./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-cav19/array_init_nondet_vars.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/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_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-cav19/array_init_nondet_vars.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b36a429fc2ac304c1da00c90b438bd7c9bbfb7e9d7c6704fc9e7805ab1ca424f --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:37:14,890 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:37:14,893 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:37:14,962 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:37:14,963 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:37:14,964 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:37:14,966 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:37:14,969 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:37:14,972 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:37:14,973 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:37:14,975 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:37:14,976 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:37:14,977 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:37:14,979 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:37:14,981 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:37:14,982 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:37:14,984 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:37:14,985 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:37:14,988 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:37:14,991 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:37:14,994 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:37:14,995 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:37:14,997 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:37:14,998 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:37:15,003 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:37:15,004 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:37:15,004 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:37:15,006 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:37:15,006 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:37:15,008 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:37:15,008 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:37:15,009 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:37:15,010 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:37:15,011 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:37:15,013 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:37:15,013 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:37:15,014 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:37:15,014 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:37:15,015 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:37:15,016 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:37:15,017 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:37:15,018 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:37:15,069 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:37:15,069 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:37:15,070 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:37:15,070 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:37:15,077 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:37:15,078 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:37:15,078 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:37:15,078 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:37:15,078 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:37:15,079 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:37:15,079 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:37:15,079 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:37:15,079 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:37:15,079 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:37:15,080 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:37:15,080 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:37:15,081 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:37:15,081 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:37:15,082 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:37:15,082 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:37:15,083 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:37:15,083 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:37:15,083 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:37:15,083 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:37:15,083 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:37:15,084 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:37:15,085 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:37:15,085 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:37:15,086 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:37:15,086 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:37:15,086 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:37:15,086 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:37:15,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:37:15,087 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:37:15,087 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:37:15,087 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:37:15,088 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:37:15,088 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:37:15,088 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:37:15,088 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:37:15,088 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:37:15,089 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_d08c2a49-da30-4cf2-a671-8fae708c486b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b36a429fc2ac304c1da00c90b438bd7c9bbfb7e9d7c6704fc9e7805ab1ca424f [2021-11-25 20:37:15,454 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:37:15,483 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:37:15,486 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:37:15,488 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:37:15,489 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:37:15,490 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-cav19/array_init_nondet_vars.c [2021-11-25 20:37:15,597 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/data/b376c5982/7350111bdc78422ab33cafbee331cf77/FLAG8b63cc636 [2021-11-25 20:37:16,118 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:37:16,119 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/sv-benchmarks/c/array-cav19/array_init_nondet_vars.c [2021-11-25 20:37:16,130 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/data/b376c5982/7350111bdc78422ab33cafbee331cf77/FLAG8b63cc636 [2021-11-25 20:37:16,462 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/data/b376c5982/7350111bdc78422ab33cafbee331cf77 [2021-11-25 20:37:16,466 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:37:16,468 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:37:16,473 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:37:16,473 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:37:16,477 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:37:16,478 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,481 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fe3c250 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16, skipping insertion in model container [2021-11-25 20:37:16,482 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,492 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:37:16,515 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:37:16,723 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/sv-benchmarks/c/array-cav19/array_init_nondet_vars.c[413,426] [2021-11-25 20:37:16,744 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:37:16,762 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:37:16,781 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/sv-benchmarks/c/array-cav19/array_init_nondet_vars.c[413,426] [2021-11-25 20:37:16,803 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:37:16,825 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:37:16,826 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16 WrapperNode [2021-11-25 20:37:16,827 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:37:16,828 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:37:16,828 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:37:16,829 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:37:16,838 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,847 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,879 INFO L137 Inliner]: procedures = 15, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 55 [2021-11-25 20:37:16,879 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:37:16,881 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:37:16,881 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:37:16,881 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:37:16,892 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,892 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,910 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,911 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,917 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,926 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,935 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,937 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:37:16,939 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:37:16,940 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:37:16,940 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:37:16,942 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (1/1) ... [2021-11-25 20:37:16,951 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:37:16,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:16,984 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:37:17,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:37:17,048 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:37:17,048 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 20:37:17,049 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 20:37:17,049 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:37:17,049 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 20:37:17,050 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:37:17,050 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:37:17,050 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:37:17,051 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:37:17,051 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:37:17,142 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:37:17,144 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:37:17,305 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:37:17,349 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:37:17,350 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 20:37:17,352 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:37:17 BoogieIcfgContainer [2021-11-25 20:37:17,353 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:37:17,376 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:37:17,376 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:37:17,380 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:37:17,381 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:37:16" (1/3) ... [2021-11-25 20:37:17,382 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@403bf8e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:37:17, skipping insertion in model container [2021-11-25 20:37:17,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:37:16" (2/3) ... [2021-11-25 20:37:17,382 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@403bf8e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:37:17, skipping insertion in model container [2021-11-25 20:37:17,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:37:17" (3/3) ... [2021-11-25 20:37:17,400 INFO L111 eAbstractionObserver]: Analyzing ICFG array_init_nondet_vars.c [2021-11-25 20:37:17,406 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:37:17,406 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:37:17,460 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:37:17,468 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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 20:37:17,469 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:37:17,488 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 20:37:17,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 20:37:17,494 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:17,495 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:17,496 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:17,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:17,503 INFO L85 PathProgramCache]: Analyzing trace with hash 1661147299, now seen corresponding path program 1 times [2021-11-25 20:37:17,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:17,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938687681] [2021-11-25 20:37:17,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:17,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:17,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:17,773 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:37:17,774 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:17,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938687681] [2021-11-25 20:37:17,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1938687681] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:17,775 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:37:17,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:37:17,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339085959] [2021-11-25 20:37:17,778 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:17,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:37:17,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:17,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:37:17,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:37:17,819 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 20:37:17,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:17,882 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2021-11-25 20:37:17,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:37:17,885 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2021-11-25 20:37:17,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:17,893 INFO L225 Difference]: With dead ends: 32 [2021-11-25 20:37:17,894 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 20:37:17,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 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 20:37:17,902 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 8 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:17,904 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 25 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:37:17,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 20:37:17,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 16. [2021-11-25 20:37:17,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 20:37:17,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-25 20:37:17,948 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 13 [2021-11-25 20:37:17,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:17,949 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-25 20:37:17,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 20:37:17,949 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-25 20:37:17,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 20:37:17,951 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:17,951 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:17,952 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:37:17,952 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:17,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:17,953 INFO L85 PathProgramCache]: Analyzing trace with hash -279186300, now seen corresponding path program 1 times [2021-11-25 20:37:17,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:17,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697471077] [2021-11-25 20:37:17,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:17,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:18,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:18,200 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:18,201 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:18,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697471077] [2021-11-25 20:37:18,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697471077] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:18,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [336600861] [2021-11-25 20:37:18,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:18,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:18,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:18,212 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:18,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:37:18,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:18,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:37:18,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:18,572 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 20:37:18,692 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 19 treesize of output 7 [2021-11-25 20:37:18,747 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:18,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:18,856 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 16 treesize of output 14 [2021-11-25 20:37:18,866 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 32 treesize of output 28 [2021-11-25 20:37:19,131 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:19,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [336600861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:19,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [295401418] [2021-11-25 20:37:19,162 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:37:19,163 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:19,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:19,173 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:19,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:19,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:19,372 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:19,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:19,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:19,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:37:19,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:19,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:37:21,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:21,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:21,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:21,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:21,348 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:37:21,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:37:21,462 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 20 treesize of output 16 [2021-11-25 20:37:21,581 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:37:21,583 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:22,600 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '205#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:37:22,600 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:22,600 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:22,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-25 20:37:22,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550140257] [2021-11-25 20:37:22,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:22,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:37:22,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:22,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:37:22,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:37:22,605 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 10 states have internal predecessors, (18), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 20:37:22,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:22,936 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-11-25 20:37:22,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:37:22,937 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 10 states have internal predecessors, (18), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 18 [2021-11-25 20:37:22,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:22,939 INFO L225 Difference]: With dead ends: 37 [2021-11-25 20:37:22,939 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 20:37:22,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 34 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=154, Invalid=902, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:37:22,942 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 47 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:22,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 88 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:37:22,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 20:37:22,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 21. [2021-11-25 20:37:22,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 20:37:22,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-11-25 20:37:22,952 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 18 [2021-11-25 20:37:22,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:22,953 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-11-25 20:37:22,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 10 states have internal predecessors, (18), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 20:37:22,953 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-11-25 20:37:22,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 20:37:22,955 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:22,955 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:23,000 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:23,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:23,184 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:23,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:23,185 INFO L85 PathProgramCache]: Analyzing trace with hash 2118100484, now seen corresponding path program 1 times [2021-11-25 20:37:23,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:23,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801328331] [2021-11-25 20:37:23,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:23,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:23,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:23,308 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:37:23,309 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:23,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801328331] [2021-11-25 20:37:23,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801328331] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:23,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485873030] [2021-11-25 20:37:23,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:23,310 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:23,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:23,328 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:23,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:37:23,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:23,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:37:23,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:23,481 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:37:23,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:23,540 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:37:23,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485873030] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:23,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1570745501] [2021-11-25 20:37:23,544 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:37:23,545 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:23,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:23,546 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:23,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:23,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:23,692 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:23,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:23,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:23,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:37:23,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:23,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:37:25,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:25,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:25,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:25,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:25,127 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:37:25,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:37:25,244 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 20 treesize of output 16 [2021-11-25 20:37:25,477 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:37:25,479 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:26,353 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '443#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:37:26,353 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:26,353 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:26,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2021-11-25 20:37:26,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658593203] [2021-11-25 20:37:26,354 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:26,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 20:37:26,355 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:26,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 20:37:26,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:37:26,356 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 20:37:26,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:26,423 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2021-11-25 20:37:26,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:37:26,424 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 21 [2021-11-25 20:37:26,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:26,425 INFO L225 Difference]: With dead ends: 40 [2021-11-25 20:37:26,425 INFO L226 Difference]: Without dead ends: 31 [2021-11-25 20:37:26,426 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:37:26,427 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 18 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:26,427 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 52 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:37:26,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-25 20:37:26,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 19. [2021-11-25 20:37:26,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 20:37:26,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-11-25 20:37:26,434 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 21 [2021-11-25 20:37:26,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:26,435 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-11-25 20:37:26,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 20:37:26,435 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-11-25 20:37:26,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 20:37:26,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:26,436 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:26,462 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:26,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:26,644 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:26,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:26,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1891214013, now seen corresponding path program 2 times [2021-11-25 20:37:26,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:26,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200562849] [2021-11-25 20:37:26,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:26,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:26,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:26,840 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:37:26,840 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:26,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200562849] [2021-11-25 20:37:26,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200562849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:26,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344175673] [2021-11-25 20:37:26,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:37:26,841 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:26,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:26,842 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:26,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:37:26,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:37:26,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:37:26,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 20:37:26,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:27,094 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 13 treesize of output 9 [2021-11-25 20:37:27,236 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-25 20:37:27,237 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 23 treesize of output 22 [2021-11-25 20:37:27,329 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 19 treesize of output 7 [2021-11-25 20:37:27,360 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:37:27,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:27,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344175673] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:27,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1604670207] [2021-11-25 20:37:27,509 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:37:27,510 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:27,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:27,510 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:27,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:27,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:27,634 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:27,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:27,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:27,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:37:27,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:27,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:37:29,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:29,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:29,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:29,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:29,034 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:37:29,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:37:29,216 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 20 treesize of output 16 [2021-11-25 20:37:29,336 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:37:29,339 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:30,392 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '645#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (= |ULTIMATE.start_main_~i~0#1| 1) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:37:30,393 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:30,393 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:37:30,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 18 [2021-11-25 20:37:30,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315403453] [2021-11-25 20:37:30,394 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:30,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-25 20:37:30,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:30,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-25 20:37:30,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=917, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:37:30,397 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 18 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 14 states have internal predecessors, (23), 6 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 20:37:30,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:30,660 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-11-25 20:37:30,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:37:30,661 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 14 states have internal predecessors, (23), 6 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) Word has length 23 [2021-11-25 20:37:30,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:30,664 INFO L225 Difference]: With dead ends: 36 [2021-11-25 20:37:30,664 INFO L226 Difference]: Without dead ends: 34 [2021-11-25 20:37:30,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=207, Invalid=1353, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:37:30,666 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 36 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 22 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:30,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 62 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 161 Invalid, 0 Unknown, 22 Unchecked, 0.2s Time] [2021-11-25 20:37:30,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-25 20:37:30,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-11-25 20:37:30,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 20:37:30,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-11-25 20:37:30,677 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 23 [2021-11-25 20:37:30,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:30,678 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-11-25 20:37:30,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 14 states have internal predecessors, (23), 6 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 20:37:30,678 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-11-25 20:37:30,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 20:37:30,679 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:30,680 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:30,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:30,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:30,905 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:30,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:30,906 INFO L85 PathProgramCache]: Analyzing trace with hash 229839077, now seen corresponding path program 2 times [2021-11-25 20:37:30,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:30,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765171691] [2021-11-25 20:37:30,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:30,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:30,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:31,134 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:37:31,134 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:31,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765171691] [2021-11-25 20:37:31,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765171691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:31,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142102425] [2021-11-25 20:37:31,135 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:37:31,135 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:31,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:31,136 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:31,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:37:31,196 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:37:31,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:37:31,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 20:37:31,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:31,363 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 20:37:31,493 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 19 treesize of output 7 [2021-11-25 20:37:31,533 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:37:31,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:31,690 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 16 treesize of output 14 [2021-11-25 20:37:31,695 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 32 treesize of output 28 [2021-11-25 20:37:32,002 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:37:32,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142102425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:32,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [973044224] [2021-11-25 20:37:32,006 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:37:32,006 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:32,006 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:32,007 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:32,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:32,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:32,110 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:32,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:32,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:32,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:37:32,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:32,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:37:33,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:33,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:33,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:33,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:33,449 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:37:33,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:37:33,543 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 20 treesize of output 16 [2021-11-25 20:37:33,738 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:37:33,745 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:34,642 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '938#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:37:34,643 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:34,643 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:34,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 25 [2021-11-25 20:37:34,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263146140] [2021-11-25 20:37:34,644 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:34,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 20:37:34,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:34,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 20:37:34,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1169, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:37:34,646 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 25 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 20 states have internal predecessors, (37), 7 states have call successors, (8), 1 states have call predecessors, (8), 2 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-25 20:37:35,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:35,299 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2021-11-25 20:37:35,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:37:35,299 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 20 states have internal predecessors, (37), 7 states have call successors, (8), 1 states have call predecessors, (8), 2 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) Word has length 26 [2021-11-25 20:37:35,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:35,301 INFO L225 Difference]: With dead ends: 56 [2021-11-25 20:37:35,301 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 20:37:35,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=375, Invalid=2277, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 20:37:35,304 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 107 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:35,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 139 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:37:35,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 20:37:35,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 35. [2021-11-25 20:37:35,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 20:37:35,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2021-11-25 20:37:35,316 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 26 [2021-11-25 20:37:35,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:35,316 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2021-11-25 20:37:35,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 20 states have internal predecessors, (37), 7 states have call successors, (8), 1 states have call predecessors, (8), 2 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-25 20:37:35,317 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2021-11-25 20:37:35,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 20:37:35,318 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:35,318 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:35,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:35,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:35,540 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:35,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:35,540 INFO L85 PathProgramCache]: Analyzing trace with hash 260740068, now seen corresponding path program 3 times [2021-11-25 20:37:35,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:35,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054219662] [2021-11-25 20:37:35,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:35,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:35,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:35,798 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:37:35,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:35,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054219662] [2021-11-25 20:37:35,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054219662] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:35,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448688464] [2021-11-25 20:37:35,799 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:37:35,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:35,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:35,802 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:35,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:37:35,868 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:37:35,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:37:35,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 20:37:35,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:36,031 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 13 treesize of output 9 [2021-11-25 20:37:36,136 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:37:36,141 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 25 treesize of output 24 [2021-11-25 20:37:36,273 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:37:36,274 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 25 treesize of output 24 [2021-11-25 20:37:36,312 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 19 treesize of output 7 [2021-11-25 20:37:36,344 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 13 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:37:36,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:36,502 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 20 treesize of output 18 [2021-11-25 20:37:36,506 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 36 treesize of output 32 [2021-11-25 20:37:36,729 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:37:36,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448688464] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:36,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [978583493] [2021-11-25 20:37:36,734 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:37:36,734 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:36,735 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:36,735 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:36,736 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:36,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:36,835 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:37:36,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:37:36,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:36,891 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:36,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:37,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:37,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:37:38,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:38,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:38,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:38,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:38,183 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:37:38,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:37:38,283 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 20 treesize of output 16 [2021-11-25 20:37:38,400 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:37:38,402 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:39,456 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1290#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:37:39,456 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:39,456 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:39,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 11] total 20 [2021-11-25 20:37:39,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232913511] [2021-11-25 20:37:39,457 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:39,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:37:39,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:39,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:37:39,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=869, Unknown=0, NotChecked=0, Total=992 [2021-11-25 20:37:39,459 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 20 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 15 states have internal predecessors, (28), 7 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (10), 9 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 20:37:39,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:39,656 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2021-11-25 20:37:39,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:37:39,657 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 15 states have internal predecessors, (28), 7 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (10), 9 states have call predecessors, (10), 7 states have call successors, (10) Word has length 28 [2021-11-25 20:37:39,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:39,658 INFO L225 Difference]: With dead ends: 43 [2021-11-25 20:37:39,658 INFO L226 Difference]: Without dead ends: 41 [2021-11-25 20:37:39,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 9 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=143, Invalid=1047, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:37:39,660 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 14 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:39,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 79 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 133 Invalid, 0 Unknown, 21 Unchecked, 0.1s Time] [2021-11-25 20:37:39,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-25 20:37:39,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 37. [2021-11-25 20:37:39,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 20:37:39,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-25 20:37:39,670 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2021-11-25 20:37:39,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:39,670 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-25 20:37:39,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 15 states have internal predecessors, (28), 7 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (10), 9 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 20:37:39,671 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-25 20:37:39,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 20:37:39,672 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:39,673 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:39,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:39,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 20:37:39,891 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:39,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:39,892 INFO L85 PathProgramCache]: Analyzing trace with hash -1882961244, now seen corresponding path program 3 times [2021-11-25 20:37:39,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:39,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995570600] [2021-11-25 20:37:39,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:39,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:39,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:40,143 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:37:40,144 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:40,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995570600] [2021-11-25 20:37:40,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995570600] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:40,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268801736] [2021-11-25 20:37:40,144 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:37:40,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:40,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:40,151 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:40,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:37:40,221 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:37:40,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:37:40,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 20:37:40,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:40,411 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 20:37:40,517 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:37:40,517 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 25 treesize of output 24 [2021-11-25 20:37:40,591 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 19 treesize of output 7 [2021-11-25 20:37:40,619 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 9 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:37:40,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:40,742 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 23 treesize of output 21 [2021-11-25 20:37:40,746 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 39 treesize of output 35 [2021-11-25 20:37:40,967 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:37:40,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268801736] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:40,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [495746847] [2021-11-25 20:37:40,971 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:37:40,972 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:40,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:40,973 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:40,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:41,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:41,066 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:37:41,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:37:41,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:41,114 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:41,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:41,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:41,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:37:42,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:42,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:42,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:42,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:42,493 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:37:42,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:37:42,591 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 20 treesize of output 16 [2021-11-25 20:37:42,752 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:37:42,755 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:43,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1626#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:37:43,654 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:43,654 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:43,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 12] total 21 [2021-11-25 20:37:43,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050671175] [2021-11-25 20:37:43,655 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:43,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 20:37:43,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:43,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 20:37:43,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:37:43,657 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 21 states, 20 states have (on average 1.7) internal successors, (34), 17 states have internal predecessors, (34), 7 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-25 20:37:44,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:44,061 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2021-11-25 20:37:44,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:37:44,062 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.7) internal successors, (34), 17 states have internal predecessors, (34), 7 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) Word has length 31 [2021-11-25 20:37:44,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:44,063 INFO L225 Difference]: With dead ends: 52 [2021-11-25 20:37:44,063 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 20:37:44,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 67 SyntacticMatches, 6 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 596 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=255, Invalid=1815, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:37:44,066 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 46 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:44,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 121 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 233 Invalid, 0 Unknown, 12 Unchecked, 0.2s Time] [2021-11-25 20:37:44,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 20:37:44,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 37. [2021-11-25 20:37:44,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 20:37:44,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-25 20:37:44,075 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 31 [2021-11-25 20:37:44,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:44,075 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-25 20:37:44,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.7) internal successors, (34), 17 states have internal predecessors, (34), 7 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-25 20:37:44,076 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-25 20:37:44,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 20:37:44,077 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:44,077 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:44,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:44,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:44,278 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:44,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:44,279 INFO L85 PathProgramCache]: Analyzing trace with hash 1274944484, now seen corresponding path program 4 times [2021-11-25 20:37:44,279 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:44,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495627640] [2021-11-25 20:37:44,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:44,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:44,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:44,603 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:37:44,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:44,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495627640] [2021-11-25 20:37:44,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495627640] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:44,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453353001] [2021-11-25 20:37:44,604 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:37:44,604 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:44,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:44,605 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:44,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:37:44,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:44,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:37:44,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:44,892 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 13 treesize of output 9 [2021-11-25 20:37:45,040 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 19 treesize of output 7 [2021-11-25 20:37:45,073 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:37:45,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:45,213 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 16 treesize of output 14 [2021-11-25 20:37:45,216 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 32 treesize of output 28 [2021-11-25 20:37:45,500 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:37:45,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1453353001] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:45,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [277293831] [2021-11-25 20:37:45,506 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:37:45,507 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:45,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:45,508 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:45,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:45,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:45,599 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:37:45,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:37:45,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:45,646 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:45,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:45,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:45,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:37:46,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:46,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:46,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:46,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:46,857 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:37:46,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:37:46,995 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 20 treesize of output 16 [2021-11-25 20:37:47,175 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:37:47,177 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:48,252 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2022#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:37:48,253 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:48,253 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:48,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 32 [2021-11-25 20:37:48,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647114526] [2021-11-25 20:37:48,253 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:48,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:37:48,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:48,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:37:48,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1709, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 20:37:48,256 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 32 states, 30 states have (on average 1.7666666666666666) internal successors, (53), 26 states have internal predecessors, (53), 11 states have call successors, (12), 1 states have call predecessors, (12), 2 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-25 20:37:49,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:49,264 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2021-11-25 20:37:49,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:37:49,264 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 1.7666666666666666) internal successors, (53), 26 states have internal predecessors, (53), 11 states have call successors, (12), 1 states have call predecessors, (12), 2 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) Word has length 34 [2021-11-25 20:37:49,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:49,265 INFO L225 Difference]: With dead ends: 70 [2021-11-25 20:37:49,265 INFO L226 Difference]: Without dead ends: 68 [2021-11-25 20:37:49,267 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=439, Invalid=3343, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 20:37:49,268 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 75 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 531 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:49,268 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 262 Invalid, 612 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 531 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:37:49,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-25 20:37:49,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 40. [2021-11-25 20:37:49,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 20:37:49,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-11-25 20:37:49,282 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 34 [2021-11-25 20:37:49,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:49,283 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-11-25 20:37:49,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 1.7666666666666666) internal successors, (53), 26 states have internal predecessors, (53), 11 states have call successors, (12), 1 states have call predecessors, (12), 2 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-25 20:37:49,283 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-11-25 20:37:49,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 20:37:49,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:49,285 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:49,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:49,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:49,492 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:49,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:49,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1751034173, now seen corresponding path program 5 times [2021-11-25 20:37:49,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:49,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246765156] [2021-11-25 20:37:49,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:49,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:49,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:49,647 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 16 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:37:49,647 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:49,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246765156] [2021-11-25 20:37:49,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246765156] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:49,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794052102] [2021-11-25 20:37:49,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:37:49,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:49,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:49,649 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:49,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:37:49,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:37:49,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:37:49,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:37:49,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:49,885 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 26 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:37:49,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:50,011 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 26 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:37:50,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794052102] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:50,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [835127747] [2021-11-25 20:37:50,013 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:37:50,014 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:50,014 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:50,014 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:50,015 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:50,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:50,099 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:37:50,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:37:50,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:50,137 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:50,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:50,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:50,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:37:51,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:51,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:51,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:51,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:51,281 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:37:51,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:37:51,436 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 20 treesize of output 16 [2021-11-25 20:37:51,618 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:37:51,621 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:52,562 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2452#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:37:52,562 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:52,562 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:52,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2021-11-25 20:37:52,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118473708] [2021-11-25 20:37:52,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:52,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 20:37:52,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:52,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 20:37:52,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=887, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:37:52,565 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 21 states, 21 states have (on average 2.7142857142857144) internal successors, (57), 21 states have internal predecessors, (57), 6 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-25 20:37:52,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:52,863 INFO L93 Difference]: Finished difference Result 98 states and 107 transitions. [2021-11-25 20:37:52,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:37:52,864 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.7142857142857144) internal successors, (57), 21 states have internal predecessors, (57), 6 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 35 [2021-11-25 20:37:52,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:52,868 INFO L225 Difference]: With dead ends: 98 [2021-11-25 20:37:52,868 INFO L226 Difference]: Without dead ends: 70 [2021-11-25 20:37:52,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 638 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=295, Invalid=1597, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 20:37:52,873 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 65 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:52,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 135 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:37:52,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-25 20:37:52,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 48. [2021-11-25 20:37:52,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 37 states have internal predecessors, (41), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 20:37:52,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2021-11-25 20:37:52,894 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 35 [2021-11-25 20:37:52,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:52,895 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2021-11-25 20:37:52,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.7142857142857144) internal successors, (57), 21 states have internal predecessors, (57), 6 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-25 20:37:52,895 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2021-11-25 20:37:52,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 20:37:52,900 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:52,901 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:52,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:53,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:53,128 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:53,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:53,128 INFO L85 PathProgramCache]: Analyzing trace with hash 148186787, now seen corresponding path program 6 times [2021-11-25 20:37:53,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:53,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063846729] [2021-11-25 20:37:53,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:53,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:53,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:53,529 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 4 proven. 33 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:37:53,529 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:53,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063846729] [2021-11-25 20:37:53,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063846729] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:53,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196781354] [2021-11-25 20:37:53,530 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:37:53,530 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:53,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:53,534 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:53,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:37:53,618 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:37:53,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:37:53,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 20:37:53,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:53,845 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 20:37:53,986 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:37:53,987 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 25 treesize of output 24 [2021-11-25 20:37:54,103 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 19 treesize of output 7 [2021-11-25 20:37:54,131 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 12 proven. 