./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrncat-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrncat-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7 --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 34885b99d6eef31987b044fabc3622fa239d5dff7e774ca124915f70431dc2b3 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:58:54,030 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:58:54,033 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:58:54,073 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:58:54,074 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:58:54,076 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:58:54,078 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:58:54,080 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:58:54,082 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:58:54,083 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:58:54,084 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:58:54,086 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:58:54,086 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:58:54,088 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:58:54,089 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:58:54,091 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:58:54,092 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:58:54,093 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:58:54,096 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:58:54,098 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:58:54,100 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:58:54,110 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:58:54,112 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:58:54,116 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:58:54,120 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:58:54,124 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:58:54,124 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:58:54,126 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:58:54,127 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:58:54,128 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:58:54,130 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:58:54,131 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:58:54,133 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:58:54,133 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:58:54,135 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:58:54,135 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:58:54,136 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:58:54,136 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:58:54,136 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:58:54,137 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:58:54,138 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:58:54,139 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-25 17:58:54,184 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:58:54,185 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:58:54,185 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:58:54,186 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:58:54,187 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:58:54,187 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:58:54,187 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:58:54,187 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:58:54,188 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:58:54,188 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:58:54,189 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:58:54,189 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:58:54,190 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:58:54,190 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:58:54,190 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:58:54,190 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:58:54,191 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:58:54,191 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:58:54,192 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 17:58:54,192 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 17:58:54,192 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:58:54,192 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 17:58:54,192 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 17:58:54,194 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:58:54,194 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 17:58:54,194 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:58:54,195 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 17:58:54,195 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 17:58:54,195 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 17:58:54,195 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:58:54,196 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 17:58:54,196 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 17:58:54,196 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:58:54,196 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:58:54,197 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:58:54,197 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:58:54,198 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:58:54,198 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:58:54,198 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:58:54,198 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:58:54,199 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:58:54,199 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:58:54,199 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 34885b99d6eef31987b044fabc3622fa239d5dff7e774ca124915f70431dc2b3 [2021-11-25 17:58:54,510 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:58:54,542 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:58:54,545 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:58:54,546 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:58:54,547 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:58:54,548 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-memsafety/openbsd_cstrncat-alloca-2.i [2021-11-25 17:58:54,632 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/data/cf56b5cf0/7739708da6eb4b39a7032c26cb305e52/FLAG044e595f1 [2021-11-25 17:58:55,156 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:58:55,157 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/sv-benchmarks/c/array-memsafety/openbsd_cstrncat-alloca-2.i [2021-11-25 17:58:55,181 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/data/cf56b5cf0/7739708da6eb4b39a7032c26cb305e52/FLAG044e595f1 [2021-11-25 17:58:55,470 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/data/cf56b5cf0/7739708da6eb4b39a7032c26cb305e52 [2021-11-25 17:58:55,473 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:58:55,474 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:58:55,479 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:58:55,479 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:58:55,482 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:58:55,483 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:58:55" (1/1) ... [2021-11-25 17:58:55,484 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f3f97dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:55, skipping insertion in model container [2021-11-25 17:58:55,484 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:58:55" (1/1) ... [2021-11-25 17:58:55,491 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:58:55,547 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:58:55,924 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:58:55,934 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:58:55,989 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:58:56,017 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:58:56,018 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56 WrapperNode [2021-11-25 17:58:56,018 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:58:56,019 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:58:56,019 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:58:56,019 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:58:56,028 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (1/1) ... [2021-11-25 17:58:56,040 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (1/1) ... [2021-11-25 17:58:56,071 INFO L137 Inliner]: procedures = 117, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 103 [2021-11-25 17:58:56,071 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:58:56,072 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:58:56,072 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:58:56,072 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:58:56,084 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (1/1) ... [2021-11-25 17:58:56,084 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (1/1) ... [2021-11-25 17:58:56,099 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (1/1) ... [2021-11-25 17:58:56,101 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (1/1) ... [2021-11-25 17:58:56,113 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (1/1) ... [2021-11-25 17:58:56,123 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (1/1) ... [2021-11-25 17:58:56,125 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (1/1) ... [2021-11-25 17:58:56,130 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:58:56,131 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:58:56,132 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:58:56,137 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:58:56,139 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (1/1) ... [2021-11-25 17:58:56,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:58:56,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:58:56,166 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:58:56,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:58:56,202 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 17:58:56,203 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 17:58:56,203 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 17:58:56,203 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 17:58:56,203 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:58:56,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:58:56,296 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:58:56,297 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:58:56,550 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:58:56,628 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:58:56,629 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-25 17:58:56,632 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:58:56 BoogieIcfgContainer [2021-11-25 17:58:56,632 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:58:56,636 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:58:56,636 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:58:56,641 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:58:56,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:58:55" (1/3) ... [2021-11-25 17:58:56,643 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d863e5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:58:56, skipping insertion in model container [2021-11-25 17:58:56,643 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:58:56" (2/3) ... [2021-11-25 17:58:56,643 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d863e5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:58:56, skipping insertion in model container [2021-11-25 17:58:56,644 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:58:56" (3/3) ... [2021-11-25 17:58:56,645 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrncat-alloca-2.i [2021-11-25 17:58:56,656 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:58:56,657 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 17 error locations. [2021-11-25 17:58:56,708 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:58:56,716 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 17:58:56,716 INFO L340 AbstractCegarLoop]: Starting to check reachability of 17 error locations. [2021-11-25 17:58:56,731 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 19 states have (on average 2.3684210526315788) internal successors, (45), 36 states have internal predecessors, (45), 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) [2021-11-25 17:58:56,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 17:58:56,738 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:56,739 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 17:58:56,739 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:58:56,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:56,745 INFO L85 PathProgramCache]: Analyzing trace with hash 163242, now seen corresponding path program 1 times [2021-11-25 17:58:56,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:58:56,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64423083] [2021-11-25 17:58:56,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:56,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:58:56,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:56,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:56,914 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:58:56,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64423083] [2021-11-25 17:58:56,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64423083] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:58:56,916 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:58:56,916 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 17:58:56,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504804572] [2021-11-25 17:58:56,918 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:56,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:58:56,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:58:56,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:58:56,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:58:56,954 INFO L87 Difference]: Start difference. First operand has 37 states, 19 states have (on average 2.3684210526315788) internal successors, (45), 36 states have internal predecessors, (45), 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) [2021-11-25 17:58:57,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:57,058 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2021-11-25 17:58:57,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:58:57,061 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 [2021-11-25 17:58:57,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:57,069 INFO L225 Difference]: With dead ends: 38 [2021-11-25 17:58:57,069 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 17:58:57,072 INFO L932 BasicCegarLoop]: 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 [2021-11-25 17:58:57,077 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 1 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:57,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 51 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:58:57,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 17:58:57,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-25 17:58:57,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 35 states have internal predecessors, (41), 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) [2021-11-25 17:58:57,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-11-25 17:58:57,121 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 3 [2021-11-25 17:58:57,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:57,121 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-11-25 17:58:57,122 INFO L471 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) [2021-11-25 17:58:57,122 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-11-25 17:58:57,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 17:58:57,122 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:57,123 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 17:58:57,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 17:58:57,123 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:58:57,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:57,128 INFO L85 PathProgramCache]: Analyzing trace with hash 5059762, now seen corresponding path program 1 times [2021-11-25 17:58:57,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:58:57,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435548753] [2021-11-25 17:58:57,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:57,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:58:57,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:57,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:57,263 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:58:57,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435548753] [2021-11-25 17:58:57,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435548753] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:58:57,265 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:58:57,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 17:58:57,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877414353] [2021-11-25 17:58:57,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:57,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:58:57,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:58:57,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:58:57,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:58:57,268 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:57,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:57,326 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2021-11-25 17:58:57,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:58:57,327 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-25 17:58:57,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:57,329 INFO L225 Difference]: With dead ends: 34 [2021-11-25 17:58:57,329 INFO L226 Difference]: Without dead ends: 34 [2021-11-25 17:58:57,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:58:57,331 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 34 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:57,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 18 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:58:57,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-25 17:58:57,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-25 17:58:57,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:57,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2021-11-25 17:58:57,337 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 4 [2021-11-25 17:58:57,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:57,338 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2021-11-25 17:58:57,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:57,338 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2021-11-25 17:58:57,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 17:58:57,341 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:57,341 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 17:58:57,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 17:58:57,346 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:58:57,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:57,347 INFO L85 PathProgramCache]: Analyzing trace with hash 5059763, now seen corresponding path program 1 times [2021-11-25 17:58:57,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:58:57,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329469795] [2021-11-25 17:58:57,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:57,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:58:57,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:57,513 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:57,513 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:58:57,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329469795] [2021-11-25 17:58:57,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329469795] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:58:57,514 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:58:57,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:58:57,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938913864] [2021-11-25 17:58:57,515 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:57,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:58:57,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:58:57,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:58:57,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:58:57,517 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:57,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:57,656 INFO L93 Difference]: Finished difference Result 65 states and 75 transitions. [2021-11-25 17:58:57,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:58:57,657 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-25 17:58:57,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:57,661 INFO L225 Difference]: With dead ends: 65 [2021-11-25 17:58:57,661 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 17:58:57,662 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:58:57,666 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 35 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:57,669 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 50 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:58:57,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 17:58:57,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 36. [2021-11-25 17:58:57,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 2.0) internal successors, (42), 35 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:57,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-11-25 17:58:57,680 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 4 [2021-11-25 17:58:57,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:57,681 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-11-25 17:58:57,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:57,682 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-11-25 17:58:57,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 17:58:57,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:57,683 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 17:58:57,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 17:58:57,684 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:58:57,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:57,685 INFO L85 PathProgramCache]: Analyzing trace with hash 156955998, now seen corresponding path program 1 times [2021-11-25 17:58:57,685 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:58:57,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292615405] [2021-11-25 17:58:57,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:57,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:58:57,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:57,803 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:57,804 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:58:57,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292615405] [2021-11-25 17:58:57,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292615405] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:58:57,804 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:58:57,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 17:58:57,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348484068] [2021-11-25 17:58:57,805 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:57,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:58:57,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:58:57,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:58:57,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:58:57,810 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 5 states, 5 states have (on average 1.0) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:57,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:57,917 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-11-25 17:58:57,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:58:57,917 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-25 17:58:57,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:57,918 INFO L225 Difference]: With dead ends: 62 [2021-11-25 17:58:57,919 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 17:58:57,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:58:57,920 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 129 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:57,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 74 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:58:57,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 17:58:57,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 37. [2021-11-25 17:58:57,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 36 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) [2021-11-25 17:58:57,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-11-25 17:58:57,927 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 5 [2021-11-25 17:58:57,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:57,927 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-11-25 17:58:57,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:57,927 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-11-25 17:58:57,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 17:58:57,928 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:57,928 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 17:58:57,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 17:58:57,928 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:58:57,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:57,929 INFO L85 PathProgramCache]: Analyzing trace with hash 156958550, now seen corresponding path program 1 times [2021-11-25 17:58:57,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:58:57,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021479063] [2021-11-25 17:58:57,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:57,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:58:57,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:58,014 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:58,014 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:58:58,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021479063] [2021-11-25 17:58:58,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2021479063] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:58:58,015 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:58:58,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:58:58,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754777046] [2021-11-25 17:58:58,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:58,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:58:58,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:58:58,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:58:58,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:58:58,019 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:58,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:58,060 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-11-25 17:58:58,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:58:58,060 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-25 17:58:58,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:58,062 INFO L225 Difference]: With dead ends: 36 [2021-11-25 17:58:58,063 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 17:58:58,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:58:58,067 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 39 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:58,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 49 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:58:58,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 17:58:58,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-25 17:58:58,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 35 states have internal predecessors, (41), 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) [2021-11-25 17:58:58,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-11-25 17:58:58,084 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 5 [2021-11-25 17:58:58,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:58,085 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-11-25 17:58:58,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:58,085 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-11-25 17:58:58,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 17:58:58,085 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:58,085 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2021-11-25 17:58:58,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 17:58:58,086 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:58:58,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:58,086 INFO L85 PathProgramCache]: Analyzing trace with hash 567552496, now seen corresponding path program 1 times [2021-11-25 17:58:58,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:58:58,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676603653] [2021-11-25 17:58:58,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:58,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:58:58,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:58,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:58,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:58:58,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676603653] [2021-11-25 17:58:58,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676603653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:58:58,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185319575] [2021-11-25 17:58:58,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:58,241 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:58,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:58:58,250 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:58:58,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 17:58:58,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:58,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 17:58:58,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:58,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:58:58,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:58:58,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:58:58,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:58,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:58,723 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:58,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1185319575] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:58,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2113045121] [2021-11-25 17:58:58,742 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-25 17:58:58,742 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:58:58,747 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:58:58,753 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:58:58,753 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:58:58,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:58:58,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:58:58,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:58:58,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:58:59,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:58:59,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:58:59,191 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:58:59,574 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '519#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_#t~nondet14#1| 127) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~i~0#1| 1)) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet14#1|)) (= |#NULL.base| 0))' at error location [2021-11-25 17:58:59,574 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:58:59,574 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:58:59,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-11-25 17:58:59,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580266537] [2021-11-25 17:58:59,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:58:59,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 17:58:59,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:58:59,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 17:58:59,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-25 17:58:59,576 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 10 states, 9 states have (on average 1.6666666666666667) 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) [2021-11-25 17:58:59,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:59,762 INFO L93 Difference]: Finished difference Result 65 states and 75 transitions. [2021-11-25 17:58:59,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:58:59,762 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.6666666666666667) 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 6 [2021-11-25 17:58:59,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:59,763 INFO L225 Difference]: With dead ends: 65 [2021-11-25 17:58:59,763 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 17:58:59,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-11-25 17:58:59,764 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 105 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:59,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 97 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:58:59,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 17:58:59,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 34. [2021-11-25 17:58:59,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 20 states have (on average 1.95) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:59,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2021-11-25 17:58:59,769 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 6 [2021-11-25 17:58:59,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:59,769 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2021-11-25 17:58:59,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.6666666666666667) 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) [2021-11-25 17:58:59,774 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2021-11-25 17:58:59,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 17:58:59,774 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:59,774 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:59,801 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:59,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:59,975 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:58:59,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:59,975 INFO L85 PathProgramCache]: Analyzing trace with hash 414361537, now seen corresponding path program 1 times [2021-11-25 17:58:59,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:58:59,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13087749] [2021-11-25 17:58:59,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:59,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:58:59,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:00,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:00,014 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:00,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13087749] [2021-11-25 17:59:00,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13087749] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:00,015 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:59:00,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 17:59:00,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596889467] [2021-11-25 17:59:00,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:00,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:59:00,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:00,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:59:00,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:59:00,016 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:00,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:00,042 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-11-25 17:59:00,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:59:00,043 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 17:59:00,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:00,043 INFO L225 Difference]: With dead ends: 32 [2021-11-25 17:59:00,043 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 17:59:00,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:59:00,045 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 28 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:00,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 17 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:59:00,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 17:59:00,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-25 17:59:00,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.85) internal successors, (37), 31 states have internal predecessors, (37), 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) [2021-11-25 17:59:00,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2021-11-25 17:59:00,056 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 7 [2021-11-25 17:59:00,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:00,056 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2021-11-25 17:59:00,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:00,056 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2021-11-25 17:59:00,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 17:59:00,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:00,056 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:00,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 17:59:00,057 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:00,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:00,057 INFO L85 PathProgramCache]: Analyzing trace with hash 414361538, now seen corresponding path program 1 times [2021-11-25 17:59:00,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:00,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995231217] [2021-11-25 17:59:00,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:00,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:00,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:00,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:00,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:00,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995231217] [2021-11-25 17:59:00,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995231217] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:00,150 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:59:00,150 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 17:59:00,151 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093902590] [2021-11-25 17:59:00,151 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:00,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:59:00,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:00,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:59:00,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:59:00,153 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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) [2021-11-25 17:59:00,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:00,239 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2021-11-25 17:59:00,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:59:00,240 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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 [2021-11-25 17:59:00,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:00,241 INFO L225 Difference]: With dead ends: 58 [2021-11-25 17:59:00,241 INFO L226 Difference]: Without dead ends: 58 [2021-11-25 17:59:00,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:59:00,242 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 61 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:00,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 43 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:59:00,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-25 17:59:00,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 34. [2021-11-25 17:59:00,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 33 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:00,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-11-25 17:59:00,246 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 7 [2021-11-25 17:59:00,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:00,246 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-11-25 17:59:00,246 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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) [2021-11-25 17:59:00,246 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-11-25 17:59:00,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 17:59:00,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:00,247 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:00,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 17:59:00,247 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:00,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:00,247 INFO L85 PathProgramCache]: Analyzing trace with hash 414364089, now seen corresponding path program 1 times [2021-11-25 17:59:00,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:00,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285407753] [2021-11-25 17:59:00,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:00,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:00,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:00,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:00,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:00,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285407753] [2021-11-25 17:59:00,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1285407753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:00,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291608806] [2021-11-25 17:59:00,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:00,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:00,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:00,498 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:00,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 17:59:00,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:00,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:59:00,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:00,697 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:00,697 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:59:00,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291608806] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:00,697 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:59:00,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 9 [2021-11-25 17:59:00,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915454036] [2021-11-25 17:59:00,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:00,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:59:00,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:00,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:59:00,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:59:00,699 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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) [2021-11-25 17:59:00,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:00,751 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2021-11-25 17:59:00,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:59:00,751 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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 [2021-11-25 17:59:00,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:00,752 INFO L225 Difference]: With dead ends: 33 [2021-11-25 17:59:00,752 INFO L226 Difference]: Without dead ends: 33 [2021-11-25 17:59:00,752 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-25 17:59:00,753 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 126 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:00,753 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 13 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:59:00,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-25 17:59:00,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-25 17:59:00,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:00,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-11-25 17:59:00,756 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 7 [2021-11-25 17:59:00,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:00,756 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-11-25 17:59:00,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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) [2021-11-25 17:59:00,757 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-11-25 17:59:00,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 17:59:00,757 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:00,757 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:00,802 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:00,977 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:00,977 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:00,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:00,978 INFO L85 PathProgramCache]: Analyzing trace with hash -39615125, now seen corresponding path program 1 times [2021-11-25 17:59:00,978 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:00,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762033636] [2021-11-25 17:59:00,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:00,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:00,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:01,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:01,022 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:01,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762033636] [2021-11-25 17:59:01,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762033636] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:01,022 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:59:01,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 17:59:01,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985741068] [2021-11-25 17:59:01,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:01,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:59:01,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:01,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:59:01,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:59:01,024 INFO L87 Difference]: Start difference. First operand 33 states and 39 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) [2021-11-25 17:59:01,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:01,052 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2021-11-25 17:59:01,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:59:01,052 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 [2021-11-25 17:59:01,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:01,053 INFO L225 Difference]: With dead ends: 32 [2021-11-25 17:59:01,053 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 17:59:01,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:59:01,054 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 33 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:01,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 14 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:59:01,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 17:59:01,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-25 17:59:01,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 31 states have internal predecessors, (38), 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) [2021-11-25 17:59:01,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-11-25 17:59:01,057 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 8 [2021-11-25 17:59:01,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:01,057 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-11-25 17:59:01,057 INFO L471 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) [2021-11-25 17:59:01,058 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-11-25 17:59:01,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 17:59:01,058 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:01,058 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:01,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 17:59:01,058 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:01,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:01,059 INFO L85 PathProgramCache]: Analyzing trace with hash -1230447761, now seen corresponding path program 1 times [2021-11-25 17:59:01,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:01,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515449398] [2021-11-25 17:59:01,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:01,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:01,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:01,150 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:01,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:01,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515449398] [2021-11-25 17:59:01,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515449398] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:01,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768145841] [2021-11-25 17:59:01,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:01,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:01,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:01,152 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:01,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 17:59:01,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:01,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 17:59:01,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:01,242 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 17:59:01,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 17:59:01,333 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:01,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:01,524 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:01,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768145841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:01,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1099750518] [2021-11-25 17:59:01,527 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 17:59:01,527 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:01,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:01,527 