 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 6431 SdHoareTripleChecker+Invalid, 6884 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 6854 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:25:10,649 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 6431 Invalid, 6884 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 6854 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-11-22 02:25:10,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-11-22 02:25:10,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2022-11-22 02:25:10,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.0118343195266273) internal successors, (171), 169 states have internal predecessors, (171), 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) [2022-11-22 02:25:10,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2022-11-22 02:25:10,654 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 167 [2022-11-22 02:25:10,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:25:10,655 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2022-11-22 02:25:10,655 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 2.847457627118644) internal successors, (336), 117 states have internal predecessors, (336), 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) [2022-11-22 02:25:10,655 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2022-11-22 02:25:10,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2022-11-22 02:25:10,657 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:25:10,657 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 1, 1, 1, 1] [2022-11-22 02:25:10,669 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-22 02:25:10,866 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-22 02:25:10,866 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:25:10,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:25:10,867 INFO L85 PathProgramCache]: Analyzing trace with hash 1848196511, now seen corresponding path program 23 times [2022-11-22 02:25:10,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:25:10,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993090128] [2022-11-22 02:25:10,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:25:10,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:25:11,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:25:16,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2242 backedges. 702 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:25:16,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:25:16,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993090128] [2022-11-22 02:25:16,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993090128] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:25:16,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593294722] [2022-11-22 02:25:16,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:25:16,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:25:16,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:25:16,906 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:25:16,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-22 02:25:46,171 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2022-11-22 02:25:46,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:25:46,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 958 conjuncts, 330 conjunts are in the unsatisfiable core [2022-11-22 02:25:46,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:25:46,208 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 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-22 02:25:58,508 INFO L134 CoverageAnalysis]: Checked inductivity of 2242 backedges. 469 proven. 1617 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-11-22 02:25:58,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:26:21,542 INFO L134 CoverageAnalysis]: Checked inductivity of 2242 backedges. 110 proven. 1892 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2022-11-22 02:26:21,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593294722] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:26:21,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1870820000] [2022-11-22 02:26:21,545 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:26:21,546 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:26:21,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:26:21,547 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:26:21,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:26:21,562 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 8 treesize of output 7 [2022-11-22 02:26:21,599 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 14 treesize of output 10 [2022-11-22 02:26:21,634 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 14 treesize of output 10 [2022-11-22 02:26:22,058 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:26:28,289 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15597#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:26:28,290 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:26:28,290 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:26:28,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 77, 74] total 211 [2022-11-22 02:26:28,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853989174] [2022-11-22 02:26:28,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:26:28,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2022-11-22 02:26:28,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:26:28,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2022-11-22 02:26:28,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4100, Invalid=44520, Unknown=0, NotChecked=0, Total=48620 [2022-11-22 02:26:28,298 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand has 213 states, 212 states have (on average 2.1462264150943398) internal successors, (455), 212 states have internal predecessors, (455), 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) [2022-11-22 02:29:02,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:29:02,919 INFO L93 Difference]: Finished difference Result 283 states and 284 transitions. [2022-11-22 02:29:02,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 189 states. [2022-11-22 02:29:02,919 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 212 states have (on average 2.1462264150943398) internal successors, (455), 212 states have internal predecessors, (455), 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 169 [2022-11-22 02:29:02,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:29:02,921 INFO L225 Difference]: With dead ends: 283 [2022-11-22 02:29:02,921 INFO L226 Difference]: Without dead ends: 283 [2022-11-22 02:29:02,932 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 346 SyntacticMatches, 0 SemanticMatches, 391 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25764 ImplicationChecksByTransitivity, 183.8s TimeCoverageRelationStatistics Valid=25399, Invalid=128657, Unknown=0, NotChecked=0, Total=154056 [2022-11-22 02:29:02,933 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 2671 mSDsluCounter, 1663 mSDsCounter, 0 mSdLazyCounter, 10456 mSolverCounterSat, 942 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2671 SdHoareTripleChecker+Valid, 1689 SdHoareTripleChecker+Invalid, 11398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 942 IncrementalHoareTripleChecker+Valid, 10456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:29:02,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2671 Valid, 1689 Invalid, 11398 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [942 Valid, 10456 Invalid, 0 Unknown, 0 Unchecked, 9.8s Time] [2022-11-22 02:29:02,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2022-11-22 02:29:02,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 282. [2022-11-22 02:29:02,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 281 states have (on average 1.00711743772242) internal successors, (283), 281 states have internal predecessors, (283), 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) [2022-11-22 02:29:02,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 283 transitions. [2022-11-22 02:29:02,939 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 283 transitions. Word has length 169 [2022-11-22 02:29:02,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:29:02,940 INFO L495 AbstractCegarLoop]: Abstraction has 282 states and 283 transitions. [2022-11-22 