33 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:37:54,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:54,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196781354] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:54,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1136118170] [2021-11-25 20:37:54,303 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:37:54,303 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:54,304 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:54,304 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:54,304 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:54,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:54,387 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:54,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:54,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:54,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:37:54,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:54,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:37:55,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:55,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:55,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:55,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:55,551 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:37:55,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:37:55,620 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 20 treesize of output 16 [2021-11-25 20:37:55,765 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:37:55,766 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:56,766 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2873#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:37:56,766 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:56,766 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:37:56,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 27 [2021-11-25 20:37:56,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501381232] [2021-11-25 20:37:56,766 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:56,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 20:37:56,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:56,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 20:37:56,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1622, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 20:37:56,769 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand has 27 states, 25 states have (on average 1.72) internal successors, (43), 23 states have internal predecessors, (43), 10 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-25 20:37:57,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:57,234 INFO L93 Difference]: Finished difference Result 53 states and 59 transitions. [2021-11-25 20:37:57,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 20:37:57,235 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.72) internal successors, (43), 23 states have internal predecessors, (43), 10 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) Word has length 39 [2021-11-25 20:37:57,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:57,236 INFO L225 Difference]: With dead ends: 53 [2021-11-25 20:37:57,236 INFO L226 Difference]: Without dead ends: 51 [2021-11-25 20:37:57,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 983 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=285, Invalid=2577, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 20:37:57,239 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 26 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:57,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 113 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 274 Invalid, 0 Unknown, 28 Unchecked, 0.2s Time] [2021-11-25 20:37:57,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-25 20:37:57,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-11-25 20:37:57,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 20:37:57,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-11-25 20:37:57,250 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 39 [2021-11-25 20:37:57,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:57,251 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-11-25 20:37:57,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.72) internal successors, (43), 23 states have internal predecessors, (43), 10 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-25 20:37:57,252 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-11-25 20:37:57,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 20:37:57,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:57,253 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:57,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:57,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:37:57,468 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:57,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:57,468 INFO L85 PathProgramCache]: Analyzing trace with hash -588297339, now seen corresponding path program 7 times [2021-11-25 20:37:57,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:57,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355303712] [2021-11-25 20:37:57,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:57,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:57,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:57,723 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 5 proven. 40 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:37:57,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:57,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355303712] [2021-11-25 20:37:57,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355303712] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:57,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392408219] [2021-11-25 20:37:57,724 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:37:57,724 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:57,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:57,732 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:57,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:37:57,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:57,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 20:37:57,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:58,112 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 20:37:58,241 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 19 treesize of output 7 [2021-11-25 20:37:58,267 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 5 proven. 40 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:37:58,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:58,346 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 16 treesize of output 14 [2021-11-25 20:37:58,349 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 32 treesize of output 28 [2021-11-25 20:37:58,563 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 5 proven. 40 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:37:58,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392408219] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:58,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [715629795] [2021-11-25 20:37:58,566 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:37:58,566 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:58,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:58,567 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:58,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:58,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:58,638 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:37:58,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:37:58,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:58,673 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:58,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:58,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:58,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:37:59,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:59,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:59,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:59,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:59,612 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:37:59,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:37:59,757 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 20 treesize of output 16 [2021-11-25 20:37:59,919 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:37:59,921 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:01,073 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3334#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:38:01,073 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:01,073 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:01,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2021-11-25 20:38:01,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944862825] [2021-11-25 20:38:01,074 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:01,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:38:01,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:01,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:38:01,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1271, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 20:38:01,077 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 26 states, 25 states have (on average 1.96) internal successors, (49), 22 states have internal predecessors, (49), 9 states have call successors, (10), 1 states have call predecessors, (10), 2 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2021-11-25 20:38:01,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:01,693 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2021-11-25 20:38:01,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:38:01,694 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.96) internal successors, (49), 22 states have internal predecessors, (49), 9 states have call successors, (10), 1 states have call predecessors, (10), 2 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) Word has length 42 [2021-11-25 20:38:01,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:01,694 INFO L225 Difference]: With dead ends: 65 [2021-11-25 20:38:01,695 INFO L226 Difference]: Without dead ends: 52 [2021-11-25 20:38:01,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 100 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 685 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=277, Invalid=2375, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 20:38:01,697 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 49 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 570 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:01,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 229 Invalid, 570 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:38:01,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-25 20:38:01,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 39. [2021-11-25 20:38:01,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 20:38:01,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-11-25 20:38:01,710 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 42 [2021-11-25 20:38:01,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:01,710 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-11-25 20:38:01,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.96) internal successors, (49), 22 states have internal predecessors, (49), 9 states have call successors, (10), 1 states have call predecessors, (10), 2 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2021-11-25 20:38:01,711 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-11-25 20:38:01,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 20:38:01,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:01,713 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:01,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:01,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:01,928 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:01,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:01,928 INFO L85 PathProgramCache]: Analyzing trace with hash 281148228, now seen corresponding path program 8 times [2021-11-25 20:38:01,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:01,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074439035] [2021-11-25 20:38:01,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:01,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:01,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:02,383 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 4 proven. 48 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:38:02,384 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:02,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074439035] [2021-11-25 20:38:02,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074439035] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:02,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192255010] [2021-11-25 20:38:02,384 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:38:02,384 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:02,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:02,386 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:02,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:38:02,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 20:38:02,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:02,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-25 20:38:02,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:02,675 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 20:38:02,766 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:38:02,766 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 25 treesize of output 24 [2021-11-25 20:38:02,870 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:38:02,870 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 25 treesize of output 24 [2021-11-25 20:38:03,012 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 19 treesize of output 7 [2021-11-25 20:38:03,047 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 23 proven. 45 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 20:38:03,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:03,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192255010] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:03,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [103766934] [2021-11-25 20:38:03,252 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:03,252 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:03,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:03,253 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:03,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:03,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:03,352 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:03,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:03,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:03,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:38:03,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:03,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:38:04,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:04,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:04,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:04,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:04,375 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:38:04,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:38:04,449 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 20 treesize of output 16 [2021-11-25 20:38:04,590 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:38:04,592 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:05,572 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3723#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:38:05,572 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:05,572 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:38:05,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 29 [2021-11-25 20:38:05,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836317969] [2021-11-25 20:38:05,573 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:05,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:38:05,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:05,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:38:05,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1781, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:38:05,578 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 29 states, 27 states have (on average 1.7407407407407407) internal successors, (47), 25 states have internal predecessors, (47), 12 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-25 20:38:06,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:06,179 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2021-11-25 20:38:06,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:38:06,179 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 1.7407407407407407) internal successors, (47), 25 states have internal predecessors, (47), 12 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 12 states have call successors, (13) Word has length 44 [2021-11-25 20:38:06,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:06,180 INFO L225 Difference]: With dead ends: 48 [2021-11-25 20:38:06,180 INFO L226 Difference]: Without dead ends: 46 [2021-11-25 20:38:06,182 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 71 SyntacticMatches, 7 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1298 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=327, Invalid=3095, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 20:38:06,182 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 30 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:06,182 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 182 Invalid, 462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 408 Invalid, 0 Unknown, 26 Unchecked, 0.2s Time] [2021-11-25 20:38:06,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-25 20:38:06,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2021-11-25 20:38:06,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 20:38:06,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-11-25 20:38:06,192 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 44 [2021-11-25 20:38:06,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:06,192 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-11-25 20:38:06,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 1.7407407407407407) internal successors, (47), 25 states have internal predecessors, (47), 12 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-25 20:38:06,193 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-11-25 20:38:06,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 20:38:06,194 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:06,194 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:06,227 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-25 20:38:06,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:06,400 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:06,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:06,400 INFO L85 PathProgramCache]: Analyzing trace with hash 506144580, now seen corresponding path program 9 times [2021-11-25 20:38:06,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:06,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184186181] [2021-11-25 20:38:06,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:06,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:06,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:06,663 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 5 proven. 55 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:38:06,663 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:06,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184186181] [2021-11-25 20:38:06,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184186181] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:06,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813496204] [2021-11-25 20:38:06,664 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:38:06,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:06,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:06,665 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:06,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:38:06,735 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:38:06,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:06,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 20:38:06,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:07,016 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 20:38:07,120 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:38:07,121 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 25 treesize of output 24 [2021-11-25 20:38:07,267 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 19 treesize of output 7 [2021-11-25 20:38:07,320 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 15 proven. 55 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:38:07,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:07,469 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 23 treesize of output 21 [2021-11-25 20:38:07,473 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 39 treesize of output 35 [2021-11-25 20:38:07,731 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 5 proven. 55 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:38:07,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813496204] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:07,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1439582475] [2021-11-25 20:38:07,738 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:07,739 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:07,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:07,740 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:07,740 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:07,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:07,809 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:38:07,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:38:07,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:07,851 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:07,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:08,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:08,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:38:08,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:08,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:08,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:08,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:08,957 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:38:08,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:38:09,116 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 20 treesize of output 16 [2021-11-25 20:38:09,294 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:38:09,296 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:10,463 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4210#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:38:10,464 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:10,464 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:10,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 16] total 29 [2021-11-25 20:38:10,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771975712] [2021-11-25 20:38:10,464 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:10,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:38:10,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:10,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:38:10,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1482, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 20:38:10,467 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 25 states have internal predecessors, (54), 11 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-25 20:38:10,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:10,905 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2021-11-25 20:38:10,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 20:38:10,906 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 25 states have internal predecessors, (54), 11 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) Word has length 47 [2021-11-25 20:38:10,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:10,907 INFO L225 Difference]: With dead ends: 65 [2021-11-25 20:38:10,907 INFO L226 Difference]: Without dead ends: 63 [2021-11-25 20:38:10,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 114 SyntacticMatches, 6 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 687 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=210, Invalid=2046, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 20:38:10,909 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 28 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:10,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 168 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 446 Invalid, 0 Unknown, 42 Unchecked, 0.3s Time] [2021-11-25 20:38:10,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-25 20:38:10,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 52. [2021-11-25 20:38:10,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 37 states have internal predecessors, (40), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 20:38:10,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-11-25 20:38:10,925 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 47 [2021-11-25 20:38:10,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:10,925 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-11-25 20:38:10,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 25 states have internal predecessors, (54), 11 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-25 20:38:10,926 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-11-25 20:38:10,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 20:38:10,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:10,933 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:10,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:11,150 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 20:38:11,150 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:11,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:11,151 INFO L85 PathProgramCache]: Analyzing trace with hash -1071482044, now seen corresponding path program 10 times [2021-11-25 20:38:11,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:11,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869533623] [2021-11-25 20:38:11,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:11,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:11,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:11,537 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 6 proven. 65 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:38:11,538 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:11,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869533623] [2021-11-25 20:38:11,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [869533623] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:11,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630001623] [2021-11-25 20:38:11,538 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:38:11,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:11,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:11,544 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:11,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:38:11,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:11,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 20:38:11,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:11,923 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 20:38:12,107 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 19 treesize of output 7 [2021-11-25 20:38:12,142 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 6 proven. 65 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:38:12,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:12,240 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 16 treesize of output 14 [2021-11-25 20:38:12,242 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 32 treesize of output 28 [2021-11-25 20:38:12,472 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 6 proven. 65 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:38:12,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1630001623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:12,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1885121669] [2021-11-25 20:38:12,474 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:12,474 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:12,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:12,475 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:12,475 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:12,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:12,559 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:12,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:12,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:12,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:38:12,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:12,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:38:13,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:13,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:13,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:13,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:13,437 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:38:13,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:38:13,504 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 20 treesize of output 16 [2021-11-25 20:38:13,633 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:38:13,635 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:14,529 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4739#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:38:14,529 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:14,529 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:14,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 32 [2021-11-25 20:38:14,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080490107] [2021-11-25 20:38:14,529 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:14,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:38:14,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:14,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:38:14,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1734, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 20:38:14,531 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 32 states, 30 states have (on average 2.033333333333333) internal successors, (61), 27 states have internal predecessors, (61), 12 states have call successors, (13), 1 states have call predecessors, (13), 2 states have return successors, (14), 14 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-25 20:38:15,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:15,332 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2021-11-25 20:38:15,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 20:38:15,332 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 2.033333333333333) internal successors, (61), 27 states have internal predecessors, (61), 12 states have call successors, (13), 1 states have call predecessors, (13), 2 states have return successors, (14), 14 states have call predecessors, (14), 12 states have call successors, (14) Word has length 50 [2021-11-25 20:38:15,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:15,333 INFO L225 Difference]: With dead ends: 85 [2021-11-25 20:38:15,334 INFO L226 Difference]: Without dead ends: 83 [2021-11-25 20:38:15,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 121 SyntacticMatches, 4 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1039 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=360, Invalid=3546, Unknown=0, NotChecked=0, Total=3906 [2021-11-25 20:38:15,336 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 112 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 700 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 828 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 700 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:15,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 306 Invalid, 828 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 700 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:38:15,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-25 20:38:15,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 55. [2021-11-25 20:38:15,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 20:38:15,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-11-25 20:38:15,356 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 50 [2021-11-25 20:38:15,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:15,358 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-11-25 20:38:15,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 2.033333333333333) internal successors, (61), 27 states have internal predecessors, (61), 12 states have call successors, (13), 1 states have call predecessors, (13), 2 states have return successors, (14), 14 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-25 20:38:15,359 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-11-25 20:38:15,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 20:38:15,360 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:15,360 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 6, 6, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:15,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:15,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:38:15,568 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:15,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:15,568 INFO L85 PathProgramCache]: Analyzing trace with hash 1695402725, now seen corresponding path program 11 times [2021-11-25 20:38:15,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:15,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855616077] [2021-11-25 20:38:15,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:15,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:15,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:15,899 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 5 proven. 73 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 20:38:15,900 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:15,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855616077] [2021-11-25 20:38:15,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855616077] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:15,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481723070] [2021-11-25 20:38:15,900 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:38:15,900 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:15,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:15,907 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:15,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:38:16,065 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 20:38:16,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:16,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 20:38:16,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:16,353 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 20:38:16,426 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:38:16,426 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 25 treesize of output 24 [2021-11-25 20:38:16,520 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:38:16,521 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 25 treesize of output 24 [2021-11-25 20:38:16,625 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 19 treesize of output 7 [2021-11-25 20:38:16,649 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 28 proven. 70 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 20:38:16,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:16,800 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 20 treesize of output 18 [2021-11-25 20:38:16,805 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 36 treesize of output 32 [2021-11-25 20:38:17,028 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 5 proven. 73 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 20:38:17,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [481723070] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:17,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1118140448] [2021-11-25 20:38:17,031 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:17,031 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:17,031 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:17,031 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:17,031 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:17,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:17,115 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:38:17,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:38:17,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:17,150 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:17,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:17,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:17,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:38:18,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:18,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:18,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:18,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:18,073 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:38:18,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:38:18,199 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 20 treesize of output 16 [2021-11-25 20:38:18,319 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:38:18,321 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:19,357 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5327#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:38:19,357 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:19,358 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:19,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 17] total 30 [2021-11-25 20:38:19,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503937557] [2021-11-25 20:38:19,358 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:19,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-25 20:38:19,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:19,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-25 20:38:19,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1558, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 20:38:19,361 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 30 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 26 states have internal predecessors, (57), 12 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2021-11-25 20:38:19,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:19,881 INFO L93 Difference]: Finished difference Result 74 states and 78 transitions. [2021-11-25 20:38:19,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 20:38:19,882 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 26 states have internal predecessors, (57), 12 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) Word has length 52 [2021-11-25 20:38:19,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:19,883 INFO L225 Difference]: With dead ends: 74 [2021-11-25 20:38:19,883 INFO L226 Difference]: Without dead ends: 72 [2021-11-25 20:38:19,885 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 123 SyntacticMatches, 9 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=241, Invalid=2411, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 20:38:19,886 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 32 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 579 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 579 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:19,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 260 Invalid, 657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 579 Invalid, 0 Unknown, 35 Unchecked, 0.3s Time] [2021-11-25 20:38:19,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-25 20:38:19,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 55. [2021-11-25 20:38:19,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 20:38:19,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-11-25 20:38:19,900 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 52 [2021-11-25 20:38:19,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:19,901 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-11-25 20:38:19,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 26 states have internal predecessors, (57), 12 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2021-11-25 20:38:19,901 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-11-25 20:38:19,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-25 20:38:19,902 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:19,902 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:19,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:20,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 20:38:20,128 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:20,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:20,128 INFO L85 PathProgramCache]: Analyzing trace with hash -319117500, now seen corresponding path program 12 times [2021-11-25 20:38:20,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:20,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372366137] [2021-11-25 20:38:20,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:20,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:20,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:20,295 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 27 proven. 48 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:38:20,295 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:20,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372366137] [2021-11-25 20:38:20,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372366137] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:20,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285046366] [2021-11-25 20:38:20,296 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:38:20,296 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:20,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:20,297 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:20,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:38:20,376 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:38:20,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:20,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:38:20,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:20,606 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 40 proven. 35 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:38:20,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:20,727 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 40 proven. 35 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:38:20,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285046366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:20,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2134426175] [2021-11-25 20:38:20,729 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:20,729 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:20,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:20,730 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:20,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:20,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:20,842 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:20,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:20,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:20,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:38:21,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:21,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:38:21,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:21,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:21,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:21,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:21,904 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:38:21,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:38:21,979 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 20 treesize of output 16 [2021-11-25 20:38:22,109 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:38:22,111 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:22,788 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5881#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:38:22,788 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:22,788 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:22,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2021-11-25 20:38:22,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296301037] [2021-11-25 20:38:22,789 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:22,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 20:38:22,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:22,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 20:38:22,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=951, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:38:22,791 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 22 states, 22 states have (on average 2.590909090909091) internal successors, (57), 22 states have internal predecessors, (57), 7 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-25 20:38:22,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:22,987 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2021-11-25 20:38:22,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:38:22,988 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.590909090909091) internal successors, (57), 22 states have internal predecessors, (57), 7 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 53 [2021-11-25 20:38:22,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:22,989 INFO L225 Difference]: With dead ends: 86 [2021-11-25 20:38:22,989 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 20:38:22,991 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=236, Invalid=1246, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 20:38:22,991 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:22,992 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 110 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:38:22,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 20:38:23,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 52. [2021-11-25 20:38:23,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 20:38:23,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2021-11-25 20:38:23,008 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 53 [2021-11-25 20:38:23,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:23,008 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2021-11-25 20:38:23,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.590909090909091) internal successors, (57), 22 states have internal predecessors, (57), 7 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-25 20:38:23,009 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2021-11-25 20:38:23,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 20:38:23,010 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:23,011 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:23,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:23,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:38:23,224 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:23,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:23,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1067309053, now seen corresponding path program 13 times [2021-11-25 20:38:23,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:23,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994509740] [2021-11-25 20:38:23,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:23,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:23,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:23,654 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 6 proven. 83 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 20:38:23,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:23,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994509740] [2021-11-25 20:38:23,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994509740] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:23,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689887038] [2021-11-25 20:38:23,655 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:38:23,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:23,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:23,660 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:23,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:38:23,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:23,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-25 20:38:23,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:24,103 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 20:38:24,214 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:38:24,214 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 25 treesize of output 24 [2021-11-25 20:38:24,403 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 19 treesize of output 7 [2021-11-25 20:38:24,434 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 18 proven. 83 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:38:24,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:24,565 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 23 treesize of output 21 [2021-11-25 20:38:24,568 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 39 treesize of output 35 [2021-11-25 20:38:24,885 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 6 proven. 83 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 20:38:24,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689887038] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:24,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [651073906] [2021-11-25 20:38:24,887 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:24,888 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:24,888 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:24,888 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:24,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:24,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:24,971 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:24,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:24,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:24,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:38:25,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:25,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:38:25,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:25,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:25,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:25,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:25,945 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:38:25,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:38:26,017 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 20 treesize of output 16 [2021-11-25 20:38:26,201 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:38:26,207 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:27,379 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6462#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:38:27,379 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:27,379 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:27,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 18] total 35 [2021-11-25 20:38:27,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282907704] [2021-11-25 20:38:27,380 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:27,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:38:27,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:27,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:38:27,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1979, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 20:38:27,382 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand has 35 states, 33 states have (on average 2.0) internal successors, (66), 30 states have internal predecessors, (66), 14 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (16), 16 states have call predecessors, (16), 14 states have call successors, (16) [2021-11-25 20:38:27,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:27,912 INFO L93 Difference]: Finished difference Result 76 states and 81 transitions. [2021-11-25 20:38:27,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 20:38:27,913 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 2.0) internal successors, (66), 30 states have internal predecessors, (66), 14 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (16), 16 states have call predecessors, (16), 14 states have call successors, (16) Word has length 55 [2021-11-25 20:38:27,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:27,915 INFO L225 Difference]: With dead ends: 76 [2021-11-25 20:38:27,915 INFO L226 Difference]: Without dead ends: 74 [2021-11-25 20:38:27,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 136 SyntacticMatches, 6 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 922 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=240, Invalid=2730, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 20:38:27,917 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 38 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 670 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 670 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:27,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 256 Invalid, 729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 670 Invalid, 0 Unknown, 32 Unchecked, 0.4s Time] [2021-11-25 20:38:27,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-25 20:38:27,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 60. [2021-11-25 20:38:27,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 9 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 20:38:27,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-11-25 20:38:27,931 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 55 [2021-11-25 20:38:27,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:27,932 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-11-25 20:38:27,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 2.0) internal successors, (66), 30 states have internal predecessors, (66), 14 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (16), 16 states have call predecessors, (16), 14 states have call successors, (16) [2021-11-25 20:38:27,932 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-11-25 20:38:27,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 20:38:27,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:27,933 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:27,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:28,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 20:38:28,160 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:28,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:28,160 INFO L85 PathProgramCache]: Analyzing trace with hash -555594203, now seen corresponding path program 14 times [2021-11-25 20:38:28,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:28,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930408975] [2021-11-25 20:38:28,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:28,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:28,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:28,542 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 7 proven. 96 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 20:38:28,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:28,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930408975] [2021-11-25 20:38:28,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930408975] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:28,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404799286] [2021-11-25 20:38:28,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:38:28,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:28,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:28,544 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:28,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 20:38:28,773 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 20:38:28,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:28,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 20:38:28,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:29,158 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 15 treesize of output 11 [2021-11-25 20:38:29,670 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-25 20:38:29,670 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 25 treesize of output 12 [2021-11-25 20:38:29,725 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 42 proven. 61 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 20:38:29,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:30,368 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 20 treesize of output 18 [2021-11-25 20:38:30,373 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 42 treesize of output 36 [2021-11-25 20:38:31,034 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 37 proven. 66 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 20:38:31,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [404799286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:31,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [624382330] [2021-11-25 20:38:31,036 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:31,036 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:31,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:31,036 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:31,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:31,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:31,107 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:38:31,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:38:31,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:31,139 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:31,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:31,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:31,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:38:32,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:32,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:32,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:32,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:32,296 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:38:32,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:38:32,422 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 20 treesize of output 16 [2021-11-25 20:38:32,596 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:38:32,599 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:33,875 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7087#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:38:33,875 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:33,876 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:33,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 49 [2021-11-25 20:38:33,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790660155] [2021-11-25 20:38:33,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:33,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-25 20:38:33,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:33,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-25 20:38:33,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=3318, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:38:33,879 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 49 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 44 states have internal predecessors, (97), 19 states have call successors, (20), 1 states have call predecessors, (20), 2 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) [2021-11-25 20:38:35,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:35,011 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2021-11-25 20:38:35,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 20:38:35,012 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 44 states have internal predecessors, (97), 19 states have call successors, (20), 1 states have call predecessors, (20), 2 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) Word has length 58 [2021-11-25 20:38:35,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:35,013 INFO L225 Difference]: With dead ends: 78 [2021-11-25 20:38:35,013 INFO L226 Difference]: Without dead ends: 57 [2021-11-25 20:38:35,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2157 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=698, Invalid=6612, Unknown=0, NotChecked=0, Total=7310 [2021-11-25 20:38:35,015 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 6 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:35,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 266 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 285 Invalid, 0 Unknown, 63 Unchecked, 0.2s Time] [2021-11-25 20:38:35,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-25 20:38:35,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-25 20:38:35,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 9 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 20:38:35,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2021-11-25 20:38:35,029 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 58 [2021-11-25 20:38:35,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:35,029 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2021-11-25 20:38:35,030 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 44 states have internal predecessors, (97), 19 states have call successors, (20), 1 states have call predecessors, (20), 2 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) [2021-11-25 20:38:35,030 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2021-11-25 20:38:35,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 20:38:35,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:35,031 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 7, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:35,064 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:35,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:38:35,244 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:35,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:35,244 INFO L85 PathProgramCache]: Analyzing trace with hash -688153948, now seen corresponding path program 15 times [2021-11-25 20:38:35,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:35,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604316486] [2021-11-25 20:38:35,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:35,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:35,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:35,633 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 6 proven. 104 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:38:35,634 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:35,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604316486] [2021-11-25 20:38:35,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604316486] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:35,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808097188] [2021-11-25 20:38:35,634 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:38:35,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:35,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:35,635 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:35,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 20:38:35,726 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:38:35,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:35,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-25 20:38:35,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:36,108 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 13 treesize of output 9 [2021-11-25 20:38:36,221 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:38:36,221 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 25 treesize of output 24 [2021-11-25 20:38:36,370 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:38:36,370 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 25 treesize of output 24 [2021-11-25 20:38:36,549 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 19 treesize of output 7 [2021-11-25 20:38:36,581 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 33 proven. 101 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-25 20:38:36,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:36,770 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 20 treesize of output 18 [2021-11-25 20:38:36,773 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 36 treesize of output 32 [2021-11-25 20:38:37,067 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 6 proven. 104 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:38:37,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808097188] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:37,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1455731048] [2021-11-25 20:38:37,069 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:37,069 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:37,070 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:37,070 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:37,070 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:37,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:37,151 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:38:37,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:38:37,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:37,188 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:37,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:37,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:37,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:38:38,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:38,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:38,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:38,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:38,163 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:38:38,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:38:38,231 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 20 treesize of output 16 [2021-11-25 20:38:38,358 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:38:38,360 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:39,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7746#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:38:39,468 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:39,468 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:39,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 19] total 36 [2021-11-25 20:38:39,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182550265] [2021-11-25 20:38:39,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:39,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 20:38:39,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:39,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 20:38:39,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2067, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 20:38:39,471 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 36 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 31 states have internal predecessors, (69), 15 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (18), 17 states have call predecessors, (18), 15 states have call successors, (18) [2021-11-25 20:38:40,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:40,137 INFO L93 Difference]: Finished difference Result 68 states and 71 transitions. [2021-11-25 20:38:40,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 20:38:40,138 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 31 states have internal predecessors, (69), 15 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (18), 17 states have call predecessors, (18), 15 states have call successors, (18) Word has length 60 [2021-11-25 20:38:40,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:40,139 INFO L225 Difference]: With dead ends: 68 [2021-11-25 20:38:40,139 INFO L226 Difference]: Without dead ends: 66 [2021-11-25 20:38:40,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 144 SyntacticMatches, 9 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1118 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=274, Invalid=3148, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 20:38:40,140 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 29 mSDsluCounter, 379 mSDsCounter, 0 mSdLazyCounter, 895 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 965 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 895 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:40,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 376 Invalid, 965 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 895 Invalid, 0 Unknown, 21 Unchecked, 0.5s Time] [2021-11-25 20:38:40,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-25 20:38:40,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 60. [2021-11-25 20:38:40,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 9 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 20:38:40,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2021-11-25 20:38:40,150 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 60 [2021-11-25 20:38:40,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:40,150 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2021-11-25 20:38:40,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 31 states have internal predecessors, (69), 15 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (18), 17 states have call predecessors, (18), 15 states have call successors, (18) [2021-11-25 20:38:40,151 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2021-11-25 20:38:40,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 20:38:40,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:40,152 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 7, 7, 7, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:40,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:40,352 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:40,353 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:40,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:40,353 INFO L85 PathProgramCache]: Analyzing trace with hash -909849628, now seen corresponding path program 16 times [2021-11-25 20:38:40,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:40,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1890026638] [2021-11-25 20:38:40,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:40,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:40,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:40,747 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 7 proven. 