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:01,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:01,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:01,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:01,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:01,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:01,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:01,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:01,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:01,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:02,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:02,017 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:59:02,653 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1020#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet16#1|)) (<= |ULTIMATE.start_main_#t~nondet16#1| 127) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~i~1#1| 1)) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 17:59:02,653 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:59:02,653 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:59:02,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2021-11-25 17:59:02,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672402859] [2021-11-25 17:59:02,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:59:02,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 17:59:02,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:02,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 17:59:02,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-11-25 17:59:02,655 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 13 states, 12 states have (on average 2.0) internal successors, (24), 13 states have internal predecessors, (24), 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) [2021-11-25 17:59:02,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:02,826 INFO L93 Difference]: Finished difference Result 76 states and 89 transitions. [2021-11-25 17:59:02,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:59:02,827 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 17:59:02,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:02,828 INFO L225 Difference]: With dead ends: 76 [2021-11-25 17:59:02,828 INFO L226 Difference]: Without dead ends: 76 [2021-11-25 17:59:02,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2021-11-25 17:59:02,829 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 344 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 344 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:02,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [344 Valid, 121 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:59:02,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-25 17:59:02,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 29. [2021-11-25 17:59:02,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.7) internal successors, (34), 28 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:02,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2021-11-25 17:59:02,832 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 9 [2021-11-25 17:59:02,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:02,832 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2021-11-25 17:59:02,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0) internal successors, (24), 13 states have internal predecessors, (24), 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) [2021-11-25 17:59:02,833 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2021-11-25 17:59:02,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 17:59:02,833 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:02,833 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:02,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:03,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 17:59:03,045 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:03,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:03,046 INFO L85 PathProgramCache]: Analyzing trace with hash 584631406, now seen corresponding path program 1 times [2021-11-25 17:59:03,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:03,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020337025] [2021-11-25 17:59:03,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:03,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:03,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:03,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:03,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:03,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020337025] [2021-11-25 17:59:03,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1020337025] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:03,081 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:59:03,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 17:59:03,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274824261] [2021-11-25 17:59:03,082 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:03,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:59:03,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:03,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:59:03,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:59:03,083 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 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) [2021-11-25 17:59:03,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:03,140 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-11-25 17:59:03,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:59:03,141 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 17:59:03,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:03,142 INFO L225 Difference]: With dead ends: 27 [2021-11-25 17:59:03,142 INFO L226 Difference]: Without dead ends: 27 [2021-11-25 17:59:03,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:59:03,143 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 50 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:03,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 16 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:59:03,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-25 17:59:03,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-11-25 17:59:03,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.55) internal successors, (31), 25 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) [2021-11-25 17:59:03,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-11-25 17:59:03,154 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 10 [2021-11-25 17:59:03,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:03,155 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-11-25 17:59:03,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 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) [2021-11-25 17:59:03,155 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-11-25 17:59:03,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 17:59:03,156 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:03,156 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:03,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 17:59:03,156 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:03,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:03,157 INFO L85 PathProgramCache]: Analyzing trace with hash 584631407, now seen corresponding path program 1 times [2021-11-25 17:59:03,157 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:03,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64705799] [2021-11-25 17:59:03,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:03,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:03,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:03,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:03,233 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:03,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64705799] [2021-11-25 17:59:03,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64705799] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:03,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903088312] [2021-11-25 17:59:03,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:03,234 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:03,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:03,235 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:03,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 17:59:03,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:03,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 17:59:03,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:03,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:03,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:03,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:59:03,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:03,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:03,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:03,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903088312] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:03,558 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:59:03,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 5] total 13 [2021-11-25 17:59:03,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700335592] [2021-11-25 17:59:03,561 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:03,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:59:03,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:03,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:59:03,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-11-25 17:59:03,562 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:03,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:03,638 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2021-11-25 17:59:03,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:59:03,639 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 17:59:03,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:03,639 INFO L225 Difference]: With dead ends: 36 [2021-11-25 17:59:03,639 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 17:59:03,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-11-25 17:59:03,641 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 69 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:03,641 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 22 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:59:03,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 17:59:03,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 31. [2021-11-25 17:59:03,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 25 states have (on average 1.52) internal successors, (38), 30 states have internal predecessors, (38), 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) [2021-11-25 17:59:03,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2021-11-25 17:59:03,643 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 10 [2021-11-25 17:59:03,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:03,644 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2021-11-25 17:59:03,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:03,644 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2021-11-25 17:59:03,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 17:59:03,645 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:03,645 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:03,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:03,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:03,873 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:03,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:03,874 INFO L85 PathProgramCache]: Analyzing trace with hash 943748325, now seen corresponding path program 1 times [2021-11-25 17:59:03,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:03,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386499450] [2021-11-25 17:59:03,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:03,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:03,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:04,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:04,009 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:04,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386499450] [2021-11-25 17:59:04,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386499450] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:04,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402694125] [2021-11-25 17:59:04,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:04,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:04,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:04,011 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:04,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 17:59:04,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:04,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 17:59:04,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:04,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:04,300 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:59:04,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402694125] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:04,300 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:59:04,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 10 [2021-11-25 17:59:04,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436700225] [2021-11-25 17:59:04,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:04,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:59:04,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:04,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:59:04,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:59:04,303 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:04,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:04,313 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-11-25 17:59:04,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:59:04,314 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 17:59:04,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:04,314 INFO L225 Difference]: With dead ends: 39 [2021-11-25 17:59:04,314 INFO L226 Difference]: Without dead ends: 37 [2021-11-25 17:59:04,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:59:04,315 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 2 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:04,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 46 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 16 Unchecked, 0.0s Time] [2021-11-25 17:59:04,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-25 17:59:04,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-11-25 17:59:04,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 34 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) [2021-11-25 17:59:04,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2021-11-25 17:59:04,318 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 11 [2021-11-25 17:59:04,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:04,319 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2021-11-25 17:59:04,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:04,319 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2021-11-25 17:59:04,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 17:59:04,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:04,320 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:04,357 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-25 17:59:04,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 17:59:04,542 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:04,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:04,543 INFO L85 PathProgramCache]: Analyzing trace with hash -809932952, now seen corresponding path program 1 times [2021-11-25 17:59:04,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:04,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946708004] [2021-11-25 17:59:04,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:04,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:04,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:04,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:04,662 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:04,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946708004] [2021-11-25 17:59:04,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946708004] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:04,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904353780] [2021-11-25 17:59:04,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:04,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:04,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:04,663 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:04,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 17:59:04,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:04,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 17:59:04,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:04,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:04,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:04,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:59:04,878 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:04,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:05,056 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:05,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904353780] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:05,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [261213251] [2021-11-25 17:59:05,060 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 17:59:05,060 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:05,061 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:05,061 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:05,061 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:05,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:05,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:05,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:05,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:05,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:05,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:05,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:05,451 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 17:59:05,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 17:59:05,715 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:59:07,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1538#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 17:59:07,659 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:59:07,659 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:59:07,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2021-11-25 17:59:07,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193177853] [2021-11-25 17:59:07,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:59:07,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 17:59:07,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:07,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 17:59:07,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=660, Unknown=0, NotChecked=0, Total=756 [2021-11-25 17:59:07,661 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:07,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:07,997 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2021-11-25 17:59:07,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:59:07,998 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-25 17:59:07,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:07,998 INFO L225 Difference]: With dead ends: 69 [2021-11-25 17:59:07,999 INFO L226 Difference]: Without dead ends: 69 [2021-11-25 17:59:07,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=171, Invalid=951, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 17:59:08,000 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 401 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 401 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:08,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [401 Valid, 84 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:59:08,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-25 17:59:08,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 42. [2021-11-25 17:59:08,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 41 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) [2021-11-25 17:59:08,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 55 transitions. [2021-11-25 17:59:08,003 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 55 transitions. Word has length 12 [2021-11-25 17:59:08,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:08,003 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 55 transitions. [2021-11-25 17:59:08,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:08,004 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 55 transitions. [2021-11-25 17:59:08,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 17:59:08,004 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:08,004 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:08,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:08,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 17:59:08,220 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:08,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:08,220 INFO L85 PathProgramCache]: Analyzing trace with hash -1016395246, now seen corresponding path program 1 times [2021-11-25 17:59:08,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:08,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459548550] [2021-11-25 17:59:08,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:08,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:08,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:08,270 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:08,270 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:08,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459548550] [2021-11-25 17:59:08,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459548550] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:08,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466080163] [2021-11-25 17:59:08,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:08,271 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:08,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:08,287 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:08,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 17:59:08,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:08,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 17:59:08,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:08,416 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:08,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:08,484 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:08,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1466080163] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:08,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [30019911] [2021-11-25 17:59:08,486 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-25 17:59:08,486 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:08,487 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:08,487 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:08,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:08,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:08,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:08,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:08,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:08,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:08,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:08,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:08,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:08,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:08,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:09,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:09,111 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 17:59:09,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 17:59:09,169 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:59:10,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [30019911] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:10,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:59:10,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [5, 5, 5] total 19 [2021-11-25 17:59:10,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75842773] [2021-11-25 17:59:10,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:10,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 17:59:10,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:10,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 17:59:10,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-25 17:59:10,468 INFO L87 Difference]: Start difference. First operand 42 states and 55 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 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) [2021-11-25 17:59:10,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:10,603 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2021-11-25 17:59:10,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 17:59:10,604 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 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) Word has length 13 [2021-11-25 17:59:10,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:10,604 INFO L225 Difference]: With dead ends: 47 [2021-11-25 17:59:10,604 INFO L226 Difference]: Without dead ends: 47 [2021-11-25 17:59:10,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-25 17:59:10,605 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 26 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:10,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 47 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:59:10,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-25 17:59:10,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 38. [2021-11-25 17:59:10,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.53125) internal successors, (49), 37 states have internal predecessors, (49), 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) [2021-11-25 17:59:10,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 49 transitions. [2021-11-25 17:59:10,608 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 49 transitions. Word has length 13 [2021-11-25 17:59:10,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:10,608 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 49 transitions. [2021-11-25 17:59:10,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 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) [2021-11-25 17:59:10,608 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 49 transitions. [2021-11-25 17:59:10,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 17:59:10,609 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:10,609 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:10,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:10,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 17:59:10,825 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:10,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:10,826 INFO L85 PathProgramCache]: Analyzing trace with hash 661880773, now seen corresponding path program 1 times [2021-11-25 17:59:10,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:10,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191874842] [2021-11-25 17:59:10,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:10,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:10,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:10,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:10,869 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:10,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191874842] [2021-11-25 17:59:10,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191874842] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:10,870 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:59:10,870 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 17:59:10,870 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316235750] [2021-11-25 17:59:10,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:10,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:59:10,871 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:10,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:59:10,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:59:10,872 INFO L87 Difference]: Start difference. First operand 38 states and 49 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 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) [2021-11-25 17:59:10,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:10,922 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2021-11-25 17:59:10,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:59:10,923 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 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) Word has length 13 [2021-11-25 17:59:10,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:10,923 INFO L225 Difference]: With dead ends: 37 [2021-11-25 17:59:10,923 INFO L226 Difference]: Without dead ends: 37 [2021-11-25 17:59:10,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:59:10,924 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 31 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:10,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 25 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:59:10,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-25 17:59:10,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-25 17:59:10,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.4375) internal successors, (46), 36 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:10,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2021-11-25 17:59:10,926 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 13 [2021-11-25 17:59:10,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:10,926 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2021-11-25 17:59:10,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 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) [2021-11-25 17:59:10,926 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2021-11-25 17:59:10,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 17:59:10,927 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:10,927 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:10,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-25 17:59:10,927 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:10,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:10,928 INFO L85 PathProgramCache]: Analyzing trace with hash 661880774, now seen corresponding path program 1 times [2021-11-25 17:59:10,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:10,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025249041] [2021-11-25 17:59:10,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:10,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:10,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:11,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:11,017 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:11,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025249041] [2021-11-25 17:59:11,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025249041] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:11,017 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:59:11,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 17:59:11,018 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205378634] [2021-11-25 17:59:11,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:11,018 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:59:11,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:11,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:59:11,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:59:11,020 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 6 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) [2021-11-25 17:59:11,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:11,105 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-11-25 17:59:11,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:59:11,105 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 6 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) Word has length 13 [2021-11-25 17:59:11,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:11,106 INFO L225 Difference]: With dead ends: 41 [2021-11-25 17:59:11,106 INFO L226 Difference]: Without dead ends: 41 [2021-11-25 17:59:11,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-11-25 17:59:11,107 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 51 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:11,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 20 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:59:11,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-25 17:59:11,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-11-25 17:59:11,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 38 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:59:11,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2021-11-25 17:59:11,110 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 13 [2021-11-25 17:59:11,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:11,111 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2021-11-25 17:59:11,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 6 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) [2021-11-25 17:59:11,111 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2021-11-25 17:59:11,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 17:59:11,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:11,112 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:11,112 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-25 17:59:11,112 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:11,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:11,113 INFO L85 PathProgramCache]: Analyzing trace with hash -956485599, now seen corresponding path program 2 times [2021-11-25 17:59:11,113 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:11,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994531075] [2021-11-25 17:59:11,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:11,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:11,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:11,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:11,357 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:11,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994531075] [2021-11-25 17:59:11,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994531075] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:11,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57808399] [2021-11-25 17:59:11,358 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:59:11,358 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:11,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:11,359 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:11,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 17:59:11,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 17:59:11,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:59:11,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-25 17:59:11,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:11,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:59:11,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:11,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 17:59:11,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 17:59:11,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 17:59:11,860 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:11,862 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:59:11,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 10 [2021-11-25 17:59:11,872 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:11,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:11,987 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:59:11,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 25 [2021-11-25 17:59:11,998 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:59:11,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 36 [2021-11-25 17:59:12,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 9 treesize of output 7 [2021-11-25 17:59:12,279 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:12,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:59:12,307 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:12,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57808399] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:12,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [242460719] [2021-11-25 17:59:12,309 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 17:59:12,309 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:12,310 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:12,310 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:12,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:12,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:12,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:12,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:12,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:12,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:12,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:12,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:12,653 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 17:59:12,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 17:59:12,918 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:59:14,606 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2123#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 17:59:14,606 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:59:14,606 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:59:14,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2021-11-25 17:59:14,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152606963] [2021-11-25 17:59:14,607 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:59:14,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 17:59:14,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:14,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 17:59:14,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=868, Unknown=0, NotChecked=0, Total=992 [2021-11-25 17:59:14,609 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 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) [2021-11-25 17:59:14,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:14,978 INFO L93 Difference]: Finished difference Result 49 states and 59 transitions. [2021-11-25 17:59:14,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 17:59:14,978 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 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) Word has length 14 [2021-11-25 17:59:14,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:14,979 INFO L225 Difference]: With dead ends: 49 [2021-11-25 17:59:14,979 INFO L226 Difference]: Without dead ends: 49 [2021-11-25 17:59:14,979 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=193, Invalid=1139, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 17:59:14,980 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 60 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 23 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:14,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 119 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 164 Invalid, 0 Unknown, 23 Unchecked, 0.1s Time] [2021-11-25 17:59:14,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-25 17:59:14,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-11-25 17:59:14,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.3488372093023255) internal successors, (58), 47 states have internal predecessors, (58), 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) [2021-11-25 17:59:14,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2021-11-25 17:59:14,984 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 14 [2021-11-25 17:59:14,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:14,984 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2021-11-25 17:59:14,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 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) [2021-11-25 17:59:14,985 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2021-11-25 17:59:14,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 17:59:14,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:14,986 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:15,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:15,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:15,201 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:15,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:15,202 INFO L85 PathProgramCache]: Analyzing trace with hash -1835762402, now seen corresponding path program 3 times [2021-11-25 17:59:15,202 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:15,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090021664] [2021-11-25 17:59:15,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:15,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:15,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:15,447 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:15,447 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:15,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090021664] [2021-11-25 17:59:15,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090021664] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:15,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701121518] [2021-11-25 17:59:15,448 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 17:59:15,448 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:15,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:15,449 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:15,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 17:59:15,519 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 17:59:15,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:59:15,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-25 17:59:15,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:15,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:15,865 INFO L354 Elim1Store]: treesize reduction 47, result has 21.7 percent of original size [2021-11-25 17:59:15,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-11-25 17:59:16,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:16,304 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:16,321 INFO L354 Elim1Store]: treesize reduction 40, result has 25.9 percent of original size [2021-11-25 17:59:16,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 27 [2021-11-25 17:59:16,351 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:16,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:18,264 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-25 17:59:18,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 113 treesize of output 103 [2021-11-25 17:59:18,561 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:18,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701121518] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:18,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1597142872] [2021-11-25 17:59:18,564 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 17:59:18,564 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:18,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:18,565 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:18,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:18,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:18,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:18,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:18,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:18,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:18,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:18,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:18,891 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 17:59:18,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 17:59:19,124 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:59:21,101 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2364#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 17:59:21,102 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:59:21,102 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:59:21,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 35 [2021-11-25 17:59:21,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784478767] [2021-11-25 17:59:21,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:59:21,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 17:59:21,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:21,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 17:59:21,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1740, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 17:59:21,105 INFO L87 Difference]: Start difference. First operand 48 states and 58 transitions. Second operand has 35 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 35 states have internal predecessors, (45), 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) [2021-11-25 17:59:24,385 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (< (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 1)) (.cse1 (select |c_#length| |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (and (<= (+ |c_ULTIMATE.start_main_~length2~0#1| |c_ULTIMATE.start_main_~n~0#1|) |c_ULTIMATE.start_main_~length1~0#1|) (or .cse0 (= |c_ULTIMATE.start_main_~length1~0#1| (+ |c_ULTIMATE.start_main_~n~0#1| 1)) (= |c_ULTIMATE.start_main_~length1~0#1| (+ 2 |c_ULTIMATE.start_main_~n~0#1|))) (<= (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2) .cse1) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |c_ULTIMATE.start_main_~i~0#1|) (<= |c_ULTIMATE.start_main_~i~0#1| 2) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |c_ULTIMATE.start_main_~n~0#1|) (or .cse0 (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int)) (let ((.cse2 (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (= (select .cse2 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|) 0) (= (select .cse2 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0))))) (or (= |c_ULTIMATE.start_main_~length2~0#1| .cse1) (and (= |c_ULTIMATE.start_main_~length1~0#1| .cse1) (<= 3 |c_ULTIMATE.start_main_~length1~0#1|))))) is different from false [2021-11-25 17:59:24,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:24,635 INFO L93 Difference]: Finished difference Result 82 states and 101 transitions. [2021-11-25 17:59:24,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 17:59:24,636 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 35 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-25 17:59:24,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:24,636 INFO L225 Difference]: With dead ends: 82 [2021-11-25 17:59:24,637 INFO L226 Difference]: Without dead ends: 82 [2021-11-25 17:59:24,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 941 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=452, Invalid=4107, Unknown=1, NotChecked=132, Total=4692 [2021-11-25 17:59:24,640 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 113 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 135 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:24,640 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 205 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 435 Invalid, 0 Unknown, 135 Unchecked, 0.3s Time] [2021-11-25 17:59:24,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-25 17:59:24,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 67. [2021-11-25 17:59:24,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.3387096774193548) internal successors, (83), 66 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) [2021-11-25 17:59:24,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 83 transitions. [2021-11-25 17:59:24,643 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 83 transitions. Word has length 16 [2021-11-25 17:59:24,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:24,644 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 83 transitions. [2021-11-25 17:59:24,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 35 states have internal predecessors, (45), 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) [2021-11-25 17:59:24,644 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 83 transitions. [2021-11-25 17:59:24,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 17:59:24,645 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:24,645 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:24,684 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-25 17:59:24,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:24,861 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:24,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:24,862 INFO L85 PathProgramCache]: Analyzing trace with hash -1818758752, now seen corresponding path program 1 times [2021-11-25 17:59:24,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:24,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974552889] [2021-11-25 17:59:24,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:24,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:24,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:24,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:24,955 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:24,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974552889] [2021-11-25 17:59:24,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974552889] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:24,955 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:59:24,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 17:59:24,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997113374] [2021-11-25 17:59:24,956 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:24,956 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:59:24,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:24,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:59:24,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:59:24,957 INFO L87 Difference]: Start difference. First operand 67 states and 83 transitions. Second operand has 4 states, 3 states have (on average 6.0) internal successors, (18), 3 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) [2021-11-25 17:59:24,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:24,980 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2021-11-25 17:59:24,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:59:24,980 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-25 17:59:24,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:24,981 INFO L225 Difference]: With dead ends: 66 [2021-11-25 