02:29:02,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 212 states have (on average 2.1462264150943398) internal successors, (455), 212 states have internal predecessors, (455), 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) [2022-11-22 02:29:02,941 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 283 transitions. [2022-11-22 02:29:02,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2022-11-22 02:29:02,942 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:29:02,942 INFO L195 NwaCegarLoop]: trace histogram [56, 55, 55, 55, 28, 28, 1, 1, 1, 1] [2022-11-22 02:29:02,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-22 02:29:03,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-22 02:29:03,155 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:29:03,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:29:03,156 INFO L85 PathProgramCache]: Analyzing trace with hash -84253473, now seen corresponding path program 24 times [2022-11-22 02:29:03,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:29:03,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994194791] [2022-11-22 02:29:03,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:29:03,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:29:03,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:29:22,192 INFO L134 CoverageAnalysis]: Checked inductivity of 6834 backedges. 0 proven. 6834 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:29:22,192 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:29:22,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994194791] [2022-11-22 02:29:22,192 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994194791] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:29:22,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254986533] [2022-11-22 02:29:22,192 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:29:22,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:29:22,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:29:22,193 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:29:22,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-22 02:29:24,193 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:29:24,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:29:24,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 1531 conjuncts, 402 conjunts are in the unsatisfiable core [2022-11-22 02:29:24,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:29:24,226 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 02:29:40,639 INFO L134 CoverageAnalysis]: Checked inductivity of 6834 backedges. 5996 proven. 838 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:29:40,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:29:59,066 INFO L134 CoverageAnalysis]: Checked inductivity of 6834 backedges. 5996 proven. 838 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:29:59,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254986533] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:29:59,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [629794387] [2022-11-22 02:29:59,068 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:29:59,068 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:29:59,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:29:59,068 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:29:59,069 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:29:59,092 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 8 treesize of output 7 [2022-11-22 02:29:59,117 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 14 treesize of output 10 [2022-11-22 02:29:59,141 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 14 treesize of output 10 [2022-11-22 02:29:59,423 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:30:05,072 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18460#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:30:05,072 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:30:05,072 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:30:05,072 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 88, 88] total 265 [2022-11-22 02:30:05,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848274301] [2022-11-22 02:30:05,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:30:05,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 266 states [2022-11-22 02:30:05,074 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:05,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 266 interpolants. [2022-11-22 02:30:05,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9735, Invalid=65067, Unknown=0, NotChecked=0, Total=74802 [2022-11-22 02:30:05,081 INFO L87 Difference]: Start difference. First operand 282 states and 283 transitions. Second operand has 266 states, 266 states have (on average 3.154135338345865) internal successors, (839), 265 states have internal predecessors, (839), 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) [2022-11-22 02:31:12,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:12,211 INFO L93 Difference]: Finished difference Result 670 states and 696 transitions. [2022-11-22 02:31:12,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2022-11-22 02:31:12,212 INFO L78 Accepts]: Start accepts. Automaton has has 266 states, 266 states have (on average 3.154135338345865) internal successors, (839), 265 states have internal predecessors, (839), 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 281 [2022-11-22 02:31:12,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:12,214 INFO L225 Difference]: With dead ends: 670 [2022-11-22 02:31:12,214 INFO L226 Difference]: Without dead ends: 336 [2022-11-22 02:31:12,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1075 GetRequests, 659 SyntacticMatches, 0 SemanticMatches, 416 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35602 ImplicationChecksByTransitivity, 101.4s TimeCoverageRelationStatistics Valid=25685, Invalid=148621, Unknown=0, NotChecked=0, Total=174306 [2022-11-22 02:31:12,224 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 936 mSDsluCounter, 3413 mSDsCounter, 0 mSdLazyCounter, 17463 mSolverCounterSat, 580 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 936 SdHoareTripleChecker+Valid, 3441 SdHoareTripleChecker+Invalid, 18043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 580 IncrementalHoareTripleChecker+Valid, 17463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:12,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [936 Valid, 3441 Invalid, 18043 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [580 Valid, 17463 Invalid, 0 Unknown, 0 Unchecked, 9.9s Time] [2022-11-22 02:31:12,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2022-11-22 02:31:12,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 336. [2022-11-22 02:31:12,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 1.0059701492537314) internal successors, (337), 335 states have internal predecessors, (337), 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) [2022-11-22 02:31:12,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 337 transitions. [2022-11-22 02:31:12,231 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 337 transitions. Word has length 281 [2022-11-22 02:31:12,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:12,232 INFO L495 AbstractCegarLoop]: Abstraction has 336 states and 337 transitions. [2022-11-22 02:31:12,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 266 states, 266 states have (on average 3.154135338345865) internal successors, (839), 265 states have internal predecessors, (839), 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) [2022-11-22 02:31:12,233 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 337 transitions. [2022-11-22 02:31:12,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2022-11-22 02:31:12,234 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:12,235 INFO L195 NwaCegarLoop]: trace histogram [56, 55, 55, 55, 55, 55, 1, 1, 1, 1] [2022-11-22 02:31:12,246 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:12,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:12,439 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:31:12,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:12,440 INFO L85 PathProgramCache]: Analyzing trace with hash -1680052492, now seen corresponding path program 25 times [2022-11-22 02:31:12,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:12,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698460868] [2022-11-22 02:31:12,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:12,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:12,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:23,639 INFO L134 CoverageAnalysis]: Checked inductivity of 9075 backedges. 