117 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:38:40,748 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:40,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1890026638] [2021-11-25 20:38:40,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1890026638] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:40,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999796732] [2021-11-25 20:38:40,748 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:38:40,749 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:40,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:40,752 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:40,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 20:38:40,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:40,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-25 20:38:40,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:41,198 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 13 treesize of output 9 [2021-11-25 20:38:41,329 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:38:41,330 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 25 treesize of output 24 [2021-11-25 20:38:41,554 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 19 treesize of output 7 [2021-11-25 20:38:41,586 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 20:38:41,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:41,780 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 23 treesize of output 21 [2021-11-25 20:38:41,784 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 39 treesize of output 35 [2021-11-25 20:38:42,098 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 7 proven. 117 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:38:42,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999796732] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:42,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1236669221] [2021-11-25 20:38:42,099 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:42,100 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:42,100 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:42,100 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:42,100 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:42,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:42,178 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:42,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:42,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:42,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:38:42,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:42,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:38:43,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:43,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:43,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:43,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:43,229 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:38:43,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:38:43,350 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 20 treesize of output 16 [2021-11-25 20:38:43,489 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:38:43,491 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:44,652 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8378#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:38:44,652 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:44,652 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:44,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 20] total 37 [2021-11-25 20:38:44,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838557988] [2021-11-25 20:38:44,653 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:44,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 20:38:44,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:44,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 20:38:44,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=2162, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:38:44,655 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand has 37 states, 36 states have (on average 2.0555555555555554) internal successors, (74), 33 states have internal predecessors, (74), 15 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (17), 17 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-25 20:38:45,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:45,158 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2021-11-25 20:38:45,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 20:38:45,160 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 2.0555555555555554) internal successors, (74), 33 states have internal predecessors, (74), 15 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (17), 17 states have call predecessors, (17), 15 states have call successors, (17) Word has length 63 [2021-11-25 20:38:45,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:45,161 INFO L225 Difference]: With dead ends: 68 [2021-11-25 20:38:45,161 INFO L226 Difference]: Without dead ends: 66 [2021-11-25 20:38:45,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 161 SyntacticMatches, 6 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=274, Invalid=3266, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 20:38:45,163 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 47 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 554 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:45,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 219 Invalid, 642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 554 Invalid, 0 Unknown, 43 Unchecked, 0.3s Time] [2021-11-25 20:38:45,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-25 20:38:45,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2021-11-25 20:38:45,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 9 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 20:38:45,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2021-11-25 20:38:45,177 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 63 [2021-11-25 20:38:45,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:45,178 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2021-11-25 20:38:45,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 2.0555555555555554) internal successors, (74), 33 states have internal predecessors, (74), 15 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (17), 17 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-25 20:38:45,178 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2021-11-25 20:38:45,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 20:38:45,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:45,180 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:45,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:45,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:45,396 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:45,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:45,396 INFO L85 PathProgramCache]: Analyzing trace with hash 213848740, now seen corresponding path program 17 times [2021-11-25 20:38:45,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:45,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207302099] [2021-11-25 20:38:45,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:45,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:45,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:45,819 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 8 proven. 133 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:38:45,820 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:45,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207302099] [2021-11-25 20:38:45,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207302099] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:45,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835441732] [2021-11-25 20:38:45,820 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:38:45,821 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:45,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:45,824 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:45,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 20:38:46,272 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-25 20:38:46,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:46,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-25 20:38:46,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:46,709 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 13 treesize of output 9 [2021-11-25 20:38:47,093 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 19 treesize of output 7 [2021-11-25 20:38:47,131 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 8 proven. 133 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:38:47,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:47,531 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 16 treesize of output 14 [2021-11-25 20:38:47,534 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 32 treesize of output 28 [2021-11-25 20:38:48,112 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 8 proven. 133 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:38:48,112 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835441732] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:48,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [295823797] [2021-11-25 20:38:48,113 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:48,113 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:48,114 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:48,114 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:48,114 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:48,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:48,200 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:38:48,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:38:48,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:48,237 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:48,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:48,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:48,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:38:49,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:49,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:49,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:49,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:49,213 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:38:49,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:38:49,368 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 20 treesize of output 16 [2021-11-25 20:38:49,504 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:38:49,506 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:50,823 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9058#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:38:50,823 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:50,824 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:50,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 55 [2021-11-25 20:38:50,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897114570] [2021-11-25 20:38:50,824 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:50,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-25 20:38:50,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:50,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-25 20:38:50,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=423, Invalid=3999, Unknown=0, NotChecked=0, Total=4422 [2021-11-25 20:38:50,826 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 55 states, 54 states have (on average 2.074074074074074) internal successors, (112), 50 states have internal predecessors, (112), 22 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (24), 24 states have call predecessors, (24), 22 states have call successors, (24) [2021-11-25 20:38:53,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:53,097 INFO L93 Difference]: Finished difference Result 124 states and 137 transitions. [2021-11-25 20:38:53,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-25 20:38:53,099 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 2.074074074074074) internal successors, (112), 50 states have internal predecessors, (112), 22 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (24), 24 states have call predecessors, (24), 22 states have call successors, (24) Word has length 66 [2021-11-25 20:38:53,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:53,100 INFO L225 Difference]: With dead ends: 124 [2021-11-25 20:38:53,100 INFO L226 Difference]: Without dead ends: 122 [2021-11-25 20:38:53,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 152 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3509 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=1225, Invalid=10117, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 20:38:53,102 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 181 mSDsluCounter, 392 mSDsCounter, 0 mSdLazyCounter, 1194 mSolverCounterSat, 281 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 1475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 281 IncrementalHoareTripleChecker+Valid, 1194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:53,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 397 Invalid, 1475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [281 Valid, 1194 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:38:53,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-25 20:38:53,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 90. [2021-11-25 20:38:53,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 10 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 20:38:53,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 95 transitions. [2021-11-25 20:38:53,119 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 95 transitions. Word has length 66 [2021-11-25 20:38:53,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:53,119 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 95 transitions. [2021-11-25 20:38:53,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 2.074074074074074) internal successors, (112), 50 states have internal predecessors, (112), 22 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (24), 24 states have call predecessors, (24), 22 states have call successors, (24) [2021-11-25 20:38:53,120 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 95 transitions. [2021-11-25 20:38:53,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 20:38:53,121 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:53,121 INFO L514 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 8, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:53,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:53,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-25 20:38:53,324 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:53,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:53,324 INFO L85 PathProgramCache]: Analyzing trace with hash -18652829, now seen corresponding path program 18 times [2021-11-25 20:38:53,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:53,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854114516] [2021-11-25 20:38:53,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:53,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:53,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:53,706 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 8 proven. 157 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 20:38:53,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:53,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854114516] [2021-11-25 20:38:53,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854114516] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:53,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146746055] [2021-11-25 20:38:53,706 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:38:53,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:53,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:53,708 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:53,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 20:38:53,835 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:38:53,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:53,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-25 20:38:53,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:54,276 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 20:38:54,416 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:38:54,416 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 25 treesize of output 24 [2021-11-25 20:38:54,695 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 19 treesize of output 7 [2021-11-25 20:38:54,732 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 24 proven. 157 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:38:54,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:54,884 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 23 treesize of output 21 [2021-11-25 20:38:54,888 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 39 treesize of output 35 [2021-11-25 20:38:55,229 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 8 proven. 157 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 20:38:55,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146746055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:55,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [350517443] [2021-11-25 20:38:55,231 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:38:55,231 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:55,232 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:55,232 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:55,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:55,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:55,336 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:38:55,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:38:55,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:55,378 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:55,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:55,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:55,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:38:56,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:56,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:56,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:56,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:56,333 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:38:56,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:38:56,456 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 20 treesize of output 16 [2021-11-25 20:38:56,593 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:38:56,595 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:57,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9917#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:38:57,867 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:57,867 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:57,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 22] total 41 [2021-11-25 20:38:57,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498671684] [2021-11-25 20:38:57,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:57,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 20:38:57,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:57,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 20:38:57,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=2550, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 20:38:57,869 INFO L87 Difference]: Start difference. First operand 90 states and 95 transitions. Second operand has 41 states, 40 states have (on average 2.1) internal successors, (84), 37 states have internal predecessors, (84), 17 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) [2021-11-25 20:38:59,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:59,045 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2021-11-25 20:38:59,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-25 20:38:59,046 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 2.1) internal successors, (84), 37 states have internal predecessors, (84), 17 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) Word has length 71 [2021-11-25 20:38:59,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:59,048 INFO L225 Difference]: With dead ends: 122 [2021-11-25 20:38:59,048 INFO L226 Difference]: Without dead ends: 120 [2021-11-25 20:38:59,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 189 SyntacticMatches, 7 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1872 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=478, Invalid=5684, Unknown=0, NotChecked=0, Total=6162 [2021-11-25 20:38:59,050 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 93 mSDsluCounter, 496 mSDsCounter, 0 mSdLazyCounter, 1025 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 1171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 1025 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:59,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 496 Invalid, 1171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 1025 Invalid, 0 Unknown, 52 Unchecked, 0.6s Time] [2021-11-25 20:38:59,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-25 20:38:59,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 92. [2021-11-25 20:38:59,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 73 states have internal predecessors, (76), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 20:38:59,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 96 transitions. [2021-11-25 20:38:59,068 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 96 transitions. Word has length 71 [2021-11-25 20:38:59,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:59,069 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 96 transitions. [2021-11-25 20:38:59,069 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 2.1) internal successors, (84), 37 states have internal predecessors, (84), 17 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) [2021-11-25 20:38:59,069 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 96 transitions. [2021-11-25 20:38:59,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 20:38:59,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:59,071 INFO L514 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:59,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:59,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:59,280 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:59,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:59,280 INFO L85 PathProgramCache]: Analyzing trace with hash -1630136123, now seen corresponding path program 19 times [2021-11-25 20:38:59,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:59,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896628083] [2021-11-25 20:38:59,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:59,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:59,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:59,719 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 9 proven. 176 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 20:38:59,720 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:59,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896628083] [2021-11-25 20:38:59,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896628083] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:59,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609480390] [2021-11-25 20:38:59,720 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:38:59,720 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:59,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:59,722 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:59,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 20:38:59,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:59,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 20:38:59,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:00,346 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 20:39:00,675 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 19 treesize of output 7 [2021-11-25 20:39:00,711 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 9 proven. 176 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 20:39:00,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:00,834 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 16 treesize of output 14 [2021-11-25 20:39:00,837 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 32 treesize of output 28 [2021-11-25 20:39:01,155 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 9 proven. 176 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 20:39:01,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609480390] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:01,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [710622743] [2021-11-25 20:39:01,157 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:39:01,157 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:01,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:01,158 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:01,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:01,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:01,232 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:39:01,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:39:01,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:01,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:39:01,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:01,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:39:02,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:02,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:02,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:02,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:02,206 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:39:02,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:39:02,287 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 20 treesize of output 16 [2021-11-25 20:39:02,420 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:39:02,421 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:03,547 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10782#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:39:03,547 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:03,547 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:03,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 42 [2021-11-25 20:39:03,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333820495] [2021-11-25 20:39:03,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:03,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-25 20:39:03,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:03,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-25 20:39:03,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=2671, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 20:39:03,549 INFO L87 Difference]: Start difference. First operand 92 states and 96 transitions. Second operand has 42 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 38 states have internal predecessors, (89), 17 states have call successors, (18), 1 states have call predecessors, (18), 2 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) [2021-11-25 20:39:05,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:05,243 INFO L93 Difference]: Finished difference Result 155 states and 162 transitions. [2021-11-25 20:39:05,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 20:39:05,244 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 38 states have internal predecessors, (89), 17 states have call successors, (18), 1 states have call predecessors, (18), 2 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) Word has length 74 [2021-11-25 20:39:05,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:05,245 INFO L225 Difference]: With dead ends: 155 [2021-11-25 20:39:05,245 INFO L226 Difference]: Without dead ends: 153 [2021-11-25 20:39:05,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 188 SyntacticMatches, 4 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1807 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=489, Invalid=6153, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 20:39:05,248 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 56 mSDsluCounter, 715 mSDsCounter, 0 mSdLazyCounter, 1857 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 722 SdHoareTripleChecker+Invalid, 1946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 1857 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:05,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 722 Invalid, 1946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 1857 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 20:39:05,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-11-25 20:39:05,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 95. [2021-11-25 20:39:05,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 75 states have internal predecessors, (79), 11 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 20:39:05,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 101 transitions. [2021-11-25 20:39:05,273 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 101 transitions. Word has length 74 [2021-11-25 20:39:05,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:05,274 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 101 transitions. [2021-11-25 20:39:05,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 38 states have internal predecessors, (89), 17 states have call successors, (18), 1 states have call predecessors, (18), 2 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) [2021-11-25 20:39:05,274 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 101 transitions. [2021-11-25 20:39:05,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-25 20:39:05,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:05,276 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:05,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:05,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:05,492 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:05,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:05,492 INFO L85 PathProgramCache]: Analyzing trace with hash -184512989, now seen corresponding path program 20 times [2021-11-25 20:39:05,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:05,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469592760] [2021-11-25 20:39:05,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:05,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:05,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:05,727 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 78 proven. 114 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-25 20:39:05,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:05,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469592760] [2021-11-25 20:39:05,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [469592760] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:05,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338525702] [2021-11-25 20:39:05,727 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:39:05,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:05,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:05,730 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:05,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 20:39:06,095 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-25 20:39:06,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:06,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:39:06,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:06,535 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 100 proven. 92 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-25 20:39:06,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:06,750 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 100 proven. 92 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-25 20:39:06,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338525702] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:06,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [868043757] [2021-11-25 20:39:06,753 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:39:06,753 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:06,753 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:06,753 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:06,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:06,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:06,845 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:39:06,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:39:06,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:06,894 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:39:06,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:39:07,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:07,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:39:07,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:07,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:07,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:07,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:07,840 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:39:07,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:39:07,968 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 20 treesize of output 16 [2021-11-25 20:39:08,133 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:39:08,135 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:09,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11694#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:39:09,126 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:09,126 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:09,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2021-11-25 20:39:09,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38078085] [2021-11-25 20:39:09,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:09,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 20:39:09,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:09,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 20:39:09,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=1524, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 20:39:09,128 INFO L87 Difference]: Start difference. First operand 95 states and 101 transitions. Second operand has 31 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 31 states have internal predecessors, (81), 10 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-25 20:39:09,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:09,594 INFO L93 Difference]: Finished difference Result 158 states and 165 transitions. [2021-11-25 20:39:09,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 20:39:09,595 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 31 states have internal predecessors, (81), 10 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 77 [2021-11-25 20:39:09,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:09,599 INFO L225 Difference]: With dead ends: 158 [2021-11-25 20:39:09,599 INFO L226 Difference]: Without dead ends: 87 [2021-11-25 20:39:09,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1046 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=571, Invalid=2851, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 20:39:09,602 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 145 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:09,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 137 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:39:09,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-25 20:39:09,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 74. [2021-11-25 20:39:09,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 11 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 20:39:09,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 78 transitions. [2021-11-25 20:39:09,621 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 78 transitions. Word has length 77 [2021-11-25 20:39:09,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:09,622 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 78 transitions. [2021-11-25 20:39:09,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 31 states have internal predecessors, (81), 10 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-25 20:39:09,623 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 78 transitions. [2021-11-25 20:39:09,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 20:39:09,624 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:09,624 INFO L514 BasicCegarLoop]: trace histogram [11, 9, 9, 9, 9, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:09,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:09,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-25 20:39:09,844 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:09,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:09,844 INFO L85 PathProgramCache]: Analyzing trace with hash -1512359804, now seen corresponding path program 21 times [2021-11-25 20:39:09,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:09,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714388287] [2021-11-25 20:39:09,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:09,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:09,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:10,409 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 9 proven. 203 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 20:39:10,409 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:10,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714388287] [2021-11-25 20:39:10,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714388287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:10,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221593584] [2021-11-25 20:39:10,410 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:39:10,410 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:10,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:10,416 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:10,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 20:39:10,572 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:39:10,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:10,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 20:39:10,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:11,194 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 20:39:11,309 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:39:11,309 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 25 treesize of output 24 [2021-11-25 20:39:11,613 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 19 treesize of output 7 [2021-11-25 20:39:11,646 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 27 proven. 203 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 20:39:11,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:11,813 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 23 treesize of output 21 [2021-11-25 20:39:11,817 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 39 treesize of output 35 [2021-11-25 20:39:12,162 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 9 proven. 203 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 20:39:12,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221593584] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:12,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2107329603] [2021-11-25 20:39:12,163 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:39:12,163 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:12,164 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:12,164 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:12,164 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:12,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:12,231 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:39:12,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:39:12,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:12,262 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:39:12,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:39:12,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:12,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:39:13,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:13,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:13,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:13,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:13,256 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:39:13,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:39:13,382 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 20 treesize of output 16 [2021-11-25 20:39:13,567 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:39:13,570 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:14,851 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12586#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:39:14,851 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:14,851 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:14,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 24] total 47 [2021-11-25 20:39:14,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321992770] [2021-11-25 20:39:14,852 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:14,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-25 20:39:14,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:14,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-25 20:39:14,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=3191, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 20:39:14,854 INFO L87 Difference]: Start difference. First operand 74 states and 78 transitions. Second operand has 47 states, 45 states have (on average 2.1333333333333333) internal successors, (96), 42 states have internal predecessors, (96), 20 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (22), 22 states have call predecessors, (22), 20 states have call successors, (22) [2021-11-25 20:39:15,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:15,667 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2021-11-25 20:39:15,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 20:39:15,668 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 45 states have (on average 2.1333333333333333) internal successors, (96), 42 states have internal predecessors, (96), 20 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (22), 22 states have call predecessors, (22), 20 states have call successors, (22) Word has length 79 [2021-11-25 20:39:15,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:15,669 INFO L225 Difference]: With dead ends: 84 [2021-11-25 20:39:15,669 INFO L226 Difference]: Without dead ends: 82 [2021-11-25 20:39:15,670 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 199 SyntacticMatches, 6 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1495 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=312, Invalid=4518, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 20:39:15,670 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 36 mSDsluCounter, 535 mSDsCounter, 0 mSdLazyCounter, 1351 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 531 SdHoareTripleChecker+Invalid, 1454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 1351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:15,671 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 531 Invalid, 1454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 1351 Invalid, 0 Unknown, 37 Unchecked, 0.6s Time] [2021-11-25 20:39:15,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-25 20:39:15,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 79. [2021-11-25 20:39:15,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 20:39:15,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2021-11-25 20:39:15,688 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 79 [2021-11-25 20:39:15,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:15,689 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2021-11-25 20:39:15,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 45 states have (on average 2.1333333333333333) internal successors, (96), 42 states have internal predecessors, (96), 20 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (22), 22 states have call predecessors, (22), 20 states have call successors, (22) [2021-11-25 20:39:15,689 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2021-11-25 20:39:15,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 20:39:15,690 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:15,690 INFO L514 BasicCegarLoop]: trace histogram [11, 9, 9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:15,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:15,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 20:39:15,891 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:15,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:15,891 INFO L85 PathProgramCache]: Analyzing trace with hash -498474492, now seen corresponding path program 22 times [2021-11-25 20:39:15,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:15,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2127144088] [2021-11-25 20:39:15,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:15,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:15,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:16,365 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 10 proven. 225 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 20:39:16,365 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:16,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2127144088] [2021-11-25 20:39:16,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2127144088] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:16,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1603156532] [2021-11-25 20:39:16,366 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:39:16,366 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:16,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:16,367 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:16,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 20:39:16,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:16,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-25 20:39:16,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:17,004 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 20:39:17,363 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 19 treesize of output 7 [2021-11-25 20:39:17,398 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 10 proven. 225 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 20:39:17,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:17,527 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 16 treesize of output 14 [2021-11-25 20:39:17,530 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 32 treesize of output 28 [2021-11-25 20:39:17,864 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 10 proven. 225 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 20:39:17,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1603156532] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:17,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1217337119] [2021-11-25 20:39:17,866 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:39:17,866 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:17,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:17,867 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:17,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:17,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:17,948 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:39:17,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:39:17,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:17,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:39:18,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:18,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:39:18,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:18,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:18,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:18,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:18,782 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:39:18,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:39:18,837 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 20 treesize of output 16 [2021-11-25 20:39:18,956 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:39:18,957 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:19,902 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13396#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:39:19,902 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:19,902 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:19,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 46 [2021-11-25 20:39:19,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458383982] [2021-11-25 20:39:19,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:19,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 20:39:19,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:19,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 20:39:19,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=3101, Unknown=0, NotChecked=0, Total=3306 [2021-11-25 20:39:19,904 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand has 46 states, 45 states have (on average 2.2) internal successors, (99), 42 states have internal predecessors, (99), 19 states have call successors, (20), 1 states have call predecessors, (20), 2 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) [2021-11-25 20:39:21,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:21,510 INFO L93 Difference]: Finished difference Result 125 states and 131 transitions. [2021-11-25 20:39:21,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-25 20:39:21,511 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.2) internal successors, (99), 42 states have internal predecessors, (99), 19 states have call successors, (20), 1 states have call predecessors, (20), 2 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) Word has length 82 [2021-11-25 20:39:21,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:21,512 INFO L225 Difference]: With dead ends: 125 [2021-11-25 20:39:21,513 INFO L226 Difference]: Without dead ends: 123 [2021-11-25 20:39:21,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 210 SyntacticMatches, 4 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2152 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=536, Invalid=7296, Unknown=0, NotChecked=0, Total=7832 [2021-11-25 20:39:21,515 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 104 mSDsluCounter, 648 mSDsCounter, 0 mSdLazyCounter, 1829 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 649 SdHoareTripleChecker+Invalid, 1989 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 1829 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:21,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 649 Invalid, 1989 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 1829 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:39:21,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-25 20:39:21,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 85. [2021-11-25 20:39:21,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 63 states have (on average 1.0476190476190477) internal successors, (66), 63 states have internal predecessors, (66), 12 states have call successors, (12), 9 states have call predecessors, (12), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 20:39:21,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 90 transitions. [2021-11-25 20:39:21,539 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 90 transitions. Word has length 82 [2021-11-25 20:39:21,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:21,540 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 90 transitions. [2021-11-25 20:39:21,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.2) internal successors, (99), 42 states have internal predecessors, (99), 19 states have call successors, (20), 1 states have call predecessors, (20), 2 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) [2021-11-25 20:39:21,540 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 90 transitions. [2021-11-25 20:39:21,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-25 20:39:21,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:21,542 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:21,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:21,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-25 20:39:21,764 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:21,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:21,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1948829828, now seen corresponding path program 23 times [2021-11-25 20:39:21,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:21,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547520404] [2021-11-25 20:39:21,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:21,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:21,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:22,032 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 101 proven. 142 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-25 20:39:22,032 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:22,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547520404] [2021-11-25 20:39:22,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547520404] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:22,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835204036] [2021-11-25 20:39:22,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:39:22,032 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:22,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:22,033 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:22,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 20:39:22,325 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-25 20:39:22,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:22,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:39:22,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:22,721 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 126 proven. 117 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-25 20:39:22,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:22,902 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 126 proven. 117 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-25 20:39:22,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835204036] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:22,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1126245027] [2021-11-25 20:39:22,904 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:39:22,904 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:22,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:22,905 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:22,905 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:22,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:22,985 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:39:22,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:39:22,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:23,021 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:39:23,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:39:23,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:23,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:39:23,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:23,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:23,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:23,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:23,979 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:39:23,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:39:24,097 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 20 treesize of output 16 [2021-11-25 20:39:24,220 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:39:24,222 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:25,186 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14314#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:39:25,187 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:25,187 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:25,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2021-11-25 20:39:25,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795903432] [2021-11-25 20:39:25,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:25,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 20:39:25,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:25,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 20:39:25,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1743, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:39:25,189 INFO L87 Difference]: Start difference. First operand 85 states and 90 transitions. Second operand has 34 states, 34 states have (on average 2.6176470588235294) internal successors, (89), 34 states have internal predecessors, (89), 11 states have call successors, (12), 1 states have call predecessors, (12), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-11-25 20:39:25,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:25,503 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2021-11-25 20:39:25,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:39:25,504 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.6176470588235294) internal successors, (89), 34 states have internal predecessors, (89), 11 states have call successors, (12), 1 states have call predecessors, (12), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 85 [2021-11-25 20:39:25,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:25,505 INFO L225 Difference]: With dead ends: 128 [2021-11-25 20:39:25,505 INFO L226 Difference]: Without dead ends: 95 [2021-11-25 20:39:25,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 231 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 948 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=498, Invalid=2472, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 20:39:25,506 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 90 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:25,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 157 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:39:25,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-25 20:39:25,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 82. [2021-11-25 20:39:25,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 12 states have call successors, (12), 9 states have call predecessors, (12), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 20:39:25,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-11-25 20:39:25,524 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 85 [2021-11-25 20:39:25,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:25,525 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-11-25 20:39:25,525 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.6176470588235294) internal successors, (89), 34 states have internal predecessors, (89), 11 states have call successors, (12), 1 states have call predecessors, (12), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-11-25 20:39:25,525 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-11-25 20:39:25,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-25 20:39:25,526 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:25,527 INFO L514 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 10, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:25,560 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:25,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 20:39:25,740 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:25,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:25,740 INFO L85 PathProgramCache]: Analyzing trace with hash -53554493, now seen corresponding path program 24 times [2021-11-25 20:39:25,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:25,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565093721] [2021-11-25 20:39:25,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:25,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:25,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:26,262 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 10 proven. 255 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-25 20:39:26,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:26,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565093721] [2021-11-25 20:39:26,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1565093721] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:26,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525300776] [2021-11-25 20:39:26,263 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:39:26,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:26,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:26,265 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:26,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 20:39:26,394 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:39:26,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:26,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-25 20:39:26,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:26,954 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 20:39:27,085 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:39:27,085 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 25 treesize of output 24 [2021-11-25 20:39:27,478 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 19 treesize of output 7 [2021-11-25 20:39:27,516 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 30 proven. 255 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 20:39:27,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:27,694 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 23 treesize of output 21 [2021-11-25 20:39:27,697 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 39 treesize of output 35 [2021-11-25 20:39:28,029 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 10 proven. 255 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-25 20:39:28,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525300776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:28,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1356482122] [2021-11-25 20:39:28,030 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:39:28,031 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:28,031 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:28,031 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:28,031 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:28,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:28,132 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:39:28,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:39:28,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:28,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:39:28,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:28,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:39:29,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:29,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:29,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:29,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:29,025 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:39:29,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:39:29,090 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 20 treesize of output 16 [2021-11-25 20:39:29,217 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:39:29,218 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:30,307 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15215#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:39:30,307 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:30,307 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:30,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 26] total 49 [2021-11-25 20:39:30,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533531131] [2021-11-25 20:39:30,308 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:30,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-25 20:39:30,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:30,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-25 20:39:30,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=3422, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:39:30,309 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 49 states, 48 states have (on average 2.1666666666666665) internal successors, (104), 45 states have internal predecessors, (104), 21 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) [2021-11-25 20:39:31,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:31,334 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2021-11-25 20:39:31,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 20:39:31,335 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 2.1666666666666665) internal successors, (104), 45 states have internal predecessors, (104), 21 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) Word has length 87 [2021-11-25 20:39:31,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:31,336 INFO L225 Difference]: With dead ends: 92 [2021-11-25 20:39:31,336 INFO L226 Difference]: Without dead ends: 90 [2021-11-25 20:39:31,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 221 SyntacticMatches, 6 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1711 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=346, Invalid=5204, Unknown=0, NotChecked=0, Total=5550 [2021-11-25 20:39:31,337 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 51 mSDsluCounter, 683 mSDsCounter, 0 mSdLazyCounter, 1684 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 652 SdHoareTripleChecker+Invalid, 1839 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 1684 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:31,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 652 Invalid, 1839 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 1684 Invalid, 0 Unknown, 59 Unchecked, 0.8s Time] [2021-11-25 20:39:31,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-25 20:39:31,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 87. [2021-11-25 20:39:31,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 64 states have (on average 1.03125) internal successors, (66), 64 states have internal predecessors, (66), 12 states have call successors, (12), 10 states have call predecessors, (12), 10 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 20:39:31,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2021-11-25 20:39:31,359 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 87 [2021-11-25 20:39:31,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:31,359 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2021-11-25 20:39:31,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 2.1666666666666665) internal successors, (104), 45 states have internal predecessors, (104), 21 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) [2021-11-25 20:39:31,360 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2021-11-25 20:39:31,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-25 20:39:31,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:31,361 INFO L514 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:31,395 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2021-11-25 20:39:31,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 20:39:31,576 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:31,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:31,576 INFO L85 PathProgramCache]: Analyzing trace with hash -2003522715, now seen corresponding path program 25 times [2021-11-25 20:39:31,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:31,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176466547] [2021-11-25 20:39:31,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:31,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:31,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:32,146 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 11 proven. 280 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-25 20:39:32,146 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:32,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [176466547] [2021-11-25 20:39:32,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [176466547] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:32,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790525291] [2021-11-25 20:39:32,146 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:39:32,147 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:32,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:32,147 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:32,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 20:39:32,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:32,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-25 20:39:32,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:32,918 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 20:39:33,357 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 19 treesize of output 7 [2021-11-25 20:39:33,391 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 11 proven. 280 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-25 20:39:33,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:33,512 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 16 treesize of output 14 [2021-11-25 20:39:33,514 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 32 treesize of output 28 [2021-11-25 20:39:33,822 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 11 proven. 