17:59:24,981 INFO L226 Difference]: Without dead ends: 63 [2021-11-25 17:59:24,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:59:24,982 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 10 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:24,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 26 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:59:24,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-25 17:59:24,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-25 17:59:24,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 59 states have (on average 1.2881355932203389) internal successors, (76), 62 states have internal predecessors, (76), 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) [2021-11-25 17:59:24,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2021-11-25 17:59:24,984 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 18 [2021-11-25 17:59:24,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:24,985 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2021-11-25 17:59:24,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 6.0) internal successors, (18), 3 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) [2021-11-25 17:59:24,985 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2021-11-25 17:59:24,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 17:59:24,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:24,986 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:24,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-25 17:59:24,986 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:24,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:24,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1817780669, now seen corresponding path program 1 times [2021-11-25 17:59:24,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:24,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947940877] [2021-11-25 17:59:24,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:24,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:25,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:25,128 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:25,128 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:25,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947940877] [2021-11-25 17:59:25,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947940877] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:25,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820786827] [2021-11-25 17:59:25,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:25,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:25,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:25,130 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:25,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 17:59:25,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:25,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-25 17:59:25,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:25,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:25,463 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:59:25,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2021-11-25 17:59:25,575 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:25,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:25,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2021-11-25 17:59:25,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 15 treesize of output 11 [2021-11-25 17:59:25,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 18 [2021-11-25 17:59:25,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:25,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [820786827] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:25,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1805747746] [2021-11-25 17:59:25,868 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 17:59:25,868 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:25,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:25,868 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:25,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:25,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:25,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:25,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:25,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:26,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:26,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:26,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:26,164 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 17:59:26,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 17:59:26,330 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:26,332 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:26,332 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:26,333 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:26,358 INFO L354 Elim1Store]: treesize reduction 96, result has 20.0 percent of original size [2021-11-25 17:59:26,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 8 case distinctions, treesize of input 49 treesize of output 43 [2021-11-25 17:59:26,462 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:26,479 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:26,480 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:26,481 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:26,507 INFO L354 Elim1Store]: treesize reduction 96, result has 20.0 percent of original size [2021-11-25 17:59:26,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 8 case distinctions, treesize of input 49 treesize of output 43 [2021-11-25 17:59:26,536 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:59:29,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1805747746] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:29,338 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:59:29,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [8, 8, 8] total 34 [2021-11-25 17:59:29,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482672194] [2021-11-25 17:59:29,338 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:29,338 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 17:59:29,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:29,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 17:59:29,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=941, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 17:59:29,340 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand has 14 states, 14 states have (on average 1.2142857142857142) 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) [2021-11-25 17:59:29,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:29,537 INFO L93 Difference]: Finished difference Result 100 states and 116 transitions. [2021-11-25 17:59:29,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 17:59:29,538 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.2142857142857142) 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) Word has length 18 [2021-11-25 17:59:29,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:29,538 INFO L225 Difference]: With dead ends: 100 [2021-11-25 17:59:29,538 INFO L226 Difference]: Without dead ends: 91 [2021-11-25 17:59:29,539 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=181, Invalid=941, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 17:59:29,540 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 72 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:29,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 46 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:59:29,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-25 17:59:29,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 70. [2021-11-25 17:59:29,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 66 states have (on average 1.2575757575757576) internal successors, (83), 69 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) [2021-11-25 17:59:29,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 83 transitions. [2021-11-25 17:59:29,543 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 83 transitions. Word has length 18 [2021-11-25 17:59:29,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:29,543 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 83 transitions. [2021-11-25 17:59:29,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.2142857142857142) 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) [2021-11-25 17:59:29,544 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 83 transitions. [2021-11-25 17:59:29,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 17:59:29,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:29,545 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:29,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:29,757 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:29,757 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:29,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:29,758 INFO L85 PathProgramCache]: Analyzing trace with hash 1599698958, now seen corresponding path program 1 times [2021-11-25 17:59:29,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:29,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768369136] [2021-11-25 17:59:29,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:29,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:29,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:29,879 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:29,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:29,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768369136] [2021-11-25 17:59:29,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768369136] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:29,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893210256] [2021-11-25 17:59:29,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:29,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:29,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:29,881 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:29,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 17:59:29,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:29,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 17:59:29,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:29,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:29,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:29,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:59:30,240 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:30,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:30,537 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:30,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893210256] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:30,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1110430032] [2021-11-25 17:59:30,538 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-25 17:59:30,538 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:30,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:30,539 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:30,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:30,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:30,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:30,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:30,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:30,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:30,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:30,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:30,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:30,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:30,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:31,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:31,084 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 17:59:31,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 17:59:31,315 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:59:33,076 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3153#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 17:59:33,077 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:59:33,077 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:59:33,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 27 [2021-11-25 17:59:33,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227289167] [2021-11-25 17:59:33,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:59:33,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 17:59:33,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:33,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 17:59:33,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1256, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 17:59:33,079 INFO L87 Difference]: Start difference. First operand 70 states and 83 transitions. Second operand has 28 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 28 states have internal predecessors, (58), 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) [2021-11-25 17:59:34,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:34,045 INFO L93 Difference]: Finished difference Result 146 states and 162 transitions. [2021-11-25 17:59:34,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 17:59:34,045 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 28 states have internal predecessors, (58), 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 20 [2021-11-25 17:59:34,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:34,046 INFO L225 Difference]: With dead ends: 146 [2021-11-25 17:59:34,046 INFO L226 Difference]: Without dead ends: 143 [2021-11-25 17:59:34,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=494, Invalid=2476, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 17:59:34,048 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 380 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 380 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:34,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [380 Valid, 214 Invalid, 709 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 610 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:59:34,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-25 17:59:34,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 84. [2021-11-25 17:59:34,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 80 states have (on average 1.25) internal successors, (100), 83 states have internal predecessors, (100), 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) [2021-11-25 17:59:34,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 100 transitions. [2021-11-25 17:59:34,052 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 100 transitions. Word has length 20 [2021-11-25 17:59:34,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:34,053 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 100 transitions. [2021-11-25 17:59:34,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 28 states have internal predecessors, (58), 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) [2021-11-25 17:59:34,053 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 100 transitions. [2021-11-25 17:59:34,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 17:59:34,054 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:34,054 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:34,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:34,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:34,281 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:34,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:34,282 INFO L85 PathProgramCache]: Analyzing trace with hash 1458539638, now seen corresponding path program 1 times [2021-11-25 17:59:34,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:34,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343238148] [2021-11-25 17:59:34,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:34,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:34,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:34,337 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 17:59:34,337 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:34,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343238148] [2021-11-25 17:59:34,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343238148] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:34,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351095415] [2021-11-25 17:59:34,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:34,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:34,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:34,344 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:34,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 17:59:34,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:34,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 17:59:34,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:34,561 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:34,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:34,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:34,716 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:34,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351095415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:34,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1208247708] [2021-11-25 17:59:34,718 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 17:59:34,719 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:34,719 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:34,719 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:34,719 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:34,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:34,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:34,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:34,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:34,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:34,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:34,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:35,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:35,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:35,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:35,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:35,233 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 17:59:35,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 17:59:35,472 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:35,474 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:35,476 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:35,527 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-25 17:59:35,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-25 17:59:35,745 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 17:59:35,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 17:59:35,939 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 17:59:35,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 17:59:36,064 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:59:39,185 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3559#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (< (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 17:59:39,185 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:59:39,185 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:59:39,185 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 8] total 18 [2021-11-25 17:59:39,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090053531] [2021-11-25 17:59:39,186 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:59:39,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-25 17:59:39,186 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:39,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-25 17:59:39,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=966, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 17:59:39,187 INFO L87 Difference]: Start difference. First operand 84 states and 100 transitions. Second operand has 18 states, 18 states have (on average 2.7777777777777777) internal successors, (50), 18 states have internal predecessors, (50), 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) [2021-11-25 17:59:39,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:39,604 INFO L93 Difference]: Finished difference Result 138 states and 156 transitions. [2021-11-25 17:59:39,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 17:59:39,604 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.7777777777777777) internal successors, (50), 18 states have internal predecessors, (50), 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 20 [2021-11-25 17:59:39,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:39,605 INFO L225 Difference]: With dead ends: 138 [2021-11-25 17:59:39,605 INFO L226 Difference]: Without dead ends: 137 [2021-11-25 17:59:39,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 436 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=296, Invalid=1866, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 17:59:39,606 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 116 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:39,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 101 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 346 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:59:39,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-25 17:59:39,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 102. [2021-11-25 17:59:39,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 98 states have (on average 1.2244897959183674) internal successors, (120), 101 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) [2021-11-25 17:59:39,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 120 transitions. [2021-11-25 17:59:39,610 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 120 transitions. Word has length 20 [2021-11-25 17:59:39,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:39,611 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 120 transitions. [2021-11-25 17:59:39,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.7777777777777777) internal successors, (50), 18 states have internal predecessors, (50), 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) [2021-11-25 17:59:39,611 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 120 transitions. [2021-11-25 17:59:39,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 17:59:39,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:39,612 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:39,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:39,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-25 17:59:39,817 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:39,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:39,818 INFO L85 PathProgramCache]: Analyzing trace with hash 724948109, now seen corresponding path program 4 times [2021-11-25 17:59:39,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:39,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252971998] [2021-11-25 17:59:39,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:39,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:39,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:40,511 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:40,511 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:40,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252971998] [2021-11-25 17:59:40,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252971998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:40,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190640657] [2021-11-25 17:59:40,511 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 17:59:40,512 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:40,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:40,517 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:40,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 17:59:40,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:40,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-25 17:59:40,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:40,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:59:40,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 17:59:40,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 17:59:41,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:41,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:41,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:41,453 INFO L354 Elim1Store]: treesize reduction 31, result has 34.0 percent of original size [2021-11-25 17:59:41,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 41 treesize of output 30 [2021-11-25 17:59:41,464 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:41,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:41,727 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:59:41,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 49 [2021-11-25 17:59:41,732 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:41,732 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:41,733 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:41,744 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:59:41,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 86 treesize of output 106 [2021-11-25 17:59:41,749 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:41,749 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:41,750 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:41,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 22 [2021-11-25 17:59:42,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:59:42,273 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:42,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190640657] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:42,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1666642728] [2021-11-25 17:59:42,275 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 17:59:42,275 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:42,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:42,276 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:42,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:42,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:42,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:42,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:42,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:42,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:42,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:42,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:42,560 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 17:59:42,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 17:59:42,756 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:59:44,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4007#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 17:59:44,628 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:59:44,628 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:59:44,628 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 39 [2021-11-25 17:59:44,628 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743394205] [2021-11-25 17:59:44,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:59:44,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 17:59:44,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:44,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 17:59:44,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2152, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 17:59:44,630 INFO L87 Difference]: Start difference. First operand 102 states and 120 transitions. Second operand has 40 states, 40 states have (on average 1.375) internal successors, (55), 39 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) [2021-11-25 17:59:45,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:45,999 INFO L93 Difference]: Finished difference Result 126 states and 150 transitions. [2021-11-25 17:59:46,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 17:59:46,007 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.375) internal successors, (55), 39 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 22 [2021-11-25 17:59:46,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:46,008 INFO L225 Difference]: With dead ends: 126 [2021-11-25 17:59:46,008 INFO L226 Difference]: Without dead ends: 126 [2021-11-25 17:59:46,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 894 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=359, Invalid=3181, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 17:59:46,010 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 73 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:46,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 180 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 171 Invalid, 0 Unknown, 112 Unchecked, 0.1s Time] [2021-11-25 17:59:46,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-25 17:59:46,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 119. [2021-11-25 17:59:46,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 115 states have (on average 1.2347826086956522) internal successors, (142), 118 states have internal predecessors, (142), 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) [2021-11-25 17:59:46,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 142 transitions. [2021-11-25 17:59:46,014 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 142 transitions. Word has length 22 [2021-11-25 17:59:46,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:46,015 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 142 transitions. [2021-11-25 17:59:46,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.375) internal successors, (55), 39 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) [2021-11-25 17:59:46,015 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 142 transitions. [2021-11-25 17:59:46,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 17:59:46,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:46,016 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:46,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:46,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 17:59:46,221 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:46,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:46,222 INFO L85 PathProgramCache]: Analyzing trace with hash 80499577, now seen corresponding path program 1 times [2021-11-25 17:59:46,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:46,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372726336] [2021-11-25 17:59:46,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:46,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:46,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:46,617 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:46,617 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:46,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372726336] [2021-11-25 17:59:46,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372726336] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:46,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443452888] [2021-11-25 17:59:46,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:46,617 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:46,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:46,621 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:46,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 17:59:46,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:46,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 17:59:46,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:46,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:47,106 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:47,108 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:59:47,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2021-11-25 17:59:47,137 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 17:59:47,137 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:59:47,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443452888] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:59:47,137 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:59:47,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [12] total 20 [2021-11-25 17:59:47,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125615628] [2021-11-25 17:59:47,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:59:47,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:59:47,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:47,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:59:47,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2021-11-25 17:59:47,140 INFO L87 Difference]: Start difference. First operand 119 states and 142 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 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) [2021-11-25 17:59:47,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:47,204 INFO L93 Difference]: Finished difference Result 135 states and 154 transitions. [2021-11-25 17:59:47,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:59:47,204 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-25 17:59:47,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:47,205 INFO L225 Difference]: With dead ends: 135 [2021-11-25 17:59:47,205 INFO L226 Difference]: Without dead ends: 109 [2021-11-25 17:59:47,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-11-25 17:59:47,206 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 15 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:47,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 88 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 51 Unchecked, 0.0s Time] [2021-11-25 17:59:47,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-25 17:59:47,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 105. [2021-11-25 17:59:47,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 101 states have (on average 1.2079207920792079) internal successors, (122), 104 states have internal predecessors, (122), 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) [2021-11-25 17:59:47,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 122 transitions. [2021-11-25 17:59:47,210 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 122 transitions. Word has length 22 [2021-11-25 17:59:47,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:47,211 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 122 transitions. [2021-11-25 17:59:47,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 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) [2021-11-25 17:59:47,211 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 122 transitions. [2021-11-25 17:59:47,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 17:59:47,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:47,212 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:47,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:47,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:47,421 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:47,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:47,422 INFO L85 PathProgramCache]: Analyzing trace with hash 1214436490, now seen corresponding path program 5 times [2021-11-25 17:59:47,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:47,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857722588] [2021-11-25 17:59:47,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:47,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:47,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:47,616 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:47,617 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:47,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857722588] [2021-11-25 17:59:47,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857722588] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:47,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475619969] [2021-11-25 17:59:47,617 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:59:47,617 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:47,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:47,621 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:47,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 17:59:47,748 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 17:59:47,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:59:47,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 17:59:47,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:47,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:47,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:47,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:59:48,053 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 9 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:48,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:48,438 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:48,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475619969] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:48,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2026862384] [2021-11-25 17:59:48,440 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 17:59:48,440 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:48,440 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:48,440 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:48,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:48,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:48,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:48,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:48,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:48,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:48,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:48,650 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 17:59:48,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 17:59:49,042 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:59:51,226 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4786#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 17:59:51,227 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:59:51,227 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:59:51,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 37 [2021-11-25 17:59:51,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506680274] [2021-11-25 17:59:51,227 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:59:51,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 17:59:51,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:51,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 17:59:51,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=2008, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 17:59:51,229 INFO L87 Difference]: Start difference. First operand 105 states and 122 transitions. Second operand has 38 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 38 states have internal predecessors, (70), 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) [2021-11-25 17:59:51,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:51,951 INFO L93 Difference]: Finished difference Result 206 states and 228 transitions. [2021-11-25 17:59:51,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 17:59:51,952 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 38 states have internal predecessors, (70), 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 24 [2021-11-25 17:59:51,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:51,953 INFO L225 Difference]: With dead ends: 206 [2021-11-25 17:59:51,954 INFO L226 Difference]: Without dead ends: 205 [2021-11-25 17:59:51,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=527, Invalid=2895, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 17:59:51,956 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 363 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 774 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 363 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 863 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:51,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [363 Valid, 287 Invalid, 863 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 774 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:59:51,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-25 17:59:51,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 121. [2021-11-25 17:59:51,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 117 states have (on average 1.1965811965811965) internal successors, (140), 120 states have internal predecessors, (140), 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) [2021-11-25 17:59:51,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 140 transitions. [2021-11-25 17:59:51,966 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 140 transitions. Word has length 24 [2021-11-25 17:59:51,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:51,966 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 140 transitions. [2021-11-25 17:59:51,967 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 38 states have internal predecessors, (70), 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) [2021-11-25 17:59:51,967 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 140 transitions. [2021-11-25 17:59:51,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 17:59:51,968 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:51,968 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:51,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:52,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 17:59:52,173 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 17:59:52,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:52,174 INFO L85 PathProgramCache]: Analyzing trace with hash -1157636925, now seen corresponding path program 6 times [2021-11-25 17:59:52,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:52,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439048964] [2021-11-25 17:59:52,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:52,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:52,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:52,713 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 14 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:59:52,714 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:59:52,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439048964] [2021-11-25 17:59:52,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1439048964] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:52,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723220068] [2021-11-25 17:59:52,714 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 17:59:52,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:52,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:52,719 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:52,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 17:59:52,819 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 17:59:52,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:59:52,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 17:59:52,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:52,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 18 treesize of output 16 [2021-11-25 17:59:52,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:53,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 17:59:53,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 17:59:54,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:54,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:54,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:54,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:54,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:54,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:54,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:54,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:54,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:54,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:54,202 INFO L354 Elim1Store]: treesize reduction 40, result has 49.4 percent of original size [2021-11-25 17:59:54,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 5 case distinctions, treesize of input 61 treesize of output 61 [2021-11-25 17:59:54,228 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 21 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:54,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:54,940 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:59:54,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 129 treesize of output 73 [2021-11-25 17:59:54,946 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,947 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,947 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,948 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,952 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,952 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,952 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,971 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:59:54,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 5 case distinctions, treesize of input 136 treesize of output 176 [2021-11-25 17:59:54,982 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,982 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,982 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,983 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,983 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,984 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,984 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,984 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,985 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,985 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:54,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 36 [2021-11-25 17:59:56,976 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 21 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:59:56,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [723220068] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:56,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [965158881] [2021-11-25 17:59:56,977 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 17:59:56,977 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:59:56,977 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:59:56,977 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:59:56,978 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:59:57,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:57,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:57,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:59:57,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:57,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 17:59:57,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 17:59:57,175 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 17:59:57,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 17:59:57,524 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:00:00,038 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5348#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:00:00,038 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:00:00,038 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:00:00,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 20, 20] total 53 [2021-11-25 18:00:00,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884854774] [2021-11-25 18:00:00,039 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:00,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 18:00:00,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:00:00,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 18:00:00,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=3562, Unknown=16, NotChecked=0, Total=3906 [2021-11-25 18:00:00,041 INFO L87 Difference]: Start difference. First operand 121 states and 140 transitions. Second operand has 53 states, 53 states have (on average 1.3773584905660377) internal successors, (73), 53 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) [2021-11-25 18:00:01,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:00:01,443 INFO L93 Difference]: Finished difference Result 153 states and 178 transitions. [2021-11-25 18:00:01,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 18:00:01,443 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.3773584905660377) internal successors, (73), 53 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) Word has length 26 [2021-11-25 18:00:01,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:00:01,444 INFO L225 Difference]: With dead ends: 153 [2021-11-25 18:00:01,444 INFO L226 Difference]: Without dead ends: 142 [2021-11-25 18:00:01,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1626 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=649, Invalid=6307, Unknown=16, NotChecked=0, Total=6972 [2021-11-25 18:00:01,447 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 104 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:00:01,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 152 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 338 Invalid, 0 Unknown, 126 Unchecked, 0.2s Time] [2021-11-25 18:00:01,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-25 18:00:01,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 131. [2021-11-25 18:00:01,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 127 states have (on average 1.204724409448819) internal successors, (153), 130 states have internal predecessors, (153), 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) [2021-11-25 18:00:01,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 153 transitions. [2021-11-25 18:00:01,451 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 153 transitions. Word has length 26 [2021-11-25 18:00:01,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:00:01,451 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 153 transitions. [2021-11-25 18:00:01,451 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.3773584905660377) internal successors, (73), 53 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) [2021-11-25 18:00:01,451 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 153 transitions. [2021-11-25 18:00:01,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 18:00:01,452 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:00:01,452 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:00:01,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 18:00:01,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 18:00:01,652 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:00:01,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:00:01,653 INFO L85 PathProgramCache]: Analyzing trace with hash -1881611658, now seen corresponding path program 2 times [2021-11-25 18:00:01,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:00:01,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157794092] [2021-11-25 