110 proven. 8965 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:31:23,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:23,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698460868] [2022-11-22 02:31:23,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698460868] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:23,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227305048] [2022-11-22 02:31:23,640 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:31:23,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:23,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:23,641 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:23,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-22 02:31:37,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:37,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 1882 conjuncts, 228 conjunts are in the unsatisfiable core [2022-11-22 02:31:37,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:39,075 INFO L134 CoverageAnalysis]: Checked inductivity of 9075 backedges. 110 proven. 8965 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:31:39,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:32:00,807 INFO L134 CoverageAnalysis]: Checked inductivity of 9075 backedges. 110 proven. 8965 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:32:00,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227305048] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:32:00,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1934102706] [2022-11-22 02:32:00,809 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 02:32:00,809 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:32:00,809 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:32:00,809 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:32:00,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:32:00,825 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 8 treesize of output 7 [2022-11-22 02:32:00,848 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 14 treesize of output 10 [2022-11-22 02:32:00,878 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 14 treesize of output 10 [2022-11-22 02:32:01,185 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:32:07,096 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21996#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-22 02:32:07,097 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:32:07,097 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:32:07,097 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [114, 114, 114] total 229 [2022-11-22 02:32:07,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981456821] [2022-11-22 02:32:07,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:32:07,099 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 230 states [2022-11-22 02:32:07,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:32:07,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 230 interpolants. [2022-11-22 02:32:07,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=55799, Unknown=0, NotChecked=0, Total=56406 [2022-11-22 02:32:07,103 INFO L87 Difference]: Start difference. First operand 336 states and 337 transitions. Second operand has 230 states, 230 states have (on average 2.9217391304347826) internal successors, (672), 229 states have internal predecessors, (672), 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) [2022-11-22 02:32:41,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:32:41,641 INFO L93 Difference]: Finished difference Result 560 states and 561 transitions. [2022-11-22 02:32:41,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 169 states. [2022-11-22 02:32:41,642 INFO L78 Accepts]: Start accepts. Automaton has has 230 states, 230 states have (on average 2.9217391304347826) internal successors, (672), 229 states have internal predecessors, (672), 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 335 [2022-11-22 02:32:41,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:32:41,643 INFO L225 Difference]: With dead ends: 560 [2022-11-22 02:32:41,644 INFO L226 Difference]: Without dead ends: 339 [2022-11-22 02:32:41,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1227 GetRequests, 880 SyntacticMatches, 1 SemanticMatches, 346 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14606 ImplicationChecksByTransitivity, 52.4s TimeCoverageRelationStatistics Valid=1270, Invalid=119486, Unknown=0, NotChecked=0, Total=120756 [2022-11-22 02:32:41,650 INFO L413 NwaCegarLoop]: 165 mSDtfsCounter, 445 mSDsluCounter, 27049 mSDsCounter, 0 mSdLazyCounter, 28200 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 445 SdHoareTripleChecker+Valid, 27214 SdHoareTripleChecker+Invalid, 28258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 28200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:32:41,650 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [445 Valid, 27214 Invalid, 28258 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [58 Valid, 28200 Invalid, 0 Unknown, 0 Unchecked, 15.1s Time] [2022-11-22 02:32:41,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2022-11-22 02:32:41,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 338. [2022-11-22 02:32:41,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 337 states have (on average 1.0059347181008902) internal successors, (339), 337 states have internal predecessors, (339), 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) [2022-11-22 02:32:41,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 339 transitions. [2022-11-22 02:32:41,656 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 339 transitions. Word has length 335 [2022-11-22 02:32:41,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:32:41,657 INFO L495 AbstractCegarLoop]: Abstraction has 338 states and 339 transitions. [2022-11-22 02:32:41,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 230 states, 230 states have (on average 2.9217391304347826) internal successors, (672), 229 states have internal predecessors, (672), 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) [2022-11-22 02:32:41,658 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 339 transitions. [2022-11-22 02:32:41,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2022-11-22 02:32:41,659 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:32:41,660 INFO L195 NwaCegarLoop]: trace histogram [56, 56, 56, 55, 55, 55, 1, 1, 1, 1] [2022-11-22 02:32:41,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-22 02:32:41,875 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:32:41,875 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-22 02:32:41,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:32:41,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1433746429, now seen corresponding path program 26 times [2022-11-22 02:32:41,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:32:41,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661682809] [2022-11-22 02:32:41,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:32:41,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:32:42,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:32:56,967 INFO L134 CoverageAnalysis]: Checked inductivity of 9186 backedges. 2970 proven. 6216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:32:56,967 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:32:56,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661682809] [2022-11-22 02:32:56,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661682809] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:32:56,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28409530] [2022-11-22 02:32:56,968 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:32:56,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:32:56,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:32:56,969 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:32:56,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f05de014-f502-4f72-afd2-d947aa26bd09/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process