280 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-25 20:39:33,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790525291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:33,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [658455968] [2021-11-25 20:39:33,823 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:39:33,823 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:33,824 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:33,824 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:33,824 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:33,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:33,905 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:39:33,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:39:33,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:33,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:39:34,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:34,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:39:34,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:34,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:34,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:34,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:34,846 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:39:34,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:39:34,969 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 20 treesize of output 16 [2021-11-25 20:39:35,117 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:39:35,119 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:36,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16106#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:39:36,366 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:36,366 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:36,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 50 [2021-11-25 20:39:36,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387786644] [2021-11-25 20:39:36,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:36,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-25 20:39:36,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:36,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-25 20:39:36,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=3563, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 20:39:36,369 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand has 50 states, 49 states have (on average 2.2244897959183674) internal successors, (109), 46 states have internal predecessors, (109), 21 states have call successors, (22), 1 states have call predecessors, (22), 2 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) [2021-11-25 20:39:38,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:38,173 INFO L93 Difference]: Finished difference Result 136 states and 142 transitions. [2021-11-25 20:39:38,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-25 20:39:38,174 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 2.2244897959183674) internal successors, (109), 46 states have internal predecessors, (109), 21 states have call successors, (22), 1 states have call predecessors, (22), 2 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) Word has length 90 [2021-11-25 20:39:38,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:38,175 INFO L225 Difference]: With dead ends: 136 [2021-11-25 20:39:38,175 INFO L226 Difference]: Without dead ends: 134 [2021-11-25 20:39:38,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 232 SyntacticMatches, 4 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2520 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=583, Invalid=8537, Unknown=0, NotChecked=0, Total=9120 [2021-11-25 20:39:38,177 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 106 mSDsluCounter, 694 mSDsCounter, 0 mSdLazyCounter, 2052 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 698 SdHoareTripleChecker+Invalid, 2235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 2052 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:38,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 698 Invalid, 2235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 2052 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 20:39:38,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-25 20:39:38,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 93. [2021-11-25 20:39:38,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 69 states have internal predecessors, (72), 13 states have call successors, (13), 10 states have call predecessors, (13), 10 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-25 20:39:38,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 98 transitions. [2021-11-25 20:39:38,196 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 98 transitions. Word has length 90 [2021-11-25 20:39:38,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:38,197 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 98 transitions. [2021-11-25 20:39:38,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 2.2244897959183674) internal successors, (109), 46 states have internal predecessors, (109), 21 states have call successors, (22), 1 states have call predecessors, (22), 2 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) [2021-11-25 20:39:38,197 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 98 transitions. [2021-11-25 20:39:38,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 20:39:38,198 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:38,198 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:38,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:38,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 20:39:38,399 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:38,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:38,399 INFO L85 PathProgramCache]: Analyzing trace with hash 220821379, now seen corresponding path program 26 times [2021-11-25 20:39:38,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:38,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337632289] [2021-11-25 20:39:38,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:38,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:38,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:38,692 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 127 proven. 173 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-25 20:39:38,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:38,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337632289] [2021-11-25 20:39:38,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337632289] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:38,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034535639] [2021-11-25 20:39:38,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:39:38,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:38,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:38,694 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:38,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 20:39:39,352 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-25 20:39:39,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:39,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:39:39,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:39,867 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 155 proven. 145 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-25 20:39:39,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:40,070 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 155 proven. 145 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-25 20:39:40,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034535639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:40,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2098309955] [2021-11-25 20:39:40,071 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:39:40,071 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:40,072 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:40,072 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:40,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:40,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:40,143 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:39:40,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:39:40,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:40,179 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:39:40,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:39:40,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:40,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:39:41,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:41,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:41,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:41,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:41,075 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:39:41,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:39:41,181 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 20 treesize of output 16 [2021-11-25 20:39:41,313 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:39:41,315 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:42,381 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17109#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:39:42,381 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:42,381 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:42,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2021-11-25 20:39:42,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477943573] [2021-11-25 20:39:42,382 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:42,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 20:39:42,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:42,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 20:39:42,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=1976, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:39:42,383 INFO L87 Difference]: Start difference. First operand 93 states and 98 transitions. Second operand has 37 states, 37 states have (on average 2.6216216216216215) internal successors, (97), 37 states have internal predecessors, (97), 12 states have call successors, (13), 1 states have call predecessors, (13), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-25 20:39:42,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:42,773 INFO L93 Difference]: Finished difference Result 139 states and 145 transitions. [2021-11-25 20:39:42,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 20:39:42,774 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.6216216216216215) internal successors, (97), 37 states have internal predecessors, (97), 12 states have call successors, (13), 1 states have call predecessors, (13), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) Word has length 93 [2021-11-25 20:39:42,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:42,776 INFO L225 Difference]: With dead ends: 139 [2021-11-25 20:39:42,776 INFO L226 Difference]: Without dead ends: 103 [2021-11-25 20:39:42,777 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 254 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1084 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=581, Invalid=2841, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 20:39:42,778 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 109 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 351 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:42,778 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 193 Invalid, 422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 351 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:39:42,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-25 20:39:42,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 90. [2021-11-25 20:39:42,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 13 states have call successors, (13), 10 states have call predecessors, (13), 10 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-25 20:39:42,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-11-25 20:39:42,802 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 93 [2021-11-25 20:39:42,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:42,802 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-11-25 20:39:42,803 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.6216216216216215) internal successors, (97), 37 states have internal predecessors, (97), 12 states have call successors, (13), 1 states have call predecessors, (13), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-25 20:39:42,803 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-11-25 20:39:42,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-25 20:39:42,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:42,804 INFO L514 BasicCegarLoop]: trace histogram [13, 11, 11, 11, 11, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:42,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:43,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:43,019 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:43,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:43,019 INFO L85 PathProgramCache]: Analyzing trace with hash -1506251484, now seen corresponding path program 27 times [2021-11-25 20:39:43,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:43,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619118838] [2021-11-25 20:39:43,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:43,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:43,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:43,567 INFO L134 CoverageAnalysis]: Checked inductivity of 458 backedges. 11 proven. 313 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-25 20:39:43,567 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:43,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619118838] [2021-11-25 20:39:43,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619118838] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:43,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969783267] [2021-11-25 20:39:43,567 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:39:43,567 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:43,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:43,568 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:43,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 20:39:43,730 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:39:43,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:43,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 20:39:43,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:44,465 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 20:39:44,642 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:39:44,642 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 25 treesize of output 24 [2021-11-25 20:39:45,110 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 19 treesize of output 7 [2021-11-25 20:39:45,154 INFO L134 CoverageAnalysis]: Checked inductivity of 458 backedges. 33 proven. 313 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-25 20:39:45,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:45,377 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 23 treesize of output 21 [2021-11-25 20:39:45,382 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 39 treesize of output 35 [2021-11-25 20:39:45,776 INFO L134 CoverageAnalysis]: Checked inductivity of 458 backedges. 11 proven. 313 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-25 20:39:45,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1969783267] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:45,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1325704206] [2021-11-25 20:39:45,779 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:39:45,780 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:45,780 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:45,780 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:45,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:45,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:45,849 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:39:45,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:39:45,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:45,885 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:39:45,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:39:46,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:46,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:39:46,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:46,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:46,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:46,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:46,891 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:39:46,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:39:46,967 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 20 treesize of output 16 [2021-11-25 20:39:47,093 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:39:47,094 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:48,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18092#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:39:48,436 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:48,436 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:48,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 28] total 53 [2021-11-25 20:39:48,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578153201] [2021-11-25 20:39:48,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:48,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 20:39:48,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:48,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 20:39:48,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=3906, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 20:39:48,439 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 53 states, 52 states have (on average 2.1923076923076925) internal successors, (114), 49 states have internal predecessors, (114), 23 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (25), 25 states have call predecessors, (25), 23 states have call successors, (25) [2021-11-25 20:39:49,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:49,660 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2021-11-25 20:39:49,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 20:39:49,660 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 2.1923076923076925) internal successors, (114), 49 states have internal predecessors, (114), 23 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (25), 25 states have call predecessors, (25), 23 states have call successors, (25) Word has length 95 [2021-11-25 20:39:49,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:49,662 INFO L225 Difference]: With dead ends: 100 [2021-11-25 20:39:49,662 INFO L226 Difference]: Without dead ends: 98 [2021-11-25 20:39:49,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 243 SyntacticMatches, 6 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1949 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=370, Invalid=5950, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 20:39:49,663 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 33 mSDsluCounter, 810 mSDsCounter, 0 mSdLazyCounter, 1915 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 805 SdHoareTripleChecker+Invalid, 2024 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 1915 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:49,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 805 Invalid, 2024 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 1915 Invalid, 0 Unknown, 36 Unchecked, 0.9s Time] [2021-11-25 20:39:49,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-25 20:39:49,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 95. [2021-11-25 20:39:49,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 13 states have call successors, (13), 11 states have call predecessors, (13), 11 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-25 20:39:49,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2021-11-25 20:39:49,684 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 95 [2021-11-25 20:39:49,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:49,685 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2021-11-25 20:39:49,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 2.1923076923076925) internal successors, (114), 49 states have internal predecessors, (114), 23 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (25), 25 states have call predecessors, (25), 23 states have call successors, (25) [2021-11-25 20:39:49,685 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2021-11-25 20:39:49,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-25 20:39:49,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:49,687 INFO L514 BasicCegarLoop]: trace histogram [13, 11, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:49,716 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:49,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-25 20:39:49,900 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:49,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:49,900 INFO L85 PathProgramCache]: Analyzing trace with hash 1085860196, now seen corresponding path program 28 times [2021-11-25 20:39:49,900 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:49,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927913991] [2021-11-25 20:39:49,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:49,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:49,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:50,549 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 12 proven. 341 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-25 20:39:50,549 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:50,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927913991] [2021-11-25 20:39:50,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927913991] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:50,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59295722] [2021-11-25 20:39:50,549 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:39:50,550 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:50,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:50,550 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:50,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 20:39:50,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:50,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-25 20:39:50,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:51,502 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 20:39:52,038 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 19 treesize of output 7 [2021-11-25 20:39:52,082 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 12 proven. 341 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-25 20:39:52,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:52,253 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 16 treesize of output 14 [2021-11-25 20:39:52,256 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 32 treesize of output 28 [2021-11-25 20:39:52,686 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 12 proven. 341 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-25 20:39:52,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59295722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:52,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1956183991] [2021-11-25 20:39:52,687 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:39:52,688 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:52,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:52,688 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:52,688 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:52,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:52,797 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:39:52,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:39:52,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:52,841 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:39:52,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:39:53,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:53,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:39:53,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:53,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:53,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:53,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:53,793 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:39:53,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:39:53,954 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 20 treesize of output 16 [2021-11-25 20:39:54,139 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:39:54,141 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:55,693 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19063#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:39:55,693 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:55,693 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:55,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 56 [2021-11-25 20:39:55,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550615486] [2021-11-25 20:39:55,694 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:55,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-25 20:39:55,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:55,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-25 20:39:55,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=4314, Unknown=0, NotChecked=0, Total=4556 [2021-11-25 20:39:55,695 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand has 56 states, 54 states have (on average 2.240740740740741) internal successors, (121), 51 states have internal predecessors, (121), 24 states have call successors, (25), 1 states have call predecessors, (25), 2 states have return successors, (26), 26 states have call predecessors, (26), 24 states have call successors, (26) [2021-11-25 20:39:58,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:58,234 INFO L93 Difference]: Finished difference Result 147 states and 153 transitions. [2021-11-25 20:39:58,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-25 20:39:58,235 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 54 states have (on average 2.240740740740741) internal successors, (121), 51 states have internal predecessors, (121), 24 states have call successors, (25), 1 states have call predecessors, (25), 2 states have return successors, (26), 26 states have call predecessors, (26), 24 states have call successors, (26) Word has length 98 [2021-11-25 20:39:58,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:58,236 INFO L225 Difference]: With dead ends: 147 [2021-11-25 20:39:58,236 INFO L226 Difference]: Without dead ends: 145 [2021-11-25 20:39:58,237 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 253 SyntacticMatches, 4 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3022 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=642, Invalid=10278, Unknown=0, NotChecked=0, Total=10920 [2021-11-25 20:39:58,238 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 106 mSDsluCounter, 1054 mSDsCounter, 0 mSdLazyCounter, 2723 mSolverCounterSat, 188 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 1044 SdHoareTripleChecker+Invalid, 2911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 188 IncrementalHoareTripleChecker+Valid, 2723 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:58,238 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 1044 Invalid, 2911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [188 Valid, 2723 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-25 20:39:58,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-25 20:39:58,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 101. [2021-11-25 20:39:58,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 75 states have (on average 1.04) internal successors, (78), 75 states have internal predecessors, (78), 14 states have call successors, (14), 11 states have call predecessors, (14), 11 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 20:39:58,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 106 transitions. [2021-11-25 20:39:58,263 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 106 transitions. Word has length 98 [2021-11-25 20:39:58,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:58,263 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 106 transitions. [2021-11-25 20:39:58,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 54 states have (on average 2.240740740740741) internal successors, (121), 51 states have internal predecessors, (121), 24 states have call successors, (25), 1 states have call predecessors, (25), 2 states have return successors, (26), 26 states have call predecessors, (26), 24 states have call successors, (26) [2021-11-25 20:39:58,264 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 106 transitions. [2021-11-25 20:39:58,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-25 20:39:58,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:58,265 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:58,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:58,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-25 20:39:58,472 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:39:58,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:58,472 INFO L85 PathProgramCache]: Analyzing trace with hash -827063004, now seen corresponding path program 29 times [2021-11-25 20:39:58,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:58,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642783514] [2021-11-25 20:39:58,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:58,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:58,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:58,834 INFO L134 CoverageAnalysis]: Checked inductivity of 519 backedges. 156 proven. 207 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-25 20:39:58,834 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:58,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642783514] [2021-11-25 20:39:58,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642783514] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:58,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326893266] [2021-11-25 20:39:58,834 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:39:58,835 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:58,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:58,836 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:58,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 20:39:59,671 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-25 20:39:59,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:59,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:39:59,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:00,209 INFO L134 CoverageAnalysis]: Checked inductivity of 519 backedges. 187 proven. 176 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-25 20:40:00,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:00,463 INFO L134 CoverageAnalysis]: Checked inductivity of 519 backedges. 187 proven. 176 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-25 20:40:00,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326893266] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:00,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253553308] [2021-11-25 20:40:00,465 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:40:00,465 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:00,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:00,466 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:00,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:00,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:00,567 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:40:00,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:40:00,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:00,611 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:40:00,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:40:00,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:00,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:40:01,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:01,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:01,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:01,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:01,558 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:40:01,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:40:01,650 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 20 treesize of output 16 [2021-11-25 20:40:01,775 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:40:01,776 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:02,810 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20151#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:40:02,810 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:02,810 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:02,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2021-11-25 20:40:02,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738275768] [2021-11-25 20:40:02,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:02,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 20:40:02,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:02,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 20:40:02,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=429, Invalid=2223, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 20:40:02,813 INFO L87 Difference]: Start difference. First operand 101 states and 106 transitions. Second operand has 40 states, 40 states have (on average 2.625) internal successors, (105), 40 states have internal predecessors, (105), 13 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2021-11-25 20:40:03,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:03,331 INFO L93 Difference]: Finished difference Result 150 states and 156 transitions. [2021-11-25 20:40:03,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 20:40:03,331 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.625) internal successors, (105), 40 states have internal predecessors, (105), 13 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) Word has length 101 [2021-11-25 20:40:03,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:03,332 INFO L225 Difference]: With dead ends: 150 [2021-11-25 20:40:03,332 INFO L226 Difference]: Without dead ends: 111 [2021-11-25 20:40:03,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1228 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=671, Invalid=3235, Unknown=0, NotChecked=0, Total=3906 [2021-11-25 20:40:03,333 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 220 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:03,334 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [221 Valid, 167 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:40:03,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-25 20:40:03,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 98. [2021-11-25 20:40:03,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 72 states have (on average 1.0277777777777777) internal successors, (74), 72 states have internal predecessors, (74), 14 states have call successors, (14), 11 states have call predecessors, (14), 11 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 20:40:03,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 102 transitions. [2021-11-25 20:40:03,370 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 102 transitions. Word has length 101 [2021-11-25 20:40:03,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:03,372 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 102 transitions. [2021-11-25 20:40:03,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.625) internal successors, (105), 40 states have internal predecessors, (105), 13 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2021-11-25 20:40:03,372 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 102 transitions. [2021-11-25 20:40:03,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 20:40:03,373 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:03,374 INFO L514 BasicCegarLoop]: trace histogram [14, 12, 12, 12, 12, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:03,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:03,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:03,588 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:03,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:03,588 INFO L85 PathProgramCache]: Analyzing trace with hash 1109031971, now seen corresponding path program 30 times [2021-11-25 20:40:03,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:03,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709537643] [2021-11-25 20:40:03,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:03,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:03,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:04,389 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 377 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-25 20:40:04,389 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:04,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709537643] [2021-11-25 20:40:04,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709537643] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:04,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705310599] [2021-11-25 20:40:04,390 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:40:04,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:04,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:04,396 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:04,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 20:40:04,651 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:40:04,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:40:04,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-25 20:40:04,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:05,421 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 13 treesize of output 9 [2021-11-25 20:40:05,571 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:40:05,571 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 25 treesize of output 24 [2021-11-25 20:40:06,121 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 19 treesize of output 7 [2021-11-25 20:40:06,166 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 36 proven. 377 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-25 20:40:06,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:06,373 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 23 treesize of output 21 [2021-11-25 20:40:06,376 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 39 treesize of output 35 [2021-11-25 20:40:06,856 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 377 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-25 20:40:06,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705310599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:06,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1697515548] [2021-11-25 20:40:06,858 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:40:06,858 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:06,858 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:06,858 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:06,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:06,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:06,930 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:40:06,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:40:06,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:06,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:40:07,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:07,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:40:07,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:07,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:07,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:07,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:07,908 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:40:07,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:40:08,050 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 20 treesize of output 16 [2021-11-25 20:40:08,182 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:40:08,183 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:09,629 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21218#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:40:09,630 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:09,630 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:09,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 30] total 59 [2021-11-25 20:40:09,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999812283] [2021-11-25 20:40:09,630 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:09,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-25 20:40:09,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:09,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-25 20:40:09,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=4691, Unknown=0, NotChecked=0, Total=4970 [2021-11-25 20:40:09,632 INFO L87 Difference]: Start difference. First operand 98 states and 102 transitions. Second operand has 59 states, 57 states have (on average 2.210526315789474) internal successors, (126), 54 states have internal predecessors, (126), 26 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (28), 28 states have call predecessors, (28), 26 states have call successors, (28) [2021-11-25 20:40:11,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:11,030 INFO L93 Difference]: Finished difference Result 146 states and 152 transitions. [2021-11-25 20:40:11,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-25 20:40:11,031 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 57 states have (on average 2.210526315789474) internal successors, (126), 54 states have internal predecessors, (126), 26 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (28), 28 states have call predecessors, (28), 26 states have call successors, (28) Word has length 103 [2021-11-25 20:40:11,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:11,032 INFO L225 Difference]: With dead ends: 146 [2021-11-25 20:40:11,032 INFO L226 Difference]: Without dead ends: 144 [2021-11-25 20:40:11,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 264 SyntacticMatches, 6 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2315 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=403, Invalid=7079, Unknown=0, NotChecked=0, Total=7482 [2021-11-25 20:40:11,034 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 64 mSDsluCounter, 772 mSDsCounter, 0 mSdLazyCounter, 2135 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 765 SdHoareTripleChecker+Invalid, 2303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 2135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:11,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 765 Invalid, 2303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 2135 Invalid, 0 Unknown, 45 Unchecked, 1.0s Time] [2021-11-25 20:40:11,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-25 20:40:11,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 106. [2021-11-25 20:40:11,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 15 states have call successors, (15), 12 states have call predecessors, (15), 12 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 20:40:11,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 111 transitions. [2021-11-25 20:40:11,067 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 111 transitions. Word has length 103 [2021-11-25 20:40:11,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:11,067 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 111 transitions. [2021-11-25 20:40:11,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 57 states have (on average 2.210526315789474) internal successors, (126), 54 states have internal predecessors, (126), 26 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (28), 28 states have call predecessors, (28), 26 states have call successors, (28) [2021-11-25 20:40:11,068 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 111 transitions. [2021-11-25 20:40:11,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-25 20:40:11,069 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:11,069 INFO L514 BasicCegarLoop]: trace histogram [14, 12, 12, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:11,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:11,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:11,296 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:11,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:11,296 INFO L85 PathProgramCache]: Analyzing trace with hash -2006448635, now seen corresponding path program 31 times [2021-11-25 20:40:11,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:11,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689359552] [2021-11-25 20:40:11,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:11,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:11,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:12,226 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 13 proven. 408 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-25 20:40:12,226 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:12,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689359552] [2021-11-25 20:40:12,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689359552] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:12,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512503446] [2021-11-25 20:40:12,227 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:40:12,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:12,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:12,228 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:12,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 20:40:12,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:12,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-25 20:40:12,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:13,152 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 20:40:13,748 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 19 treesize of output 7 [2021-11-25 20:40:13,787 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 13 proven. 408 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-25 20:40:13,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:14,334 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 16 treesize of output 14 [2021-11-25 20:40:14,337 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 32 treesize of output 28 [2021-11-25 20:40:15,185 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 13 proven. 408 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-25 20:40:15,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [512503446] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:15,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2114158181] [2021-11-25 20:40:15,187 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:40:15,187 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:15,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:15,188 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:15,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:15,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:15,261 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:40:15,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:40:15,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:15,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:40:15,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:15,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:40:16,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:16,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:16,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:16,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:16,211 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:40:16,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:40:16,294 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 20 treesize of output 16 [2021-11-25 20:40:16,418 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:40:16,420 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:17,847 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22349#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:40:17,847 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:17,847 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:17,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 86 [2021-11-25 20:40:17,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419578068] [2021-11-25 20:40:17,848 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:17,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-25 20:40:17,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:17,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-25 20:40:17,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=9080, Unknown=0, NotChecked=0, Total=9506 [2021-11-25 20:40:17,849 INFO L87 Difference]: Start difference. First operand 106 states and 111 transitions. Second operand has 86 states, 84 states have (on average 2.238095238095238) internal successors, (188), 80 states have internal predecessors, (188), 38 states have call successors, (39), 1 states have call predecessors, (39), 2 states have return successors, (40), 40 states have call predecessors, (40), 38 states have call successors, (40) [2021-11-25 20:40:22,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:22,979 INFO L93 Difference]: Finished difference Result 160 states and 166 transitions. [2021-11-25 20:40:22,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-25 20:40:22,980 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 84 states have (on average 2.238095238095238) internal successors, (188), 80 states have internal predecessors, (188), 38 states have call successors, (39), 1 states have call predecessors, (39), 2 states have return successors, (40), 40 states have call predecessors, (40), 38 states have call successors, (40) Word has length 106 [2021-11-25 20:40:22,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:22,982 INFO L225 Difference]: With dead ends: 160 [2021-11-25 20:40:22,982 INFO L226 Difference]: Without dead ends: 158 [2021-11-25 20:40:22,984 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7047 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=1240, Invalid=21712, Unknown=0, NotChecked=0, Total=22952 [2021-11-25 20:40:22,985 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 239 mSDsluCounter, 1223 mSDsCounter, 0 mSdLazyCounter, 3509 mSolverCounterSat, 385 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 1224 SdHoareTripleChecker+Invalid, 3894 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 385 IncrementalHoareTripleChecker+Valid, 3509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:22,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 1224 Invalid, 3894 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [385 Valid, 3509 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 20:40:22,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-25 20:40:23,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 109. [2021-11-25 20:40:23,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 81 states have (on average 1.037037037037037) internal successors, (84), 81 states have internal predecessors, (84), 15 states have call successors, (15), 12 states have call predecessors, (15), 12 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 20:40:23,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 114 transitions. [2021-11-25 20:40:23,022 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 114 transitions. Word has length 106 [2021-11-25 20:40:23,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:23,022 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 114 transitions. [2021-11-25 20:40:23,023 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 84 states have (on average 2.238095238095238) internal successors, (188), 80 states have internal predecessors, (188), 38 states have call successors, (39), 1 states have call predecessors, (39), 2 states have return successors, (40), 40 states have call predecessors, (40), 38 states have call successors, (40) [2021-11-25 20:40:23,023 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 114 transitions. [2021-11-25 20:40:23,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-25 20:40:23,024 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:23,024 INFO L514 BasicCegarLoop]: trace histogram [15, 13, 13, 13, 13, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:23,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:23,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-25 20:40:23,244 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:23,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:23,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1590806724, now seen corresponding path program 32 times [2021-11-25 20:40:23,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:23,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840695687] [2021-11-25 20:40:23,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:23,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:23,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:23,953 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 12 proven. 416 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-25 20:40:23,953 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:23,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840695687] [2021-11-25 20:40:23,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1840695687] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:23,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595030148] [2021-11-25 20:40:23,954 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:40:23,954 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:23,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:23,955 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:23,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 20:40:24,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-25 20:40:24,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:40:24,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-25 20:40:24,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:25,455 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 20:40:25,559 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:40:25,560 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 25 treesize of output 24 [2021-11-25 20:40:25,711 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:40:25,711 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 25 treesize of output 24 [2021-11-25 20:40:26,258 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 19 treesize of output 7 [2021-11-25 20:40:26,302 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 63 proven. 413 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-25 20:40:26,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:26,554 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 20 treesize of output 18 [2021-11-25 20:40:26,557 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 36 treesize of output 32 [2021-11-25 20:40:26,956 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 12 proven. 416 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-25 20:40:26,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595030148] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:26,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1240748823] [2021-11-25 20:40:26,957 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:40:26,957 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:26,957 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:26,957 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:26,958 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:27,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:27,029 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:40:27,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:40:27,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:27,080 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:40:27,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:40:27,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:27,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:40:28,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:28,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:28,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:28,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:28,036 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:40:28,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:40:28,143 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 20 treesize of output 16 [2021-11-25 20:40:28,277 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:40:28,279 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:29,792 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23561#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:40:29,792 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:29,792 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:29,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 31] total 58 [2021-11-25 20:40:29,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875481880] [2021-11-25 20:40:29,793 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:29,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-25 20:40:29,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:29,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-25 20:40:29,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=4554, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 20:40:29,794 INFO L87 Difference]: Start difference. First operand 109 states and 114 transitions. Second operand has 58 states, 57 states have (on average 2.2280701754385963) internal successors, (127), 54 states have internal predecessors, (127), 26 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (29), 28 states have call predecessors, (29), 26 states have call successors, (29) [2021-11-25 20:40:31,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:31,005 INFO L93 Difference]: Finished difference Result 147 states and 151 transitions. [2021-11-25 20:40:31,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-25 20:40:31,006 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 2.2280701754385963) internal successors, (127), 54 states have internal predecessors, (127), 26 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (29), 28 states have call predecessors, (29), 26 states have call successors, (29) Word has length 108 [2021-11-25 20:40:31,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:31,008 INFO L225 Difference]: With dead ends: 147 [2021-11-25 20:40:31,008 INFO L226 Difference]: Without dead ends: 145 [2021-11-25 20:40:31,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 287 SyntacticMatches, 9 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=381, Invalid=6591, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 20:40:31,010 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 43 mSDsluCounter, 642 mSDsCounter, 0 mSdLazyCounter, 1813 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 627 SdHoareTripleChecker+Invalid, 1946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 1813 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:31,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 627 Invalid, 1946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 1813 Invalid, 0 Unknown, 88 Unchecked, 0.9s Time] [2021-11-25 20:40:31,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-25 20:40:31,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 111. [2021-11-25 20:40:31,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 15 states have call successors, (15), 13 states have call predecessors, (15), 13 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 20:40:31,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 115 transitions. [2021-11-25 20:40:31,048 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 115 transitions. Word has length 108 [2021-11-25 20:40:31,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:31,049 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 115 transitions. [2021-11-25 20:40:31,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 2.2280701754385963) internal successors, (127), 54 states have internal predecessors, (127), 26 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (29), 28 states have call predecessors, (29), 26 states have call successors, (29) [2021-11-25 20:40:31,050 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 115 transitions. [2021-11-25 20:40:31,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-25 20:40:31,051 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:31,051 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:31,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:31,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-25 20:40:31,268 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:31,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:31,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1045915421, now seen corresponding path program 33 times [2021-11-25 20:40:31,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:31,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128160925] [2021-11-25 20:40:31,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:31,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:31,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:31,656 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 188 proven. 244 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-25 20:40:31,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:31,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128160925] [2021-11-25 20:40:31,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128160925] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:31,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118630596] [2021-11-25 20:40:31,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:40:31,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:31,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:31,658 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:31,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-25 20:40:31,795 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:40:31,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:40:31,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 20:40:31,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:32,416 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 222 proven. 210 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-25 20:40:32,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:32,657 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 222 proven. 210 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-25 20:40:32,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118630596] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:32,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1522683454] [2021-11-25 20:40:32,658 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:40:32,658 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:32,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:32,658 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:32,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:32,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:32,741 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:40:32,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:40:32,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:32,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:40:32,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:32,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:40:33,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:33,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:33,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:33,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:33,708 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:40:33,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:40:33,774 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 20 treesize of output 16 [2021-11-25 20:40:33,923 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:40:33,924 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:34,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24682#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:40:34,969 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:34,970 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:34,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2021-11-25 20:40:34,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739793868] [2021-11-25 20:40:34,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:34,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 20:40:34,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:34,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 20:40:34,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=486, Invalid=2484, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 20:40:34,972 INFO L87 Difference]: Start difference. First operand 111 states and 115 transitions. Second operand has 43 states, 43 states have (on average 2.627906976744186) internal successors, (113), 43 states have internal predecessors, (113), 14 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2021-11-25 20:40:35,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:35,405 INFO L93 Difference]: Finished difference Result 163 states and 168 transitions. [2021-11-25 20:40:35,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 20:40:35,405 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.627906976744186) internal successors, (113), 43 states have internal predecessors, (113), 14 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) Word has length 109 [2021-11-25 20:40:35,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:35,407 INFO L225 Difference]: With dead ends: 163 [2021-11-25 20:40:35,407 INFO L226 Difference]: Without dead ends: 121 [2021-11-25 20:40:35,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 300 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1380 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=768, Invalid=3654, Unknown=0, NotChecked=0, Total=4422 [2021-11-25 20:40:35,409 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 111 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 368 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 368 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:35,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 202 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 368 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:40:35,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-25 20:40:35,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 108. [2021-11-25 20:40:35,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 15 states have call successors, (15), 13 states have call predecessors, (15), 13 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 20:40:35,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 111 transitions. [2021-11-25 20:40:35,442 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 111 transitions. Word has length 109 [2021-11-25 20:40:35,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:35,443 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 111 transitions. [2021-11-25 20:40:35,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.627906976744186) internal successors, (113), 43 states have internal predecessors, (113), 14 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2021-11-25 20:40:35,443 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 111 transitions. [2021-11-25 20:40:35,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-25 20:40:35,443 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:35,444 INFO L514 BasicCegarLoop]: trace histogram [15, 13, 13, 13, 13, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:35,469 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-25 20:40:35,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-25 20:40:35,644 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:35,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:35,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1059482052, now seen corresponding path program 34 times [2021-11-25 20:40:35,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:35,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536098881] [2021-11-25 20:40:35,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:35,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:35,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:36,780 INFO L134 CoverageAnalysis]: Checked inductivity of 644 backedges. 13 proven. 447 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-25 20:40:36,781 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:36,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536098881] [2021-11-25 20:40:36,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536098881] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:36,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799905351] [2021-11-25 20:40:36,781 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:40:36,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:36,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:36,783 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:36,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-25 20:40:37,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:37,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-25 20:40:37,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:37,786 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 20:40:37,919 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:40:37,919 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 25 treesize of output 24 [2021-11-25 20:40:38,539 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 19 treesize of output 7 [2021-11-25 20:40:38,580 INFO L134 CoverageAnalysis]: Checked inductivity of 644 backedges. 39 proven. 447 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-25 20:40:38,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:39,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [799905351] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:39,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1543359331] [2021-11-25 20:40:39,238 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:40:39,238 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:39,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:39,239 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:39,239 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:39,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:39,307 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:40:39,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:40:39,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:39,353 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:40:39,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:40:39,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:39,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:40:40,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:40,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:40,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:40,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:40,346 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:40:40,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:40:40,414 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 20 treesize of output 16 [2021-11-25 20:40:40,574 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:40:40,576 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:41,985 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25637#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:40:41,985 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:41,986 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:40:41,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 63 [2021-11-25 20:40:41,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208437747] [2021-11-25 20:40:41,986 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:41,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-25 20:40:41,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:41,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-25 20:40:41,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=7247, Unknown=0, NotChecked=0, Total=7656 [2021-11-25 20:40:41,988 INFO L87 Difference]: Start difference. First operand 108 states and 111 transitions. Second operand has 63 states, 61 states have (on average 2.180327868852459) internal successors, (133), 59 states have internal predecessors, (133), 28 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (29), 29 states have call predecessors, (29), 28 states have call successors, (29) [2021-11-25 20:40:44,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:44,920 INFO L93 Difference]: Finished difference Result 116 states and 120 transitions. [2021-11-25 20:40:44,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-25 20:40:44,921 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 61 states have (on average 2.180327868852459) internal successors, (133), 59 states have internal predecessors, (133), 28 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (29), 29 states have call predecessors, (29), 28 states have call successors, (29) Word has length 111 [2021-11-25 20:40:44,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:44,922 INFO L225 Difference]: With dead ends: 116 [2021-11-25 20:40:44,922 INFO L226 Difference]: Without dead ends: 114 [2021-11-25 20:40:44,924 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 206 SyntacticMatches, 3 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5191 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=726, Invalid=13554, Unknown=0, NotChecked=0, Total=14280 [2021-11-25 20:40:44,924 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 97 mSDsluCounter, 1255 mSDsCounter, 0 mSdLazyCounter, 3334 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 1218 SdHoareTripleChecker+Invalid, 3593 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 3334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 74 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:44,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 1218 Invalid, 3593 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 3334 Invalid, 0 Unknown, 74 Unchecked, 1.6s Time] [2021-11-25 20:40:44,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-25 20:40:44,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 111. [2021-11-25 20:40:44,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 15 states have call successors, (15), 13 states have call predecessors, (15), 13 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 20:40:44,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2021-11-25 20:40:44,974 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 111 [2021-11-25 20:40:44,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:44,975 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2021-11-25 20:40:44,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 61 states have (on average 2.180327868852459) internal successors, (133), 59 states have internal predecessors, (133), 28 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (29), 29 states have call predecessors, (29), 28 states have call successors, (29) [2021-11-25 20:40:44,975 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2021-11-25 20:40:44,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-25 20:40:44,976 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:44,977 INFO L514 BasicCegarLoop]: trace histogram [15, 13, 13, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:45,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:45,191 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-25 20:40:45,192 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:45,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:45,192 INFO L85 PathProgramCache]: Analyzing trace with hash -679335740, now seen corresponding path program 35 times [2021-11-25 20:40:45,192 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:45,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997673830] [2021-11-25 20:40:45,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:45,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:45,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:45,932 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 14 proven. 