18:00:01,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:01,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:00:01,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:01,864 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:00:01,865 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:00:01,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157794092] [2021-11-25 18:00:01,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157794092] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:00:01,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577176490] [2021-11-25 18:00:01,865 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:00:01,866 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:01,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:00:01,866 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:00:01,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 18:00:01,981 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:00:01,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:00:01,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-25 18:00:01,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:02,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2021-11-25 18:00:02,393 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-25 18:00:02,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 32 treesize of output 42 [2021-11-25 18:00:02,420 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:02,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:02,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 10 [2021-11-25 18:00:02,583 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:02,585 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:00:02,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 14 [2021-11-25 18:00:02,610 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:00:02,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:02,695 WARN L838 $PredicateComparison]: unable to prove that (or (= |c_ULTIMATE.start_cstrncat_#t~mem6#1| 0) (forall ((v_ArrVal_596 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_596) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |c_ULTIMATE.start_cstrncat_~s~0#1.offset|) 0))) is different from false [2021-11-25 18:00:02,936 INFO L354 Elim1Store]: treesize reduction 16, result has 66.7 percent of original size [2021-11-25 18:00:02,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 69 treesize of output 85 [2021-11-25 18:00:02,956 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:00:02,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 51 [2021-11-25 18:00:02,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 11 treesize of output 7 [2021-11-25 18:00:03,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 6 treesize of output 4 [2021-11-25 18:00:03,026 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:03,033 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:00:03,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 67 treesize of output 77 [2021-11-25 18:00:03,397 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2021-11-25 18:00:03,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577176490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:03,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1509950418] [2021-11-25 18:00:03,402 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:00:03,402 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:00:03,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:00:03,402 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:00:03,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:00:03,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:03,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:03,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:00:03,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:03,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:03,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:03,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:03,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 18:00:03,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:03,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:03,773 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:00:03,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:00:03,913 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:00:03,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 211 treesize of output 227 [2021-11-25 18:00:04,665 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:04,667 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:04,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:04,754 INFO L354 Elim1Store]: treesize reduction 247, result has 19.0 percent of original size [2021-11-25 18:00:04,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 14 case distinctions, treesize of input 718 treesize of output 725 [2021-11-25 18:00:05,342 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:00:05,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:00:05,517 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:00:05,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:00:05,654 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:00:10,425 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5880#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (< (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:00:10,426 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:00:10,426 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:00:10,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 17, 17] total 39 [2021-11-25 18:00:10,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877967901] [2021-11-25 18:00:10,426 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:10,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 18:00:10,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:00:10,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 18:00:10,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=2732, Unknown=1, NotChecked=106, Total=3080 [2021-11-25 18:00:10,429 INFO L87 Difference]: Start difference. First operand 131 states and 153 transitions. Second operand has 40 states, 40 states have (on average 1.75) internal successors, (70), 39 states have internal predecessors, (70), 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) [2021-11-25 18:00:11,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:00:11,129 INFO L93 Difference]: Finished difference Result 138 states and 160 transitions. [2021-11-25 18:00:11,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 18:00:11,130 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.75) internal successors, (70), 39 states have internal predecessors, (70), 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 27 [2021-11-25 18:00:11,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:00:11,131 INFO L225 Difference]: With dead ends: 138 [2021-11-25 18:00:11,131 INFO L226 Difference]: Without dead ends: 133 [2021-11-25 18:00:11,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1200 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=411, Invalid=4562, Unknown=1, NotChecked=138, Total=5112 [2021-11-25 18:00:11,133 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 59 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:00:11,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 93 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 163 Invalid, 0 Unknown, 114 Unchecked, 0.1s Time] [2021-11-25 18:00:11,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-25 18:00:11,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-11-25 18:00:11,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 129 states have (on average 1.2015503875968991) internal successors, (155), 132 states have internal predecessors, (155), 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) [2021-11-25 18:00:11,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 155 transitions. [2021-11-25 18:00:11,137 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 155 transitions. Word has length 27 [2021-11-25 18:00:11,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:00:11,137 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 155 transitions. [2021-11-25 18:00:11,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.75) internal successors, (70), 39 states have internal predecessors, (70), 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) [2021-11-25 18:00:11,138 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 155 transitions. [2021-11-25 18:00:11,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 18:00:11,138 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:00:11,138 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:00:11,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 18:00:11,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 18:00:11,339 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:00:11,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:00:11,339 INFO L85 PathProgramCache]: Analyzing trace with hash 2038601280, now seen corresponding path program 7 times [2021-11-25 18:00:11,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:00:11,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854149754] [2021-11-25 18:00:11,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:11,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:00:11,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:11,561 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:00:11,561 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:00:11,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854149754] [2021-11-25 18:00:11,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854149754] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:00:11,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092769581] [2021-11-25 18:00:11,562 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:00:11,562 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:11,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:00:11,563 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:00:11,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 18:00:11,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:11,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 18:00:11,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:11,670 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 18:00:11,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 18:00:12,624 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 16 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:00:12,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:13,421 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 25 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:00:13,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092769581] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:13,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1191996768] [2021-11-25 18:00:13,423 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:00:13,423 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:00:13,423 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:00:13,423 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:00:13,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:00:13,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:13,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:13,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:00:13,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:13,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:13,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:00:13,603 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:00:13,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:00:13,910 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:00:16,358 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6411#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:00:16,358 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:00:16,358 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:00:16,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18, 18] total 49 [2021-11-25 18:00:16,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001915503] [2021-11-25 18:00:16,359 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:16,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-25 18:00:16,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:00:16,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-25 18:00:16,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=3221, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 18:00:16,361 INFO L87 Difference]: Start difference. First operand 133 states and 155 transitions. Second operand has 50 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 50 states have internal predecessors, (82), 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) [2021-11-25 18:00:16,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:00:16,915 INFO L93 Difference]: Finished difference Result 135 states and 157 transitions. [2021-11-25 18:00:16,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 18:00:16,916 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 50 states have internal predecessors, (82), 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 28 [2021-11-25 18:00:16,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:00:16,916 INFO L225 Difference]: With dead ends: 135 [2021-11-25 18:00:16,917 INFO L226 Difference]: Without dead ends: 135 [2021-11-25 18:00:16,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1224 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=483, Invalid=4487, Unknown=0, NotChecked=0, Total=4970 [2021-11-25 18:00:16,919 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 10 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 238 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:00:16,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 119 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 273 Invalid, 0 Unknown, 238 Unchecked, 0.1s Time] [2021-11-25 18:00:16,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-25 18:00:16,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-11-25 18:00:16,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 131 states have (on average 1.1984732824427482) internal successors, (157), 134 states have internal predecessors, (157), 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) [2021-11-25 18:00:16,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 157 transitions. [2021-11-25 18:00:16,923 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 157 transitions. Word has length 28 [2021-11-25 18:00:16,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:00:16,924 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 157 transitions. [2021-11-25 18:00:16,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 50 states have internal predecessors, (82), 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) [2021-11-25 18:00:16,924 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 157 transitions. [2021-11-25 18:00:16,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 18:00:16,925 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:00:16,925 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:00:16,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 18:00:17,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:17,141 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:00:17,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:00:17,142 INFO L85 PathProgramCache]: Analyzing trace with hash -1020966952, now seen corresponding path program 1 times [2021-11-25 18:00:17,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:00:17,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240938379] [2021-11-25 18:00:17,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:17,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:00:17,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:17,444 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:00:17,445 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:00:17,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240938379] [2021-11-25 18:00:17,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240938379] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:00:17,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1716877375] [2021-11-25 18:00:17,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:17,445 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:17,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:00:17,449 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:00:17,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 18:00:17,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:17,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-25 18:00:17,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:17,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:00:17,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 14 treesize of output 10 [2021-11-25 18:00:17,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 18:00:17,974 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-25 18:00:17,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2021-11-25 18:00:17,998 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:00:17,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:18,060 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_678 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_678) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |c_ULTIMATE.start_cstrncat_~s~0#1.offset|) 0)) is different from false [2021-11-25 18:00:18,067 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_678 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_678) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s~0#1.offset| 1)) 0)) is different from false [2021-11-25 18:00:18,097 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_678 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~dst#1.base| v_ArrVal_678) |c_ULTIMATE.start_cstrncat_~src#1.base|) (+ 1 |c_ULTIMATE.start_cstrncat_~src#1.offset|)) 0)) is different from false [2021-11-25 18:00:18,104 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:00:18,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 18:00:18,110 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:00:18,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 18:00:18,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 11 treesize of output 7 [2021-11-25 18:00:18,299 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 3 not checked. [2021-11-25 18:00:18,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1716877375] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:18,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206099117] [2021-11-25 18:00:18,301 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 18:00:18,301 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:00:18,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:00:18,301 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:00:18,301 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:00:18,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:18,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:18,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:00:18,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:18,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:18,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:18,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:18,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 18:00:18,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:18,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:18,665 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:00:18,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:00:18,810 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:00:18,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 211 treesize of output 227 [2021-11-25 18:00:19,176 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:00:19,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:00:19,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:19,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:19,298 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:00:19,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:00:19,470 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:00:19,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:00:19,618 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:00:19,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:00:19,796 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:00:23,949 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6915#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= |ULTIMATE.start_cstrncat_~d~0#1.offset| (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|)) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (= (mod |ULTIMATE.start_cstrncat_~n#1| 4294967296) 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483645) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_cstrncat_#t~post5#1.base_52| Int) (|v_ULTIMATE.start_cstrncat_#t~post5#1.offset_51| Int)) (and (<= (+ |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_51| 1) (select |#length| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_52|)) (<= 0 |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_51|) (= (select (select |#memory_int| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_52|) |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_51|) (select (select |#memory_int| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrncat_~d~0#1.offset|))) (<= 0 |v_ULTIMATE.start_cstrncat_#t~post5#1.base_52|) (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_52|) |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_51|) 0)) (= (select |#valid| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_52|) 1))) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (= (select |#valid| |ULTIMATE.start_cstrncat_~d~0#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:00:23,949 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:00:23,949 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:00:23,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13] total 34 [2021-11-25 18:00:23,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222609986] [2021-11-25 18:00:23,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:23,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 18:00:23,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:00:23,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 18:00:23,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=2029, Unknown=3, NotChecked=276, Total=2450 [2021-11-25 18:00:23,951 INFO L87 Difference]: Start difference. First operand 135 states and 157 transitions. Second operand has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 34 states have internal predecessors, (67), 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) [2021-11-25 18:00:25,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:00:25,289 INFO L93 Difference]: Finished difference Result 262 states and 290 transitions. [2021-11-25 18:00:25,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 18:00:25,289 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 34 states have internal predecessors, (67), 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 28 [2021-11-25 18:00:25,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:00:25,290 INFO L225 Difference]: With dead ends: 262 [2021-11-25 18:00:25,291 INFO L226 Difference]: Without dead ends: 195 [2021-11-25 18:00:25,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 75 ConstructedPredicates, 3 IntricatePredicates, 4 DeprecatedPredicates, 1268 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=367, Invalid=5043, Unknown=4, NotChecked=438, Total=5852 [2021-11-25 18:00:25,292 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 71 mSDsluCounter, 438 mSDsCounter, 0 mSdLazyCounter, 675 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 1029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 675 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 334 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:00:25,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 413 Invalid, 1029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 675 Invalid, 0 Unknown, 334 Unchecked, 0.4s Time] [2021-11-25 18:00:25,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-25 18:00:25,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 177. [2021-11-25 18:00:25,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 173 states have (on average 1.1734104046242775) internal successors, (203), 176 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:00:25,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 203 transitions. [2021-11-25 18:00:25,297 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 203 transitions. Word has length 28 [2021-11-25 18:00:25,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:00:25,298 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 203 transitions. [2021-11-25 18:00:25,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 34 states have internal predecessors, (67), 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) [2021-11-25 18:00:25,298 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 203 transitions. [2021-11-25 18:00:25,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 18:00:25,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:00:25,299 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:00:25,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 18:00:25,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:25,499 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:00:25,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:00:25,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1768163661, now seen corresponding path program 2 times [2021-11-25 18:00:25,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:00:25,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402408519] [2021-11-25 18:00:25,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:25,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:00:25,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:25,727 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 9 proven. 41 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:00:25,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:00:25,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402408519] [2021-11-25 18:00:25,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402408519] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:00:25,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416643768] [2021-11-25 18:00:25,728 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:00:25,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:25,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:00:25,733 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:00:25,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 18:00:25,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 18:00:25,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:00:25,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-25 18:00:25,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:25,895 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 18:00:25,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 18:00:26,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:27,456 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:00:27,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 22 [2021-11-25 18:00:27,577 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 16 proven. 34 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:00:27,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:28,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2021-11-25 18:00:28,670 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 25 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:00:28,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416643768] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:28,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [348613989] [2021-11-25 18:00:28,672 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-25 18:00:28,672 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:00:28,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:00:28,673 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:00:28,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:00:28,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:28,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:28,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:00:28,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:28,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:28,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:28,881 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:00:28,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:00:28,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:28,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:29,112 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:00:29,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:00:29,278 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:00:29,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 210 treesize of output 226 [2021-11-25 18:00:29,970 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:00:32,571 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7643#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:00:32,571 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:00:32,571 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:00:32,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 42 [2021-11-25 18:00:32,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454647560] [2021-11-25 18:00:32,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:32,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 18:00:32,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:00:32,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 18:00:32,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=2497, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 18:00:32,573 INFO L87 Difference]: Start difference. First operand 177 states and 203 transitions. Second operand has 43 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 43 states have internal predecessors, (88), 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) [2021-11-25 18:00:34,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:00:34,201 INFO L93 Difference]: Finished difference Result 289 states and 324 transitions. [2021-11-25 18:00:34,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 18:00:34,201 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 43 states have internal predecessors, (88), 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 30 [2021-11-25 18:00:34,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:00:34,202 INFO L225 Difference]: With dead ends: 289 [2021-11-25 18:00:34,202 INFO L226 Difference]: Without dead ends: 289 [2021-11-25 18:00:34,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 53 SyntacticMatches, 7 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=573, Invalid=4119, Unknown=0, NotChecked=0, Total=4692 [2021-11-25 18:00:34,204 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 281 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 192 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:00:34,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 252 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 310 Invalid, 0 Unknown, 192 Unchecked, 0.2s Time] [2021-11-25 18:00:34,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-25 18:00:34,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 181. [2021-11-25 18:00:34,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 177 states have (on average 1.1807909604519775) internal successors, (209), 180 states have internal predecessors, (209), 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) [2021-11-25 18:00:34,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 209 transitions. [2021-11-25 18:00:34,210 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 209 transitions. Word has length 30 [2021-11-25 18:00:34,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:00:34,211 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 209 transitions. [2021-11-25 18:00:34,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 43 states have internal predecessors, (88), 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) [2021-11-25 18:00:34,211 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 209 transitions. [2021-11-25 18:00:34,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 18:00:34,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:00:34,212 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:00:34,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 18:00:34,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-25 18:00:34,429 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:00:34,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:00:34,430 INFO L85 PathProgramCache]: Analyzing trace with hash 590743801, now seen corresponding path program 8 times [2021-11-25 18:00:34,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:00:34,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168941331] [2021-11-25 18:00:34,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:34,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:00:34,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:35,269 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 27 proven. 33 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:00:35,269 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:00:35,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168941331] [2021-11-25 18:00:35,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168941331] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:00:35,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752597851] [2021-11-25 18:00:35,269 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:00:35,269 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:35,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:00:35,270 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:00:35,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 18:00:35,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 18:00:35,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:00:35,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-25 18:00:35,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:35,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:00:35,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 18:00:35,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 18:00:41,797 INFO L354 Elim1Store]: treesize reduction 163, result has 14.7 percent of original size [2021-11-25 18:00:41,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 61 treesize of output 50 [2021-11-25 18:00:41,806 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 24 proven. 29 refuted. 7 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:00:41,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:42,068 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:00:42,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 129 treesize of output 73 [2021-11-25 18:00:42,119 INFO L354 Elim1Store]: treesize reduction 140, result has 26.7 percent of original size [2021-11-25 18:00:42,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 136 treesize of output 148 [2021-11-25 18:00:42,134 INFO L354 Elim1Store]: treesize reduction 112, result has 0.9 percent of original size [2021-11-25 18:00:42,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 54 treesize of output 36 [2021-11-25 18:00:43,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:00:43,044 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 35 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:00:43,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752597851] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:43,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [52165674] [2021-11-25 18:00:43,046 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:00:43,046 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:00:43,046 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:00:43,047 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:00:43,047 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:00:43,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:43,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:43,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:00:43,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:43,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:43,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:00:43,234 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:00:43,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:00:43,558 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:00:46,086 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8389#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:00:46,086 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:00:46,087 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:00:46,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 50 [2021-11-25 18:00:46,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419659177] [2021-11-25 18:00:46,087 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:46,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-25 18:00:46,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:00:46,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-25 18:00:46,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=3348, Unknown=7, NotChecked=0, Total=3660 [2021-11-25 18:00:46,089 INFO L87 Difference]: Start difference. First operand 181 states and 209 transitions. Second operand has 51 states, 51 states have (on average 1.4313725490196079) internal successors, (73), 50 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) [2021-11-25 18:00:53,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:00:53,231 INFO L93 Difference]: Finished difference Result 240 states and 277 transitions. [2021-11-25 18:00:53,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-25 18:00:53,231 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.4313725490196079) internal successors, (73), 50 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) Word has length 30 [2021-11-25 18:00:53,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:00:53,232 INFO L225 Difference]: With dead ends: 240 [2021-11-25 18:00:53,233 INFO L226 Difference]: Without dead ends: 227 [2021-11-25 18:00:53,234 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 2079 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=674, Invalid=6287, Unknown=11, NotChecked=0, Total=6972 [2021-11-25 18:00:53,234 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 130 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 634 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 828 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 167 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:00:53,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 162 Invalid, 828 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 634 Invalid, 0 Unknown, 167 Unchecked, 0.3s Time] [2021-11-25 18:00:53,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-25 18:00:53,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 214. [2021-11-25 18:00:53,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 210 states have (on average 1.1857142857142857) internal successors, (249), 213 states have internal predecessors, (249), 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) [2021-11-25 18:00:53,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 249 transitions. [2021-11-25 18:00:53,240 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 249 transitions. Word has length 30 [2021-11-25 18:00:53,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:00:53,241 INFO L470 AbstractCegarLoop]: Abstraction has 214 states and 249 transitions. [2021-11-25 18:00:53,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.4313725490196079) internal successors, (73), 50 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) [2021-11-25 18:00:53,241 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 249 transitions. [2021-11-25 18:00:53,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 18:00:53,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:00:53,242 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:00:53,267 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-25 18:00:53,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:53,457 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:00:53,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:00:53,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1835093626, now seen corresponding path program 3 times [2021-11-25 18:00:53,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:00:53,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40154996] [2021-11-25 18:00:53,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:53,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:00:53,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:53,628 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:00:53,629 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:00:53,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40154996] [2021-11-25 18:00:53,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40154996] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:00:53,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370086640] [2021-11-25 18:00:53,630 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:00:53,630 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:53,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:00:53,633 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:00:53,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 18:00:53,766 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:00:53,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:00:53,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 18:00:53,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:53,925 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:00:53,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:54,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:54,123 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:00:54,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370086640] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:54,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [143448850] [2021-11-25 18:00:54,125 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:00:54,125 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:00:54,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:00:54,126 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:00:54,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:00:54,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:54,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:00:54,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:00:54,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:54,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:54,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:54,344 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:00:54,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:00:54,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:54,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:00:54,542 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:00:54,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:00:54,758 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:00:54,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 356 treesize of output 372 [2021-11-25 18:00:55,479 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:55,481 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:55,484 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:55,566 INFO L354 Elim1Store]: treesize reduction 247, result has 19.0 percent of original size [2021-11-25 18:00:55,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 14 case distinctions, treesize of input 712 treesize of output 719 [2021-11-25 18:00:55,971 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 33 iterations. Over-approximation may be very coarse. [2021-11-25 18:00:56,004 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 33 iterations. Over-approximation may be very coarse. [2021-11-25 18:00:56,012 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 33 iterations. Over-approximation may be very coarse. [2021-11-25 18:00:56,017 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 33 iterations. Over-approximation may be very coarse. [2021-11-25 18:00:56,020 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 33 iterations. Over-approximation may be very coarse. [2021-11-25 18:00:56,082 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:00:56,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:00:56,233 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:00:56,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:00:56,344 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 31 iterations. Over-approximation may be very coarse. [2021-11-25 18:00:56,364 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:01:00,663 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9104#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (< (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:01:00,663 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:01:00,663 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:01:00,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 23 [2021-11-25 18:01:00,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361036230] [2021-11-25 18:01:00,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:00,663 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 18:01:00,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:01:00,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 18:01:00,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1400, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 18:01:00,664 INFO L87 Difference]: Start difference. First operand 214 states and 249 transitions. Second operand has 24 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 24 states have internal predecessors, (59), 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) [2021-11-25 18:01:01,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:01:01,253 INFO L93 Difference]: Finished difference Result 246 states and 275 transitions. [2021-11-25 18:01:01,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 18:01:01,253 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 24 states have internal predecessors, (59), 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 [2021-11-25 18:01:01,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:01:01,254 INFO L225 Difference]: With dead ends: 246 [2021-11-25 18:01:01,255 INFO L226 Difference]: Without dead ends: 246 [2021-11-25 18:01:01,255 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=328, Invalid=2222, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 18:01:01,256 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 268 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 439 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:01:01,256 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [268 Valid, 117 Invalid, 468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 439 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:01:01,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2021-11-25 18:01:01,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 230. [2021-11-25 18:01:01,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 226 states have (on average 1.176991150442478) internal successors, (266), 229 states have internal predecessors, (266), 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) [2021-11-25 18:01:01,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 266 transitions. [2021-11-25 18:01:01,262 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 266 transitions. Word has length 31 [2021-11-25 18:01:01,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:01:01,262 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 266 transitions. [2021-11-25 18:01:01,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 24 states have internal predecessors, (59), 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) [2021-11-25 18:01:01,263 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 266 transitions. [2021-11-25 18:01:01,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 18:01:01,263 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:01:01,264 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:01:01,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:01,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:01,477 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:01:01,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:01:01,477 INFO L85 PathProgramCache]: Analyzing trace with hash 110476278, now seen corresponding path program 9 times [2021-11-25 18:01:01,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:01:01,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848634502] [2021-11-25 18:01:01,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:01,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:01:01,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:01,756 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 16 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:01:01,756 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:01:01,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848634502] [2021-11-25 18:01:01,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [848634502] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:01:01,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419120849] [2021-11-25 18:01:01,757 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:01:01,757 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:01,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:01:01,761 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:01:01,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 18:01:01,921 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:01:01,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:01:01,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 18:01:01,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:01,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:01,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:01:01,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 18 treesize of output 