481 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-25 20:40:45,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:45,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997673830] [2021-11-25 20:40:45,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997673830] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:45,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429390356] [2021-11-25 20:40:45,932 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:40:45,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:45,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:45,933 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:45,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 20:40:46,666 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-25 20:40:46,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:40:46,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-25 20:40:46,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:47,648 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 15 treesize of output 11 [2021-11-25 20:40:48,927 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-25 20:40:48,927 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 25 treesize of output 12 [2021-11-25 20:40:48,992 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 224 proven. 271 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-25 20:40:48,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:50,512 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 20 treesize of output 18 [2021-11-25 20:40:50,516 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 42 treesize of output 36 [2021-11-25 20:40:51,895 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 212 proven. 283 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-25 20:40:51,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1429390356] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:51,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [698292461] [2021-11-25 20:40:51,896 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:40:51,896 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:51,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:51,897 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:51,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:51,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:51,969 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:40:51,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:40:51,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:51,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:40:52,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:52,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:40:53,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:53,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:53,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:53,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:53,048 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:40:53,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:40:53,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-25 20:40:53,263 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:40:53,289 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:54,811 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26822#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:40:54,811 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:54,811 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:54,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 91 [2021-11-25 20:40:54,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11065270] [2021-11-25 20:40:54,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:54,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-25 20:40:54,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:54,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-25 20:40:54,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=951, Invalid=9555, Unknown=0, NotChecked=0, Total=10506 [2021-11-25 20:40:54,813 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand has 91 states, 90 states have (on average 2.2444444444444445) internal successors, (202), 86 states have internal predecessors, (202), 40 states have call successors, (41), 1 states have call predecessors, (41), 2 states have return successors, (42), 42 states have call predecessors, (42), 40 states have call successors, (42) [2021-11-25 20:40:58,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:58,233 INFO L93 Difference]: Finished difference Result 156 states and 161 transitions. [2021-11-25 20:40:58,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-25 20:40:58,233 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 90 states have (on average 2.2444444444444445) internal successors, (202), 86 states have internal predecessors, (202), 40 states have call successors, (41), 1 states have call predecessors, (41), 2 states have return successors, (42), 42 states have call predecessors, (42), 40 states have call successors, (42) Word has length 114 [2021-11-25 20:40:58,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:58,234 INFO L225 Difference]: With dead ends: 156 [2021-11-25 20:40:58,234 INFO L226 Difference]: Without dead ends: 114 [2021-11-25 20:40:58,237 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 285 SyntacticMatches, 1 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7190 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=2084, Invalid=22096, Unknown=0, NotChecked=0, Total=24180 [2021-11-25 20:40:58,237 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 6 mSDsluCounter, 974 mSDsCounter, 0 mSdLazyCounter, 952 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 973 SdHoareTripleChecker+Invalid, 1206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 952 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 183 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:58,238 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 973 Invalid, 1206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 952 Invalid, 0 Unknown, 183 Unchecked, 0.5s Time] [2021-11-25 20:40:58,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-25 20:40:58,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2021-11-25 20:40:58,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 84 states have (on average 1.0238095238095237) internal successors, (86), 84 states have internal predecessors, (86), 16 states have call successors, (16), 13 states have call predecessors, (16), 13 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-25 20:40:58,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 118 transitions. [2021-11-25 20:40:58,275 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 118 transitions. Word has length 114 [2021-11-25 20:40:58,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:58,276 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 118 transitions. [2021-11-25 20:40:58,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 90 states have (on average 2.2444444444444445) internal successors, (202), 86 states have internal predecessors, (202), 40 states have call successors, (41), 1 states have call predecessors, (41), 2 states have return successors, (42), 42 states have call predecessors, (42), 40 states have call successors, (42) [2021-11-25 20:40:58,276 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 118 transitions. [2021-11-25 20:40:58,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-25 20:40:58,277 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:58,278 INFO L514 BasicCegarLoop]: trace histogram [16, 14, 14, 14, 14, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:58,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:58,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-25 20:40:58,504 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:58,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:58,504 INFO L85 PathProgramCache]: Analyzing trace with hash 104619395, now seen corresponding path program 36 times [2021-11-25 20:40:58,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:58,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637026075] [2021-11-25 20:40:58,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:58,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:58,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:59,463 INFO L134 CoverageAnalysis]: Checked inductivity of 749 backedges. 14 proven. 523 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-25 20:40:59,464 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:59,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637026075] [2021-11-25 20:40:59,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637026075] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:59,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791877257] [2021-11-25 20:40:59,464 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:40:59,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:59,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:59,466 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:59,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-25 20:40:59,764 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:40:59,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:40:59,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-25 20:40:59,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:41:00,783 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 20:41:00,946 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:41:00,946 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 25 treesize of output 24 [2021-11-25 20:41:01,672 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 19 treesize of output 7 [2021-11-25 20:41:01,724 INFO L134 CoverageAnalysis]: Checked inductivity of 749 backedges. 42 proven. 523 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-25 20:41:01,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:41:01,958 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 23 treesize of output 21 [2021-11-25 20:41:01,961 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 39 treesize of output 35 [2021-11-25 20:41:02,482 INFO L134 CoverageAnalysis]: Checked inductivity of 749 backedges. 14 proven. 523 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-25 20:41:02,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [791877257] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:41:02,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [774789116] [2021-11-25 20:41:02,484 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:41:02,484 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:41:02,484 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:41:02,485 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:41:02,485 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:41:02,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:02,562 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:41:02,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:41:02,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:02,598 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:41:02,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:41:02,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:02,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:41:03,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:03,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:03,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:03,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:03,538 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:41:03,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:41:03,647 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 20 treesize of output 16 [2021-11-25 20:41:03,779 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:41:03,781 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:41:05,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28126#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:41:05,411 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:41:05,411 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:41:05,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 34] total 67 [2021-11-25 20:41:05,411 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601856154] [2021-11-25 20:41:05,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:41:05,412 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-25 20:41:05,412 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:05,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-25 20:41:05,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=5851, Unknown=0, NotChecked=0, Total=6162 [2021-11-25 20:41:05,413 INFO L87 Difference]: Start difference. First operand 114 states and 118 transitions. Second operand has 67 states, 65 states have (on average 2.246153846153846) internal successors, (146), 62 states have internal predecessors, (146), 30 states have call successors, (31), 2 states have call predecessors, (31), 3 states have return successors, (32), 32 states have call predecessors, (32), 30 states have call successors, (32) [2021-11-25 20:41:07,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:07,164 INFO L93 Difference]: Finished difference Result 124 states and 128 transitions. [2021-11-25 20:41:07,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-25 20:41:07,164 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 65 states have (on average 2.246153846153846) internal successors, (146), 62 states have internal predecessors, (146), 30 states have call successors, (31), 2 states have call predecessors, (31), 3 states have return successors, (32), 32 states have call predecessors, (32), 30 states have call successors, (32) Word has length 119 [2021-11-25 20:41:07,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:07,165 INFO L225 Difference]: With dead ends: 124 [2021-11-25 20:41:07,166 INFO L226 Difference]: Without dead ends: 122 [2021-11-25 20:41:07,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 309 SyntacticMatches, 6 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2750 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=432, Invalid=8498, Unknown=0, NotChecked=0, Total=8930 [2021-11-25 20:41:07,167 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 50 mSDsluCounter, 1013 mSDsCounter, 0 mSdLazyCounter, 2862 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 979 SdHoareTripleChecker+Invalid, 3053 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 2862 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 85 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:07,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 979 Invalid, 3053 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 2862 Invalid, 0 Unknown, 85 Unchecked, 1.4s Time] [2021-11-25 20:41:07,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-25 20:41:07,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 119. [2021-11-25 20:41:07,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 88 states have (on average 1.0227272727272727) internal successors, (90), 88 states have internal predecessors, (90), 16 states have call successors, (16), 14 states have call predecessors, (16), 14 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-25 20:41:07,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 122 transitions. [2021-11-25 20:41:07,210 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 122 transitions. Word has length 119 [2021-11-25 20:41:07,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:07,210 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 122 transitions. [2021-11-25 20:41:07,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 65 states have (on average 2.246153846153846) internal successors, (146), 62 states have internal predecessors, (146), 30 states have call successors, (31), 2 states have call predecessors, (31), 3 states have return successors, (32), 32 states have call predecessors, (32), 30 states have call successors, (32) [2021-11-25 20:41:07,211 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 122 transitions. [2021-11-25 20:41:07,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-25 20:41:07,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:07,212 INFO L514 BasicCegarLoop]: trace histogram [16, 14, 14, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:41:07,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-25 20:41:07,435 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-25 20:41:07,436 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:41:07,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:07,436 INFO L85 PathProgramCache]: Analyzing trace with hash -1424349019, now seen corresponding path program 37 times [2021-11-25 20:41:07,436 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:07,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279293074] [2021-11-25 20:41:07,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:07,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:07,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:08,429 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 15 proven. 560 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-25 20:41:08,429 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:08,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279293074] [2021-11-25 20:41:08,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279293074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:41:08,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658738910] [2021-11-25 20:41:08,429 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:41:08,430 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:08,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:41:08,431 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:41:08,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-25 20:41:08,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:08,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-25 20:41:08,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:41:09,862 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 20:41:10,644 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 19 treesize of output 7 [2021-11-25 20:41:10,695 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 15 proven. 560 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-25 20:41:10,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:41:10,891 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 16 treesize of output 14 [2021-11-25 20:41:10,894 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 32 treesize of output 28 [2021-11-25 20:41:11,356 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 15 proven. 560 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-25 20:41:11,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658738910] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:41:11,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2083442557] [2021-11-25 20:41:11,357 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:41:11,357 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:41:11,358 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:41:11,358 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:41:11,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:41:11,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:11,432 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:41:11,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:41:11,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:11,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:41:11,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:11,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:41:12,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:12,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:12,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:12,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:12,374 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:41:12,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:41:12,466 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 20 treesize of output 16 [2021-11-25 20:41:12,592 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:41:12,593 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:41:14,046 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29326#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:41:14,046 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:41:14,046 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:41:14,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 66 [2021-11-25 20:41:14,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176120069] [2021-11-25 20:41:14,047 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:41:14,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-25 20:41:14,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:14,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-25 20:41:14,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=5731, Unknown=0, NotChecked=0, Total=6006 [2021-11-25 20:41:14,050 INFO L87 Difference]: Start difference. First operand 119 states and 122 transitions. Second operand has 66 states, 65 states have (on average 2.292307692307692) internal successors, (149), 62 states have internal predecessors, (149), 29 states have call successors, (30), 1 states have call predecessors, (30), 2 states have return successors, (31), 31 states have call predecessors, (31), 29 states have call successors, (31) [2021-11-25 20:41:17,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:17,240 INFO L93 Difference]: Finished difference Result 180 states and 186 transitions. [2021-11-25 20:41:17,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-25 20:41:17,240 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 2.292307692307692) internal successors, (149), 62 states have internal predecessors, (149), 29 states have call successors, (30), 1 states have call predecessors, (30), 2 states have return successors, (31), 31 states have call predecessors, (31), 29 states have call successors, (31) Word has length 122 [2021-11-25 20:41:17,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:17,242 INFO L225 Difference]: With dead ends: 180 [2021-11-25 20:41:17,242 INFO L226 Difference]: Without dead ends: 178 [2021-11-25 20:41:17,244 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 320 SyntacticMatches, 4 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4282 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=771, Invalid=14481, Unknown=0, NotChecked=0, Total=15252 [2021-11-25 20:41:17,245 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 127 mSDsluCounter, 1317 mSDsCounter, 0 mSdLazyCounter, 3622 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 1314 SdHoareTripleChecker+Invalid, 3866 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 3622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:17,245 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 1314 Invalid, 3866 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 3622 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 20:41:17,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-25 20:41:17,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 125. [2021-11-25 20:41:17,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 93 states have (on average 1.032258064516129) internal successors, (96), 93 states have internal predecessors, (96), 17 states have call successors, (17), 14 states have call predecessors, (17), 14 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-25 20:41:17,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 130 transitions. [2021-11-25 20:41:17,292 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 130 transitions. Word has length 122 [2021-11-25 20:41:17,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:17,292 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 130 transitions. [2021-11-25 20:41:17,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 65 states have (on average 2.292307692307692) internal successors, (149), 62 states have internal predecessors, (149), 29 states have call successors, (30), 1 states have call predecessors, (30), 2 states have return successors, (31), 31 states have call predecessors, (31), 29 states have call successors, (31) [2021-11-25 20:41:17,293 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 130 transitions. [2021-11-25 20:41:17,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 20:41:17,294 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:17,294 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:41:17,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-25 20:41:17,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:17,507 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:41:17,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:17,508 INFO L85 PathProgramCache]: Analyzing trace with hash 1500770883, now seen corresponding path program 38 times [2021-11-25 20:41:17,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:17,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496004501] [2021-11-25 20:41:17,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:17,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:17,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:18,016 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 261 proven. 327 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-25 20:41:18,017 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:18,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496004501] [2021-11-25 20:41:18,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496004501] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:41:18,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413202599] [2021-11-25 20:41:18,017 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:41:18,017 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:18,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:41:18,020 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:41:18,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 20:41:19,024 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-25 20:41:19,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:41:19,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 20:41:19,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:41:19,790 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 301 proven. 287 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-25 20:41:19,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:41:20,068 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 301 proven. 287 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-25 20:41:20,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1413202599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:41:20,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [742514443] [2021-11-25 20:41:20,070 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:41:20,070 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:41:20,070 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:41:20,070 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:41:20,071 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:41:20,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:20,140 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:41:20,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:41:20,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:20,177 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:41:20,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:41:20,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:20,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:41:21,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:21,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:21,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:21,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:21,148 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:41:21,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:41:21,228 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 20 treesize of output 16 [2021-11-25 20:41:21,370 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:41:21,371 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:41:22,493 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30669#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:41:22,494 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:41:22,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:41:22,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2021-11-25 20:41:22,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99510193] [2021-11-25 20:41:22,494 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:41:22,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-25 20:41:22,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:22,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-25 20:41:22,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=612, Invalid=3048, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:41:22,496 INFO L87 Difference]: Start difference. First operand 125 states and 130 transitions. Second operand has 49 states, 49 states have (on average 2.63265306122449) internal successors, (129), 49 states have internal predecessors, (129), 16 states have call successors, (17), 1 states have call predecessors, (17), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-25 20:41:22,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:22,959 INFO L93 Difference]: Finished difference Result 183 states and 189 transitions. [2021-11-25 20:41:22,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-25 20:41:22,960 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.63265306122449) internal successors, (129), 49 states have internal predecessors, (129), 16 states have call successors, (17), 1 states have call predecessors, (17), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) Word has length 125 [2021-11-25 20:41:22,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:22,961 INFO L225 Difference]: With dead ends: 183 [2021-11-25 20:41:22,961 INFO L226 Difference]: Without dead ends: 135 [2021-11-25 20:41:22,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 346 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1708 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=983, Invalid=4567, Unknown=0, NotChecked=0, Total=5550 [2021-11-25 20:41:22,962 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 141 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:22,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 189 Invalid, 451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:41:22,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-25 20:41:22,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 122. [2021-11-25 20:41:22,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 states have internal predecessors, (92), 17 states have call successors, (17), 14 states have call predecessors, (17), 14 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-25 20:41:22,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2021-11-25 20:41:22,990 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 125 [2021-11-25 20:41:22,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:22,991 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2021-11-25 20:41:22,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.63265306122449) internal successors, (129), 49 states have internal predecessors, (129), 16 states have call successors, (17), 1 states have call predecessors, (17), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-25 20:41:22,991 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2021-11-25 20:41:22,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 20:41:22,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:22,992 INFO L514 BasicCegarLoop]: trace histogram [17, 15, 15, 15, 15, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:41:23,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-25 20:41:23,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-25 20:41:23,193 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:41:23,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:23,193 INFO L85 PathProgramCache]: Analyzing trace with hash 91172452, now seen corresponding path program 39 times [2021-11-25 20:41:23,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:23,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355954563] [2021-11-25 20:41:23,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:23,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:23,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:24,092 INFO L134 CoverageAnalysis]: Checked inductivity of 862 backedges. 15 proven. 605 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-25 20:41:24,092 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:24,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355954563] [2021-11-25 20:41:24,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355954563] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:41:24,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2055836020] [2021-11-25 20:41:24,092 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:41:24,092 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:24,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:41:24,093 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:41:24,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-25 20:41:24,404 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:41:24,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:41:24,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-25 20:41:24,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:41:25,483 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 20:41:25,654 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:41:25,654 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 25 treesize of output 24 [2021-11-25 20:41:26,460 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 19 treesize of output 7 [2021-11-25 20:41:26,513 INFO L134 CoverageAnalysis]: Checked inductivity of 862 backedges. 45 proven. 605 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-25 20:41:26,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:41:26,761 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 23 treesize of output 21 [2021-11-25 20:41:26,764 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 39 treesize of output 35 [2021-11-25 20:41:27,343 INFO L134 CoverageAnalysis]: Checked inductivity of 862 backedges. 15 proven. 605 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-25 20:41:27,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2055836020] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:41:27,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2053089124] [2021-11-25 20:41:27,344 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:41:27,344 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:41:27,345 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:41:27,345 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:41:27,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:41:27,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:27,420 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:41:27,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:41:27,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:27,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:41:27,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:27,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:41:28,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:28,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:28,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:28,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:28,369 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:41:28,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:41:28,443 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 20 treesize of output 16 [2021-11-25 20:41:28,584 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:41:28,585 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:41:30,093 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31982#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:41:30,093 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:41:30,094 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:41:30,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 36] total 71 [2021-11-25 20:41:30,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995649836] [2021-11-25 20:41:30,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:41:30,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-25 20:41:30,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:30,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-25 20:41:30,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=6479, Unknown=0, NotChecked=0, Total=6806 [2021-11-25 20:41:30,096 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand has 71 states, 69 states have (on average 2.260869565217391) internal successors, (156), 66 states have internal predecessors, (156), 32 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (34), 34 states have call predecessors, (34), 32 states have call successors, (34) [2021-11-25 20:41:32,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:32,118 INFO L93 Difference]: Finished difference Result 173 states and 179 transitions. [2021-11-25 20:41:32,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-25 20:41:32,119 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 69 states have (on average 2.260869565217391) internal successors, (156), 66 states have internal predecessors, (156), 32 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (34), 34 states have call predecessors, (34), 32 states have call successors, (34) Word has length 127 [2021-11-25 20:41:32,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:32,121 INFO L225 Difference]: With dead ends: 173 [2021-11-25 20:41:32,121 INFO L226 Difference]: Without dead ends: 171 [2021-11-25 20:41:32,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 344 SyntacticMatches, 6 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3043 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=459, Invalid=9441, Unknown=0, NotChecked=0, Total=9900 [2021-11-25 20:41:32,125 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 72 mSDsluCounter, 1324 mSDsCounter, 0 mSdLazyCounter, 3053 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 1286 SdHoareTripleChecker+Invalid, 3256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 3053 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 116 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:32,126 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 1286 Invalid, 3256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 3053 Invalid, 0 Unknown, 116 Unchecked, 1.5s Time] [2021-11-25 20:41:32,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-25 20:41:32,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 130. [2021-11-25 20:41:32,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 18 states have call successors, (18), 15 states have call predecessors, (18), 15 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 20:41:32,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 135 transitions. [2021-11-25 20:41:32,200 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 135 transitions. Word has length 127 [2021-11-25 20:41:32,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:32,203 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 135 transitions. [2021-11-25 20:41:32,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 69 states have (on average 2.260869565217391) internal successors, (156), 66 states have internal predecessors, (156), 32 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (34), 34 states have call predecessors, (34), 32 states have call successors, (34) [2021-11-25 20:41:32,204 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 135 transitions. [2021-11-25 20:41:32,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-25 20:41:32,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:32,206 INFO L514 BasicCegarLoop]: trace histogram [17, 15, 15, 15, 15, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:41:32,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-25 20:41:32,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-25 20:41:32,419 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:41:32,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:32,420 INFO L85 PathProgramCache]: Analyzing trace with hash 1704697892, now seen corresponding path program 40 times [2021-11-25 20:41:32,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:32,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144671281] [2021-11-25 20:41:32,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:32,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:32,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:33,508 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 16 proven. 645 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-25 20:41:33,508 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:33,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144671281] [2021-11-25 20:41:33,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144671281] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:41:33,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221416928] [2021-11-25 20:41:33,509 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:41:33,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:33,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:41:33,511 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:41:33,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-25 20:41:33,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:33,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-25 20:41:33,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:41:34,946 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 20:41:35,826 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 19 treesize of output 7 [2021-11-25 20:41:35,878 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 16 proven. 645 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-25 20:41:35,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:41:36,111 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 16 treesize of output 14 [2021-11-25 20:41:36,113 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 32 treesize of output 28 [2021-11-25 20:41:36,590 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 16 proven. 645 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-25 20:41:36,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221416928] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:41:36,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2008956004] [2021-11-25 20:41:36,592 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:41:36,592 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:41:36,592 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:41:36,593 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:41:36,593 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:41:36,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:36,668 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:41:36,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:41:36,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:36,703 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:41:36,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:41:36,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:36,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:41:37,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:37,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:37,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:37,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:37,650 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:41:37,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:41:37,773 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 20 treesize of output 16 [2021-11-25 20:41:37,952 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:41:37,955 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:41:39,717 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33334#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:41:39,718 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:41:39,718 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:41:39,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 70 [2021-11-25 20:41:39,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883371346] [2021-11-25 20:41:39,718 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:41:39,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-25 20:41:39,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:39,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-25 20:41:39,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=6353, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 20:41:39,721 INFO L87 Difference]: Start difference. First operand 130 states and 135 transitions. Second operand has 70 states, 69 states have (on average 2.3043478260869565) internal successors, (159), 66 states have internal predecessors, (159), 31 states have call successors, (32), 1 states have call predecessors, (32), 2 states have return successors, (33), 33 states have call predecessors, (33), 31 states have call successors, (33) [2021-11-25 20:41:43,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:43,248 INFO L93 Difference]: Finished difference Result 193 states and 199 transitions. [2021-11-25 20:41:43,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-25 20:41:43,248 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 2.3043478260869565) internal successors, (159), 66 states have internal predecessors, (159), 31 states have call successors, (32), 1 states have call predecessors, (32), 2 states have return successors, (33), 33 states have call predecessors, (33), 31 states have call successors, (33) Word has length 130 [2021-11-25 20:41:43,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:43,251 INFO L225 Difference]: With dead ends: 193 [2021-11-25 20:41:43,251 INFO L226 Difference]: Without dead ends: 191 [2021-11-25 20:41:43,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 342 SyntacticMatches, 4 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4795 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=818, Invalid=16212, Unknown=0, NotChecked=0, Total=17030 [2021-11-25 20:41:43,254 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 170 mSDsluCounter, 1500 mSDsCounter, 0 mSdLazyCounter, 3951 mSolverCounterSat, 303 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 1505 SdHoareTripleChecker+Invalid, 4254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 303 IncrementalHoareTripleChecker+Valid, 3951 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:43,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [172 Valid, 1505 Invalid, 4254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [303 Valid, 3951 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-25 20:41:43,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-25 20:41:43,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 133. [2021-11-25 20:41:43,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 99 states have (on average 1.0303030303030303) internal successors, (102), 99 states have internal predecessors, (102), 18 states have call successors, (18), 15 states have call predecessors, (18), 15 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 20:41:43,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 138 transitions. [2021-11-25 20:41:43,293 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 138 transitions. Word has length 130 [2021-11-25 20:41:43,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:43,293 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 138 transitions. [2021-11-25 20:41:43,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 69 states have (on average 2.3043478260869565) internal successors, (159), 66 states have internal predecessors, (159), 31 states have call successors, (32), 1 states have call predecessors, (32), 2 states have return successors, (33), 33 states have call predecessors, (33), 31 states have call successors, (33) [2021-11-25 20:41:43,294 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 138 transitions. [2021-11-25 20:41:43,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-25 20:41:43,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:43,295 INFO L514 BasicCegarLoop]: trace histogram [18, 16, 16, 16, 16, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:41:43,334 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-25 20:41:43,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:43,513 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:41:43,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:43,514 INFO L85 PathProgramCache]: Analyzing trace with hash -1503467515, now seen corresponding path program 41 times [2021-11-25 20:41:43,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:43,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25756446] [2021-11-25 20:41:43,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:43,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:43,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:44,553 INFO L134 CoverageAnalysis]: Checked inductivity of 942 backedges. 15 proven. 653 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-25 20:41:44,553 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:44,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25756446] [2021-11-25 20:41:44,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25756446] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:41:44,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631635198] [2021-11-25 20:41:44,554 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:41:44,554 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:44,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:41:44,555 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:41:44,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-25 20:41:45,535 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-25 20:41:45,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:41:45,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-25 20:41:45,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:41:46,606 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 20:41:46,722 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:41:46,722 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 25 treesize of output 24 [2021-11-25 20:41:46,897 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:41:46,897 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 25 treesize of output 24 [2021-11-25 20:41:47,689 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 19 treesize of output 7 [2021-11-25 20:41:47,741 INFO L134 CoverageAnalysis]: Checked inductivity of 942 backedges. 78 proven. 650 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-25 20:41:47,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:41:48,041 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 20 treesize of output 18 [2021-11-25 20:41:48,044 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 36 treesize of output 32 [2021-11-25 20:41:48,536 INFO L134 CoverageAnalysis]: Checked inductivity of 942 backedges. 15 proven. 653 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-25 20:41:48,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631635198] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:41:48,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2012929217] [2021-11-25 20:41:48,537 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:41:48,537 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:41:48,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:41:48,538 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:41:48,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:41:48,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:48,616 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:41:48,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:41:48,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:48,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:41:48,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:48,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:41:49,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:49,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:49,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:49,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:49,569 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:41:49,570 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:41:49,635 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 20 treesize of output 16 [2021-11-25 20:41:49,762 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:41:49,764 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:41:51,250 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34776#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:41:51,250 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:41:51,250 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:41:51,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 38, 37] total 70 [2021-11-25 20:41:51,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179647044] [2021-11-25 20:41:51,251 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:41:51,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-25 20:41:51,252 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:51,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-25 20:41:51,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=6318, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 20:41:51,253 INFO L87 Difference]: Start difference. First operand 133 states and 138 transitions. Second operand has 70 states, 69 states have (on average 2.2753623188405796) internal successors, (157), 66 states have internal predecessors, (157), 32 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (35), 34 states have call predecessors, (35), 32 states have call successors, (35) [2021-11-25 20:41:53,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:53,004 INFO L93 Difference]: Finished difference Result 180 states and 184 transitions. [2021-11-25 20:41:53,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-25 20:41:53,005 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 2.2753623188405796) internal successors, (157), 66 states have internal predecessors, (157), 32 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (35), 34 states have call predecessors, (35), 32 states have call successors, (35) Word has length 132 [2021-11-25 20:41:53,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:53,006 INFO L225 Difference]: With dead ends: 180 [2021-11-25 20:41:53,006 INFO L226 Difference]: Without dead ends: 178 [2021-11-25 20:41:53,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 356 SyntacticMatches, 9 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3116 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=453, Invalid=9249, Unknown=0, NotChecked=0, Total=9702 [2021-11-25 20:41:53,007 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 82 mSDsluCounter, 785 mSDsCounter, 0 mSdLazyCounter, 2748 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 798 SdHoareTripleChecker+Invalid, 2914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 2748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:53,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 798 Invalid, 2914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 2748 Invalid, 0 Unknown, 81 Unchecked, 1.3s Time] [2021-11-25 20:41:53,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-25 20:41:53,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 135. [2021-11-25 20:41:53,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 18 states have call successors, (18), 16 states have call predecessors, (18), 16 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 20:41:53,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 139 transitions. [2021-11-25 20:41:53,063 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 139 transitions. Word has length 132 [2021-11-25 20:41:53,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:53,064 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 139 transitions. [2021-11-25 20:41:53,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 69 states have (on average 2.2753623188405796) internal successors, (157), 66 states have internal predecessors, (157), 32 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (35), 34 states have call predecessors, (35), 32 states have call successors, (35) [2021-11-25 20:41:53,065 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 139 transitions. [2021-11-25 20:41:53,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-25 20:41:53,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:53,066 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:41:53,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-25 20:41:53,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:53,288 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:41:53,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:53,288 INFO L85 PathProgramCache]: Analyzing trace with hash 967104100, now seen corresponding path program 42 times [2021-11-25 20:41:53,288 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:53,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869581050] [2021-11-25 20:41:53,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:53,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:53,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:53,776 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 302 proven. 373 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-11-25 20:41:53,776 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:53,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869581050] [2021-11-25 20:41:53,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869581050] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:41:53,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024704753] [2021-11-25 20:41:53,777 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:41:53,777 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:53,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:41:53,778 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:41:53,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-25 20:41:53,951 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:41:53,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:41:53,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 20:41:53,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:41:54,791 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 345 proven. 330 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-11-25 20:41:54,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:41:55,086 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 345 proven. 330 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-11-25 20:41:55,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024704753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:41:55,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1097329106] [2021-11-25 20:41:55,088 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:41:55,088 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:41:55,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:41:55,089 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:41:55,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:41:55,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:55,175 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:41:55,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:41:55,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:55,210 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:41:55,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:41:55,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:55,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:41:56,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:56,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:56,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:56,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:56,157 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:41:56,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:41:56,233 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 20 treesize of output 16 [2021-11-25 20:41:56,377 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:41:56,379 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:41:57,527 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36143#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:41:57,527 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:41:57,527 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:41:57,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2021-11-25 20:41:57,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660541896] [2021-11-25 20:41:57,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:41:57,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-25 20:41:57,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:57,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-25 20:41:57,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=3351, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 20:41:57,529 INFO L87 Difference]: Start difference. First operand 135 states and 139 transitions. Second operand has 52 states, 52 states have (on average 2.6346153846153846) internal successors, (137), 52 states have internal predecessors, (137), 17 states have call successors, (18), 1 states have call predecessors, (18), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) [2021-11-25 20:41:58,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:58,097 INFO L93 Difference]: Finished difference Result 196 states and 201 transitions. [2021-11-25 20:41:58,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 20:41:58,097 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.6346153846153846) internal successors, (137), 52 states have internal predecessors, (137), 17 states have call successors, (18), 1 states have call predecessors, (18), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) Word has length 133 [2021-11-25 20:41:58,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:58,099 INFO L225 Difference]: With dead ends: 196 [2021-11-25 20:41:58,099 INFO L226 Difference]: Without dead ends: 145 [2021-11-25 20:41:58,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1884 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1101, Invalid=5061, Unknown=0, NotChecked=0, Total=6162 [2021-11-25 20:41:58,101 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 210 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:58,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 204 Invalid, 543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:41:58,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-25 20:41:58,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 132. [2021-11-25 20:41:58,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 97 states have (on average 1.0206185567010309) internal successors, (99), 97 states have internal predecessors, (99), 18 states have call successors, (18), 16 states have call predecessors, (18), 16 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 20:41:58,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 135 transitions. [2021-11-25 20:41:58,155 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 135 transitions. Word has length 133 [2021-11-25 20:41:58,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:58,156 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 135 transitions. [2021-11-25 20:41:58,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.6346153846153846) internal successors, (137), 52 states have internal predecessors, (137), 17 states have call successors, (18), 1 states have call predecessors, (18), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) [2021-11-25 20:41:58,156 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 135 transitions. [2021-11-25 20:41:58,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-25 20:41:58,157 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:58,158 INFO L514 BasicCegarLoop]: trace histogram [18, 16, 16, 16, 16, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:41:58,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-25 20:41:58,383 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-25 20:41:58,384 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:41:58,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:58,384 INFO L85 PathProgramCache]: Analyzing trace with hash -1876265245, now seen corresponding path program 43 times [2021-11-25 20:41:58,384 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:58,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747987153] [2021-11-25 20:41:58,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:58,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:58,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:59,479 INFO L134 CoverageAnalysis]: Checked inductivity of 983 backedges. 16 proven. 693 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-25 20:41:59,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:59,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747987153] [2021-11-25 20:41:59,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747987153] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:41:59,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58021679] [2021-11-25 20:41:59,479 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:41:59,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:59,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:41:59,480 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:41:59,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-25 20:41:59,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:59,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-25 20:41:59,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:01,061 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 13 treesize of output 9 [2021-11-25 20:42:01,253 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:42:01,253 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 25 treesize of output 24 [2021-11-25 20:42:02,156 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 19 treesize of output 7 [2021-11-25 20:42:02,212 INFO L134 CoverageAnalysis]: Checked inductivity of 983 backedges. 48 proven. 693 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-25 20:42:02,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:02,474 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 23 treesize of output 21 [2021-11-25 20:42:02,477 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 39 treesize of output 35 [2021-11-25 20:42:03,062 INFO L134 CoverageAnalysis]: Checked inductivity of 983 backedges. 16 proven. 693 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-25 20:42:03,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58021679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:03,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2044750111] [2021-11-25 20:42:03,063 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:42:03,063 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:03,064 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:03,064 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:03,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:03,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:03,151 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:42:03,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:42:03,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:03,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:42:03,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:03,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:42:04,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:04,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:04,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:04,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:04,079 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:42:04,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:42:04,219 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 20 treesize of output 16 [2021-11-25 20:42:04,353 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:42:04,355 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:06,017 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37544#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:42:06,018 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:06,018 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:06,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 38] total 75 [2021-11-25 20:42:06,018 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912200752] [2021-11-25 20:42:06,018 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:06,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-25 20:42:06,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:06,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-25 20:42:06,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=7139, Unknown=0, NotChecked=0, Total=7482 [2021-11-25 20:42:06,021 INFO L87 Difference]: Start difference. First operand 132 states and 135 transitions. Second operand has 75 states, 73 states have (on average 2.2739726027397262) internal successors, (166), 70 states have internal predecessors, (166), 34 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (36), 36 states have call predecessors, (36), 34 states have call successors, (36) [2021-11-25 20:42:08,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:08,095 INFO L93 Difference]: Finished difference Result 140 states and 144 transitions. [2021-11-25 20:42:08,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-25 20:42:08,095 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 73 states have (on average 2.2739726027397262) internal successors, (166), 70 states have internal predecessors, (166), 34 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (36), 36 states have call predecessors, (36), 34 states have call successors, (36) Word has length 135 [2021-11-25 20:42:08,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:08,100 INFO L225 Difference]: With dead ends: 140 [2021-11-25 20:42:08,100 INFO L226 Difference]: Without dead ends: 138 [2021-11-25 20:42:08,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 366 SyntacticMatches, 6 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3282 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=474, Invalid=10238, Unknown=0, NotChecked=0, Total=10712 [2021-11-25 20:42:08,101 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 71 mSDsluCounter, 1003 mSDsCounter, 0 mSdLazyCounter, 3257 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 978 SdHoareTripleChecker+Invalid, 3461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 3257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:08,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 978 Invalid, 3461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 3257 Invalid, 0 Unknown, 114 Unchecked, 1.6s Time] [2021-11-25 20:42:08,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-25 20:42:08,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 135. [2021-11-25 20:42:08,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 100 states have (on average 1.02) internal successors, (102), 100 states have internal predecessors, (102), 18 states have call successors, (18), 16 states have call predecessors, (18), 16 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 20:42:08,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 138 transitions. [2021-11-25 20:42:08,139 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 138 transitions. Word has length 135 [2021-11-25 20:42:08,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:08,140 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 138 transitions. [2021-11-25 20:42:08,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 73 states have (on average 2.2739726027397262) internal successors, (166), 70 states have internal predecessors, (166), 34 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (36), 36 states have call predecessors, (36), 34 states have call successors, (36) [2021-11-25 20:42:08,140 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 138 transitions. [2021-11-25 20:42:08,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-25 20:42:08,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:08,141 INFO L514 BasicCegarLoop]: trace histogram [18, 16, 16, 16, 16, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:08,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:08,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-25 20:42:08,342 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:42:08,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:08,342 INFO L85 PathProgramCache]: Analyzing trace with hash -1108012219, now seen corresponding path program 44 times [2021-11-25 20:42:08,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:08,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695394084] [2021-11-25 20:42:08,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:08,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:08,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:09,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 17 proven. 736 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-25 20:42:09,328 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:09,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695394084] [2021-11-25 20:42:09,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695394084] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:09,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833783540] [2021-11-25 20:42:09,329 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:42:09,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:09,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:09,330 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:09,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-25 20:42:11,128 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-25 20:42:11,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:42:11,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-25 20:42:11,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:12,433 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 13 treesize of output 9 [2021-11-25 20:42:13,681 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 19 treesize of output 7 [2021-11-25 20:42:13,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 17 proven. 736 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-25 20:42:13,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:15,099 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 16 treesize of output 14 [2021-11-25 20:42:15,102 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 32 treesize of output 28 [2021-11-25 20:42:16,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 17 proven. 736 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-25 20:42:16,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833783540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:16,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1545131786] [2021-11-25 20:42:16,800 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:42:16,800 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:16,800 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:16,800 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:16,800 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:16,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:16,869 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:42:16,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:42:16,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:16,906 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:42:16,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:42:17,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:17,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:42:17,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:17,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:17,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:17,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:17,848 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:42:17,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:42:17,937 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 20 treesize of output 16 [2021-11-25 20:42:18,096 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:42:18,098 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:20,016 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38946#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:42:20,016 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:20,016 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:20,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 109 [2021-11-25 20:42:20,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608750373] [2021-11-25 20:42:20,017 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:20,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-25 20:42:20,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:20,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-25 20:42:20,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1206, Invalid=13314, Unknown=0, NotChecked=0, Total=14520 [2021-11-25 20:42:20,019 INFO L87 Difference]: Start difference. First operand 135 states and 138 transitions. Second operand has 109 states, 108 states have (on average 2.287037037037037) internal successors, (247), 104 states have internal predecessors, (247), 49 states have call successors, (50), 1 states have call predecessors, (50), 2 states have return successors, (51), 51 states have call predecessors, (51), 49 states have call successors, (51) [2021-11-25 20:42:29,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:29,118 INFO L93 Difference]: Finished difference Result 250 states and 272 transitions. [2021-11-25 20:42:29,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-25 20:42:29,119 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 108 states have (on average 2.287037037037037) internal successors, (247), 104 states have internal predecessors, (247), 49 states have call successors, (50), 1 states have call predecessors, (50), 2 states have return successors, (51), 51 states have call predecessors, (51), 49 states have call successors, (51) Word has length 138 [2021-11-25 20:42:29,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:29,120 INFO L225 Difference]: With dead ends: 250 [2021-11-25 20:42:29,120 INFO L226 Difference]: Without dead ends: 248 [2021-11-25 20:42:29,124 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 332 SyntacticMatches, 1 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13328 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=3700, Invalid=38530, Unknown=0, NotChecked=0, Total=42230 [2021-11-25 20:42:29,125 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 285 mSDsluCounter, 1718 mSDsCounter, 0 mSdLazyCounter, 4715 mSolverCounterSat, 556 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 1715 SdHoareTripleChecker+Invalid, 5271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 556 IncrementalHoareTripleChecker+Valid, 4715 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:29,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [287 Valid, 1715 Invalid, 5271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [556 Valid, 4715 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-25 20:42:29,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-11-25 20:42:29,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 189. [2021-11-25 20:42:29,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 153 states have (on average 1.0196078431372548) internal successors, (156), 153 states have internal predecessors, (156), 19 states have call successors, (19), 16 states have call predecessors, (19), 16 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-25 20:42:29,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 194 transitions. [2021-11-25 20:42:29,188 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 194 transitions. Word has length 138 [2021-11-25 20:42:29,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:29,189 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 194 transitions. [2021-11-25 20:42:29,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 108 states have (on average 2.287037037037037) internal successors, (247), 104 states have internal predecessors, (247), 49 states have call successors, (50), 1 states have call predecessors, (50), 2 states have return successors, (51), 51 states have call predecessors, (51), 49 states have call successors, (51) [2021-11-25 20:42:29,189 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 194 transitions. [2021-11-25 20:42:29,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 20:42:29,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:29,190 INFO L514 BasicCegarLoop]: trace histogram [19, 17, 17, 17, 17, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:29,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:29,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-25 20:42:29,396 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:42:29,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:29,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1314700036, now seen corresponding path program 45 times [2021-11-25 20:42:29,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:29,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900991341] [2021-11-25 20:42:29,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:29,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:29,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:30,611 INFO L134 CoverageAnalysis]: Checked inductivity of 1112 backedges. 17 proven. 787 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-25 20:42:30,611 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:30,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900991341] [2021-11-25 20:42:30,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1900991341] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:30,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850336589] [2021-11-25 20:42:30,612 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:42:30,612 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:30,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:30,613 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:30,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-25 20:42:31,216 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:42:31,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:42:31,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-25 20:42:31,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:32,496 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 13 treesize of output 9 [2021-11-25 20:42:32,682 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:42:32,683 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 25 treesize of output 24 [2021-11-25 20:42:33,681 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 19 treesize of output 7 [2021-11-25 20:42:33,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1112 backedges. 51 proven. 787 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-25 20:42:33,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:34,029 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 23 treesize of output 21 [2021-11-25 20:42:34,032 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 39 treesize of output 35 [2021-11-25 20:42:34,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1112 backedges. 17 proven. 787 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-25 20:42:34,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [850336589] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:34,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1945408680] [2021-11-25 20:42:34,586 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:42:34,587 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:34,587 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:34,587 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:34,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:34,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:34,665 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:42:34,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:42:34,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:34,702 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:42:34,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:42:34,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:34,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:42:35,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:35,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:35,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:35,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:35,658 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:42:35,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:42:35,762 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 20 treesize of output 16 [2021-11-25 20:42:35,899 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:42:35,901 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:37,652 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40687#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:42:37,652 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:37,652 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:37,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 40] total 77 [2021-11-25 20:42:37,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459674983] [2021-11-25 20:42:37,653 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:37,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-25 20:42:37,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:37,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-25 20:42:37,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=7482, Unknown=0, NotChecked=0, Total=7832 [2021-11-25 20:42:37,655 INFO L87 Difference]: Start difference. First operand 189 states and 194 transitions. Second operand has 77 states, 76 states have (on average 2.289473684210526) internal successors, (174), 73 states have internal predecessors, (174), 35 states have call successors, (36), 2 states have call predecessors, (36), 3 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) [2021-11-25 20:42:41,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:41,543 INFO L93 Difference]: Finished difference Result 248 states and 253 transitions. [2021-11-25 20:42:41,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-11-25 20:42:41,543 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 2.289473684210526) internal successors, (174), 73 states have internal predecessors, (174), 35 states have call successors, (36), 2 states have call predecessors, (36), 3 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) Word has length 143 [2021-11-25 20:42:41,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:41,546 INFO L225 Difference]: With dead ends: 248 [2021-11-25 20:42:41,546 INFO L226 Difference]: Without dead ends: 246 [2021-11-25 20:42:41,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 375 SyntacticMatches, 6 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6315 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=941, Invalid=19651, Unknown=0, NotChecked=0, Total=20592 [2021-11-25 20:42:41,548 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 129 mSDsluCounter, 1679 mSDsCounter, 0 mSdLazyCounter, 4517 mSolverCounterSat, 294 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 1649 SdHoareTripleChecker+Invalid, 4899 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 294 IncrementalHoareTripleChecker+Valid, 4517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:41,549 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 1649 Invalid, 4899 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [294 Valid, 4517 Invalid, 0 Unknown, 88 Unchecked, 2.2s Time] [2021-11-25 20:42:41,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2021-11-25 20:42:41,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 191. [2021-11-25 20:42:41,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 19 states have call successors, (19), 17 states have call predecessors, (19), 17 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-25 20:42:41,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 195 transitions. [2021-11-25 20:42:41,643 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 195 transitions. Word has length 143 [2021-11-25 20:42:41,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:41,643 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 195 transitions. [2021-11-25 20:42:41,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 76 states have (on average 2.289473684210526) internal successors, (174), 73 states have internal predecessors, (174), 35 states have call successors, (36), 2 states have call predecessors, (36), 3 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) [2021-11-25 20:42:41,644 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 195 transitions. [2021-11-25 20:42:41,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-25 20:42:41,644 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:41,645 INFO L514 BasicCegarLoop]: trace histogram [19, 17, 17, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:41,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:41,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-25 20:42:41,848 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:42:41,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:41,848 INFO L85 PathProgramCache]: Analyzing trace with hash 427511684, now seen corresponding path program 46 times [2021-11-25 20:42:41,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:41,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709203457] [2021-11-25 20:42:41,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:41,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:41,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:43,100 INFO L134 CoverageAnalysis]: Checked inductivity of 1159 backedges. 18 proven. 833 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-25 20:42:43,100 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:43,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709203457] [2021-11-25 20:42:43,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709203457] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:43,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592726601] [2021-11-25 20:42:43,101 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:42:43,101 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:43,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:43,102 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:43,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-25 20:42:43,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:43,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-25 20:42:43,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:44,925 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 20:42:46,051 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 19 treesize of output 7 [2021-11-25 20:42:46,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1159 backedges. 18 proven. 833 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-25 20:42:46,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:46,390 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 16 treesize of output 14 [2021-11-25 20:42:46,393 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 32 treesize of output 28 [2021-11-25 20:42:46,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1159 backedges. 18 proven. 833 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-25 20:42:46,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592726601] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:46,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [757845003] [2021-11-25 20:42:46,928 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:42:46,928 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:46,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:46,929 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:46,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:46,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:47,002 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:42:47,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:42:47,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:47,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:42:47,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:47,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:42:47,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:47,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:47,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:47,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:47,983 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:42:47,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:42:48,094 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 20 treesize of output 16 [2021-11-25 20:42:48,227 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:42:48,229 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:49,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42389#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:42:49,969 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:49,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:49,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 78 [2021-11-25 20:42:49,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558519942] [2021-11-25 20:42:49,969 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:49,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-25 20:42:49,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:49,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-25 20:42:49,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=7693, Unknown=0, NotChecked=0, Total=8010 [2021-11-25 20:42:49,971 INFO L87 Difference]: Start difference. First operand 191 states and 195 transitions. Second operand has 78 states, 77 states have (on average 2.324675324675325) internal successors, (179), 74 states have internal predecessors, (179), 35 states have call successors, (36), 1 states have call predecessors, (36), 2 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) [2021-11-25 20:42:55,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:55,034 INFO L93 Difference]: Finished difference Result 308 states and 315 transitions. [2021-11-25 20:42:55,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-25 20:42:55,035 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 77 states have (on average 2.324675324675325) internal successors, (179), 74 states have internal predecessors, (179), 35 states have call successors, (36), 1 states have call predecessors, (36), 2 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) Word has length 146 [2021-11-25 20:42:55,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:55,037 INFO L225 Difference]: With dead ends: 308 [2021-11-25 20:42:55,037 INFO L226 Difference]: Without dead ends: 306 [2021-11-25 20:42:55,039 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 386 SyntacticMatches, 4 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5902 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=912, Invalid=19968, Unknown=0, NotChecked=0, Total=20880 [2021-11-25 20:42:55,040 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 96 mSDsluCounter, 2614 mSDsCounter, 0 mSdLazyCounter, 6702 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 2628 SdHoareTripleChecker+Invalid, 6886 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 6702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:55,040 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 2628 Invalid, 6886 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [184 Valid, 6702 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-25 20:42:55,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2021-11-25 20:42:55,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 194. [2021-11-25 20:42:55,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 156 states have (on average 1.0256410256410255) internal successors, (160), 156 states have internal predecessors, (160), 20 states have call successors, (20), 17 states have call predecessors, (20), 17 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 20:42:55,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 200 transitions. [2021-11-25 20:42:55,115 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 200 transitions. Word has length 146 [2021-11-25 20:42:55,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:55,116 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 200 transitions. [2021-11-25 20:42:55,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 77 states have (on average 2.324675324675325) internal successors, (179), 74 states have internal predecessors, (179), 35 states have call successors, (36), 1 states have call predecessors, (36), 2 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) [2021-11-25 20:42:55,116 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 200 transitions. [2021-11-25 20:42:55,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-25 20:42:55,117 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:55,117 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:55,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:55,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-25 20:42:55,318 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:42:55,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:55,318 INFO L85 PathProgramCache]: Analyzing trace with hash 1428056836, now seen corresponding path program 47 times [2021-11-25 20:42:55,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:55,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399392862] [2021-11-25 20:42:55,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:55,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:55,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:55,990 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 393 proven. 474 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-25 20:42:55,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:55,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399392862] [2021-11-25 20:42:55,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [399392862] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:55,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703631305] [2021-11-25 20:42:55,991 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:42:55,991 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:55,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:55,993 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:56,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-25 20:42:58,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-25 20:42:58,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:42:58,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 20:42:58,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:59,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 442 proven. 425 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-25 20:42:59,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:59,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 442 proven. 425 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-25 20:42:59,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703631305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:59,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [979244608] [2021-11-25 20:42:59,643 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:42:59,643 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:59,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:59,643 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:59,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:59,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:59,713 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:42:59,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:42:59,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:59,749 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:42:59,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:42:59,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:59,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:43:00,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:00,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:00,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:00,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:00,693 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:43:00,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:43:00,773 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 20 treesize of output 16 [2021-11-25 20:43:00,895 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:43:00,897 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:43:02,113 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44174#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:43:02,113 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:43:02,113 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:43:02,114 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 58 [2021-11-25 20:43:02,114 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378694304] [2021-11-25 20:43:02,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:43:02,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-25 20:43:02,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:43:02,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-25 20:43:02,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=831, Invalid=3999, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 20:43:02,115 INFO L87 Difference]: Start difference. First operand 194 states and 200 transitions. Second operand has 58 states, 58 states have (on average 2.6379310344827585) internal successors, (153), 58 states have internal predecessors, (153), 19 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2021-11-25 20:43:03,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:43:03,175 INFO L93 Difference]: Finished difference Result 311 states and 318 transitions. [2021-11-25 20:43:03,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-25 20:43:03,176 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.6379310344827585) internal successors, (153), 58 states have internal predecessors, (153), 19 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) Word has length 149 [2021-11-25 20:43:03,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:43:03,178 INFO L225 Difference]: With dead ends: 311 [2021-11-25 20:43:03,178 INFO L226 Difference]: Without dead ends: 159 [2021-11-25 20:43:03,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 415 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3125 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1903, Invalid=8809, Unknown=0, NotChecked=0, Total=10712 [2021-11-25 20:43:03,179 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 244 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 199 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 199 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:43:03,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 279 Invalid, 720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [199 Valid, 521 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:43:03,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-25 20:43:03,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 146. [2021-11-25 20:43:03,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 108 states have (on average 1.0185185185185186) internal successors, (110), 108 states have internal predecessors, (110), 20 states have call successors, (20), 17 states have call predecessors, (20), 17 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 20:43:03,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 150 transitions. [2021-11-25 20:43:03,233 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 150 transitions. Word has length 149 [2021-11-25 20:43:03,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:43:03,233 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 150 transitions. [2021-11-25 20:43:03,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.6379310344827585) internal successors, (153), 58 states have internal predecessors, (153), 19 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2021-11-25 20:43:03,233 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 150 transitions. [2021-11-25 20:43:03,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-25 20:43:03,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:43:03,235 INFO L514 BasicCegarLoop]: trace histogram [20, 18, 18, 18, 18, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:43:03,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-25 20:43:03,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:03,440 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:43:03,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:43:03,440 INFO L85 PathProgramCache]: Analyzing trace with hash -1772435389, now seen corresponding path program 48 times [2021-11-25 20:43:03,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:43:03,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644003249] [2021-11-25 20:43:03,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:43:03,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:43:03,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:04,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 18 proven. 887 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-25 20:43:04,760 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:43:04,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644003249] [2021-11-25 20:43:04,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644003249] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:43:04,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130688737] [2021-11-25 20:43:04,761 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:43:04,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:04,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:43:04,762 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:43:04,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-25 20:43:05,218 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:43:05,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:43:05,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 574 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-25 20:43:05,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:43:06,628 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 13 treesize of output 9 [2021-11-25 20:43:06,826 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:43:06,826 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 25 treesize of output 24 [2021-11-25 20:43:07,922 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 19 treesize of output 7 [2021-11-25 20:43:07,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 54 proven. 887 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-25 20:43:07,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:43:08,321 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 23 treesize of output 21 [2021-11-25 20:43:08,324 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 39 treesize of output 35 [2021-11-25 20:43:08,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 18 proven. 887 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-25 20:43:08,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130688737] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:43:08,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1835028191] [2021-11-25 20:43:08,888 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:43:08,888 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:43:08,888 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:43:08,889 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:43:08,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:43:09,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:09,026 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:43:09,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:43:09,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:09,070 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:43:09,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:43:09,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:09,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:43:10,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:10,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:10,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:10,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:10,060 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:43:10,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:43:10,183 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 20 treesize of output 16 [2021-11-25 20:43:10,320 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:43:10,322 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:43:12,121 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45892#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:43:12,121 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:43:12,121 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:43:12,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 43, 42] total 81 [2021-11-25 20:43:12,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664593515] [2021-11-25 20:43:12,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:43:12,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-25 20:43:12,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:43:12,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-25 20:43:12,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=8190, Unknown=0, NotChecked=0, Total=8556 [2021-11-25 20:43:12,124 INFO L87 Difference]: Start difference. First operand 146 states and 150 transitions. Second operand has 81 states, 80 states have (on average 2.3) internal successors, (184), 77 states have internal predecessors, (184), 37 states have call successors, (38), 2 states have call predecessors, (38), 3 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) [2021-11-25 20:43:14,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:43:14,791 INFO L93 Difference]: Finished difference Result 156 states and 160 transitions. [2021-11-25 20:43:14,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-25 20:43:14,792 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 2.3) internal successors, (184), 77 states have internal predecessors, (184), 37 states have call successors, (38), 2 states have call predecessors, (38), 3 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) Word has length 151 [2021-11-25 20:43:14,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:43:14,793 INFO L225 Difference]: With dead ends: 156 [2021-11-25 20:43:14,793 INFO L226 Difference]: Without dead ends: 154 [2021-11-25 20:43:14,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 515 GetRequests, 398 SyntacticMatches, 6 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3875 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=519, Invalid=12137, Unknown=0, NotChecked=0, Total=12656 [2021-11-25 20:43:14,795 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 62 mSDsluCounter, 1645 mSDsCounter, 0 mSdLazyCounter, 4523 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 1641 SdHoareTripleChecker+Invalid, 4724 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 4523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:43:14,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 1641 Invalid, 4724 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 4523 Invalid, 0 Unknown, 65 Unchecked, 2.1s Time] [2021-11-25 20:43:14,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-25 20:43:14,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 151. [2021-11-25 20:43:14,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 112 states have (on average 1.0178571428571428) internal successors, (114), 112 states have internal predecessors, (114), 20 states have call successors, (20), 18 states have call predecessors, (20), 18 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 20:43:14,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 154 transitions. [2021-11-25 20:43:14,870 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 154 transitions. Word has length 151 [2021-11-25 20:43:14,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:43:14,871 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 154 transitions. [2021-11-25 20:43:14,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 80 states have (on average 2.3) internal successors, (184), 77 states have internal predecessors, (184), 37 states have call successors, (38), 2 states have call predecessors, (38), 3 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) [2021-11-25 20:43:14,871 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 154 transitions. [2021-11-25 20:43:14,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-25 20:43:14,873 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:43:14,873 INFO L514 BasicCegarLoop]: trace histogram [20, 18, 18, 18, 18, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:43:14,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-25 20:43:15,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:15,088 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:43:15,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:43:15,088 INFO L85 PathProgramCache]: Analyzing trace with hash -289225243, now seen corresponding path program 49 times [2021-11-25 20:43:15,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:43:15,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105470007] [2021-11-25 20:43:15,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:43:15,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:43:15,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:16,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1299 backedges. 19 proven. 936 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-25 20:43:16,391 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:43:16,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105470007] [2021-11-25 20:43:16,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105470007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:43:16,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951906806] [2021-11-25 20:43:16,392 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:43:16,392 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:16,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:43:16,393 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:43:16,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-25 20:43:16,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:16,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 584 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-25 20:43:16,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:43:18,253 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 20:43:19,439 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 19 treesize of output 7 [2021-11-25 20:43:19,498 INFO L134 CoverageAnalysis]: Checked inductivity of 1299 backedges. 19 proven. 936 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-25 20:43:19,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:43:19,753 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 16 treesize of output 14 [2021-11-25 20:43:19,755 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 32 treesize of output 28 [2021-11-25 20:43:20,323 INFO L134 CoverageAnalysis]: Checked inductivity of 1299 backedges. 19 proven. 936 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-25 20:43:20,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [951906806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:43:20,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [62327280] [2021-11-25 20:43:20,325 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:43:20,325 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:43:20,325 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:43:20,325 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:43:20,326 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:43:20,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:20,417 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:43:20,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:43:20,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:20,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:43:20,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:20,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:43:21,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:21,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:21,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:21,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:21,363 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:43:21,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:43:21,428 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 20 treesize of output 16 [2021-11-25 20:43:21,555 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:43:21,556 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:43:23,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47404#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:43:23,215 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:43:23,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:43:23,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 82 [2021-11-25 20:43:23,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938495308] [2021-11-25 20:43:23,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:43:23,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-25 20:43:23,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:43:23,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-25 20:43:23,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=8411, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 20:43:23,218 INFO L87 Difference]: Start difference. First operand 151 states and 154 transitions. Second operand has 82 states, 81 states have (on average 2.3333333333333335) internal successors, (189), 78 states have internal predecessors, (189), 37 states have call successors, (38), 1 states have call predecessors, (38), 2 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) [2021-11-25 20:43:27,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:43:27,981 INFO L93 Difference]: Finished difference Result 224 states and 230 transitions. [2021-11-25 20:43:27,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-25 20:43:27,982 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 81 states have (on average 2.3333333333333335) internal successors, (189), 78 states have internal predecessors, (189), 37 states have call successors, (38), 1 states have call predecessors, (38), 2 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) Word has length 154 [2021-11-25 20:43:27,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:43:27,983 INFO L225 Difference]: With dead ends: 224 [2021-11-25 20:43:27,983 INFO L226 Difference]: Without dead ends: 222 [2021-11-25 20:43:27,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 562 GetRequests, 408 SyntacticMatches, 4 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6508 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=959, Invalid=21993, Unknown=0, NotChecked=0, Total=22952 [2021-11-25 20:43:27,987 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 175 mSDsluCounter, 1943 mSDsCounter, 0 mSdLazyCounter, 5576 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 1947 SdHoareTripleChecker+Invalid, 5920 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 5576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:43:27,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 1947 Invalid, 5920 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [344 Valid, 5576 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-11-25 20:43:27,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-11-25 20:43:28,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 157. [2021-11-25 20:43:28,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 117 states have (on average 1.0256410256410255) internal successors, (120), 117 states have internal predecessors, (120), 21 states have call successors, (21), 18 states have call predecessors, (21), 18 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-25 20:43:28,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 162 transitions. [2021-11-25 20:43:28,100 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 162 transitions. Word has length 154 [2021-11-25 20:43:28,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:43:28,100 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 162 transitions. [2021-11-25 20:43:28,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 81 states have (on average 2.3333333333333335) internal successors, (189), 78 states have internal predecessors, (189), 37 states have call successors, (38), 1 states have call predecessors, (38), 2 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) [2021-11-25 20:43:28,101 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 162 transitions. [2021-11-25 20:43:28,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-25 20:43:28,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:43:28,102 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:43:28,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-25 20:43:28,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-25 20:43:28,318 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:43:28,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:43:28,319 INFO L85 PathProgramCache]: Analyzing trace with hash -599307005, now seen corresponding path program 50 times [2021-11-25 20:43:28,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:43:28,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647922775] [2021-11-25 20:43:28,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:43:28,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:43:28,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:29,049 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 443 proven. 529 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-25 20:43:29,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:43:29,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647922775] [2021-11-25 20:43:29,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647922775] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:43:29,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054620682] [2021-11-25 20:43:29,050 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:43:29,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:29,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:43:29,052 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:43:29,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-25 20:43:31,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-11-25 20:43:31,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:43:31,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 594 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-25 20:43:31,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:43:32,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 495 proven. 477 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-25 20:43:32,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:43:32,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 495 proven. 477 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-25 20:43:32,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054620682] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:43:32,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [459369495] [2021-11-25 20:43:32,504 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:43:32,504 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:43:32,504 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:43:32,504 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:43:32,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:43:32,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:32,582 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:43:32,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:43:32,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:32,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:43:32,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:32,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:43:33,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:33,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:33,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:33,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:33,532 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:43:33,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:43:33,596 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-25 20:43:33,725 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:43:33,727 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:43:34,927 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49087#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:43:34,927 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:43:34,927 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:43:34,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2021-11-25 20:43:34,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740210787] [2021-11-25 20:43:34,928 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:43:34,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-25 20:43:34,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:43:34,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-25 20:43:34,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=912, Invalid=4344, Unknown=0, NotChecked=0, Total=5256 [2021-11-25 20:43:34,930 INFO L87 Difference]: Start difference. First operand 157 states and 162 transitions. Second operand has 61 states, 61 states have (on average 2.639344262295082) internal successors, (161), 61 states have internal predecessors, (161), 20 states have call successors, (21), 1 states have call predecessors, (21), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) [2021-11-25 20:43:35,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:43:35,600 INFO L93 Difference]: Finished difference Result 227 states and 233 transitions. [2021-11-25 20:43:35,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 20:43:35,600 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.639344262295082) internal successors, (161), 61 states have internal predecessors, (161), 20 states have call successors, (21), 1 states have call predecessors, (21), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) Word has length 157 [2021-11-25 20:43:35,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:43:35,602 INFO L225 Difference]: With dead ends: 227 [2021-11-25 20:43:35,602 INFO L226 Difference]: Without dead ends: 167 [2021-11-25 20:43:35,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 438 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2460 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1497, Invalid=6693, Unknown=0, NotChecked=0, Total=8190 [2021-11-25 20:43:35,603 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 209 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 483 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:43:35,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 239 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 483 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:43:35,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-25 20:43:35,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 154. [2021-11-25 20:43:35,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 114 states have (on average 1.0175438596491229) internal successors, (116), 114 states have internal predecessors, (116), 21 states have call successors, (21), 18 states have call predecessors, (21), 18 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-25 20:43:35,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 158 transitions. [2021-11-25 20:43:35,684 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 158 transitions. Word has length 157 [2021-11-25 20:43:35,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:43:35,684 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 158 transitions. [2021-11-25 20:43:35,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.639344262295082) internal successors, (161), 61 states have internal predecessors, (161), 20 states have call successors, (21), 1 states have call predecessors, (21), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) [2021-11-25 20:43:35,685 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 158 transitions. [2021-11-25 20:43:35,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-25 20:43:35,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:43:35,686 INFO L514 BasicCegarLoop]: trace histogram [21, 19, 19, 19, 19, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:43:35,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-25 20:43:35,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-25 20:43:35,899 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:43:35,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:43:35,900 INFO L85 PathProgramCache]: Analyzing trace with hash -809955420, now seen corresponding path program 51 times [2021-11-25 20:43:35,900 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:43:35,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788340363] [2021-11-25 20:43:35,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:43:35,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:43:36,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:37,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1394 backedges. 19 proven. 993 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-25 20:43:37,109 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:43:37,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788340363] [2021-11-25 20:43:37,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788340363] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:43:37,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997925862] [2021-11-25 20:43:37,109 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:43:37,110 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:37,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:43:37,110 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:43:37,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-25 20:43:37,696 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:43:37,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:43:37,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 603 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-25 20:43:37,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:43:39,217 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 13 treesize of output 9 [2021-11-25 20:43:39,418 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:43:39,419 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 25 treesize of output 24 [2021-11-25 20:43:40,629 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 19 treesize of output 7 [2021-11-25 20:43:40,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1394 backedges. 57 proven. 993 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-25 20:43:40,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:43:41,009 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 23 treesize of output 21 [2021-11-25 20:43:41,012 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 39 treesize of output 35 [2021-11-25 20:43:41,593 INFO L134 CoverageAnalysis]: Checked inductivity of 1394 backedges. 19 proven. 993 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-25 20:43:41,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997925862] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:43:41,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [530484692] [2021-11-25 20:43:41,595 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:43:41,595 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:43:41,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:43:41,595 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:43:41,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:43:41,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:41,674 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:43:41,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:43:41,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:41,708 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:43:41,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:43:41,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:41,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:43:42,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:42,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:42,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:42,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:42,814 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:43:42,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:43:42,976 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 20 treesize of output 16 [2021-11-25 20:43:43,134 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:43:43,137 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:43:45,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50726#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:43:45,035 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:43:45,035 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:43:45,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 44] total 85 [2021-11-25 20:43:45,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160420463] [2021-11-25 20:43:45,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:43:45,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-25 20:43:45,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:43:45,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-25 20:43:45,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=8930, Unknown=0, NotChecked=0, Total=9312 [2021-11-25 20:43:45,038 INFO L87 Difference]: Start difference. First operand 154 states and 158 transitions. Second operand has 85 states, 84 states have (on average 2.3095238095238093) internal successors, (194), 81 states have internal predecessors, (194), 39 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (41), 41 states have call predecessors, (41), 39 states have call successors, (41) [2021-11-25 20:43:47,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:43:47,687 INFO L93 Difference]: Finished difference Result 217 states and 223 transitions. [2021-11-25 20:43:47,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-25 20:43:47,688 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 2.3095238095238093) internal successors, (194), 81 states have internal predecessors, (194), 39 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (41), 41 states have call predecessors, (41), 39 states have call successors, (41) Word has length 159 [2021-11-25 20:43:47,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:43:47,690 INFO L225 Difference]: With dead ends: 217 [2021-11-25 20:43:47,690 INFO L226 Difference]: Without dead ends: 215 [2021-11-25 20:43:47,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 437 SyntacticMatches, 6 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4222 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=546, Invalid=13260, Unknown=0, NotChecked=0, Total=13806 [2021-11-25 20:43:47,691 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 87 mSDsluCounter, 1622 mSDsCounter, 0 mSdLazyCounter, 4366 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 1588 SdHoareTripleChecker+Invalid, 4578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 4366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 136 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:43:47,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 1588 Invalid, 4578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 4366 Invalid, 0 Unknown, 136 Unchecked, 2.0s Time] [2021-11-25 20:43:47,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-11-25 20:43:47,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 162. [2021-11-25 20:43:47,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 22 states have call successors, (22), 19 states have call predecessors, (22), 19 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-25 20:43:47,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 167 transitions. [2021-11-25 20:43:47,753 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 167 transitions. Word has length 159 [2021-11-25 20:43:47,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:43:47,753 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 167 transitions. [2021-11-25 20:43:47,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 84 states have (on average 2.3095238095238093) internal successors, (194), 81 states have internal predecessors, (194), 39 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (41), 41 states have call predecessors, (41), 39 states have call successors, (41) [2021-11-25 20:43:47,753 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 167 transitions. [2021-11-25 20:43:47,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-11-25 20:43:47,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:43:47,754 INFO L514 BasicCegarLoop]: trace histogram [21, 19, 19, 19, 19, 19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:43:47,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-25 20:43:47,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:47,955 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:43:47,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:43:47,956 INFO L85 PathProgramCache]: Analyzing trace with hash -250136860, now seen corresponding path program 52 times [2021-11-25 20:43:47,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:43:47,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236162365] [2021-11-25 20:43:47,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:43:47,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:43:48,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:49,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1447 backedges. 20 proven. 1045 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-25 20:43:49,219 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:43:49,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236162365] [2021-11-25 20:43:49,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236162365] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:43:49,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973929679] [2021-11-25 20:43:49,219 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:43:49,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:49,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:43:49,220 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:43:49,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-25 20:43:49,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:49,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-25 20:43:49,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:43:51,100 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 20:43:52,412 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 19 treesize of output 7 [2021-11-25 20:43:52,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1447 backedges. 20 proven. 