16 [2021-11-25 18:01:02,398 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 25 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:01:02,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:02,954 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 36 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:01:02,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419120849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:02,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [668506873] [2021-11-25 18:01:02,955 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:01:02,956 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:01:02,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:01:02,956 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:01:02,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:01:03,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:03,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:03,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:01:03,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:03,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:03,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:01:03,130 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:01:03,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:01:03,434 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:01:05,856 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9853#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:01:05,857 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:01:05,857 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:01:05,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 48 [2021-11-25 18:01:05,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21044118] [2021-11-25 18:01:05,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:05,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-25 18:01:05,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:01:05,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-25 18:01:05,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=3071, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 18:01:05,860 INFO L87 Difference]: Start difference. First operand 230 states and 266 transitions. Second operand has 49 states, 48 states have (on average 1.9583333333333333) internal successors, (94), 49 states have internal predecessors, (94), 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) [2021-11-25 18:01:07,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:01:07,253 INFO L93 Difference]: Finished difference Result 525 states and 580 transitions. [2021-11-25 18:01:07,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 18:01:07,253 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.9583333333333333) internal successors, (94), 49 states have internal predecessors, (94), 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 32 [2021-11-25 18:01:07,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:01:07,255 INFO L225 Difference]: With dead ends: 525 [2021-11-25 18:01:07,255 INFO L226 Difference]: Without dead ends: 507 [2021-11-25 18:01:07,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1523 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=872, Invalid=4828, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 18:01:07,256 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 543 mSDsluCounter, 696 mSDsCounter, 0 mSdLazyCounter, 1786 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 543 SdHoareTripleChecker+Valid, 660 SdHoareTripleChecker+Invalid, 1901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 1786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:01:07,256 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [543 Valid, 660 Invalid, 1901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 1786 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 18:01:07,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2021-11-25 18:01:07,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 270. [2021-11-25 18:01:07,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 266 states have (on average 1.1578947368421053) internal successors, (308), 269 states have internal predecessors, (308), 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) [2021-11-25 18:01:07,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 308 transitions. [2021-11-25 18:01:07,265 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 308 transitions. Word has length 32 [2021-11-25 18:01:07,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:01:07,266 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 308 transitions. [2021-11-25 18:01:07,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 1.9583333333333333) internal successors, (94), 49 states have internal predecessors, (94), 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) [2021-11-25 18:01:07,266 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 308 transitions. [2021-11-25 18:01:07,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 18:01:07,267 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:01:07,267 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:01:07,290 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:07,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-25 18:01:07,477 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:01:07,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:01:07,478 INFO L85 PathProgramCache]: Analyzing trace with hash -1376814378, now seen corresponding path program 1 times [2021-11-25 18:01:07,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:01:07,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118985444] [2021-11-25 18:01:07,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:07,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:01:07,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:07,541 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 18:01:07,541 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:01:07,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118985444] [2021-11-25 18:01:07,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1118985444] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:01:07,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501091223] [2021-11-25 18:01:07,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:07,542 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:07,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:01:07,553 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:01:07,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 18:01:07,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:07,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:01:07,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:07,787 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 18:01:07,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:07,888 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 18:01:07,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501091223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:07,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [236255290] [2021-11-25 18:01:07,890 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:01:07,890 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:01:07,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:01:07,891 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:01:07,891 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:01:07,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:07,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:07,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:01:07,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:08,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:08,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:08,110 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:01:08,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:01:08,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:08,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:08,277 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:01:08,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:01:08,458 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:01:08,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 356 treesize of output 372 [2021-11-25 18:01:09,241 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 32 iterations. Over-approximation may be very coarse. [2021-11-25 18:01:09,255 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 32 iterations. Over-approximation may be very coarse. [2021-11-25 18:01:09,363 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:01:09,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:01:09,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:09,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:09,489 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:01:09,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:01:09,656 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:01:09,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:01:09,802 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:01:09,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:01:09,919 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 31 iterations. Over-approximation may be very coarse. [2021-11-25 18:01:09,954 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:01:13,334 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10895#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post5#1.base|) 1) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrncat_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post5#1.base|) |ULTIMATE.start_cstrncat_#t~post5#1.offset|)) (<= (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:01:13,334 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:01:13,334 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:01:13,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2021-11-25 18:01:13,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181482236] [2021-11-25 18:01:13,335 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:13,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 18:01:13,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:01:13,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 18:01:13,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=839, Unknown=0, NotChecked=0, Total=992 [2021-11-25 18:01:13,336 INFO L87 Difference]: Start difference. First operand 270 states and 308 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 16 states have internal predecessors, (41), 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) [2021-11-25 18:01:13,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:01:13,451 INFO L93 Difference]: Finished difference Result 251 states and 287 transitions. [2021-11-25 18:01:13,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:01:13,456 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 16 states have internal predecessors, (41), 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 32 [2021-11-25 18:01:13,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:01:13,457 INFO L225 Difference]: With dead ends: 251 [2021-11-25 18:01:13,457 INFO L226 Difference]: Without dead ends: 248 [2021-11-25 18:01:13,458 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=227, Invalid=1255, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 18:01:13,458 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 70 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:01:13,459 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 26 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:01:13,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-11-25 18:01:13,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 248. [2021-11-25 18:01:13,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 244 states have (on average 1.1639344262295082) internal successors, (284), 247 states have internal predecessors, (284), 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) [2021-11-25 18:01:13,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 284 transitions. [2021-11-25 18:01:13,465 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 284 transitions. Word has length 32 [2021-11-25 18:01:13,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:01:13,465 INFO L470 AbstractCegarLoop]: Abstraction has 248 states and 284 transitions. [2021-11-25 18:01:13,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 16 states have internal predecessors, (41), 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) [2021-11-25 18:01:13,466 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 284 transitions. [2021-11-25 18:01:13,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 18:01:13,467 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:01:13,467 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:01:13,491 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:13,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-25 18:01:13,678 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:01:13,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:01:13,678 INFO L85 PathProgramCache]: Analyzing trace with hash -1206478545, now seen corresponding path program 10 times [2021-11-25 18:01:13,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:01:13,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974512531] [2021-11-25 18:01:13,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:13,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:01:13,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:14,608 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 38 proven. 46 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:01:14,609 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:01:14,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974512531] [2021-11-25 18:01:14,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1974512531] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:01:14,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459909067] [2021-11-25 18:01:14,609 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:01:14,609 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:14,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:01:14,610 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:01:14,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 18:01:14,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:14,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-25 18:01:14,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:14,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:01:15,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 18:01:15,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 18:01:16,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:16,501 INFO L354 Elim1Store]: treesize reduction 61, result has 35.8 percent of original size [2021-11-25 18:01:16,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 15 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 71 treesize of output 60 [2021-11-25 18:01:16,522 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 18 proven. 66 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:01:16,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:16,802 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_947 (Array Int Int))) (let ((.cse0 (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_947) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 5)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 4)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0) (= (select .cse0 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|) 0)))) is different from false [2021-11-25 18:01:16,820 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:01:16,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 155 treesize of output 85 [2021-11-25 18:01:16,829 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,830 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,830 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,831 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,831 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,832 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,832 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,833 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,833 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,834 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,834 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,835 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,835 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,836 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,836 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,864 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:01:16,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 15 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 161 treesize of output 211 [2021-11-25 18:01:16,877 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,877 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,878 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,878 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,879 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,879 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,881 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,881 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,882 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,882 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,883 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,883 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,883 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:16,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 43 [2021-11-25 18:01:18,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:01:18,058 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 48 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:01:18,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459909067] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:18,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [39877828] [2021-11-25 18:01:18,059 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:01:18,059 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:01:18,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:01:18,059 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:01:18,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:01:18,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:18,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:18,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:01:18,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:18,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:18,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:01:18,284 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:01:18,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:01:18,607 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:01:21,333 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11681#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:01:21,334 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:01:21,334 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:01:21,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 59 [2021-11-25 18:01:21,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837543048] [2021-11-25 18:01:21,334 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:21,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-25 18:01:21,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:01:21,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-25 18:01:21,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=4356, Unknown=1, NotChecked=134, Total=4830 [2021-11-25 18:01:21,339 INFO L87 Difference]: Start difference. First operand 248 states and 284 transitions. Second operand has 60 states, 60 states have (on average 1.3833333333333333) internal successors, (83), 59 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) [2021-11-25 18:01:25,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:01:25,924 INFO L93 Difference]: Finished difference Result 525 states and 583 transitions. [2021-11-25 18:01:25,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-25 18:01:25,924 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.3833333333333333) internal successors, (83), 59 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 34 [2021-11-25 18:01:25,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:01:25,927 INFO L225 Difference]: With dead ends: 525 [2021-11-25 18:01:25,927 INFO L226 Difference]: Without dead ends: 495 [2021-11-25 18:01:25,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 3405 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=1127, Invalid=11986, Unknown=1, NotChecked=226, Total=13340 [2021-11-25 18:01:25,929 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 656 mSDsluCounter, 1003 mSDsCounter, 0 mSdLazyCounter, 1226 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 656 SdHoareTripleChecker+Valid, 865 SdHoareTripleChecker+Invalid, 1999 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 1226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 591 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:01:25,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [656 Valid, 865 Invalid, 1999 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 1226 Invalid, 0 Unknown, 591 Unchecked, 0.7s Time] [2021-11-25 18:01:25,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2021-11-25 18:01:25,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 262. [2021-11-25 18:01:25,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 258 states have (on average 1.1705426356589148) internal successors, (302), 261 states have internal predecessors, (302), 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) [2021-11-25 18:01:25,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 302 transitions. [2021-11-25 18:01:25,939 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 302 transitions. Word has length 34 [2021-11-25 18:01:25,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:01:25,939 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 302 transitions. [2021-11-25 18:01:25,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.3833333333333333) internal successors, (83), 59 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) [2021-11-25 18:01:25,939 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 302 transitions. [2021-11-25 18:01:25,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 18:01:25,940 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:01:25,940 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:01:25,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:26,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:26,149 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:01:26,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:01:26,149 INFO L85 PathProgramCache]: Analyzing trace with hash -1877983743, now seen corresponding path program 2 times [2021-11-25 18:01:26,150 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:01:26,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813410020] [2021-11-25 18:01:26,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:26,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:01:26,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:26,466 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:01:26,466 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:01:26,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813410020] [2021-11-25 18:01:26,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813410020] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:01:26,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072832032] [2021-11-25 18:01:26,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:01:26,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:26,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:01:26,468 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:01:26,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 18:01:26,619 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:01:26,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:01:26,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-25 18:01:26,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:26,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:26,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:01:26,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:01:27,195 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:01:27,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:27,988 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:28,028 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:01:28,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072832032] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:28,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [86606665] [2021-11-25 18:01:28,029 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 18:01:28,029 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:01:28,030 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:01:28,030 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:01:28,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:01:28,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:28,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:28,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:01:28,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:28,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:28,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:28,282 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:01:28,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:01:28,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:28,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:28,498 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:01:28,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:01:28,659 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:01:28,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 211 treesize of output 227 [2021-11-25 18:01:29,042 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:01:29,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:01:29,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:29,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:29,192 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:01:29,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:01:29,367 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:01:29,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:01:29,505 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:01:29,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:01:29,722 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:01:34,296 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12816#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (exists ((|v_ULTIMATE.start_cstrncat_#t~post5#1.offset_83| Int) (|v_ULTIMATE.start_cstrncat_#t~post5#1.base_84| Int)) (and (<= 0 |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_83|) (= (select (select |#memory_int| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_84|) |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_83|) (select (select |#memory_int| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrncat_~d~0#1.offset|))) (<= 0 |v_ULTIMATE.start_cstrncat_#t~post5#1.base_84|) (= (select |#valid| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_84|) 1) (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_84|) |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_83|) 0)) (<= (+ |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_83| 1) (select |#length| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_84|)))) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= |ULTIMATE.start_cstrncat_~d~0#1.offset| (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|)) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (= (mod |ULTIMATE.start_cstrncat_~n#1| 4294967296) 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483645) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (= (select |#valid| |ULTIMATE.start_cstrncat_~d~0#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:01:34,296 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:01:34,296 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:01:34,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 13] total 43 [2021-11-25 18:01:34,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464596382] [2021-11-25 18:01:34,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:34,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 18:01:34,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:01:34,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 18:01:34,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=3253, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 18:01:34,298 INFO L87 Difference]: Start difference. First operand 262 states and 302 transitions. Second operand has 44 states, 43 states have (on average 2.186046511627907) internal successors, (94), 44 states have internal predecessors, (94), 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) [2021-11-25 18:01:38,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:01:38,910 INFO L93 Difference]: Finished difference Result 424 states and 467 transitions. [2021-11-25 18:01:38,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-25 18:01:38,910 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 2.186046511627907) internal successors, (94), 44 states have internal predecessors, (94), 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 34 [2021-11-25 18:01:38,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:01:38,912 INFO L225 Difference]: With dead ends: 424 [2021-11-25 18:01:38,912 INFO L226 Difference]: Without dead ends: 419 [2021-11-25 18:01:38,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2780 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=1852, Invalid=10804, Unknown=0, NotChecked=0, Total=12656 [2021-11-25 18:01:38,915 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 1179 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 1278 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1179 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 1622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 1278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:01:38,915 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1179 Valid, 292 Invalid, 1622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [344 Valid, 1278 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:01:38,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2021-11-25 18:01:38,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 342. [2021-11-25 18:01:38,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 338 states have (on average 1.1597633136094674) internal successors, (392), 341 states have internal predecessors, (392), 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) [2021-11-25 18:01:38,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 392 transitions. [2021-11-25 18:01:38,925 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 392 transitions. Word has length 34 [2021-11-25 18:01:38,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:01:38,926 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 392 transitions. [2021-11-25 18:01:38,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 2.186046511627907) internal successors, (94), 44 states have internal predecessors, (94), 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) [2021-11-25 18:01:38,926 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 392 transitions. [2021-11-25 18:01:38,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 18:01:38,927 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:01:38,927 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:01:38,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:39,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-25 18:01:39,141 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:01:39,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:01:39,142 INFO L85 PathProgramCache]: Analyzing trace with hash -101970809, now seen corresponding path program 1 times [2021-11-25 18:01:39,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:01:39,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936990904] [2021-11-25 18:01:39,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:39,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:01:39,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:39,378 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 9 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:01:39,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:01:39,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936990904] [2021-11-25 18:01:39,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936990904] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:01:39,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792965201] [2021-11-25 18:01:39,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:39,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:39,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:01:39,380 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:01:39,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 18:01:39,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:39,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-25 18:01:39,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:39,554 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 18:01:39,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 18:01:40,760 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 16 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:01:40,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:41,627 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:01:41,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1792965201] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:41,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1047345121] [2021-11-25 18:01:41,628 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 18:01:41,628 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:01:41,629 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:01:41,629 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:01:41,629 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:01:41,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:41,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:41,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:01:41,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:41,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:41,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:41,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:41,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 18:01:41,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:41,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:41,974 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:01:41,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:01:42,116 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:01:42,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 210 treesize of output 226 [2021-11-25 18:01:42,466 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:01:42,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:01:42,532 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:01:46,519 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13960#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~n#1|) (<= |ULTIMATE.start_cstrncat_~d~0#1.offset| (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|)) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (= (mod |ULTIMATE.start_cstrncat_~n#1| 4294967296) 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483645) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncat_~s~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrncat_~s~0#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|)) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (= (select |#valid| |ULTIMATE.start_cstrncat_~d~0#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (= (select |#valid| |ULTIMATE.start_cstrncat_~s~0#1.base|) 1) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrncat_~s~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrncat_~s~0#1.offset|)) (select (select |#memory_int| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrncat_~d~0#1.offset|))) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:01:46,520 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:01:46,520 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:01:46,520 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19, 19] total 51 [2021-11-25 18:01:46,520 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668351594] [2021-11-25 18:01:46,520 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:46,521 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-25 18:01:46,521 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:01:46,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-25 18:01:46,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=4085, Unknown=0, NotChecked=0, Total=4422 [2021-11-25 18:01:46,522 INFO L87 Difference]: Start difference. First operand 342 states and 392 transitions. Second operand has 52 states, 51 states have (on average 2.019607843137255) internal successors, (103), 52 states have internal predecessors, (103), 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) [2021-11-25 18:01:47,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:01:47,858 INFO L93 Difference]: Finished difference Result 496 states and 551 transitions. [2021-11-25 18:01:47,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 18:01:47,858 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 2.019607843137255) internal successors, (103), 52 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-25 18:01:47,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:01:47,860 INFO L225 Difference]: With dead ends: 496 [2021-11-25 18:01:47,860 INFO L226 Difference]: Without dead ends: 493 [2021-11-25 18:01:47,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 58 SyntacticMatches, 6 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2201 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=788, Invalid=7954, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 18:01:47,861 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 186 mSDsluCounter, 853 mSDsCounter, 0 mSdLazyCounter, 950 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 841 SdHoareTripleChecker+Invalid, 1766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 950 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 780 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:01:47,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 841 Invalid, 1766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 950 Invalid, 0 Unknown, 780 Unchecked, 0.4s Time] [2021-11-25 18:01:47,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2021-11-25 18:01:47,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 343. [2021-11-25 18:01:47,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 339 states have (on average 1.1563421828908556) internal successors, (392), 342 states have internal predecessors, (392), 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) [2021-11-25 18:01:47,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 392 transitions. [2021-11-25 18:01:47,870 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 392 transitions. Word has length 35 [2021-11-25 18:01:47,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:01:47,871 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 392 transitions. [2021-11-25 18:01:47,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 2.019607843137255) internal successors, (103), 52 states have internal predecessors, (103), 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) [2021-11-25 18:01:47,871 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 392 transitions. [2021-11-25 18:01:47,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 18:01:47,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:01:47,872 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:01:47,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:48,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-25 18:01:48,097 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:01:48,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:01:48,097 INFO L85 PathProgramCache]: Analyzing trace with hash -1371896404, now seen corresponding path program 11 times [2021-11-25 18:01:48,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:01:48,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365274998] [2021-11-25 18:01:48,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:48,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:01:48,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:48,421 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 25 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:01:48,422 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:01:48,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365274998] [2021-11-25 18:01:48,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365274998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:01:48,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828354782] [2021-11-25 18:01:48,422 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:01:48,422 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:48,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:01:48,423 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:01:48,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 18:01:48,617 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 18:01:48,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:01:48,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-25 18:01:48,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:48,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:48,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:01:48,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:01:49,133 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 36 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:01:49,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:49,831 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 49 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:01:49,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828354782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:49,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1111286605] [2021-11-25 18:01:49,833 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:01:49,833 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:01:49,833 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:01:49,834 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:01:49,834 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:01:49,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:49,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:49,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:01:49,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:49,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:49,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:01:50,005 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:01:50,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:01:50,310 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:01:52,678 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15145#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:01:52,678 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:01:52,678 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:01:52,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 55 [2021-11-25 18:01:52,678 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061641166] [2021-11-25 18:01:52,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:52,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-25 18:01:52,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:01:52,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-25 18:01:52,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=3811, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 18:01:52,680 INFO L87 Difference]: Start difference. First operand 343 states and 392 transitions. Second operand has 56 states, 55 states have (on average 1.9272727272727272) internal successors, (106), 56 states have internal predecessors, (106), 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) [2021-11-25 18:01:54,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:01:54,116 INFO L93 Difference]: Finished difference Result 675 states and 743 transitions. [2021-11-25 18:01:54,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 18:01:54,117 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.9272727272727272) internal successors, (106), 56 states have internal predecessors, (106), 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 36 [2021-11-25 18:01:54,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:01:54,120 INFO L225 Difference]: With dead ends: 675 [2021-11-25 18:01:54,120 INFO L226 Difference]: Without dead ends: 666 [2021-11-25 18:01:54,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1926 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1140, Invalid=5832, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 18:01:54,121 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 696 mSDsluCounter, 607 mSDsCounter, 0 mSdLazyCounter, 1611 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 696 SdHoareTripleChecker+Valid, 591 SdHoareTripleChecker+Invalid, 1752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 1611 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:01:54,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [696 Valid, 591 Invalid, 1752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 1611 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 18:01:54,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 666 states. [2021-11-25 18:01:54,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 666 to 366. [2021-11-25 18:01:54,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 362 states have (on average 1.1519337016574585) internal successors, (417), 365 states have internal predecessors, (417), 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) [2021-11-25 18:01:54,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 417 transitions. [2021-11-25 18:01:54,133 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 417 transitions. Word has length 36 [2021-11-25 18:01:54,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:01:54,133 INFO L470 AbstractCegarLoop]: Abstraction has 366 states and 417 transitions. [2021-11-25 18:01:54,134 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 1.9272727272727272) internal successors, (106), 56 states have internal predecessors, (106), 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) [2021-11-25 18:01:54,134 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 417 transitions. [2021-11-25 18:01:54,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 18:01:54,135 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:01:54,135 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:01:54,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:54,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-25 18:01:54,348 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:01:54,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:01:54,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1349829763, now seen corresponding path program 4 times [2021-11-25 18:01:54,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:01:54,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482221754] [2021-11-25 18:01:54,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:54,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:01:54,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:54,536 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:01:54,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:01:54,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482221754] [2021-11-25 18:01:54,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [482221754] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:01:54,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872206056] [2021-11-25 18:01:54,536 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:01:54,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:54,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:01:54,537 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:01:54,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 18:01:54,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:54,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-25 18:01:54,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:54,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:01:54,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 14 treesize of output 10 [2021-11-25 18:01:54,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 18:01:54,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 18:01:55,090 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-25 18:01:55,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2021-11-25 18:01:55,118 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 17 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:01:55,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:55,180 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1149 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_1149) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |c_ULTIMATE.start_cstrncat_~s~0#1.offset|) 0)) is different from false [2021-11-25 18:01:55,189 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1149 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_1149) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s~0#1.offset| 1)) 0)) is different from false [2021-11-25 18:01:55,207 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1149 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_1149) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s~0#1.offset| 2)) 0)) is different from false [2021-11-25 18:01:55,218 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1149 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~dst#1.base| v_ArrVal_1149) |c_ULTIMATE.start_cstrncat_~src#1.base|) (+ 2 |c_ULTIMATE.start_cstrncat_~src#1.offset|)) 0)) is different from false [2021-11-25 18:01:55,225 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:01:55,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 18:01:55,231 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:01:55,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 18:01:55,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 11 treesize of output 7 [2021-11-25 18:01:55,400 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 12 not checked. [2021-11-25 18:01:55,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872206056] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:55,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1781569526] [2021-11-25 18:01:55,402 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:01:55,402 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:01:55,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:01:55,402 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:01:55,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:01:55,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:55,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:01:55,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:01:55,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:55,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:55,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:55,615 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:01:55,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:01:55,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:55,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:01:55,800 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:01:55,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:01:55,920 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:01:55,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 210 treesize of output 226 [2021-11-25 18:01:56,523 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:56,525 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:56,527 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:01:56,590 INFO L354 Elim1Store]: treesize reduction 247, result has 19.0 percent of original size [2021-11-25 18:01:56,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 14 case distinctions, treesize of input 582 treesize of output 565 [2021-11-25 18:01:56,927 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:01:56,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:01:57,086 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:01:57,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:01:57,194 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:01,544 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16475#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (< (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.offset|) (<= 0 |#NULL.offset|) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))' at error location [2021-11-25 18:02:01,544 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:01,544 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:01,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15] total 33 [2021-11-25 18:02:01,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512960251] [2021-11-25 18:02:01,544 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:01,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 18:02:01,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:01,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 18:02:01,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1809, Unknown=4, NotChecked=356, Total=2352 [2021-11-25 18:02:01,545 INFO L87 Difference]: Start difference. First operand 366 states and 417 transitions. Second operand has 33 states, 33 states have (on average 2.3636363636363638) internal successors, (78), 33 states have internal predecessors, (78), 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) [2021-11-25 18:02:02,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:02,355 INFO L93 Difference]: Finished difference Result 461 states and 513 transitions. [2021-11-25 18:02:02,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 18:02:02,356 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.3636363636363638) internal successors, (78), 33 states have internal predecessors, (78), 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 36 [2021-11-25 18:02:02,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:02,358 INFO L225 Difference]: With dead ends: 461 [2021-11-25 18:02:02,358 INFO L226 Difference]: Without dead ends: 400 [2021-11-25 18:02:02,359 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 70 ConstructedPredicates, 4 IntricatePredicates, 3 DeprecatedPredicates, 1497 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=405, Invalid=4163, Unknown=4, NotChecked=540, Total=5112 [2021-11-25 18:02:02,359 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 111 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 334 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:02,360 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 237 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 272 Invalid, 0 Unknown, 334 Unchecked, 0.2s Time] [2021-11-25 18:02:02,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2021-11-25 18:02:02,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 394. [2021-11-25 18:02:02,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 394 states, 390 states have (on average 1.1487179487179486) internal successors, (448), 393 states have internal predecessors, (448), 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) [2021-11-25 18:02:02,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 448 transitions. [2021-11-25 18:02:02,368 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 448 transitions. Word has length 36 [2021-11-25 18:02:02,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:02,369 INFO L470 AbstractCegarLoop]: Abstraction has 394 states and 448 transitions. [2021-11-25 18:02:02,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.3636363636363638) internal successors, (78), 33 states have internal predecessors, (78), 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) [2021-11-25 18:02:02,369 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 448 transitions. [2021-11-25 18:02:02,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 18:02:02,370 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:02,370 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:02,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:02,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-11-25 18:02:02,597 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:02:02,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:02,598 INFO L85 PathProgramCache]: Analyzing trace with hash -856073332, now seen corresponding path program 2 times [2021-11-25 18:02:02,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:02,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177246962] [2021-11-25 18:02:02,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:02,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:02,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:02,765 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:02:02,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:02,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177246962] [2021-11-25 18:02:02,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177246962] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:02,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633247022] [2021-11-25 18:02:02,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:02:02,765 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:02,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:02,773 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:02,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 18:02:02,941 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:02:02,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:02,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-25 18:02:02,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:02,971 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 18:02:02,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 18:02:02,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:02:03,588 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:02:03,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:04,227 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:04,260 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:02:04,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633247022] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:04,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1877287343] [2021-11-25 18:02:04,262 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:02:04,262 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:04,262 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:04,262 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:04,263 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:04,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:04,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:04,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:02:04,359 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:04,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:04,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:04,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:04,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 18:02:04,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:04,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:04,714 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:02:04,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:02:04,926 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:02:04,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 356 treesize of output 372 [2021-11-25 18:02:05,544 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 32 iterations. Over-approximation may be very coarse. [2021-11-25 18:02:05,558 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 32 iterations. Over-approximation may be very coarse. [2021-11-25 18:02:05,661 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:05,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:05,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:05,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:05,832 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:02:05,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:02:06,049 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:06,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:06,214 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:06,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:06,357 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 31 iterations. Over-approximation may be very coarse. [2021-11-25 18:02:06,375 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:10,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17644#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post5#1.base|) 1) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrncat_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post5#1.base|) |ULTIMATE.start_cstrncat_#t~post5#1.offset|)) (<= (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:10,504 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:10,504 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:10,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 13] total 37 [2021-11-25 18:02:10,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624235183] [2021-11-25 18:02:10,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:10,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 18:02:10,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:10,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 18:02:10,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=2499, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 18:02:10,506 INFO L87 Difference]: Start difference. First operand 394 states and 448 transitions. Second operand has 38 states, 38 states have (on average 2.473684210526316) internal successors, (94), 37 states have internal predecessors, (94), 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) [2021-11-25 18:02:12,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:12,598 INFO L93 Difference]: Finished difference Result 469 states and 517 transitions. [2021-11-25 18:02:12,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 18:02:12,598 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.473684210526316) internal successors, (94), 37 states have internal predecessors, (94), 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 36 [2021-11-25 18:02:12,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:12,600 INFO L225 Difference]: With dead ends: 469 [2021-11-25 18:02:12,600 INFO L226 Difference]: Without dead ends: 445 [2021-11-25 18:02:12,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1843 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=987, Invalid=6323, Unknown=0, NotChecked=0, Total=7310 [2021-11-25 18:02:12,601 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 593 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 659 mSolverCounterSat, 287 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 593 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 287 IncrementalHoareTripleChecker+Valid, 659 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:12,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [593 Valid, 53 Invalid, 946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [287 Valid, 659 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:02:12,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2021-11-25 18:02:12,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 350. [2021-11-25 18:02:12,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 346 states have (on average 1.153179190751445) internal successors, (399), 349 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:12,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 399 transitions. [2021-11-25 18:02:12,610 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 399 transitions. Word has length 36 [2021-11-25 18:02:12,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:12,610 INFO L470 AbstractCegarLoop]: Abstraction has 350 states and 399 transitions. [2021-11-25 18:02:12,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.473684210526316) internal successors, (94), 37 states have internal predecessors, (94), 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) [2021-11-25 18:02:12,611 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 399 transitions. [2021-11-25 18:02:12,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 18:02:12,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:12,612 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:12,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-25 18:02:12,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:12,825 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:02:12,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:12,825 INFO L85 PathProgramCache]: Analyzing trace with hash 790339730, now seen corresponding path program 3 times [2021-11-25 18:02:12,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:12,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745250541] [2021-11-25 18:02:12,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:12,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:12,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:13,195 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 9 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:13,196 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:13,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745250541] [2021-11-25 18:02:13,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745250541] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:13,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599924563] [2021-11-25 18:02:13,196 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:02:13,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:13,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:13,197 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:13,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 18:02:13,436 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:02:13,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:13,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 18:02:13,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:13,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:13,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:02:13,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 18 treesize of output 16 [2021-11-25 18:02:13,891 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 16 proven. 32 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:02:13,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:14,432 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 25 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:02:14,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599924563] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:14,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1738926524] [2021-11-25 18:02:14,434 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:02:14,434 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:14,435 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:14,435 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:14,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:14,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:14,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:14,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:02:14,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:14,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:14,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:14,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:14,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 18:02:14,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:14,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:14,885 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:02:14,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:02:15,062 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:02:15,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 211 treesize of output 227 [2021-11-25 18:02:15,413 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:15,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:15,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:15,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:15,557 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:02:15,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:02:15,726 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:15,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:15,883 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:15,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:16,043 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:20,289 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18806#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post5#1.base|) 1) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrncat_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post5#1.base|) |ULTIMATE.start_cstrncat_#t~post5#1.offset|)) (<= (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:20,289 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:20,289 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:20,289 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 15] total 45 [2021-11-25 18:02:20,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71249745] [2021-11-25 18:02:20,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:20,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 18:02:20,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:20,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 18:02:20,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=3403, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 18:02:20,291 INFO L87 Difference]: Start difference. First operand 350 states and 399 transitions. Second operand has 46 states, 45 states have (on average 2.422222222222222) internal successors, (109), 46 states have internal predecessors, (109), 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) [2021-11-25 18:02:21,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:21,700 INFO L93 Difference]: Finished difference Result 567 states and 622 transitions. [2021-11-25 18:02:21,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 18:02:21,701 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.422222222222222) internal successors, (109), 46 states have internal predecessors, (109), 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 37 [2021-11-25 18:02:21,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:21,704 INFO L225 Difference]: With dead ends: 567 [2021-11-25 18:02:21,704 INFO L226 Difference]: Without dead ends: 546 [2021-11-25 18:02:21,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=1016, Invalid=6124, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 18:02:21,705 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 505 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 1047 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 505 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 1186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 1047 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:21,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [505 Valid, 292 Invalid, 1186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 1047 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:02:21,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2021-11-25 18:02:21,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 332. [2021-11-25 18:02:21,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 328 states have (on average 1.1585365853658536) internal successors, (380), 331 states have internal predecessors, (380), 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) [2021-11-25 18:02:21,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 380 transitions. [2021-11-25 18:02:21,715 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 380 transitions. Word has length 37 [2021-11-25 18:02:21,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:21,715 INFO L470 AbstractCegarLoop]: Abstraction has 332 states and 380 transitions. [2021-11-25 18:02:21,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.422222222222222) internal successors, (109), 46 states have internal predecessors, (109), 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) [2021-11-25 18:02:21,716 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 380 transitions. [2021-11-25 18:02:21,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 18:02:21,717 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:21,717 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:21,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:21,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-25 18:02:21,933 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:02:21,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:21,933 INFO L85 PathProgramCache]: Analyzing trace with hash 162516325, now seen corresponding path program 12 times [2021-11-25 18:02:21,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:21,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103932612] [2021-11-25 18:02:21,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:21,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:22,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:23,301 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 41 proven. 71 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:02:23,302 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:23,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103932612] [2021-11-25 18:02:23,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103932612] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:23,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611999554] [2021-11-25 18:02:23,302 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:02:23,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:23,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:23,304 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:23,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 18:02:23,472 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:02:23,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:23,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-25 18:02:23,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:23,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:02:23,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 18:02:23,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 18:02:25,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:25,551 INFO L354 Elim1Store]: treesize reduction 71, result has 36.0 percent of original size [2021-11-25 18:02:25,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 21 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 81 treesize of output 70 [2021-11-25 18:02:25,573 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 21 proven. 91 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:02:25,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:26,018 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1298 (Array Int Int))) (let ((.cse0 (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1298) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 6)) 0) (= (select .cse0 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 4)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 5)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0)))) is different from false [2021-11-25 18:02:26,033 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:26,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 181 treesize of output 97 [2021-11-25 18:02:26,041 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,042 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,042 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,042 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,043 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,043 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,043 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,044 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,044 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,045 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,045 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,045 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,046 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,046 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,046 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,047 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,047 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,047 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,048 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,048 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,048 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,074 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:26,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 21 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 186 treesize of output 246 [2021-11-25 18:02:26,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,085 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,085 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,086 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,086 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,086 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,087 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,087 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,087 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,088 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,088 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,088 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,089 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,089 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,089 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,090 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,090 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,090 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,091 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,091 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:26,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 50 [2021-11-25 18:02:27,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:02:27,346 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 63 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:02:27,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611999554] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:27,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [609787359] [2021-11-25 18:02:27,348 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:02:27,348 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:27,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:27,349 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:27,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:27,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:27,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:27,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:02:27,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:27,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:27,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:02:27,539 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:02:27,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:02:27,835 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:30,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20057#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:02:30,672 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:30,673 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:30,673 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 66 [2021-11-25 18:02:30,673 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443540326] [2021-11-25 18:02:30,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:30,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-25 18:02:30,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:30,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-25 18:02:30,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=5283, Unknown=1, NotChecked=148, Total=5852 [2021-11-25 18:02:30,674 INFO L87 Difference]: Start difference. First operand 332 states and 380 transitions. Second operand has 67 states, 67 states have (on average 1.4179104477611941) internal successors, (95), 66 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:33,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:33,142 INFO L93 Difference]: Finished difference Result 416 states and 474 transitions. [2021-11-25 18:02:33,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 18:02:33,143 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.4179104477611941) internal successors, (95), 66 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-25 18:02:33,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:33,145 INFO L225 Difference]: With dead ends: 416 [2021-11-25 18:02:33,145 INFO L226 Difference]: Without dead ends: 382 [2021-11-25 18:02:33,146 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2735 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=765, Invalid=8744, Unknown=1, NotChecked=192, Total=9702 [2021-11-25 18:02:33,146 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 146 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 992 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 362 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:33,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 163 Invalid, 992 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 600 Invalid, 0 Unknown, 362 Unchecked, 0.4s Time] [2021-11-25 18:02:33,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2021-11-25 18:02:33,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 351. [2021-11-25 18:02:33,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 351 states, 347 states have (on average 1.1613832853025936) internal successors, (403), 350 states have internal predecessors, (403), 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) [2021-11-25 18:02:33,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 403 transitions. [2021-11-25 18:02:33,154 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 403 transitions. Word has length 38 [2021-11-25 18:02:33,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:33,155 INFO L470 AbstractCegarLoop]: Abstraction has 351 states and 403 transitions. [2021-11-25 18:02:33,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.4179104477611941) internal successors, (95), 66 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:33,155 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 403 transitions. [2021-11-25 18:02:33,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 18:02:33,156 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:33,156 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:33,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:33,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:33,373 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:02:33,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:33,373 INFO L85 PathProgramCache]: Analyzing trace with hash 565573687, now seen corresponding path program 3 times [2021-11-25 18:02:33,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:33,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062620] [2021-11-25 18:02:33,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:33,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:33,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:34,040 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 12 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:34,040 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:34,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062620] [2021-11-25 18:02:34,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062620] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:34,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963764846] [2021-11-25 18:02:34,040 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:02:34,041 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:34,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:34,053 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:34,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 18:02:34,301 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:02:34,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:34,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 18:02:34,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:34,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 18 treesize of output 16 [2021-11-25 18:02:34,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 18:02:34,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 18:02:35,044 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:35,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2021-11-25 18:02:35,195 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 2 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:35,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:35,557 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:35,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2021-11-25 18:02:35,563 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:35,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 40 [2021-11-25 18:02:35,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 11 treesize of output 7 [2021-11-25 18:02:36,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 18 treesize of output 16 [2021-11-25 18:02:36,181 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:36,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963764846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:36,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [473359978] [2021-11-25 18:02:36,182 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 18:02:36,182 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:36,182 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:36,182 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:36,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:36,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:36,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:36,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:02:36,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:36,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:36,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:36,381 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:02:36,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:02:36,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:36,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:36,560 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:02:36,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:02:36,733 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:02:36,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 356 treesize of output 372 [2021-11-25 18:02:37,334 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 32 iterations. Over-approximation may be very coarse. [2021-11-25 18:02:37,353 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 32 iterations. Over-approximation may be very coarse. [2021-11-25 18:02:37,472 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:37,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:37,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:37,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:37,633 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:02:37,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:02:37,820 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:37,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:37,966 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:37,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:38,127 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 31 iterations. Over-approximation may be very coarse. [2021-11-25 18:02:38,154 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:42,929 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21155#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= |ULTIMATE.start_cstrncat_~d~0#1.offset| (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|)) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (= (mod |ULTIMATE.start_cstrncat_~n#1| 4294967296) 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483645) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrncat_~d~0#1.offset|)) 0)) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (= (select |#valid| |ULTIMATE.start_cstrncat_~d~0#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:42,929 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:42,929 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:42,929 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 20] total 53 [2021-11-25 18:02:42,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920622688] [2021-11-25 18:02:42,930 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:42,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-25 18:02:42,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:42,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-25 18:02:42,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=432, Invalid=4398, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 18:02:42,931 INFO L87 Difference]: Start difference. First operand 351 states and 403 transitions. Second operand has 54 states, 54 states have (on average 1.962962962962963) internal successors, (106), 53 states have internal predecessors, (106), 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) [2021-11-25 18:02:43,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:43,414 INFO L93 Difference]: Finished difference Result 362 states and 413 transitions. [2021-11-25 18:02:43,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 18:02:43,415 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.962962962962963) internal successors, (106), 53 states have internal predecessors, (106), 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 38 [2021-11-25 18:02:43,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:43,416 INFO L225 Difference]: With dead ends: 362 [2021-11-25 18:02:43,416 INFO L226 Difference]: Without dead ends: 355 [2021-11-25 18:02:43,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2197 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=567, Invalid=5285, Unknown=0, NotChecked=0, Total=5852 [2021-11-25 18:02:43,417 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 79 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:43,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 292 Invalid, 538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 452 Invalid, 0 Unknown, 56 Unchecked, 0.2s Time] [2021-11-25 18:02:43,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2021-11-25 18:02:43,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 351. [2021-11-25 18:02:43,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 351 states, 347 states have (on average 1.15850144092219) internal successors, (402), 350 states have internal predecessors, (402), 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) [2021-11-25 18:02:43,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 402 transitions. [2021-11-25 18:02:43,424 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 402 transitions. Word has length 38 [2021-11-25 18:02:43,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:43,425 INFO L470 AbstractCegarLoop]: Abstraction has 351 states and 402 transitions. [2021-11-25 18:02:43,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.962962962962963) internal successors, (106), 53 states have internal predecessors, (106), 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) [2021-11-25 18:02:43,425 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 402 transitions. [2021-11-25 18:02:43,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 18:02:43,426 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:43,426 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:43,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:43,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:43,645 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:02:43,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:43,645 INFO L85 PathProgramCache]: Analyzing trace with hash 987706210, now seen corresponding path program 13 times [2021-11-25 18:02:43,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:43,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099976733] [2021-11-25 18:02:43,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:43,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:43,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:43,995 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 36 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:43,995 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:43,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099976733] [2021-11-25 18:02:43,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099976733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:43,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171486548] [2021-11-25 18:02:43,995 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:02:43,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:43,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:44,001 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:44,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 18:02:44,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:44,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 18:02:44,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:44,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:44,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:02:44,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:02:44,766 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 49 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:44,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:45,555 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 64 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:45,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171486548] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:45,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [89278082] [2021-11-25 18:02:45,556 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:02:45,556 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:45,556 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:45,557 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:45,557 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:45,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:45,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:45,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:02:45,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:45,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:45,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:02:45,711 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:02:45,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:02:46,012 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:48,522 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22192#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:02:48,522 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:48,522 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:48,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 59 [2021-11-25 18:02:48,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228057919] [2021-11-25 18:02:48,523 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:48,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-25 18:02:48,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:48,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-25 18:02:48,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=4371, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 18:02:48,524 INFO L87 Difference]: Start difference. First operand 351 states and 402 transitions. Second operand has 60 states, 59 states have (on average 2.0) internal successors, (118), 60 states have internal predecessors, (118), 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) [2021-11-25 18:02:50,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:50,438 INFO L93 Difference]: Finished difference Result 764 states and 840 transitions. [2021-11-25 18:02:50,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 18:02:50,439 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 2.0) internal successors, (118), 60 states have internal predecessors, (118), 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 40 [2021-11-25 18:02:50,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:50,442 INFO L225 Difference]: With dead ends: 764 [2021-11-25 18:02:50,442 INFO L226 Difference]: Without dead ends: 755 [2021-11-25 18:02:50,443 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2046 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1429, Invalid=7691, Unknown=0, NotChecked=0, Total=9120 [2021-11-25 18:02:50,443 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 887 mSDsluCounter, 732 mSDsCounter, 0 mSdLazyCounter, 1989 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 887 SdHoareTripleChecker+Valid, 712 SdHoareTripleChecker+Invalid, 2172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 1989 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:50,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [887 Valid, 712 Invalid, 2172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 1989 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:02:50,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-11-25 18:02:50,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 374. [2021-11-25 18:02:50,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 370 states have (on average 1.154054054054054) internal successors, (427), 373 states have internal predecessors, (427), 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) [2021-11-25 18:02:50,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 427 transitions. [2021-11-25 18:02:50,454 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 427 transitions. Word has length 40 [2021-11-25 18:02:50,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:50,454 INFO L470 AbstractCegarLoop]: Abstraction has 374 states and 427 transitions. [2021-11-25 18:02:50,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 2.0) internal successors, (118), 60 states have internal predecessors, (118), 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) [2021-11-25 18:02:50,454 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 427 transitions. [2021-11-25 18:02:50,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 18:02:50,455 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:50,456 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:50,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:50,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-25 18:02:50,681 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:02:50,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:50,681 INFO L85 PathProgramCache]: Analyzing trace with hash 1651924211, now seen corresponding path program 5 times [2021-11-25 18:02:50,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:50,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485749733] [2021-11-25 18:02:50,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:50,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:50,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:50,894 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 1 proven. 