1045 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-25 20:43:52,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:43:52,739 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 16 treesize of output 14 [2021-11-25 20:43:52,741 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 32 treesize of output 28 [2021-11-25 20:43:53,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1447 backedges. 20 proven. 1045 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-25 20:43:53,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973929679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:43:53,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [247598411] [2021-11-25 20:43:53,328 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:43:53,329 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:43:53,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:43:53,329 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:43:53,329 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:43:53,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:53,400 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:43:53,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:43:53,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:53,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:43:53,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:53,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:43:54,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:54,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:54,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:54,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:54,460 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:43:54,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:43:54,528 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 20 treesize of output 16 [2021-11-25 20:43:54,653 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:43:54,655 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:43:56,380 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52410#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:43:56,380 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:43:56,380 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:43:56,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 86 [2021-11-25 20:43:56,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907399561] [2021-11-25 20:43:56,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:43:56,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-25 20:43:56,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:43:56,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-25 20:43:56,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=9161, Unknown=0, NotChecked=0, Total=9506 [2021-11-25 20:43:56,383 INFO L87 Difference]: Start difference. First operand 162 states and 167 transitions. Second operand has 86 states, 85 states have (on average 2.3411764705882354) internal successors, (199), 82 states have internal predecessors, (199), 39 states have call successors, (40), 1 states have call predecessors, (40), 2 states have return successors, (41), 41 states have call predecessors, (41), 39 states have call successors, (41) [2021-11-25 20:44:01,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:44:01,930 INFO L93 Difference]: Finished difference Result 237 states and 243 transitions. [2021-11-25 20:44:01,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-25 20:44:01,930 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 2.3411764705882354) internal successors, (199), 82 states have internal predecessors, (199), 39 states have call successors, (40), 1 states have call predecessors, (40), 2 states have return successors, (41), 41 states have call predecessors, (41), 39 states have call successors, (41) Word has length 162 [2021-11-25 20:44:01,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:44:01,932 INFO L225 Difference]: With dead ends: 237 [2021-11-25 20:44:01,932 INFO L226 Difference]: Without dead ends: 235 [2021-11-25 20:44:01,934 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 430 SyntacticMatches, 4 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7137 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=1006, Invalid=24116, Unknown=0, NotChecked=0, Total=25122 [2021-11-25 20:44:01,934 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 180 mSDsluCounter, 2590 mSDsCounter, 0 mSdLazyCounter, 6855 mSolverCounterSat, 352 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 2584 SdHoareTripleChecker+Invalid, 7207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 352 IncrementalHoareTripleChecker+Valid, 6855 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:44:01,934 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 2584 Invalid, 7207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [352 Valid, 6855 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2021-11-25 20:44:01,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-11-25 20:44:02,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 165. [2021-11-25 20:44:02,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 123 states have (on average 1.024390243902439) internal successors, (126), 123 states have internal predecessors, (126), 22 states have call successors, (22), 19 states have call predecessors, (22), 19 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-25 20:44:02,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 170 transitions. [2021-11-25 20:44:02,015 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 170 transitions. Word has length 162 [2021-11-25 20:44:02,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:44:02,015 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 170 transitions. [2021-11-25 20:44:02,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 2.3411764705882354) internal successors, (199), 82 states have internal predecessors, (199), 39 states have call successors, (40), 1 states have call predecessors, (40), 2 states have return successors, (41), 41 states have call predecessors, (41), 39 states have call successors, (41) [2021-11-25 20:44:02,015 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 170 transitions. [2021-11-25 20:44:02,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-25 20:44:02,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:44:02,017 INFO L514 BasicCegarLoop]: trace histogram [22, 20, 20, 20, 20, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:44:02,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-25 20:44:02,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:02,232 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:44:02,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:44:02,232 INFO L85 PathProgramCache]: Analyzing trace with hash -264895163, now seen corresponding path program 53 times [2021-11-25 20:44:02,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:44:02,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604837194] [2021-11-25 20:44:02,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:44:02,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:44:02,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:03,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1494 backedges. 19 proven. 1053 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-25 20:44:03,553 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:44:03,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604837194] [2021-11-25 20:44:03,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604837194] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:44:03,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1183756240] [2021-11-25 20:44:03,554 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:44:03,554 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:03,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:44:03,555 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:44:03,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-25 20:44:06,982 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-25 20:44:06,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:44:06,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 622 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-25 20:44:06,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:44:08,520 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 20:44:08,654 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:44:08,654 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 25 treesize of output 24 [2021-11-25 20:44:08,859 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:44:08,860 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 25 treesize of output 24 [2021-11-25 20:44:10,065 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 19 treesize of output 7 [2021-11-25 20:44:10,127 INFO L134 CoverageAnalysis]: Checked inductivity of 1494 backedges. 98 proven. 1050 refuted. 0 times theorem prover too weak. 346 trivial. 0 not checked. [2021-11-25 20:44:10,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:44:10,490 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 20 treesize of output 18 [2021-11-25 20:44:10,493 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 36 treesize of output 32 [2021-11-25 20:44:11,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1494 backedges. 19 proven. 1053 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-25 20:44:11,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1183756240] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:44:11,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [97344924] [2021-11-25 20:44:11,067 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:44:11,067 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:44:11,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:44:11,068 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:44:11,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:44:11,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:11,138 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:44:11,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:44:11,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:11,173 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:44:11,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:44:11,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:11,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:44:12,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:12,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:12,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:12,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:12,120 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:44:12,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:44:12,187 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 20 treesize of output 16 [2021-11-25 20:44:12,343 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:44:12,345 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:44:14,128 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54196#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:44:14,128 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:44:14,128 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:44:14,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 46, 45] total 86 [2021-11-25 20:44:14,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755478625] [2021-11-25 20:44:14,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:44:14,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-25 20:44:14,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:44:14,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-25 20:44:14,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=9118, Unknown=0, NotChecked=0, Total=9506 [2021-11-25 20:44:14,131 INFO L87 Difference]: Start difference. First operand 165 states and 170 transitions. Second operand has 86 states, 85 states have (on average 2.3176470588235296) internal successors, (197), 82 states have internal predecessors, (197), 40 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (43), 42 states have call predecessors, (43), 40 states have call successors, (43) [2021-11-25 20:44:17,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:44:17,419 INFO L93 Difference]: Finished difference Result 224 states and 228 transitions. [2021-11-25 20:44:17,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-25 20:44:17,420 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 2.3176470588235296) internal successors, (197), 82 states have internal predecessors, (197), 40 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (43), 42 states have call predecessors, (43), 40 states have call successors, (43) Word has length 164 [2021-11-25 20:44:17,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:44:17,421 INFO L225 Difference]: With dead ends: 224 [2021-11-25 20:44:17,421 INFO L226 Difference]: Without dead ends: 222 [2021-11-25 20:44:17,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 431 SyntacticMatches, 9 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4474 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=549, Invalid=13493, Unknown=0, NotChecked=0, Total=14042 [2021-11-25 20:44:17,422 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 65 mSDsluCounter, 2134 mSDsCounter, 0 mSdLazyCounter, 5569 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 2124 SdHoareTripleChecker+Invalid, 5778 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 5569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 67 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:44:17,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 2124 Invalid, 5778 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 5569 Invalid, 0 Unknown, 67 Unchecked, 2.6s Time] [2021-11-25 20:44:17,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-11-25 20:44:17,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 167. [2021-11-25 20:44:17,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 22 states have call successors, (22), 20 states have call predecessors, (22), 20 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-25 20:44:17,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 171 transitions. [2021-11-25 20:44:17,504 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 171 transitions. Word has length 164 [2021-11-25 20:44:17,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:44:17,505 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 171 transitions. [2021-11-25 20:44:17,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 2.3176470588235296) internal successors, (197), 82 states have internal predecessors, (197), 40 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (43), 42 states have call predecessors, (43), 40 states have call successors, (43) [2021-11-25 20:44:17,505 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 171 transitions. [2021-11-25 20:44:17,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-11-25 20:44:17,507 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:44:17,507 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:44:17,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-25 20:44:17,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-25 20:44:17,720 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:44:17,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:44:17,720 INFO L85 PathProgramCache]: Analyzing trace with hash -53426268, now seen corresponding path program 54 times [2021-11-25 20:44:17,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:44:17,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133602241] [2021-11-25 20:44:17,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:44:17,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:44:17,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:18,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1503 backedges. 496 proven. 587 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-11-25 20:44:18,424 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:44:18,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133602241] [2021-11-25 20:44:18,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133602241] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:44:18,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867034270] [2021-11-25 20:44:18,425 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:44:18,425 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:18,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:44:18,426 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:44:18,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-25 20:44:18,658 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:44:18,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:44:18,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 20:44:18,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:44:19,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1503 backedges. 551 proven. 532 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-11-25 20:44:19,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:44:20,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1503 backedges. 551 proven. 532 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-11-25 20:44:20,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867034270] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:44:20,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1415644226] [2021-11-25 20:44:20,210 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:44:20,210 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:44:20,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:44:20,210 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:44:20,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:44:20,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:20,281 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:44:20,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:44:20,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:20,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:44:20,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:20,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:44:21,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:21,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:21,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:21,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:21,255 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:44:21,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:44:21,327 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 20 treesize of output 16 [2021-11-25 20:44:21,454 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:44:21,455 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:44:22,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '55874#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:44:22,661 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:44:22,661 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:44:22,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 64 [2021-11-25 20:44:22,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966842789] [2021-11-25 20:44:22,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:44:22,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-25 20:44:22,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:44:22,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-25 20:44:22,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=997, Invalid=4703, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 20:44:22,664 INFO L87 Difference]: Start difference. First operand 167 states and 171 transitions. Second operand has 64 states, 64 states have (on average 2.640625) internal successors, (169), 64 states have internal predecessors, (169), 21 states have call successors, (22), 1 states have call predecessors, (22), 1 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) [2021-11-25 20:44:23,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:44:23,568 INFO L93 Difference]: Finished difference Result 240 states and 245 transitions. [2021-11-25 20:44:23,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-25 20:44:23,569 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.640625) internal successors, (169), 64 states have internal predecessors, (169), 21 states have call successors, (22), 1 states have call predecessors, (22), 1 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) Word has length 165 [2021-11-25 20:44:23,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:44:23,571 INFO L225 Difference]: With dead ends: 240 [2021-11-25 20:44:23,571 INFO L226 Difference]: Without dead ends: 177 [2021-11-25 20:44:23,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 461 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2668 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1643, Invalid=7287, Unknown=0, NotChecked=0, Total=8930 [2021-11-25 20:44:23,573 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 316 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 700 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:44:23,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [317 Valid, 224 Invalid, 700 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:44:23,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-11-25 20:44:23,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 164. [2021-11-25 20:44:23,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 states have internal predecessors, (123), 22 states have call successors, (22), 20 states have call predecessors, (22), 20 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-25 20:44:23,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 167 transitions. [2021-11-25 20:44:23,694 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 167 transitions. Word has length 165 [2021-11-25 20:44:23,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:44:23,694 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 167 transitions. [2021-11-25 20:44:23,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.640625) internal successors, (169), 64 states have internal predecessors, (169), 21 states have call successors, (22), 1 states have call predecessors, (22), 1 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) [2021-11-25 20:44:23,695 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 167 transitions. [2021-11-25 20:44:23,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-25 20:44:23,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:44:23,697 INFO L514 BasicCegarLoop]: trace histogram [22, 20, 20, 20, 20, 19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:44:23,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-25 20:44:23,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-25 20:44:23,915 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:44:23,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:44:23,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1631366749, now seen corresponding path program 55 times [2021-11-25 20:44:23,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:44:23,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802603057] [2021-11-25 20:44:23,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:44:23,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:44:24,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:25,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1547 backedges. 20 proven. 1105 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-25 20:44:25,253 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:44:25,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802603057] [2021-11-25 20:44:25,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802603057] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:44:25,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114783856] [2021-11-25 20:44:25,253 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:44:25,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:25,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:44:25,254 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:44:25,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-25 20:44:25,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:25,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-25 20:44:25,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:44:27,258 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 20:44:27,465 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:44:27,466 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 25 treesize of output 24 [2021-11-25 20:44:28,782 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 19 treesize of output 7 [2021-11-25 20:44:28,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1547 backedges. 60 proven. 1105 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-25 20:44:28,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:44:29,292 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 23 treesize of output 21 [2021-11-25 20:44:29,296 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 39 treesize of output 35 [2021-11-25 20:44:30,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1547 backedges. 20 proven. 1105 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-25 20:44:30,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2114783856] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:44:30,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1026691735] [2021-11-25 20:44:30,088 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:44:30,088 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:44:30,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:44:30,089 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:44:30,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:44:30,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:30,160 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:44:30,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:44:30,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:30,195 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:44:30,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:44:30,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:30,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:44:31,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:31,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:31,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:31,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:31,132 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:44:31,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:44:31,256 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 20 treesize of output 16 [2021-11-25 20:44:31,412 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:44:31,414 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:44:33,343 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57603#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:44:33,344 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:44:33,344 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:44:33,344 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 46] total 91 [2021-11-25 20:44:33,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924366824] [2021-11-25 20:44:33,344 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:44:33,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-25 20:44:33,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:44:33,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-25 20:44:33,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=10099, Unknown=0, NotChecked=0, Total=10506 [2021-11-25 20:44:33,346 INFO L87 Difference]: Start difference. First operand 164 states and 167 transitions. Second operand has 91 states, 89 states have (on average 2.3146067415730336) internal successors, (206), 86 states have internal predecessors, (206), 42 states have call successors, (43), 2 states have call predecessors, (43), 3 states have return successors, (44), 44 states have call predecessors, (44), 42 states have call successors, (44) [2021-11-25 20:44:37,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:44:37,016 INFO L93 Difference]: Finished difference Result 172 states and 176 transitions. [2021-11-25 20:44:37,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-25 20:44:37,017 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 89 states have (on average 2.3146067415730336) internal successors, (206), 86 states have internal predecessors, (206), 42 states have call successors, (43), 2 states have call predecessors, (43), 3 states have return successors, (44), 44 states have call predecessors, (44), 42 states have call successors, (44) Word has length 167 [2021-11-25 20:44:37,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:44:37,021 INFO L225 Difference]: With dead ends: 172 [2021-11-25 20:44:37,021 INFO L226 Difference]: Without dead ends: 170 [2021-11-25 20:44:37,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 440 SyntacticMatches, 6 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4927 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=595, Invalid=15407, Unknown=0, NotChecked=0, Total=16002 [2021-11-25 20:44:37,023 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 72 mSDsluCounter, 1973 mSDsCounter, 0 mSdLazyCounter, 5362 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 1933 SdHoareTripleChecker+Invalid, 5630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 5362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 104 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:44:37,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 1933 Invalid, 5630 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 5362 Invalid, 0 Unknown, 104 Unchecked, 3.0s Time] [2021-11-25 20:44:37,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-25 20:44:37,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 167. [2021-11-25 20:44:37,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 124 states have (on average 1.0161290322580645) internal successors, (126), 124 states have internal predecessors, (126), 22 states have call successors, (22), 20 states have call predecessors, (22), 20 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-25 20:44:37,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 170 transitions. [2021-11-25 20:44:37,099 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 170 transitions. Word has length 167 [2021-11-25 20:44:37,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:44:37,100 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 170 transitions. [2021-11-25 20:44:37,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 89 states have (on average 2.3146067415730336) internal successors, (206), 86 states have internal predecessors, (206), 42 states have call successors, (43), 2 states have call predecessors, (43), 3 states have return successors, (44), 44 states have call predecessors, (44), 42 states have call successors, (44) [2021-11-25 20:44:37,101 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 170 transitions. [2021-11-25 20:44:37,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-25 20:44:37,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:44:37,102 INFO L514 BasicCegarLoop]: trace histogram [22, 20, 20, 20, 20, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:44:37,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-25 20:44:37,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-25 20:44:37,316 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:44:37,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:44:37,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1808613509, now seen corresponding path program 56 times [2021-11-25 20:44:37,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:44:37,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390655652] [2021-11-25 20:44:37,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:44:37,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:44:37,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:38,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1603 backedges. 21 proven. 1160 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-25 20:44:38,597 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:44:38,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390655652] [2021-11-25 20:44:38,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [390655652] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:44:38,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626700134] [2021-11-25 20:44:38,597 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:44:38,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:38,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:44:38,598 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:44:38,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-25 20:44:41,479 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-25 20:44:41,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:44:41,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-25 20:44:41,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:44:43,397 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 20:44:45,164 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 19 treesize of output 7 [2021-11-25 20:44:45,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1603 backedges. 21 proven. 1160 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-25 20:44:45,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:44:47,174 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 16 treesize of output 14 [2021-11-25 20:44:47,177 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 32 treesize of output 28 [2021-11-25 20:44:49,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1603 backedges. 21 proven. 1160 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-25 20:44:49,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626700134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:44:49,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1029865137] [2021-11-25 20:44:49,509 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:44:49,509 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:44:49,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:44:49,510 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:44:49,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:44:49,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:49,606 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:44:49,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:44:49,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:49,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:44:49,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:49,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:44:50,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:50,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:50,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:50,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:50,607 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:44:50,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:44:50,674 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 20 treesize of output 16 [2021-11-25 20:44:50,793 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:44:50,794 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:44:52,814 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '59317#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:44:52,814 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:44:52,814 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:44:52,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 133 [2021-11-25 20:44:52,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412337902] [2021-11-25 20:44:52,815 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:44:52,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-25 20:44:52,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:44:52,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-25 20:44:52,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1684, Invalid=19196, Unknown=0, NotChecked=0, Total=20880 [2021-11-25 20:44:52,817 INFO L87 Difference]: Start difference. First operand 167 states and 170 transitions. Second operand has 133 states, 132 states have (on average 2.3257575757575757) internal successors, (307), 128 states have internal predecessors, (307), 61 states have call successors, (62), 1 states have call predecessors, (62), 2 states have return successors, (63), 63 states have call predecessors, (63), 61 states have call successors, (63) [2021-11-25 20:45:06,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:45:06,454 INFO L93 Difference]: Finished difference Result 306 states and 332 transitions. [2021-11-25 20:45:06,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-11-25 20:45:06,455 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 132 states have (on average 2.3257575757575757) internal successors, (307), 128 states have internal predecessors, (307), 61 states have call successors, (62), 1 states have call predecessors, (62), 2 states have return successors, (63), 63 states have call predecessors, (63), 61 states have call successors, (63) Word has length 170 [2021-11-25 20:45:06,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:45:06,457 INFO L225 Difference]: With dead ends: 306 [2021-11-25 20:45:06,457 INFO L226 Difference]: Without dead ends: 304 [2021-11-25 20:45:06,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 661 GetRequests, 412 SyntacticMatches, 1 SemanticMatches, 248 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19720 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=5190, Invalid=57060, Unknown=0, NotChecked=0, Total=62250 [2021-11-25 20:45:06,463 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 385 mSDsluCounter, 2190 mSDsCounter, 0 mSdLazyCounter, 6060 mSolverCounterSat, 683 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 387 SdHoareTripleChecker+Valid, 2196 SdHoareTripleChecker+Invalid, 6743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 683 IncrementalHoareTripleChecker+Valid, 6060 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:45:06,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [387 Valid, 2196 Invalid, 6743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [683 Valid, 6060 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2021-11-25 20:45:06,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-11-25 20:45:06,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 233. [2021-11-25 20:45:06,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 189 states have (on average 1.0158730158730158) internal successors, (192), 189 states have internal predecessors, (192), 23 states have call successors, (23), 20 states have call predecessors, (23), 20 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-25 20:45:06,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 238 transitions. [2021-11-25 20:45:06,640 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 238 transitions. Word has length 170 [2021-11-25 20:45:06,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:45:06,640 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 238 transitions. [2021-11-25 20:45:06,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 132 states have (on average 2.3257575757575757) internal successors, (307), 128 states have internal predecessors, (307), 61 states have call successors, (62), 1 states have call predecessors, (62), 2 states have return successors, (63), 63 states have call predecessors, (63), 61 states have call successors, (63) [2021-11-25 20:45:06,641 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 238 transitions. [2021-11-25 20:45:06,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-11-25 20:45:06,643 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:45:06,643 INFO L514 BasicCegarLoop]: trace histogram [23, 21, 21, 21, 21, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:45:06,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-25 20:45:06,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:06,859 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:45:06,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:45:06,860 INFO L85 PathProgramCache]: Analyzing trace with hash 1070476356, now seen corresponding path program 57 times [2021-11-25 20:45:06,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:45:06,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595145762] [2021-11-25 20:45:06,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:45:06,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:45:06,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:08,158 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 21 proven. 1223 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-11-25 20:45:08,159 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:45:08,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595145762] [2021-11-25 20:45:08,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595145762] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:45:08,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658932589] [2021-11-25 20:45:08,159 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:45:08,160 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:08,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:45:08,180 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:45:08,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-25 20:45:08,778 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:45:08,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:45:08,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 661 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-25 20:45:08,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:45:10,547 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 20:45:10,757 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:45:10,758 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 25 treesize of output 24 [2021-11-25 20:45:12,187 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 19 treesize of output 7 [2021-11-25 20:45:12,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 63 proven. 1223 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-25 20:45:12,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:45:12,626 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 23 treesize of output 21 [2021-11-25 20:45:12,629 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 39 treesize of output 35 [2021-11-25 20:45:13,257 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 21 proven. 1223 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-11-25 20:45:13,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658932589] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:45:13,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [637064548] [2021-11-25 20:45:13,259 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:45:13,259 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:45:13,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:45:13,259 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:45:13,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:45:13,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:13,331 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:45:13,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:45:13,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:13,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:45:13,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:13,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:45:14,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:14,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:14,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:14,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:14,313 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:45:14,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:45:14,392 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 20 treesize of output 16 [2021-11-25 20:45:14,530 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:45:14,531 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:45:16,346 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '61450#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:45:16,346 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:45:16,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:45:16,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 49, 48] total 93 [2021-11-25 20:45:16,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114908172] [2021-11-25 20:45:16,347 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:45:16,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-11-25 20:45:16,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:45:16,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-11-25 20:45:16,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=10506, Unknown=0, NotChecked=0, Total=10920 [2021-11-25 20:45:16,348 INFO L87 Difference]: Start difference. First operand 233 states and 238 transitions. Second operand has 93 states, 92 states have (on average 2.3260869565217392) internal successors, (214), 89 states have internal predecessors, (214), 43 states have call successors, (44), 2 states have call predecessors, (44), 3 states have return successors, (45), 45 states have call predecessors, (45), 43 states have call successors, (45) [2021-11-25 20:45:21,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:45:21,978 INFO L93 Difference]: Finished difference Result 304 states and 309 transitions. [2021-11-25 20:45:21,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-25 20:45:21,979 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 92 states have (on average 2.3260869565217392) internal successors, (214), 89 states have internal predecessors, (214), 43 states have call successors, (44), 2 states have call predecessors, (44), 3 states have return successors, (45), 45 states have call predecessors, (45), 43 states have call successors, (45) Word has length 175 [2021-11-25 20:45:21,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:45:21,981 INFO L225 Difference]: With dead ends: 304 [2021-11-25 20:45:21,981 INFO L226 Difference]: Without dead ends: 302 [2021-11-25 20:45:21,983 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 640 GetRequests, 464 SyntacticMatches, 6 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9065 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=1137, Invalid=28275, Unknown=0, NotChecked=0, Total=29412 [2021-11-25 20:45:21,983 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 169 mSDsluCounter, 2449 mSDsCounter, 0 mSdLazyCounter, 6855 mSolverCounterSat, 372 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 2421 SdHoareTripleChecker+Invalid, 7332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 372 IncrementalHoareTripleChecker+Valid, 6855 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:45:21,983 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 2421 Invalid, 7332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [372 Valid, 6855 Invalid, 0 Unknown, 105 Unchecked, 3.3s Time] [2021-11-25 20:45:21,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-11-25 20:45:22,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 235. [2021-11-25 20:45:22,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 190 states have (on average 1.0157894736842106) internal successors, (193), 190 states have internal predecessors, (193), 23 states have call successors, (23), 21 states have call predecessors, (23), 21 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-25 20:45:22,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 239 transitions. [2021-11-25 20:45:22,166 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 239 transitions. Word has length 175 [2021-11-25 20:45:22,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:45:22,166 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 239 transitions. [2021-11-25 20:45:22,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 92 states have (on average 2.3260869565217392) internal successors, (214), 89 states have internal predecessors, (214), 43 states have call successors, (44), 2 states have call predecessors, (44), 3 states have return successors, (45), 45 states have call predecessors, (45), 43 states have call successors, (45) [2021-11-25 20:45:22,167 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 239 transitions. [2021-11-25 20:45:22,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-25 20:45:22,168 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:45:22,169 INFO L514 BasicCegarLoop]: trace histogram [23, 21, 21, 21, 21, 21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:45:22,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-25 20:45:22,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:22,380 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:45:22,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:45:22,380 INFO L85 PathProgramCache]: Analyzing trace with hash 434460228, now seen corresponding path program 58 times [2021-11-25 20:45:22,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:45:22,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167638280] [2021-11-25 20:45:22,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:45:22,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:45:22,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:23,822 INFO L134 CoverageAnalysis]: Checked inductivity of 1767 backedges. 22 proven. 1281 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-11-25 20:45:23,822 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:45:23,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167638280] [2021-11-25 20:45:23,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1167638280] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:45:23,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250248889] [2021-11-25 20:45:23,823 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:45:23,823 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:23,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:45:23,824 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:45:23,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-25 20:45:24,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:24,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 671 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-25 20:45:24,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:45:26,020 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 20:45:27,569 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 19 treesize of output 7 [2021-11-25 20:45:27,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1767 backedges. 22 proven. 1281 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-11-25 20:45:27,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:45:27,926 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 16 treesize of output 14 [2021-11-25 20:45:27,928 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 32 treesize of output 28 [2021-11-25 20:45:28,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1767 backedges. 22 proven. 1281 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-11-25 20:45:28,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250248889] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:45:28,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [674798363] [2021-11-25 20:45:28,566 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:45:28,566 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:45:28,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:45:28,567 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:45:28,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:45:28,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:28,641 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:45:28,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:45:28,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:28,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:45:28,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:28,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:45:29,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:29,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:29,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:29,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:29,634 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:45:29,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:45:29,700 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 20 treesize of output 16 [2021-11-25 20:45:29,825 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:45:29,826 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:45:31,655 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '63529#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:45:31,655 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:45:31,655 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:45:31,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 94 [2021-11-25 20:45:31,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885487514] [2021-11-25 20:45:31,656 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:45:31,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-25 20:45:31,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:45:31,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-25 20:45:31,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=10757, Unknown=0, NotChecked=0, Total=11130 [2021-11-25 20:45:31,658 INFO L87 Difference]: Start difference. First operand 235 states and 239 transitions. Second operand has 94 states, 93 states have (on average 2.3548387096774195) internal successors, (219), 90 states have internal predecessors, (219), 43 states have call successors, (44), 1 states have call predecessors, (44), 2 states have return successors, (45), 45 states have call predecessors, (45), 43 states have call successors, (45) [2021-11-25 20:45:38,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:45:38,852 INFO L93 Difference]: Finished difference Result 376 states and 383 transitions. [2021-11-25 20:45:38,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-11-25 20:45:38,853 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 93 states have (on average 2.3548387096774195) internal successors, (219), 90 states have internal predecessors, (219), 43 states have call successors, (44), 1 states have call predecessors, (44), 2 states have return successors, (45), 45 states have call predecessors, (45), 43 states have call successors, (45) Word has length 178 [2021-11-25 20:45:38,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:45:38,855 INFO L225 Difference]: With dead ends: 376 [2021-11-25 20:45:38,855 INFO L226 Difference]: Without dead ends: 374 [2021-11-25 20:45:38,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 474 SyntacticMatches, 4 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8476 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=1100, Invalid=28656, Unknown=0, NotChecked=0, Total=29756 [2021-11-25 20:45:38,857 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 151 mSDsluCounter, 3775 mSDsCounter, 0 mSdLazyCounter, 9579 mSolverCounterSat, 283 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 3795 SdHoareTripleChecker+Invalid, 9862 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 283 IncrementalHoareTripleChecker+Valid, 9579 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:45:38,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 3795 Invalid, 9862 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [283 Valid, 9579 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2021-11-25 20:45:38,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-11-25 20:45:38,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 238. [2021-11-25 20:45:38,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 192 states have (on average 1.0208333333333333) internal successors, (196), 192 states have internal predecessors, (196), 24 states have call successors, (24), 21 states have call predecessors, (24), 21 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-25 20:45:38,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 244 transitions. [2021-11-25 20:45:38,978 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 244 transitions. Word has length 178 [2021-11-25 20:45:38,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:45:38,979 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 244 transitions. [2021-11-25 20:45:38,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 93 states have (on average 2.3548387096774195) internal successors, (219), 90 states have internal predecessors, (219), 43 states have call successors, (44), 1 states have call predecessors, (44), 2 states have return successors, (45), 45 states have call predecessors, (45), 43 states have call successors, (45) [2021-11-25 20:45:38,980 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 244 transitions. [2021-11-25 20:45:38,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-25 20:45:38,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:45:38,981 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:45:39,052 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-25 20:45:39,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:39,196 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:45:39,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:45:39,197 INFO L85 PathProgramCache]: Analyzing trace with hash -2021266364, now seen corresponding path program 59 times [2021-11-25 20:45:39,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:45:39,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663545644] [2021-11-25 20:45:39,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:45:39,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:45:39,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:40,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1829 backedges. 611 proven. 712 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-11-25 20:45:40,178 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:45:40,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663545644] [2021-11-25 20:45:40,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663545644] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:45:40,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102776643] [2021-11-25 20:45:40,179 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:45:40,179 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:40,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:45:40,181 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:45:40,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-25 20:45:43,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-25 20:45:43,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:45:43,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-25 20:45:43,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:45:44,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1829 backedges. 672 proven. 651 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-11-25 20:45:44,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:45:44,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1829 backedges. 672 proven. 651 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-11-25 20:45:44,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102776643] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:45:44,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [82405232] [2021-11-25 20:45:44,940 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:45:44,940 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:45:44,940 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:45:44,940 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:45:44,940 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:45:44,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:45,008 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:45:45,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:45:45,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:45,045 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:45:45,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:45:45,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:45,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:45:45,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:45,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:45,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:45,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:45,985 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:45:45,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:45:46,090 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 20 treesize of output 16 [2021-11-25 20:45:46,233 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:45:46,235 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:45:47,678 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '65702#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:45:47,678 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:45:47,678 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:45:47,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 70 [2021-11-25 20:45:47,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215156237] [2021-11-25 20:45:47,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:45:47,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-25 20:45:47,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:45:47,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-25 20:45:47,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1179, Invalid=5463, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 20:45:47,681 INFO L87 Difference]: Start difference. First operand 238 states and 244 transitions. Second operand has 70 states, 70 states have (on average 2.642857142857143) internal successors, (185), 70 states have internal predecessors, (185), 23 states have call successors, (24), 1 states have call predecessors, (24), 1 states have return successors, (24), 23 states have call predecessors, (24), 23 states have call successors, (24) [2021-11-25 20:45:49,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:45:49,101 INFO L93 Difference]: Finished difference Result 379 states and 386 transitions. [2021-11-25 20:45:49,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-25 20:45:49,102 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.642857142857143) internal successors, (185), 70 states have internal predecessors, (185), 23 states have call successors, (24), 1 states have call predecessors, (24), 1 states have return successors, (24), 23 states have call predecessors, (24), 23 states have call successors, (24) Word has length 181 [2021-11-25 20:45:49,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:45:49,103 INFO L225 Difference]: With dead ends: 379 [2021-11-25 20:45:49,103 INFO L226 Difference]: Without dead ends: 191 [2021-11-25 20:45:49,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 629 GetRequests, 507 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4387 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2755, Invalid=12497, Unknown=0, NotChecked=0, Total=15252 [2021-11-25 20:45:49,106 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 362 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 236 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 363 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 975 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 236 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:45:49,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [363 Valid, 340 Invalid, 975 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [236 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:45:49,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-25 20:45:49,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 178. [2021-11-25 20:45:49,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 132 states have (on average 1.0151515151515151) internal successors, (134), 132 states have internal predecessors, (134), 24 states have call successors, (24), 21 states have call predecessors, (24), 21 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-25 20:45:49,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 182 transitions. [2021-11-25 20:45:49,226 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 182 transitions. Word has length 181 [2021-11-25 20:45:49,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:45:49,226 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 182 transitions. [2021-11-25 20:45:49,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.642857142857143) internal successors, (185), 70 states have internal predecessors, (185), 23 states have call successors, (24), 1 states have call predecessors, (24), 1 states have return successors, (24), 23 states have call predecessors, (24), 23 states have call successors, (24) [2021-11-25 20:45:49,227 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 182 transitions. [2021-11-25 20:45:49,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2021-11-25 20:45:49,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:45:49,228 INFO L514 BasicCegarLoop]: trace histogram [24, 22, 22, 22, 22, 21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:45:49,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-25 20:45:49,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:49,456 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:45:49,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:45:49,456 INFO L85 PathProgramCache]: Analyzing trace with hash 1591350019, now seen corresponding path program 60 times [2021-11-25 20:45:49,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:45:49,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784689695] [2021-11-25 20:45:49,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:45:49,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:45:49,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:50,897 INFO L134 CoverageAnalysis]: Checked inductivity of 1877 backedges. 22 proven. 1347 refuted. 0 times theorem prover too weak. 508 trivial. 0 not checked. [2021-11-25 20:45:50,897 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:45:50,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784689695] [2021-11-25 20:45:50,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784689695] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:45:50,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419118661] [2021-11-25 20:45:50,898 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:45:50,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:50,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:45:50,899 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:45:50,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-25 20:45:51,611 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:45:51,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:45:51,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-25 20:45:51,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:45:53,546 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 20:45:53,773 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:45:53,774 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 25 treesize of output 24 [2021-11-25 20:45:55,326 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 19 treesize of output 7 [2021-11-25 20:45:55,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1877 backedges. 66 proven. 1347 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-11-25 20:45:55,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:45:55,735 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 23 treesize of output 21 [2021-11-25 20:45:55,738 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 39 treesize of output 35 [2021-11-25 20:45:56,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1877 backedges. 22 proven. 1347 refuted. 0 times theorem prover too weak. 508 trivial. 0 not checked. [2021-11-25 20:45:56,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419118661] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:45:56,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [261839083] [2021-11-25 20:45:56,401 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:45:56,402 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:45:56,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:45:56,402 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:45:56,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:45:56,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:56,471 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:45:56,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:45:56,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:56,507 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:45:56,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:45:56,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:56,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:45:57,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:57,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:57,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:57,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:57,454 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:45:57,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:45:57,600 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 20 treesize of output 16 [2021-11-25 20:45:57,731 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:45:57,733 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:45:59,754 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67788#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:45:59,754 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:45:59,755 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:45:59,755 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 51, 50] total 97 [2021-11-25 20:45:59,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950133786] [2021-11-25 20:45:59,755 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:45:59,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-25 20:45:59,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:45:59,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-25 20:45:59,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=430, Invalid=11342, Unknown=0, NotChecked=0, Total=11772 [2021-11-25 20:45:59,758 INFO L87 Difference]: Start difference. First operand 178 states and 182 transitions. Second operand has 97 states, 96 states have (on average 2.3333333333333335) internal successors, (224), 93 states have internal predecessors, (224), 45 states have call successors, (46), 2 states have call predecessors, (46), 3 states have return successors, (47), 47 states have call predecessors, (47), 45 states have call successors, (47) [2021-11-25 20:46:03,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:46:03,885 INFO L93 Difference]: Finished difference Result 250 states and 256 transitions. [2021-11-25 20:46:03,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-25 20:46:03,886 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 96 states have (on average 2.3333333333333335) internal successors, (224), 93 states have internal predecessors, (224), 45 states have call successors, (46), 2 states have call predecessors, (46), 3 states have return successors, (47), 47 states have call predecessors, (47), 45 states have call successors, (47) Word has length 183 [2021-11-25 20:46:03,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:46:03,888 INFO L225 Difference]: With dead ends: 250 [2021-11-25 20:46:03,889 INFO L226 Difference]: Without dead ends: 248 [2021-11-25 20:46:03,890 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 642 GetRequests, 505 SyntacticMatches, 6 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5362 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=618, Invalid=16938, Unknown=0, NotChecked=0, Total=17556 [2021-11-25 20:46:03,890 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 118 mSDsluCounter, 2150 mSDsCounter, 0 mSdLazyCounter, 7127 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 2143 SdHoareTripleChecker+Invalid, 7371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 7127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 115 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:46:03,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 2143 Invalid, 7371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 7127 Invalid, 0 Unknown, 115 Unchecked, 3.3s Time] [2021-11-25 20:46:03,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-11-25 20:46:03,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 186. [2021-11-25 20:46:03,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 25 states have call successors, (25), 22 states have call predecessors, (25), 22 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-25 20:46:03,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 191 transitions. [2021-11-25 20:46:03,997 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 191 transitions. Word has length 183 [2021-11-25 20:46:03,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:46:03,997 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 191 transitions. [2021-11-25 20:46:03,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 96 states have (on average 2.3333333333333335) internal successors, (224), 93 states have internal predecessors, (224), 45 states have call successors, (46), 2 states have call predecessors, (46), 3 states have return successors, (47), 47 states have call predecessors, (47), 45 states have call successors, (47) [2021-11-25 20:46:03,998 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 191 transitions. [2021-11-25 20:46:03,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2021-11-25 20:46:03,999 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:46:03,999 INFO L514 BasicCegarLoop]: trace histogram [24, 22, 22, 22, 22, 22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:46:04,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-25 20:46:04,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-11-25 20:46:04,216 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:46:04,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:46:04,216 INFO L85 PathProgramCache]: Analyzing trace with hash 64914213, now seen corresponding path program 61 times [2021-11-25 20:46:04,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:46:04,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042753151] [2021-11-25 20:46:04,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:46:04,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:46:04,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:05,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1939 backedges. 