29 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:02:50,895 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:50,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485749733] [2021-11-25 18:02:50,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485749733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:50,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349016356] [2021-11-25 18:02:50,895 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:02:50,895 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:50,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:50,896 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:50,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 18:02:51,083 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:02:51,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:51,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-25 18:02:51,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:51,101 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 18:02:51,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 18:02:51,435 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:02:51,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:51,873 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 9 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:02:51,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1349016356] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:51,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1268216044] [2021-11-25 18:02:51,874 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:02:51,874 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:51,874 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:51,874 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:51,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:51,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:51,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:51,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:02:51,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:52,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:52,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:52,114 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:02:52,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:02:52,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:52,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:02:52,286 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:02:52,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:02:52,424 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:02:52,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 210 treesize of output 226 [2021-11-25 18:02:52,872 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:52,874 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:52,876 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:52,939 INFO L354 Elim1Store]: treesize reduction 247, result has 19.0 percent of original size [2021-11-25 18:02:52,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 14 case distinctions, treesize of input 417 treesize of output 414 [2021-11-25 18:02:53,301 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:53,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:53,466 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:02:53,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:02:53,576 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:58,041 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23664#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (< (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:58,042 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:58,042 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:58,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 37 [2021-11-25 18:02:58,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053578167] [2021-11-25 18:02:58,042 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:58,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 18:02:58,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:58,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 18:02:58,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=2584, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 18:02:58,043 INFO L87 Difference]: Start difference. First operand 374 states and 427 transitions. Second operand has 38 states, 37 states have (on average 2.7027027027027026) internal successors, (100), 38 states have internal predecessors, (100), 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) [2021-11-25 18:02:58,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:58,801 INFO L93 Difference]: Finished difference Result 633 states and 703 transitions. [2021-11-25 18:02:58,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 18:02:58,802 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 2.7027027027027026) internal successors, (100), 38 states have internal predecessors, (100), 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 40 [2021-11-25 18:02:58,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:58,804 INFO L225 Difference]: With dead ends: 633 [2021-11-25 18:02:58,804 INFO L226 Difference]: Without dead ends: 633 [2021-11-25 18:02:58,805 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1285 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=640, Invalid=4052, Unknown=0, NotChecked=0, Total=4692 [2021-11-25 18:02:58,805 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 419 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 504 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 419 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:58,805 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [419 Valid, 150 Invalid, 545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 504 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:02:58,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2021-11-25 18:02:58,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 476. [2021-11-25 18:02:58,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 472 states have (on average 1.1588983050847457) internal successors, (547), 475 states have internal predecessors, (547), 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) [2021-11-25 18:02:58,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 547 transitions. [2021-11-25 18:02:58,816 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 547 transitions. Word has length 40 [2021-11-25 18:02:58,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:58,816 INFO L470 AbstractCegarLoop]: Abstraction has 476 states and 547 transitions. [2021-11-25 18:02:58,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 2.7027027027027026) internal successors, (100), 38 states have internal predecessors, (100), 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) [2021-11-25 18:02:58,816 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 547 transitions. [2021-11-25 18:02:58,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 18:02:58,818 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:58,818 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:58,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:59,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-25 18:02:59,041 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:02:59,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:59,041 INFO L85 PathProgramCache]: Analyzing trace with hash 261409081, now seen corresponding path program 1 times [2021-11-25 18:02:59,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:59,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815773299] [2021-11-25 18:02:59,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:59,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:59,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:59,352 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 19 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:02:59,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:59,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815773299] [2021-11-25 18:02:59,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815773299] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:59,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371593386] [2021-11-25 18:02:59,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:59,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:59,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:59,354 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:59,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-25 18:02:59,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:59,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-25 18:02:59,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:59,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:02:59,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 14 treesize of output 10 [2021-11-25 18:02:59,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 18:02:59,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 18:02:59,902 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-25 18:02:59,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2021-11-25 18:02:59,925 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 8 proven. 17 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:02:59,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:59,976 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1525 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_1525) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |c_ULTIMATE.start_cstrncat_~s~0#1.offset|) 0)) is different from false [2021-11-25 18:02:59,982 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1525 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_1525) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s~0#1.offset| 1)) 0)) is different from false [2021-11-25 18:02:59,996 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1525 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_1525) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s~0#1.offset| 2)) 0)) is different from false [2021-11-25 18:03:00,010 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1525 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~dst#1.base| v_ArrVal_1525) |c_ULTIMATE.start_cstrncat_~src#1.base|) (+ 2 |c_ULTIMATE.start_cstrncat_~src#1.offset|)) 0)) is different from false [2021-11-25 18:03:00,015 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:03:00,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 18:03:00,020 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:03:00,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 18:03:00,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 11 treesize of output 7 [2021-11-25 18:03:00,157 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 18 trivial. 12 not checked. [2021-11-25 18:03:00,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371593386] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:03:00,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1727840519] [2021-11-25 18:03:00,159 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:03:00,159 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:03:00,159 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:03:00,159 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:03:00,159 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:03:00,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:00,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:00,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:03:00,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:03:00,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:03:00,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:03:00,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:00,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 18:03:00,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:03:00,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:03:00,498 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:03:00,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:03:00,686 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:03:00,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 356 treesize of output 372 [2021-11-25 18:03:01,453 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 32 iterations. Over-approximation may be very coarse. [2021-11-25 18:03:01,463 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 32 iterations. Over-approximation may be very coarse. [2021-11-25 18:03:01,544 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:03:01,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:03:01,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:01,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:01,685 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:03:01,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:03:01,839 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:03:01,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:03:02,002 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:03:02,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:03:02,115 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 31 iterations. Over-approximation may be very coarse. [2021-11-25 18:03:02,127 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:03:06,156 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25089#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (< (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:03:06,156 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:03:06,157 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:03:06,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 36 [2021-11-25 18:03:06,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353385462] [2021-11-25 18:03:06,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:03:06,157 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 18:03:06,157 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:03:06,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 18:03:06,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1997, Unknown=4, NotChecked=372, Total=2550 [2021-11-25 18:03:06,158 INFO L87 Difference]: Start difference. First operand 476 states and 547 transitions. Second operand has 36 states, 36 states have (on average 2.4444444444444446) internal successors, (88), 36 states have internal predecessors, (88), 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) [2021-11-25 18:03:07,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:03:07,547 INFO L93 Difference]: Finished difference Result 608 states and 661 transitions. [2021-11-25 18:03:07,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-25 18:03:07,547 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.4444444444444446) internal successors, (88), 36 states have internal predecessors, (88), 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 40 [2021-11-25 18:03:07,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:03:07,549 INFO L225 Difference]: With dead ends: 608 [2021-11-25 18:03:07,549 INFO L226 Difference]: Without dead ends: 434 [2021-11-25 18:03:07,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 81 SyntacticMatches, 6 SemanticMatches, 81 ConstructedPredicates, 4 IntricatePredicates, 3 DeprecatedPredicates, 2139 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=494, Invalid=5680, Unknown=4, NotChecked=628, Total=6806 [2021-11-25 18:03:07,550 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 135 mSDsluCounter, 508 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 1061 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 611 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:03:07,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 512 Invalid, 1061 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 414 Invalid, 0 Unknown, 611 Unchecked, 0.2s Time] [2021-11-25 18:03:07,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-25 18:03:07,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 404. [2021-11-25 18:03:07,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 400 states have (on average 1.1375) internal successors, (455), 403 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) [2021-11-25 18:03:07,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 455 transitions. [2021-11-25 18:03:07,558 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 455 transitions. Word has length 40 [2021-11-25 18:03:07,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:03:07,558 INFO L470 AbstractCegarLoop]: Abstraction has 404 states and 455 transitions. [2021-11-25 18:03:07,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.4444444444444446) internal successors, (88), 36 states have internal predecessors, (88), 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) [2021-11-25 18:03:07,558 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 455 transitions. [2021-11-25 18:03:07,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 18:03:07,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:03:07,559 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:03:07,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-25 18:03:07,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:03:07,773 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:03:07,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:03:07,774 INFO L85 PathProgramCache]: Analyzing trace with hash -2103909, now seen corresponding path program 14 times [2021-11-25 18:03:07,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:03:07,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [540691281] [2021-11-25 18:03:07,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:03:07,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:03:07,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:03:09,408 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 54 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:03:09,408 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:03:09,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [540691281] [2021-11-25 18:03:09,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [540691281] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:03:09,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707548433] [2021-11-25 18:03:09,408 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:03:09,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:03:09,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:03:09,409 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:03:09,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-25 18:03:09,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-25 18:03:09,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:03:09,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-25 18:03:09,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:03:09,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:03:10,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 18:03:10,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 18:03:45,652 INFO L354 Elim1Store]: treesize reduction 403, result has 10.2 percent of original size [2021-11-25 18:03:45,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 91 treesize of output 80 [2021-11-25 18:03:45,686 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 31 proven. 71 refuted. 42 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:03:45,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:03:46,347 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:03:46,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 207 treesize of output 109 [2021-11-25 18:03:46,465 INFO L354 Elim1Store]: treesize reduction 368, result has 18.0 percent of original size [2021-11-25 18:03:46,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 211 treesize of output 235 [2021-11-25 18:03:46,482 INFO L354 Elim1Store]: treesize reduction 322, result has 0.3 percent of original size [2021-11-25 18:03:46,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 87 treesize of output 57 [2021-11-25 18:03:48,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:03:48,944 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 80 proven. 64 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:03:48,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707548433] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:03:48,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1494170567] [2021-11-25 18:03:48,946 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:03:48,946 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:03:48,946 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:03:48,946 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:03:48,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:03:48,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:48,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:48,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:03:49,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:03:49,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:03:49,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:03:49,122 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:03:49,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:03:49,439 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:03:52,617 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26507#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:03:52,617 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:03:52,617 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:03:52,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 76 [2021-11-25 18:03:52,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761608195] [2021-11-25 18:03:52,618 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:03:52,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-25 18:03:52,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:03:52,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-25 18:03:52,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=6883, Unknown=58, NotChecked=0, Total=7482 [2021-11-25 18:03:52,619 INFO L87 Difference]: Start difference. First operand 404 states and 455 transitions. Second operand has 77 states, 77 states have (on average 1.3636363636363635) internal successors, (105), 76 states have internal predecessors, (105), 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) [2021-11-25 18:04:54,289 WARN L227 SmtUtils]: Spent 6.02s on a formula simplification. DAG size of input: 78 DAG size of output: 73 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:05:05,372 WARN L227 SmtUtils]: Spent 10.15s on a formula simplification. DAG size of input: 86 DAG size of output: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:05:13,756 WARN L227 SmtUtils]: Spent 7.51s on a formula simplification. DAG size of input: 83 DAG size of output: 78 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:05:21,062 WARN L227 SmtUtils]: Spent 7.22s on a formula simplification. DAG size of input: 87 DAG size of output: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:05:21,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:05:21,087 INFO L93 Difference]: Finished difference Result 612 states and 685 transitions. [2021-11-25 18:05:21,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-25 18:05:21,087 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.3636363636363635) internal successors, (105), 76 states have internal predecessors, (105), 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 42 [2021-11-25 18:05:21,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:05:21,089 INFO L225 Difference]: With dead ends: 612 [2021-11-25 18:05:21,090 INFO L226 Difference]: Without dead ends: 574 [2021-11-25 18:05:21,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 5506 ImplicationChecksByTransitivity, 128.1s TimeCoverageRelationStatistics Valid=1722, Invalid=16807, Unknown=103, NotChecked=0, Total=18632 [2021-11-25 18:05:21,091 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 600 mSDsluCounter, 604 mSDsCounter, 0 mSdLazyCounter, 1525 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 600 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 1953 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 1525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 259 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:05:21,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [600 Valid, 555 Invalid, 1953 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 1525 Invalid, 0 Unknown, 259 Unchecked, 0.9s Time] [2021-11-25 18:05:21,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2021-11-25 18:05:21,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 423. [2021-11-25 18:05:21,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 419 states have (on average 1.1408114558472553) internal successors, (478), 422 states have internal predecessors, (478), 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) [2021-11-25 18:05:21,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 478 transitions. [2021-11-25 18:05:21,099 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 478 transitions. Word has length 42 [2021-11-25 18:05:21,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:05:21,099 INFO L470 AbstractCegarLoop]: Abstraction has 423 states and 478 transitions. [2021-11-25 18:05:21,099 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 1.3636363636363635) internal successors, (105), 76 states have internal predecessors, (105), 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) [2021-11-25 18:05:21,100 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 478 transitions. [2021-11-25 18:05:21,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 18:05:21,101 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:05:21,101 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:05:21,135 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-25 18:05:21,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-25 18:05:21,317 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:05:21,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:05:21,318 INFO L85 PathProgramCache]: Analyzing trace with hash -2031544723, now seen corresponding path program 4 times [2021-11-25 18:05:21,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:05:21,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154642212] [2021-11-25 18:05:21,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:05:21,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:05:21,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:05:22,405 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:05:22,405 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:05:22,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154642212] [2021-11-25 18:05:22,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154642212] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:05:22,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289327360] [2021-11-25 18:05:22,406 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:05:22,406 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:05:22,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:05:22,407 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:05:22,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 18:05:22,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:05:22,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-25 18:05:22,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:05:22,614 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 18:05:22,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 18:05:23,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:05:23,213 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 18:05:23,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 26 [2021-11-25 18:05:23,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 11 treesize of output 3 [2021-11-25 18:05:24,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:24,855 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:05:24,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 45 [2021-11-25 18:05:25,391 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 18:05:25,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 27 [2021-11-25 18:05:25,497 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 2 proven. 51 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:05:25,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:05:26,596 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:05:26,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 39 [2021-11-25 18:05:26,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:05:26,607 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:05:26,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 65 treesize of output 75 [2021-11-25 18:05:26,613 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:05:26,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 15 [2021-11-25 18:05:28,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 98 treesize of output 94 [2021-11-25 18:05:28,440 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 14 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:05:28,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289327360] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:05:28,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [722056386] [2021-11-25 18:05:28,442 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 18:05:28,442 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:05:28,442 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:05:28,442 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:05:28,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:05:28,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:28,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:28,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:05:28,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:28,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:28,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:28,708 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:05:28,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:05:28,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:28,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:28,897 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:05:28,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:05:29,047 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:05:29,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 211 treesize of output 227 [2021-11-25 18:05:29,636 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:05:29,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:05:29,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:29,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:29,808 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:05:29,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:05:30,037 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:05:30,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:05:30,199 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:05:30,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:05:30,380 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:05:36,138 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27971#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= |ULTIMATE.start_cstrncat_~d~0#1.offset| (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|)) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (= (mod |ULTIMATE.start_cstrncat_~n#1| 4294967296) 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483645) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_cstrncat_#t~post5#1.base_162| Int) (|v_ULTIMATE.start_cstrncat_#t~post5#1.offset_161| Int)) (and (= (select |#valid| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_162|) 1) (<= (+ |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_161| 1) (select |#length| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_162|)) (= (select (select |#memory_int| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrncat_~d~0#1.offset|)) (select (select |#memory_int| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_162|) |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_161|)) (<= 0 |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_161|) (not (= 0 (select (select |#memory_int| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_162|) |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_161|))) (<= 0 |v_ULTIMATE.start_cstrncat_#t~post5#1.base_162|))) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (= (select |#valid| |ULTIMATE.start_cstrncat_~d~0#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:05:36,139 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:05:36,139 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:05:36,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 72 [2021-11-25 18:05:36,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188982337] [2021-11-25 18:05:36,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:05:36,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-25 18:05:36,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:05:36,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-25 18:05:36,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=7230, Unknown=1, NotChecked=0, Total=7656 [2021-11-25 18:05:36,141 INFO L87 Difference]: Start difference. First operand 423 states and 478 transitions. Second operand has 72 states, 72 states have (on average 1.7361111111111112) internal successors, (125), 72 states have internal predecessors, (125), 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) [2021-11-25 18:05:39,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:05:39,897 INFO L93 Difference]: Finished difference Result 470 states and 526 transitions. [2021-11-25 18:05:39,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-25 18:05:39,897 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.7361111111111112) internal successors, (125), 72 states have internal predecessors, (125), 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 42 [2021-11-25 18:05:39,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:05:39,899 INFO L225 Difference]: With dead ends: 470 [2021-11-25 18:05:39,899 INFO L226 Difference]: Without dead ends: 470 [2021-11-25 18:05:39,900 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3450 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=893, Invalid=13626, Unknown=1, NotChecked=0, Total=14520 [2021-11-25 18:05:39,900 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 110 mSDsluCounter, 464 mSDsCounter, 0 mSdLazyCounter, 927 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 1368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 927 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 394 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:05:39,900 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 432 Invalid, 1368 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 927 Invalid, 0 Unknown, 394 Unchecked, 0.6s Time] [2021-11-25 18:05:39,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2021-11-25 18:05:39,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 462. [2021-11-25 18:05:39,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 458 states have (on average 1.1331877729257642) internal successors, (519), 461 states have internal predecessors, (519), 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) [2021-11-25 18:05:39,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 519 transitions. [2021-11-25 18:05:39,908 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 519 transitions. Word has length 42 [2021-11-25 18:05:39,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:05:39,908 INFO L470 AbstractCegarLoop]: Abstraction has 462 states and 519 transitions. [2021-11-25 18:05:39,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.7361111111111112) internal successors, (125), 72 states have internal predecessors, (125), 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) [2021-11-25 18:05:39,908 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 519 transitions. [2021-11-25 18:05:39,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 18:05:39,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:05:39,910 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:05:39,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-25 18:05:40,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-25 18:05:40,117 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:05:40,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:05:40,118 INFO L85 PathProgramCache]: Analyzing trace with hash -1631451880, now seen corresponding path program 15 times [2021-11-25 18:05:40,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:05:40,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807131027] [2021-11-25 18:05:40,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:05:40,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:05:40,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:05:40,558 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 49 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:05:40,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:05:40,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807131027] [2021-11-25 18:05:40,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [807131027] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:05:40,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031378277] [2021-11-25 18:05:40,558 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:05:40,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:05:40,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:05:40,559 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:05:40,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-25 18:05:40,806 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:05:40,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:05:40,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-25 18:05:40,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:05:40,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:40,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:05:40,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:05:41,556 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 64 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:05:41,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:05:42,485 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 81 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:05:42,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031378277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:05:42,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [536001466] [2021-11-25 18:05:42,486 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:05:42,487 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:05:42,487 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:05:42,487 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:05:42,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:05:42,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:42,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:42,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:05:42,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:42,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:42,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:05:42,665 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:05:42,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:05:42,970 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:05:45,739 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29319#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:05:45,739 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:05:45,740 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:05:45,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 66 [2021-11-25 18:05:45,740 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208714830] [2021-11-25 18:05:45,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:05:45,740 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-25 18:05:45,740 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:05:45,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-25 18:05:45,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=5255, Unknown=0, NotChecked=0, Total=5852 [2021-11-25 18:05:45,741 INFO L87 Difference]: Start difference. First operand 462 states and 519 transitions. Second operand has 67 states, 66 states have (on average 1.9696969696969697) internal successors, (130), 67 states have internal predecessors, (130), 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) [2021-11-25 18:05:47,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:05:47,372 INFO L93 Difference]: Finished difference Result 1134 states and 1234 transitions. [2021-11-25 18:05:47,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 18:05:47,372 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.9696969696969697) internal successors, (130), 67 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-25 18:05:47,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:05:47,376 INFO L225 Difference]: With dead ends: 1134 [2021-11-25 18:05:47,376 INFO L226 Difference]: Without dead ends: 1120 [2021-11-25 18:05:47,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2695 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1439, Invalid=7873, Unknown=0, NotChecked=0, Total=9312 [2021-11-25 18:05:47,377 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 738 mSDsluCounter, 913 mSDsCounter, 0 mSdLazyCounter, 2325 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 738 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 2486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 2325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:05:47,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [738 Valid, 895 Invalid, 2486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 2325 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 18:05:47,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1120 states. [2021-11-25 18:05:47,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1120 to 492. [2021-11-25 18:05:47,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 492 states, 488 states have (on average 1.1290983606557377) internal successors, (551), 491 states have internal predecessors, (551), 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) [2021-11-25 18:05:47,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 551 transitions. [2021-11-25 18:05:47,390 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 551 transitions. Word has length 44 [2021-11-25 18:05:47,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:05:47,390 INFO L470 AbstractCegarLoop]: Abstraction has 492 states and 551 transitions. [2021-11-25 18:05:47,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 1.9696969696969697) internal successors, (130), 67 states have internal predecessors, (130), 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) [2021-11-25 18:05:47,391 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 551 transitions. [2021-11-25 18:05:47,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 18:05:47,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:05:47,392 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:05:47,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-25 18:05:47,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:05:47,613 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:05:47,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:05:47,614 INFO L85 PathProgramCache]: Analyzing trace with hash 1895680248, now seen corresponding path program 4 times [2021-11-25 18:05:47,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:05:47,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263929281] [2021-11-25 18:05:47,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:05:47,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:05:47,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:05:48,452 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 3 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:05:48,452 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:05:48,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263929281] [2021-11-25 18:05:48,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263929281] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:05:48,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903856406] [2021-11-25 18:05:48,452 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:05:48,452 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:05:48,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:05:48,453 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:05:48,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-25 18:05:48,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:05:48,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-25 18:05:48,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:05:48,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:05:49,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 18:05:49,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 18:05:50,304 INFO L354 Elim1Store]: treesize reduction 24, result has 41.5 percent of original size [2021-11-25 18:05:50,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 27 [2021-11-25 18:05:50,473 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 46 refuted. 1 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 18:05:50,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:05:51,035 WARN L838 $PredicateComparison]: unable to prove that (or (= (mod (+ 4294967295 |c_ULTIMATE.start_main_~n~0#1|) 4294967296) 0) (forall ((v_ArrVal_1754 (Array Int Int))) (let ((.cse0 (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1754) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2)) 0))))) is different from false [2021-11-25 18:05:51,045 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:05:51,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 39 [2021-11-25 18:05:51,062 INFO L354 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2021-11-25 18:05:51,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 65 treesize of output 63 [2021-11-25 18:05:51,068 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-25 18:05:51,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 15 [2021-11-25 18:05:52,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:05:52,115 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 22 proven. 35 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 18:05:52,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903856406] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:05:52,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2104275759] [2021-11-25 18:05:52,117 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:05:52,117 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:05:52,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:05:52,117 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:05:52,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:05:52,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:52,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:52,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:05:52,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:52,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:52,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:52,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:52,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 18:05:52,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:52,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:05:52,460 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:05:52,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:05:52,616 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:05:52,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 210 treesize of output 226 [2021-11-25 18:05:53,063 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:05:53,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:05:53,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:53,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:53,248 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:05:53,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:05:53,452 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:05:53,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:05:53,596 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:05:53,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:05:53,718 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:05:58,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31317#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post5#1.base|) 1) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrncat_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post5#1.base|) |ULTIMATE.start_cstrncat_#t~post5#1.offset|)) (<= (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:05:58,840 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:05:58,840 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:05:58,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 21] total 64 [2021-11-25 18:05:58,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645239155] [2021-11-25 18:05:58,840 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:05:58,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-25 18:05:58,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:05:58,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-25 18:05:58,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=5650, Unknown=3, NotChecked=152, Total=6162 [2021-11-25 18:05:58,842 INFO L87 Difference]: Start difference. First operand 492 states and 551 transitions. Second operand has 64 states, 64 states have (on average 1.90625) internal successors, (122), 64 states have internal predecessors, (122), 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) [2021-11-25 18:06:02,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:06:02,174 INFO L93 Difference]: Finished difference Result 483 states and 539 transitions. [2021-11-25 18:06:02,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 18:06:02,174 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.90625) internal successors, (122), 64 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-25 18:06:02,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:06:02,177 INFO L225 Difference]: With dead ends: 483 [2021-11-25 18:06:02,177 INFO L226 Difference]: Without dead ends: 458 [2021-11-25 18:06:02,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2190 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=645, Invalid=9455, Unknown=4, NotChecked=198, Total=10302 [2021-11-25 18:06:02,178 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 81 mSDsluCounter, 450 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 1053 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 872 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:06:02,178 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 425 Invalid, 1053 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 872 Invalid, 0 Unknown, 147 Unchecked, 0.5s Time] [2021-11-25 18:06:02,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2021-11-25 18:06:02,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 452. [2021-11-25 18:06:02,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 448 states have (on average 1.1339285714285714) internal successors, (508), 451 states have internal predecessors, (508), 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) [2021-11-25 18:06:02,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 508 transitions. [2021-11-25 18:06:02,186 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 508 transitions. Word has length 44 [2021-11-25 18:06:02,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:06:02,186 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 508 transitions. [2021-11-25 18:06:02,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.90625) internal successors, (122), 64 states have internal predecessors, (122), 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) [2021-11-25 18:06:02,186 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 508 transitions. [2021-11-25 18:06:02,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 18:06:02,188 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:06:02,188 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:06:02,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-25 18:06:02,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-11-25 18:06:02,401 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:06:02,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:06:02,401 INFO L85 PathProgramCache]: Analyzing trace with hash -162192943, now seen corresponding path program 16 times [2021-11-25 18:06:02,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:06:02,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684285246] [2021-11-25 18:06:02,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:06:02,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:06:02,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:04,142 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 69 proven. 111 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:06:04,142 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:06:04,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684285246] [2021-11-25 18:06:04,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684285246] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:06:04,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351680428] [2021-11-25 18:06:04,142 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:06:04,142 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:04,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:06:04,144 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:06:04,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 18:06:04,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:04,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-25 18:06:04,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:06:04,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:06:05,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 18:06:05,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 18:06:52,456 INFO L354 Elim1Store]: treesize reduction 507, result has 9.3 percent of original size [2021-11-25 18:06:52,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 101 treesize of output 90 [2021-11-25 18:06:52,498 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 40 proven. 89 refuted. 51 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:06:52,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:06:53,217 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:06:53,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 233 treesize of output 121 [2021-11-25 18:06:53,361 INFO L354 Elim1Store]: treesize reduction 468, result has 16.3 percent of original size [2021-11-25 18:06:53,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 236 treesize of output 264 [2021-11-25 18:06:53,380 INFO L354 Elim1Store]: treesize reduction 416, result has 0.2 percent of original size [2021-11-25 18:06:53,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 98 treesize of output 64 [2021-11-25 18:06:56,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:06:56,413 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 99 proven. 81 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:06:56,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351680428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:06:56,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1656542066] [2021-11-25 18:06:56,414 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:06:56,414 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:06:56,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:06:56,415 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:06:56,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:06:56,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:56,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:56,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:06:56,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:06:56,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:06:56,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:06:56,580 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:06:56,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:06:56,876 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:00,160 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32671#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:07:00,160 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:00,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:00,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 83 [2021-11-25 18:07:00,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477190659] [2021-11-25 18:07:00,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:00,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-25 18:07:00,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:00,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-25 18:07:00,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=628, Invalid=8042, Unknown=72, NotChecked=0, Total=8742 [2021-11-25 18:07:00,162 INFO L87 Difference]: Start difference. First operand 452 states and 508 transitions. Second operand has 84 states, 84 states have (on average 1.369047619047619) internal successors, (115), 83 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:58,126 WARN L227 SmtUtils]: Spent 5.13s on a formula simplification. DAG size of input: 68 DAG size of output: 63 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:08:07,555 WARN L227 SmtUtils]: Spent 6.56s on a formula simplification. DAG size of input: 76 DAG size of output: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:08:21,424 WARN L227 SmtUtils]: Spent 6.25s on a formula simplification. DAG size of input: 86 DAG size of output: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:08:29,958 WARN L227 SmtUtils]: Spent 5.98s on a formula simplification. DAG size of input: 78 DAG size of output: 68 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:08:41,405 WARN L227 SmtUtils]: Spent 5.74s on a formula simplification. DAG size of input: 97 DAG size of output: 66 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:08:41,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:41,459 INFO L93 Difference]: Finished difference Result 794 states and 883 transitions. [2021-11-25 18:08:41,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-25 18:08:41,460 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.369047619047619) internal successors, (115), 83 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-25 18:08:41,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:41,463 INFO L225 Difference]: With dead ends: 794 [2021-11-25 18:08:41,463 INFO L226 Difference]: Without dead ends: 752 [2021-11-25 18:08:41,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 78 SyntacticMatches, 3 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 8501 ImplicationChecksByTransitivity, 152.5s TimeCoverageRelationStatistics Valid=2548, Invalid=25049, Unknown=125, NotChecked=0, Total=27722 [2021-11-25 18:08:41,464 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 1090 mSDsluCounter, 885 mSDsCounter, 0 mSdLazyCounter, 2681 mSolverCounterSat, 419 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1090 SdHoareTripleChecker+Valid, 826 SdHoareTripleChecker+Invalid, 3739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 419 IncrementalHoareTripleChecker+Valid, 2681 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 639 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:41,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1090 Valid, 826 Invalid, 3739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [419 Valid, 2681 Invalid, 0 Unknown, 639 Unchecked, 1.8s Time] [2021-11-25 18:08:41,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 752 states. [2021-11-25 18:08:41,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 752 to 471. [2021-11-25 18:08:41,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 467 states have (on average 1.1370449678800856) internal successors, (531), 470 states have internal predecessors, (531), 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) [2021-11-25 18:08:41,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 531 transitions. [2021-11-25 18:08:41,471 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 531 transitions. Word has length 46 [2021-11-25 18:08:41,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:41,472 INFO L470 AbstractCegarLoop]: Abstraction has 471 states and 531 transitions. [2021-11-25 18:08:41,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.369047619047619) internal successors, (115), 83 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:41,472 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 531 transitions. [2021-11-25 18:08:41,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 18:08:41,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:41,474 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:41,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:41,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:41,689 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:08:41,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:41,689 INFO L85 PathProgramCache]: Analyzing trace with hash 934795427, now seen corresponding path program 5 times [2021-11-25 18:08:41,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:41,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113172035] [2021-11-25 18:08:41,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:41,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:41,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:43,259 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 21 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:08:43,259 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:43,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113172035] [2021-11-25 18:08:43,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113172035] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:43,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996341186] [2021-11-25 18:08:43,260 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:08:43,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:43,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:43,261 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:43,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-25 18:08:43,670 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 18:08:43,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:08:43,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-25 18:08:43,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:43,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:08:43,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:08:44,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 13 [2021-11-25 18:08:44,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 18:08:53,345 INFO L354 Elim1Store]: treesize reduction 11, result has 83.6 percent of original size [2021-11-25 18:08:53,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 70 [2021-11-25 18:08:54,283 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:08:54,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:08:56,188 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:08:56,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 45 [2021-11-25 18:08:56,219 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:08:56,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 78 treesize of output 122 [2021-11-25 18:08:56,244 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:08:56,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 46 [2021-11-25 18:09:08,664 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:09:08,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:09:08,773 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:09:08,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996341186] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:09:08,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1931662105] [2021-11-25 18:09:08,774 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 18:09:08,774 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:08,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:08,774 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:08,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:08,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:09:08,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:09:08,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:09:08,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:09:08,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:09:08,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:09:09,004 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:09:09,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:09:09,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:09:09,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:09:09,174 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:09:09,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:09:09,329 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:09:09,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 211 treesize of output 227 [2021-11-25 18:09:09,693 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:09:09,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:09:09,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:09:09,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:09:09,841 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:09:09,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:09:10,008 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:09:10,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:09:10,145 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:09:10,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:09:10,330 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:16,060 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34431#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= |ULTIMATE.start_cstrncat_~d~0#1.offset| (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|)) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (= (mod |ULTIMATE.start_cstrncat_~n#1| 4294967296) 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483645) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (exists ((|v_ULTIMATE.start_cstrncat_#t~post5#1.base_183| Int) (|v_ULTIMATE.start_cstrncat_#t~post5#1.offset_182| Int)) (and (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_183|) |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_182|) 0)) (= (select (select |#memory_int| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrncat_~d~0#1.offset|)) (select (select |#memory_int| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_183|) |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_182|)) (<= 0 |v_ULTIMATE.start_cstrncat_#t~post5#1.base_183|) (<= (+ |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_182| 1) (select |#length| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_183|)) (= (select |#valid| |v_ULTIMATE.start_cstrncat_#t~post5#1.base_183|) 1) (<= 0 |v_ULTIMATE.start_cstrncat_#t~post5#1.offset_182|))) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (= (select |#valid| |ULTIMATE.start_cstrncat_~d~0#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:09:16,060 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:09:16,060 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:16,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 20, 20] total 65 [2021-11-25 18:09:16,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913379385] [2021-11-25 18:09:16,060 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:09:16,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-25 18:09:16,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:16,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-25 18:09:16,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=6202, Unknown=3, NotChecked=0, Total=6642 [2021-11-25 18:09:16,061 INFO L87 Difference]: Start difference. First operand 471 states and 531 transitions. Second operand has 66 states, 66 states have (on average 1.7727272727272727) internal successors, (117), 65 states have internal predecessors, (117), 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) [2021-11-25 18:09:27,805 WARN L227 SmtUtils]: Spent 6.10s on a formula simplification. DAG size of input: 47 DAG size of output: 46 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:09:59,215 WARN L227 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 45 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:10:13,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:13,078 INFO L93 Difference]: Finished difference Result 651 states and 730 transitions. [2021-11-25 18:10:13,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-25 18:10:13,078 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.7727272727272727) internal successors, (117), 65 states have internal predecessors, (117), 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 46 [2021-11-25 18:10:13,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:13,080 INFO L225 Difference]: With dead ends: 651 [2021-11-25 18:10:13,080 INFO L226 Difference]: Without dead ends: 628 [2021-11-25 18:10:13,081 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5092 ImplicationChecksByTransitivity, 73.8s TimeCoverageRelationStatistics Valid=1336, Invalid=16744, Unknown=10, NotChecked=0, Total=18090 [2021-11-25 18:10:13,081 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 132 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 1016 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 1418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1016 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 351 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:13,082 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 247 Invalid, 1418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1016 Invalid, 0 Unknown, 351 Unchecked, 0.8s Time] [2021-11-25 18:10:13,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-11-25 18:10:13,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 575. [2021-11-25 18:10:13,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 571 states have (on average 1.1453590192644483) internal successors, (654), 574 states have internal predecessors, (654), 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) [2021-11-25 18:10:13,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 654 transitions. [2021-11-25 18:10:13,091 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 654 transitions. Word has length 46 [2021-11-25 18:10:13,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:13,092 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 654 transitions. [2021-11-25 18:10:13,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 1.7727272727272727) internal successors, (117), 65 states have internal predecessors, (117), 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) [2021-11-25 18:10:13,092 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 654 transitions. [2021-11-25 18:10:13,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 18:10:13,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:13,094 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:13,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:13,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-25 18:10:13,309 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:10:13,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:13,310 INFO L85 PathProgramCache]: Analyzing trace with hash -1042380647, now seen corresponding path program 6 times [2021-11-25 18:10:13,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:13,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981057728] [2021-11-25 18:10:13,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:13,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:13,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:13,739 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 30 proven. 33 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:10:13,740 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:13,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981057728] [2021-11-25 18:10:13,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981057728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:10:13,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046306805] [2021-11-25 18:10:13,740 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:10:13,740 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:13,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:10:13,741 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:10:13,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-25 18:10:14,070 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:10:14,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:10:14,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-25 18:10:14,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:14,100 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 18:10:14,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 18:10:14,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 9 [2021-11-25 18:10:14,669 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-25 18:10:14,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 30 treesize of output 40 [2021-11-25 18:10:14,688 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-25 18:10:14,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2021-11-25 18:10:14,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-25 18:10:15,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-25 18:10:15,153 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:10:15,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:15,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 11 [2021-11-25 18:10:15,192 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 15 proven. 32 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:10:15,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:10:18,490 INFO L354 Elim1Store]: treesize reduction 16, result has 66.7 percent of original size [2021-11-25 18:10:18,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 67 treesize of output 83 [2021-11-25 18:10:18,501 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:10:18,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 47 [2021-11-25 18:10:18,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 9 treesize of output 7 [2021-11-25 18:10:18,562 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:10:18,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 35 [2021-11-25 18:10:18,612 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:10:18,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 74 [2021-11-25 18:10:19,603 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 25 proven. 22 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:10:19,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2046306805] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:10:19,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1489075406] [2021-11-25 18:10:19,604 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:10:19,604 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:10:19,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:10:19,604 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:10:19,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:10:19,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:19,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:19,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:10:19,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:19,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:19,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:19,814 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:10:19,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:10:19,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:19,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:19,986 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:10:19,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:10:20,134 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:10:20,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 211 treesize of output 227 [2021-11-25 18:10:21,026 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:10:21,028 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:10:21,030 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:10:21,122 INFO L354 Elim1Store]: treesize reduction 247, result has 19.0 percent of original size [2021-11-25 18:10:21,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 14 case distinctions, treesize of input 867 treesize of output 860 [2021-11-25 18:10:21,894 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:10:21,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:10:22,056 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:10:22,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:10:22,170 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:10:28,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36111#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (< (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.offset|) (<= 0 |#NULL.offset|) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))' at error location [2021-11-25 18:10:28,058 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:10:28,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:10:28,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21, 20] total 53 [2021-11-25 18:10:28,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346053812] [2021-11-25 18:10:28,058 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:10:28,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 18:10:28,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:28,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 18:10:28,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=336, Invalid=4351, Unknown=5, NotChecked=0, Total=4692 [2021-11-25 18:10:28,059 INFO L87 Difference]: Start difference. First operand 575 states and 654 transitions. Second operand has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 53 states have internal predecessors, (110), 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) [2021-11-25 18:10:30,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:30,503 INFO L93 Difference]: Finished difference Result 721 states and 806 transitions. [2021-11-25 18:10:30,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-25 18:10:30,504 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 53 states have internal predecessors, (110), 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 47 [2021-11-25 18:10:30,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:30,507 INFO L225 Difference]: With dead ends: 721 [2021-11-25 18:10:30,507 INFO L226 Difference]: Without dead ends: 625 [2021-11-25 18:10:30,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 89 SyntacticMatches, 4 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3972 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=961, Invalid=11244, Unknown=5, NotChecked=0, Total=12210 [2021-11-25 18:10:30,509 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 132 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 224 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:30,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 58 Invalid, 537 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 259 Invalid, 0 Unknown, 224 Unchecked, 0.2s Time] [2021-11-25 18:10:30,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-11-25 18:10:30,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 610. [2021-11-25 18:10:30,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 610 states, 606 states have (on average 1.1435643564356435) internal successors, (693), 609 states have internal predecessors, (693), 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) [2021-11-25 18:10:30,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 610 states to 610 states and 693 transitions. [2021-11-25 18:10:30,519 INFO L78 Accepts]: Start accepts. Automaton has 610 states and 693 transitions. Word has length 47 [2021-11-25 18:10:30,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:30,519 INFO L470 AbstractCegarLoop]: Abstraction has 610 states and 693 transitions. [2021-11-25 18:10:30,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 53 states have internal predecessors, (110), 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) [2021-11-25 18:10:30,520 INFO L276 IsEmpty]: Start isEmpty. Operand 610 states and 693 transitions. [2021-11-25 18:10:30,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 18:10:30,521 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:30,522 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:30,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:30,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:30,735 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:10:30,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:30,736 INFO L85 PathProgramCache]: Analyzing trace with hash 267467470, now seen corresponding path program 17 times [2021-11-25 18:10:30,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:30,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394459444] [2021-11-25 18:10:30,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:30,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:30,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:31,311 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 64 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:10:31,312 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:31,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394459444] [2021-11-25 18:10:31,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394459444] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:10:31,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908606217] [2021-11-25 18:10:31,312 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:10:31,312 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:31,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:10:31,317 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:10:31,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-25 18:10:31,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-25 18:10:31,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:10:31,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-25 18:10:31,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:31,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:31,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:10:31,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:10:32,550 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 81 proven. 119 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:10:32,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:10:33,858 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 100 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:10:33,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908606217] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:10:33,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1340019179] [2021-11-25 18:10:33,859 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:10:33,859 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:10:33,860 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:10:33,860 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:10:33,860 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:10:33,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:33,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:33,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:10:33,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:33,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:33,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:10:34,036 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-25 18:10:34,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 18:10:34,359 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:10:37,373 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37903#(and (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 |ULTIMATE.start_cstrncat_~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (< (select |#length| |ULTIMATE.start_cstrncat_~d~0#1.base|) (+ |ULTIMATE.start_cstrncat_~d~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 1 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= |ULTIMATE.start_cstrncat_~s~0#1.offset| 0))' at error location [2021-11-25 18:10:37,373 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:10:37,373 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:10:37,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 73 [2021-11-25 18:10:37,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259433286] [2021-11-25 18:10:37,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:10:37,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-25 18:10:37,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:37,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-25 18:10:37,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=800, Invalid=6172, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 18:10:37,375 INFO L87 Difference]: Start difference. First operand 610 states and 693 transitions. Second operand has 74 states, 73 states have (on average 1.9452054794520548) internal successors, (142), 74 states have internal predecessors, (142), 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) [2021-11-25 18:10:39,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:39,496 INFO L93 Difference]: Finished difference Result 1376 states and 1492 transitions. [2021-11-25 18:10:39,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 18:10:39,497 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 1.9452054794520548) internal successors, (142), 74 states have internal predecessors, (142), 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 48 [2021-11-25 18:10:39,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:39,501 INFO L225 Difference]: With dead ends: 1376 [2021-11-25 18:10:39,501 INFO L226 Difference]: Without dead ends: 1362 [2021-11-25 18:10:39,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3260 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=1922, Invalid=9420, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 18:10:39,502 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 977 mSDsluCounter, 740 mSDsCounter, 0 mSdLazyCounter, 2030 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 977 SdHoareTripleChecker+Valid, 739 SdHoareTripleChecker+Invalid, 2235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 2030 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:39,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [977 Valid, 739 Invalid, 2235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 2030 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 18:10:39,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1362 states. [2021-11-25 18:10:39,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1362 to 640. [2021-11-25 18:10:39,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 636 states have (on average 1.139937106918239) internal successors, (725), 639 states have internal predecessors, (725), 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) [2021-11-25 18:10:39,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 725 transitions. [2021-11-25 18:10:39,516 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 725 transitions. Word has length 48 [2021-11-25 18:10:39,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:39,516 INFO L470 AbstractCegarLoop]: Abstraction has 640 states and 725 transitions. [2021-11-25 18:10:39,517 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 73 states have (on average 1.9452054794520548) internal successors, (142), 74 states have internal predecessors, (142), 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) [2021-11-25 18:10:39,517 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 725 transitions. [2021-11-25 18:10:39,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 18:10:39,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:39,519 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:39,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:39,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:39,733 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:10:39,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:39,733 INFO L85 PathProgramCache]: Analyzing trace with hash -894122816, now seen corresponding path program 2 times [2021-11-25 18:10:39,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:39,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419436780] [2021-11-25 18:10:39,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:39,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:39,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:40,149 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:10:40,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:40,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419436780] [2021-11-25 18:10:40,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419436780] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:10:40,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666191040] [2021-11-25 18:10:40,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:10:40,150 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:40,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:10:40,153 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:10:40,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-25 18:10:40,420 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 18:10:40,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:10:40,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-25 18:10:40,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:40,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:10:40,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 14 treesize of output 10 [2021-11-25 18:10:40,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 18:10:40,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 18:10:40,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 18:10:40,993 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-25 18:10:40,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2021-11-25 18:10:41,019 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 11 proven. 36 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 18:10:41,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:10:41,082 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2084 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_2084) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |c_ULTIMATE.start_cstrncat_~s~0#1.offset|) 0)) is different from false [2021-11-25 18:10:41,089 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2084 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_2084) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s~0#1.offset| 1)) 0)) is different from false [2021-11-25 18:10:41,104 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2084 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_2084) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s~0#1.offset| 2)) 0)) is different from false [2021-11-25 18:10:41,120 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2084 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~d~0#1.base| v_ArrVal_2084) |c_ULTIMATE.start_cstrncat_~s~0#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s~0#1.offset| 3)) 0)) is different from false [2021-11-25 18:10:41,134 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2084 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~dst#1.base| v_ArrVal_2084) |c_ULTIMATE.start_cstrncat_~src#1.base|) (+ 3 |c_ULTIMATE.start_cstrncat_~src#1.offset|)) 0)) is different from false [2021-11-25 18:10:41,140 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:10:41,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 18:10:41,145 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:10:41,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 18:10:41,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 11 treesize of output 7 [2021-11-25 18:10:41,330 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 27 trivial. 26 not checked. [2021-11-25 18:10:41,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666191040] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:10:41,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1709589213] [2021-11-25 18:10:41,331 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:10:41,332 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:10:41,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:10:41,332 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:10:41,332 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:10:41,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:41,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:41,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 18:10:41,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:41,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:41,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:41,516 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 18:10:41,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2021-11-25 18:10:41,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:41,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:41,681 INFO L354 Elim1Store]: treesize reduction 33, result has 41.1 percent of original size [2021-11-25 18:10:41,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 192 treesize of output 197 [2021-11-25 18:10:41,873 INFO L354 Elim1Store]: treesize reduction 79, result has 36.3 percent of original size [2021-11-25 18:10:41,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 356 treesize of output 372 [2021-11-25 18:10:42,476 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 32 iterations. Over-approximation may be very coarse. [2021-11-25 18:10:42,487 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 32 iterations. Over-approximation may be very coarse. [2021-11-25 18:10:42,568 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:10:42,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:10:42,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:42,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:42,717 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-25 18:10:42,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 113 [2021-11-25 18:10:42,897 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:10:42,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:10:43,043 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-25 18:10:43,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-25 18:10:43,175 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 31 iterations. Over-approximation may be very coarse. [2021-11-25 18:10:43,186 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:10:47,871 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40304#(and (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.offset|) (<= |ULTIMATE.start_cstrncat_~dst#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~dst#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (< (select |#length| |ULTIMATE.start_cstrncat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length2~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_cstrncat_~d~0#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncat_#in~src#1.offset|) (<= |ULTIMATE.start_cstrncat_#in~dst#1.offset| 0) (<= |ULTIMATE.start_cstrncat_#in~n#1| 2147483646) (<= 0 |ULTIMATE.start_cstrncat_~src#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_#in~dst#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrncat_~n#1| 2147483646) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 1 |ULTIMATE.start_cstrncat_#in~n#1|) (<= 0 |ULTIMATE.start_cstrncat_~src#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= |ULTIMATE.start_cstrncat_~src#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 18:10:47,871 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:10:47,871 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:10:47,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 41 [2021-11-25 18:10:47,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045085160] [2021-11-25 18:10:47,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:10:47,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 18:10:47,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:47,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 18:10:47,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=2369, Unknown=5, NotChecked=510, Total=3080 [2021-11-25 18:10:47,872 INFO L87 Difference]: Start difference. First operand 640 states and 725 transitions. Second operand has 41 states, 41 states have (on average 2.5365853658536586) internal successors, (104), 41 states have internal predecessors, (104), 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) [2021-11-25 18:10:49,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:49,853 INFO L93 Difference]: Finished difference Result 1047 states and 1151 transitions. [2021-11-25 18:10:49,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-25 18:10:49,854 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.5365853658536586) internal successors, (104), 41 states have internal predecessors, (104), 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 49 [2021-11-25 18:10:49,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:49,857 INFO L225 Difference]: With dead ends: 1047 [2021-11-25 18:10:49,857 INFO L226 Difference]: Without dead ends: 803 [2021-11-25 18:10:49,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 105 SyntacticMatches, 7 SemanticMatches, 91 ConstructedPredicates, 5 IntricatePredicates, 3 DeprecatedPredicates, 2713 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=569, Invalid=7102, Unknown=5, NotChecked=880, Total=8556 [2021-11-25 18:10:49,858 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 213 mSDsluCounter, 845 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 817 SdHoareTripleChecker+Invalid, 1414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 771 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:49,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 817 Invalid, 1414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 596 Invalid, 0 Unknown, 771 Unchecked, 0.3s Time] [2021-11-25 18:10:49,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 803 states. [2021-11-25 18:10:49,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 803 to 739. [2021-11-25 18:10:49,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 739 states, 735 states have (on average 1.1306122448979592) internal successors, (831), 738 states have internal predecessors, (831), 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) [2021-11-25 18:10:49,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 739 states to 739 states and 831 transitions. [2021-11-25 18:10:49,866 INFO L78 Accepts]: Start accepts. Automaton has 739 states and 831 transitions. Word has length 49 [2021-11-25 18:10:49,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:49,866 INFO L470 AbstractCegarLoop]: Abstraction has 739 states and 831 transitions. [2021-11-25 18:10:49,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.5365853658536586) internal successors, (104), 41 states have internal predecessors, (104), 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) [2021-11-25 18:10:49,867 INFO L276 IsEmpty]: Start isEmpty. Operand 739 states and 831 transitions. [2021-11-25 18:10:49,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 18:10:49,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:49,868 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:49,902 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:50,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-25 18:10:50,093 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-25 18:10:50,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:50,094 INFO L85 PathProgramCache]: Analyzing trace with hash -661798393, now seen corresponding path program 18 times [2021-11-25 18:10:50,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:50,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702091311] [2021-11-25 18:10:50,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:50,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:50,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:53,059 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 86 proven. 134 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:10:53,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:53,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702091311] [2021-11-25 18:10:53,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702091311] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:10:53,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22706029] [2021-11-25 18:10:53,060 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:10:53,060 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:53,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:10:53,061 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:10:53,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a26a8ab7-1d04-480c-9d61-d2eb316f883d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-25 18:10:53,322 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:10:53,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:10:53,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 123 conjunts are in the unsatisfiable core [2021-11-25 18:10:53,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:53,353 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 18:10:53,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 18:10:54,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 17 treesize of output 13 [2021-11-25 18:10:54,726 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 18:10:54,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 26 [2021-11-25 18:10:54,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 18:10:54,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 11 treesize of output 3 [2021-11-25 18:10:56,521 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 18:10:56,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13