23 proven. 1408 refuted. 0 times theorem prover too weak. 508 trivial. 0 not checked. [2021-11-25 20:46:05,671 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:46:05,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042753151] [2021-11-25 20:46:05,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042753151] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:46:05,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2082762882] [2021-11-25 20:46:05,671 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:46:05,672 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:05,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:46:05,674 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:46:05,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-25 20:46:05,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:05,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 700 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-25 20:46:05,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:46:08,039 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 20:46:09,690 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 19 treesize of output 7 [2021-11-25 20:46:09,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1939 backedges. 23 proven. 1408 refuted. 0 times theorem prover too weak. 508 trivial. 0 not checked. [2021-11-25 20:46:09,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:46:10,066 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 16 treesize of output 14 [2021-11-25 20:46:10,069 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 32 treesize of output 28 [2021-11-25 20:46:10,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1939 backedges. 23 proven. 1408 refuted. 0 times theorem prover too weak. 508 trivial. 0 not checked. [2021-11-25 20:46:10,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2082762882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:46:10,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [275615633] [2021-11-25 20:46:10,792 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:46:10,792 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:46:10,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:46:10,793 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:46:10,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:46:10,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:10,860 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:46:10,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:46:10,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:10,928 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:46:10,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:46:11,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:11,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:46:11,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:11,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:11,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:11,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:11,916 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:46:11,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:46:12,062 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 20 treesize of output 16 [2021-11-25 20:46:12,195 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:46:12,197 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:46:14,234 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69720#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:46:14,234 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:46:14,234 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:46:14,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 98 [2021-11-25 20:46:14,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773488739] [2021-11-25 20:46:14,235 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:46:14,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-25 20:46:14,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:46:14,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-25 20:46:14,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=11603, Unknown=0, NotChecked=0, Total=11990 [2021-11-25 20:46:14,237 INFO L87 Difference]: Start difference. First operand 186 states and 191 transitions. Second operand has 98 states, 97 states have (on average 2.3608247422680413) internal successors, (229), 94 states have internal predecessors, (229), 45 states have call successors, (46), 1 states have call predecessors, (46), 2 states have return successors, (47), 47 states have call predecessors, (47), 45 states have call successors, (47) [2021-11-25 20:46:20,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:46:20,922 INFO L93 Difference]: Finished difference Result 270 states and 276 transitions. [2021-11-25 20:46:20,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-11-25 20:46:20,923 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 97 states have (on average 2.3608247422680413) internal successors, (229), 94 states have internal predecessors, (229), 45 states have call successors, (46), 1 states have call predecessors, (46), 2 states have return successors, (47), 47 states have call predecessors, (47), 45 states have call successors, (47) Word has length 186 [2021-11-25 20:46:20,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:46:20,925 INFO L225 Difference]: With dead ends: 270 [2021-11-25 20:46:20,925 INFO L226 Difference]: Without dead ends: 268 [2021-11-25 20:46:20,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 678 GetRequests, 496 SyntacticMatches, 4 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9198 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=1147, Invalid=31073, Unknown=0, NotChecked=0, Total=32220 [2021-11-25 20:46:20,927 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 211 mSDsluCounter, 2793 mSDsCounter, 0 mSdLazyCounter, 8108 mSolverCounterSat, 419 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 2807 SdHoareTripleChecker+Invalid, 8527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 419 IncrementalHoareTripleChecker+Valid, 8108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:46:20,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 2807 Invalid, 8527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [419 Valid, 8108 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2021-11-25 20:46:20,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-25 20:46:21,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 189. [2021-11-25 20:46:21,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 141 states have (on average 1.0212765957446808) internal successors, (144), 141 states have internal predecessors, (144), 25 states have call successors, (25), 22 states have call predecessors, (25), 22 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-25 20:46:21,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 194 transitions. [2021-11-25 20:46:21,057 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 194 transitions. Word has length 186 [2021-11-25 20:46:21,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:46:21,058 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 194 transitions. [2021-11-25 20:46:21,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 97 states have (on average 2.3608247422680413) internal successors, (229), 94 states have internal predecessors, (229), 45 states have call successors, (46), 1 states have call predecessors, (46), 2 states have return successors, (47), 47 states have call predecessors, (47), 45 states have call successors, (47) [2021-11-25 20:46:21,058 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 194 transitions. [2021-11-25 20:46:21,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-25 20:46:21,060 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:46:21,060 INFO L514 BasicCegarLoop]: trace histogram [25, 23, 23, 23, 23, 21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:46:21,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-25 20:46:21,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-11-25 20:46:21,268 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:46:21,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:46:21,268 INFO L85 PathProgramCache]: Analyzing trace with hash 661157284, now seen corresponding path program 62 times [2021-11-25 20:46:21,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:46:21,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065402892] [2021-11-25 20:46:21,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:46:21,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:46:21,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:22,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1992 backedges. 22 proven. 1416 refuted. 0 times theorem prover too weak. 554 trivial. 0 not checked. [2021-11-25 20:46:22,958 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:46:22,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065402892] [2021-11-25 20:46:22,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065402892] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:46:22,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482484153] [2021-11-25 20:46:22,958 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:46:22,959 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:22,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:46:22,960 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:46:22,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-25 20:46:30,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-25 20:46:30,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:46:30,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-25 20:46:30,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:46:32,748 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 20:46:32,898 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:46:32,898 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 25 treesize of output 24 [2021-11-25 20:46:33,159 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:46:33,159 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 25 treesize of output 24 [2021-11-25 20:46:34,690 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 19 treesize of output 7 [2021-11-25 20:46:34,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1992 backedges. 113 proven. 1413 refuted. 0 times theorem prover too weak. 466 trivial. 0 not checked. [2021-11-25 20:46:34,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:46:35,157 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 20 treesize of output 18 [2021-11-25 20:46:35,160 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 36 treesize of output 32 [2021-11-25 20:46:35,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1992 backedges. 22 proven. 1416 refuted. 0 times theorem prover too weak. 554 trivial. 0 not checked. [2021-11-25 20:46:35,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482484153] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:46:35,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [677474968] [2021-11-25 20:46:35,821 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:46:35,821 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:46:35,822 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:46:35,822 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:46:35,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:46:35,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:35,891 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:46:35,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:46:35,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:35,928 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:46:35,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:46:36,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:36,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:46:36,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:36,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:36,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:36,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:36,869 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:46:36,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:46:36,936 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 20 treesize of output 16 [2021-11-25 20:46:37,088 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:46:37,089 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:46:39,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '71764#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:46:39,004 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:46:39,004 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:46:39,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 52, 51] total 98 [2021-11-25 20:46:39,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455843898] [2021-11-25 20:46:39,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:46:39,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-25 20:46:39,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:46:39,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-25 20:46:39,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=436, Invalid=11554, Unknown=0, NotChecked=0, Total=11990 [2021-11-25 20:46:39,007 INFO L87 Difference]: Start difference. First operand 189 states and 194 transitions. Second operand has 98 states, 97 states have (on average 2.3402061855670104) internal successors, (227), 94 states have internal predecessors, (227), 46 states have call successors, (48), 2 states have call predecessors, (48), 3 states have return successors, (49), 48 states have call predecessors, (49), 46 states have call successors, (49) [2021-11-25 20:46:42,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:46:42,990 INFO L93 Difference]: Finished difference Result 261 states and 265 transitions. [2021-11-25 20:46:42,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-25 20:46:42,990 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 97 states have (on average 2.3402061855670104) internal successors, (227), 94 states have internal predecessors, (227), 46 states have call successors, (48), 2 states have call predecessors, (48), 3 states have return successors, (49), 48 states have call predecessors, (49), 46 states have call successors, (49) Word has length 188 [2021-11-25 20:46:42,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:46:42,993 INFO L225 Difference]: With dead ends: 261 [2021-11-25 20:46:42,993 INFO L226 Difference]: Without dead ends: 259 [2021-11-25 20:46:42,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 641 GetRequests, 497 SyntacticMatches, 9 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5940 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=649, Invalid=17983, Unknown=0, NotChecked=0, Total=18632 [2021-11-25 20:46:42,996 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 58 mSDsluCounter, 2078 mSDsCounter, 0 mSdLazyCounter, 6619 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 2040 SdHoareTripleChecker+Invalid, 6865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 6619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 113 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:46:42,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 2040 Invalid, 6865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 6619 Invalid, 0 Unknown, 113 Unchecked, 3.1s Time] [2021-11-25 20:46:42,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-25 20:46:43,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 191. [2021-11-25 20:46:43,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 25 states have call successors, (25), 23 states have call predecessors, (25), 23 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-25 20:46:43,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 195 transitions. [2021-11-25 20:46:43,143 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 195 transitions. Word has length 188 [2021-11-25 20:46:43,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:46:43,144 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 195 transitions. [2021-11-25 20:46:43,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 97 states have (on average 2.3402061855670104) internal successors, (227), 94 states have internal predecessors, (227), 46 states have call successors, (48), 2 states have call predecessors, (48), 3 states have return successors, (49), 48 states have call predecessors, (49), 46 states have call successors, (49) [2021-11-25 20:46:43,145 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 195 transitions. [2021-11-25 20:46:43,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-25 20:46:43,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:46:43,146 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:46:43,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-25 20:46:43,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:43,371 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:46:43,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:46:43,372 INFO L85 PathProgramCache]: Analyzing trace with hash 1129547715, now seen corresponding path program 63 times [2021-11-25 20:46:43,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:46:43,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034860879] [2021-11-25 20:46:43,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:46:43,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:46:43,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:44,460 INFO L134 CoverageAnalysis]: Checked inductivity of 2004 backedges. 673 proven. 779 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2021-11-25 20:46:44,461 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:46:44,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034860879] [2021-11-25 20:46:44,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034860879] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:46:44,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422912142] [2021-11-25 20:46:44,461 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:46:44,461 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:44,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:46:44,463 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:46:44,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-25 20:46:44,847 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:46:44,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:46:44,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-25 20:46:44,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:46:46,392 INFO L134 CoverageAnalysis]: Checked inductivity of 2004 backedges. 737 proven. 715 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2021-11-25 20:46:46,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:46:46,816 INFO L134 CoverageAnalysis]: Checked inductivity of 2004 backedges. 737 proven. 715 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2021-11-25 20:46:46,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422912142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:46:46,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [377972487] [2021-11-25 20:46:46,818 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:46:46,818 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:46:46,818 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:46:46,818 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:46:46,819 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:46:46,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:46,887 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:46:46,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:46:46,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:46,921 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:46:46,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:46:47,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:47,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:46:47,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:47,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:47,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:47,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:47,865 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:46:47,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:46:47,989 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 20 treesize of output 16 [2021-11-25 20:46:48,149 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:46:48,150 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:46:49,342 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '73695#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:46:49,342 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:46:49,342 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:46:49,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 73 [2021-11-25 20:46:49,342 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698811208] [2021-11-25 20:46:49,342 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:46:49,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-25 20:46:49,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:46:49,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-25 20:46:49,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1276, Invalid=5864, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 20:46:49,344 INFO L87 Difference]: Start difference. First operand 191 states and 195 transitions. Second operand has 73 states, 73 states have (on average 2.643835616438356) internal successors, (193), 73 states have internal predecessors, (193), 24 states have call successors, (25), 1 states have call predecessors, (25), 1 states have return successors, (25), 24 states have call predecessors, (25), 24 states have call successors, (25) [2021-11-25 20:46:50,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:46:50,088 INFO L93 Difference]: Finished difference Result 273 states and 278 transitions. [2021-11-25 20:46:50,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-25 20:46:50,089 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.643835616438356) internal successors, (193), 73 states have internal predecessors, (193), 24 states have call successors, (25), 1 states have call predecessors, (25), 1 states have return successors, (25), 24 states have call predecessors, (25), 24 states have call successors, (25) Word has length 189 [2021-11-25 20:46:50,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:46:50,090 INFO L225 Difference]: With dead ends: 273 [2021-11-25 20:46:50,090 INFO L226 Difference]: Without dead ends: 201 [2021-11-25 20:46:50,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 635 GetRequests, 530 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3340 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2123, Invalid=9219, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 20:46:50,091 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 299 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 686 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:46:50,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 303 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 686 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:46:50,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-25 20:46:50,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 188. [2021-11-25 20:46:50,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 139 states have (on average 1.014388489208633) internal successors, (141), 139 states have internal predecessors, (141), 25 states have call successors, (25), 23 states have call predecessors, (25), 23 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-25 20:46:50,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 191 transitions. [2021-11-25 20:46:50,170 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 191 transitions. Word has length 189 [2021-11-25 20:46:50,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:46:50,170 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 191 transitions. [2021-11-25 20:46:50,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.643835616438356) internal successors, (193), 73 states have internal predecessors, (193), 24 states have call successors, (25), 1 states have call predecessors, (25), 1 states have return successors, (25), 24 states have call predecessors, (25), 24 states have call successors, (25) [2021-11-25 20:46:50,170 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 191 transitions. [2021-11-25 20:46:50,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-11-25 20:46:50,171 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:46:50,171 INFO L514 BasicCegarLoop]: trace histogram [25, 23, 23, 23, 23, 22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:46:50,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-25 20:46:50,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:50,375 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:46:50,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:46:50,376 INFO L85 PathProgramCache]: Analyzing trace with hash -177860380, now seen corresponding path program 64 times [2021-11-25 20:46:50,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:46:50,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061329575] [2021-11-25 20:46:50,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:46:50,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:46:50,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:51,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 23 proven. 1477 refuted. 0 times theorem prover too weak. 554 trivial. 0 not checked. [2021-11-25 20:46:51,648 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:46:51,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061329575] [2021-11-25 20:46:51,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2061329575] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:46:51,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1400000985] [2021-11-25 20:46:51,649 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:46:51,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:51,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:46:51,649 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:46:51,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-25 20:46:51,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:51,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 719 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-25 20:46:51,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:46:53,598 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 20:46:53,782 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:46:53,782 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 25 treesize of output 24 [2021-11-25 20:46:55,127 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 19 treesize of output 7 [2021-11-25 20:46:55,184 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 69 proven. 1477 refuted. 0 times theorem prover too weak. 508 trivial. 0 not checked. [2021-11-25 20:46:55,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:46:55,465 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 23 treesize of output 21 [2021-11-25 20:46:55,467 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 39 treesize of output 35 [2021-11-25 20:46:56,022 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 23 proven. 1477 refuted. 0 times theorem prover too weak. 554 trivial. 0 not checked. [2021-11-25 20:46:56,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1400000985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:46:56,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [325793776] [2021-11-25 20:46:56,023 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:46:56,023 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:46:56,023 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:46:56,023 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:46:56,023 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:46:56,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:56,079 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:46:56,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:46:56,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:56,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:46:56,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:56,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:46:56,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:56,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:56,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:56,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:56,833 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:46:56,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:46:56,932 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 20 treesize of output 16 [2021-11-25 20:46:57,038 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:46:57,039 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:46:58,660 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '75668#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:46:58,661 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:46:58,661 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:46:58,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 53, 52] total 101 [2021-11-25 20:46:58,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782106501] [2021-11-25 20:46:58,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:46:58,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-25 20:46:58,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:46:58,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-25 20:46:58,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=12210, Unknown=0, NotChecked=0, Total=12656 [2021-11-25 20:46:58,663 INFO L87 Difference]: Start difference. First operand 188 states and 191 transitions. Second operand has 101 states, 100 states have (on average 2.34) internal successors, (234), 97 states have internal predecessors, (234), 47 states have call successors, (48), 2 states have call predecessors, (48), 3 states have return successors, (49), 49 states have call predecessors, (49), 47 states have call successors, (49) [2021-11-25 20:47:01,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:47:01,357 INFO L93 Difference]: Finished difference Result 196 states and 200 transitions. [2021-11-25 20:47:01,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-25 20:47:01,357 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 100 states have (on average 2.34) internal successors, (234), 97 states have internal predecessors, (234), 47 states have call successors, (48), 2 states have call predecessors, (48), 3 states have return successors, (49), 49 states have call predecessors, (49), 47 states have call successors, (49) Word has length 191 [2021-11-25 20:47:01,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:47:01,358 INFO L225 Difference]: With dead ends: 196 [2021-11-25 20:47:01,358 INFO L226 Difference]: Without dead ends: 194 [2021-11-25 20:47:01,359 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 670 GetRequests, 528 SyntacticMatches, 6 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5775 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=639, Invalid=18267, Unknown=0, NotChecked=0, Total=18906 [2021-11-25 20:47:01,359 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 122 mSDsluCounter, 1656 mSDsCounter, 0 mSdLazyCounter, 5533 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 1645 SdHoareTripleChecker+Invalid, 5818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 5533 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 151 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:47:01,360 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 1645 Invalid, 5818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 5533 Invalid, 0 Unknown, 151 Unchecked, 2.1s Time] [2021-11-25 20:47:01,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-25 20:47:01,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 191. [2021-11-25 20:47:01,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 142 states have (on average 1.0140845070422535) internal successors, (144), 142 states have internal predecessors, (144), 25 states have call successors, (25), 23 states have call predecessors, (25), 23 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-25 20:47:01,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 194 transitions. [2021-11-25 20:47:01,428 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 194 transitions. Word has length 191 [2021-11-25 20:47:01,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:47:01,428 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 194 transitions. [2021-11-25 20:47:01,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 100 states have (on average 2.34) internal successors, (234), 97 states have internal predecessors, (234), 47 states have call successors, (48), 2 states have call predecessors, (48), 3 states have return successors, (49), 49 states have call predecessors, (49), 47 states have call successors, (49) [2021-11-25 20:47:01,428 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 194 transitions. [2021-11-25 20:47:01,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-11-25 20:47:01,429 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:47:01,430 INFO L514 BasicCegarLoop]: trace histogram [25, 23, 23, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:47:01,471 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2021-11-25 20:47:01,654 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-25 20:47:01,655 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:47:01,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:47:01,656 INFO L85 PathProgramCache]: Analyzing trace with hash 1356574116, now seen corresponding path program 65 times [2021-11-25 20:47:01,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:47:01,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716066583] [2021-11-25 20:47:01,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:47:01,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:47:01,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:47:03,020 INFO L134 CoverageAnalysis]: Checked inductivity of 2119 backedges. 24 proven. 1541 refuted. 0 times theorem prover too weak. 554 trivial. 0 not checked. [2021-11-25 20:47:03,020 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:47:03,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716066583] [2021-11-25 20:47:03,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716066583] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:47:03,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58553273] [2021-11-25 20:47:03,021 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:47:03,021 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:03,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:47:03,023 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:47:03,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-25 20:47:07,525 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-25 20:47:07,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:47:07,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 729 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-25 20:47:07,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:47:09,388 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 15 treesize of output 11 [2021-11-25 20:47:11,663 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-25 20:47:11,664 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 25 treesize of output 12 [2021-11-25 20:47:11,724 INFO L134 CoverageAnalysis]: Checked inductivity of 2119 backedges. 739 proven. 826 refuted. 0 times theorem prover too weak. 554 trivial. 0 not checked. [2021-11-25 20:47:11,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:47:14,354 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 20 treesize of output 18 [2021-11-25 20:47:14,357 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 42 treesize of output 36 [2021-11-25 20:47:16,914 INFO L134 CoverageAnalysis]: Checked inductivity of 2119 backedges. 717 proven. 848 refuted. 0 times theorem prover too weak. 554 trivial. 0 not checked. [2021-11-25 20:47:16,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58553273] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:47:16,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1384640751] [2021-11-25 20:47:16,915 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:47:16,915 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:47:16,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:47:16,915 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:47:16,915 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:47:16,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:16,970 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:47:16,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:47:16,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:16,998 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:47:16,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:47:17,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:17,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:47:17,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:17,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:17,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:17,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:17,751 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-25 20:47:17,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 340 treesize of output 325 [2021-11-25 20:47:17,849 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 20 treesize of output 16 [2021-11-25 20:47:17,966 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2021-11-25 20:47:17,968 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:47:19,807 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '77640#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |#NULL.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|))' at error location [2021-11-25 20:47:19,807 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:47:19,807 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:47:19,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 152 [2021-11-25 20:47:19,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926430661] [2021-11-25 20:47:19,808 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:47:19,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2021-11-25 20:47:19,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:47:19,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-11-25 20:47:19,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2419, Invalid=24313, Unknown=0, NotChecked=0, Total=26732 [2021-11-25 20:47:19,811 INFO L87 Difference]: Start difference. First operand 191 states and 194 transitions. Second operand has 152 states, 150 states have (on average 2.3466666666666667) internal successors, (352), 147 states have internal predecessors, (352), 70 states have call successors, (71), 1 states have call predecessors, (71), 2 states have return successors, (72), 72 states have call predecessors, (72), 70 states have call successors, (72) [2021-11-25 20:47:26,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:47:26,722 INFO L93 Difference]: Finished difference Result 266 states and 271 transitions. [2021-11-25 20:47:26,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-11-25 20:47:26,722 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 150 states have (on average 2.3466666666666667) internal successors, (352), 147 states have internal predecessors, (352), 70 states have call successors, (71), 1 states have call predecessors, (71), 2 states have return successors, (72), 72 states have call predecessors, (72), 70 states have call successors, (72) Word has length 194 [2021-11-25 20:47:26,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:47:26,723 INFO L225 Difference]: With dead ends: 266 [2021-11-25 20:47:26,723 INFO L226 Difference]: Without dead ends: 194 [2021-11-25 20:47:26,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 751 GetRequests, 495 SyntacticMatches, 1 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19553 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=5344, Invalid=60448, Unknown=0, NotChecked=0, Total=65792 [2021-11-25 20:47:26,727 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 6 mSDsluCounter, 2096 mSDsCounter, 0 mSdLazyCounter, 2428 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 2103 SdHoareTripleChecker+Invalid, 2750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 2428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 244 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:47:26,727 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 2103 Invalid, 2750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 2428 Invalid, 0 Unknown, 244 Unchecked, 1.1s Time] [2021-11-25 20:47:26,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-25 20:47:26,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2021-11-25 20:47:26,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 144 states have (on average 1.0138888888888888) internal successors, (146), 144 states have internal predecessors, (146), 26 states have call successors, (26), 23 states have call predecessors, (26), 23 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-25 20:47:26,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 198 transitions. [2021-11-25 20:47:26,816 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 198 transitions. Word has length 194 [2021-11-25 20:47:26,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:47:26,816 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 198 transitions. [2021-11-25 20:47:26,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 150 states have (on average 2.3466666666666667) internal successors, (352), 147 states have internal predecessors, (352), 70 states have call successors, (71), 1 states have call predecessors, (71), 2 states have return successors, (72), 72 states have call predecessors, (72), 70 states have call successors, (72) [2021-11-25 20:47:26,817 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 198 transitions. [2021-11-25 20:47:26,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-11-25 20:47:26,818 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:47:26,818 INFO L514 BasicCegarLoop]: trace histogram [26, 24, 24, 24, 24, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:47:26,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-25 20:47:27,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-25 20:47:27,060 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:47:27,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:47:27,060 INFO L85 PathProgramCache]: Analyzing trace with hash 462752867, now seen corresponding path program 66 times [2021-11-25 20:47:27,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:47:27,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261884616] [2021-11-25 20:47:27,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:47:27,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:47:27,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:47:28,432 INFO L134 CoverageAnalysis]: Checked inductivity of 2239 backedges. 24 proven. 1613 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2021-11-25 20:47:28,432 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:47:28,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261884616] [2021-11-25 20:47:28,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [261884616] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:47:28,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851056239] [2021-11-25 20:47:28,433 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:47:28,433 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:28,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:47:28,433 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:47:28,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-25 20:47:29,180 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:47:29,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:47:29,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 748 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-25 20:47:29,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:47:30,949 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 20:47:31,138 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 20:47:31,138 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 25 treesize of output 24 [2021-11-25 20:47:32,576 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 19 treesize of output 7 [2021-11-25 20:47:32,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2239 backedges. 72 proven. 1613 refuted. 0 times theorem prover too weak. 554 trivial. 0 not checked. [2021-11-25 20:47:32,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:47:32,923 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 23 treesize of output 21 [2021-11-25 20:47:32,925 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 39 treesize of output 35 [2021-11-25 20:47:33,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2239 backedges. 24 proven. 1613 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2021-11-25 20:47:33,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851056239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:47:33,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1734343292] [2021-11-25 20:47:33,515 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:47:33,515 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:47:33,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:47:33,515 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:47:33,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:47:33,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:33,571 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:47:33,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:47:33,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:33,597 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:47:33,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:47:33,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:33,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:47:34,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:34,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:34,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:34,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:34,351 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:47:34,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:47:34,401 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 20 treesize of output 16 [2021-11-25 20:47:34,532 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:47:34,534 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:47:36,158 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '79832#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:47:36,158 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:47:36,158 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:47:36,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 55, 54] total 105 [2021-11-25 20:47:36,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175089581] [2021-11-25 20:47:36,158 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:47:36,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-25 20:47:36,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:47:36,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-25 20:47:36,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=13110, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 20:47:36,160 INFO L87 Difference]: Start difference. First operand 194 states and 198 transitions. Second operand has 105 states, 104 states have (on average 2.3461538461538463) internal successors, (244), 101 states have internal predecessors, (244), 49 states have call successors, (50), 2 states have call predecessors, (50), 3 states have return successors, (51), 51 states have call predecessors, (51), 49 states have call successors, (51) [2021-11-25 20:47:39,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:47:39,310 INFO L93 Difference]: Finished difference Result 204 states and 208 transitions. [2021-11-25 20:47:39,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-25 20:47:39,311 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 104 states have (on average 2.3461538461538463) internal successors, (244), 101 states have internal predecessors, (244), 49 states have call successors, (50), 2 states have call predecessors, (50), 3 states have return successors, (51), 51 states have call predecessors, (51), 49 states have call successors, (51) Word has length 199 [2021-11-25 20:47:39,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:47:39,312 INFO L225 Difference]: With dead ends: 204 [2021-11-25 20:47:39,312 INFO L226 Difference]: Without dead ends: 202 [2021-11-25 20:47:39,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 551 SyntacticMatches, 6 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6093 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=657, Invalid=19365, Unknown=0, NotChecked=0, Total=20022 [2021-11-25 20:47:39,313 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 78 mSDsluCounter, 2818 mSDsCounter, 0 mSdLazyCounter, 6890 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 2816 SdHoareTripleChecker+Invalid, 7107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 6890 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:47:39,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 2816 Invalid, 7107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 6890 Invalid, 0 Unknown, 124 Unchecked, 2.5s Time] [2021-11-25 20:47:39,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-25 20:47:39,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 199. [2021-11-25 20:47:39,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 148 states have (on average 1.0135135135135136) internal successors, (150), 148 states have internal predecessors, (150), 26 states have call successors, (26), 24 states have call predecessors, (26), 24 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-25 20:47:39,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 202 transitions. [2021-11-25 20:47:39,429 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 202 transitions. Word has length 199 [2021-11-25 20:47:39,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:47:39,429 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 202 transitions. [2021-11-25 20:47:39,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 104 states have (on average 2.3461538461538463) internal successors, (244), 101 states have internal predecessors, (244), 49 states have call successors, (50), 2 states have call predecessors, (50), 3 states have return successors, (51), 51 states have call predecessors, (51), 49 states have call successors, (51) [2021-11-25 20:47:39,429 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 202 transitions. [2021-11-25 20:47:39,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2021-11-25 20:47:39,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:47:39,431 INFO L514 BasicCegarLoop]: trace histogram [26, 24, 24, 24, 24, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:47:39,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-25 20:47:39,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-25 20:47:39,647 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:47:39,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:47:39,648 INFO L85 PathProgramCache]: Analyzing trace with hash -968847931, now seen corresponding path program 67 times [2021-11-25 20:47:39,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:47:39,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895521335] [2021-11-25 20:47:39,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:47:39,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:47:39,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:47:41,009 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 25 proven. 1680 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2021-11-25 20:47:41,009 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:47:41,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895521335] [2021-11-25 20:47:41,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895521335] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:47:41,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964017181] [2021-11-25 20:47:41,009 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:47:41,009 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:41,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:47:41,010 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:47:41,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-25 20:47:41,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:47:41,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 758 conjuncts, 113 conjunts are in the unsatisfiable core [2021-11-25 20:47:41,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:47:43,142 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 20:47:44,687 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 19 treesize of output 7 [2021-11-25 20:47:44,746 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 25 proven. 1680 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2021-11-25 20:47:44,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:47:45,039 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 16 treesize of output 14 [2021-11-25 20:47:45,042 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 32 treesize of output 28 [2021-11-25 20:47:45,605 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 25 proven. 1680 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2021-11-25 20:47:45,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964017181] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:47:45,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [618115677] [2021-11-25 20:47:45,606 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:47:45,606 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:47:45,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:47:45,607 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:47:45,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:47:45,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:45,663 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:47:45,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:47:45,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:45,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:47:45,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:45,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:47:46,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:46,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:46,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:46,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:46,440 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:47:46,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:47:46,522 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 20 treesize of output 16 [2021-11-25 20:47:46,641 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:47:46,642 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:47:48,268 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '81831#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:47:48,268 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:47:48,268 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:47:48,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 106 [2021-11-25 20:47:48,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954473901] [2021-11-25 20:47:48,269 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:47:48,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-25 20:47:48,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:47:48,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-25 20:47:48,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=13391, Unknown=0, NotChecked=0, Total=13806 [2021-11-25 20:47:48,270 INFO L87 Difference]: Start difference. First operand 199 states and 202 transitions. Second operand has 106 states, 105 states have (on average 2.3714285714285714) internal successors, (249), 102 states have internal predecessors, (249), 49 states have call successors, (50), 1 states have call predecessors, (50), 2 states have return successors, (51), 51 states have call predecessors, (51), 49 states have call successors, (51) [2021-11-25 20:47:54,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:47:54,618 INFO L93 Difference]: Finished difference Result 290 states and 296 transitions. [2021-11-25 20:47:54,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-11-25 20:47:54,618 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 105 states have (on average 2.3714285714285714) internal successors, (249), 102 states have internal predecessors, (249), 49 states have call successors, (50), 1 states have call predecessors, (50), 2 states have return successors, (51), 51 states have call predecessors, (51), 49 states have call successors, (51) Word has length 202 [2021-11-25 20:47:54,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:47:54,619 INFO L225 Difference]: With dead ends: 290 [2021-11-25 20:47:54,619 INFO L226 Difference]: Without dead ends: 288 [2021-11-25 20:47:54,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 736 GetRequests, 540 SyntacticMatches, 4 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10717 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=1241, Invalid=36201, Unknown=0, NotChecked=0, Total=37442 [2021-11-25 20:47:54,622 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 189 mSDsluCounter, 3473 mSDsCounter, 0 mSdLazyCounter, 9645 mSolverCounterSat, 421 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 3468 SdHoareTripleChecker+Invalid, 10066 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 421 IncrementalHoareTripleChecker+Valid, 9645 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:47:54,622 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 3468 Invalid, 10066 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [421 Valid, 9645 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2021-11-25 20:47:54,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-11-25 20:47:54,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 205. [2021-11-25 20:47:54,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 153 states have (on average 1.0196078431372548) internal successors, (156), 153 states have internal predecessors, (156), 27 states have call successors, (27), 24 states have call predecessors, (27), 24 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-25 20:47:54,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 210 transitions. [2021-11-25 20:47:54,705 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 210 transitions. Word has length 202 [2021-11-25 20:47:54,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:47:54,705 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 210 transitions. [2021-11-25 20:47:54,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 105 states have (on average 2.3714285714285714) internal successors, (249), 102 states have internal predecessors, (249), 49 states have call successors, (50), 1 states have call predecessors, (50), 2 states have return successors, (51), 51 states have call predecessors, (51), 49 states have call successors, (51) [2021-11-25 20:47:54,705 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 210 transitions. [2021-11-25 20:47:54,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-11-25 20:47:54,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:47:54,706 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:47:54,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-25 20:47:54,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:54,931 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:47:54,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:47:54,932 INFO L85 PathProgramCache]: Analyzing trace with hash -762971869, now seen corresponding path program 68 times [2021-11-25 20:47:54,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:47:54,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036397896] [2021-11-25 20:47:54,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:47:54,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:47:54,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:47:55,727 INFO L134 CoverageAnalysis]: Checked inductivity of 2378 backedges. 806 proven. 922 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-11-25 20:47:55,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:47:55,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036397896] [2021-11-25 20:47:55,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2036397896] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:47:55,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559585298] [2021-11-25 20:47:55,728 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:47:55,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:55,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:47:55,728 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:47:55,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-25 20:48:01,617 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-11-25 20:48:01,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:48:01,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 768 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 20:48:01,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:48:02,903 INFO L134 CoverageAnalysis]: Checked inductivity of 2378 backedges. 876 proven. 852 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-11-25 20:48:02,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:48:03,260 INFO L134 CoverageAnalysis]: Checked inductivity of 2378 backedges. 876 proven. 852 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-11-25 20:48:03,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559585298] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:48:03,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [285068376] [2021-11-25 20:48:03,261 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 20:48:03,261 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:48:03,262 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:48:03,262 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:48:03,262 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:48:03,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:48:03,318 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:48:03,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:48:03,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:48:03,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:48:03,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:48:03,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 20:48:04,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:48:04,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:48:04,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:48:04,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:48:04,067 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 20:48:04,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 325 [2021-11-25 20:48:04,118 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 20 treesize of output 16 [2021-11-25 20:48:04,218 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 20:48:04,219 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:48:05,311 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '84024#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~j~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (ite (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_#t~mem9#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 2147483647) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem9#1|) (= |#NULL.base| 0))' at error location [2021-11-25 20:48:05,311 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:48:05,311 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:48:05,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2021-11-25 20:48:05,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721492157] [2021-11-25 20:48:05,311 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:48:05,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-25 20:48:05,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:48:05,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-25 20:48:05,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1482, Invalid=6708, Unknown=0, NotChecked=0, Total=8190 [2021-11-25 20:48:05,313 INFO L87 Difference]: Start difference. First operand 205 states and 210 transitions. Second operand has 79 states, 79 states have (on average 2.6455696202531644) internal successors, (209), 79 states have internal predecessors, (209), 26 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 26 states have call predecessors, (27), 26 states have call successors, (27) [2021-11-25 20:48:06,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:48:06,130 INFO L93 Difference]: Finished difference Result 293 states and 299 transitions. [2021-11-25 20:48:06,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-25 20:48:06,130 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.6455696202531644) internal successors, (209), 79 states have internal predecessors, (209), 26 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 26 states have call predecessors, (27), 26 states have call successors, (27) Word has length 205 [2021-11-25 20:48:06,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:48:06,132 INFO L225 Difference]: With dead ends: 293 [2021-11-25 20:48:06,132 INFO L226 Difference]: Without dead ends: 215 [2021-11-25 20:48:06,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 576 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3828 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2478, Invalid=10632, Unknown=0, NotChecked=0, Total=13110 [2021-11-25 20:48:06,133 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 377 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 226 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 378 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 988 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 226 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:48:06,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [378 Valid, 328 Invalid, 988 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [226 Valid, 762 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:48:06,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-11-25 20:48:06,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 202. [2021-11-25 20:48:06,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 150 states have (on average 1.0133333333333334) internal successors, (152), 150 states have internal predecessors, (152), 27 states have call successors, (27), 24 states have call predecessors, (27), 24 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-25 20:48:06,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 206 transitions. [2021-11-25 20:48:06,226 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 206 transitions. Word has length 205 [2021-11-25 20:48:06,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:48:06,226 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 206 transitions. [2021-11-25 20:48:06,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.6455696202531644) internal successors, (209), 79 states have internal predecessors, (209), 26 states have call successors, (27), 1 states have call predecessors, (27), 1 states have return successors, (27), 26 states have call predecessors, (27), 26 states have call successors, (27) [2021-11-25 20:48:06,227 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 206 transitions. [2021-11-25 20:48:06,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2021-11-25 20:48:06,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:48:06,228 INFO L514 BasicCegarLoop]: trace histogram [27, 25, 25, 25, 25, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:48:06,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2021-11-25 20:48:06,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:48:06,428 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:48:06,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:48:06,428 INFO L85 PathProgramCache]: Analyzing trace with hash -2016756348, now seen corresponding path program 69 times [2021-11-25 20:48:06,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:48:06,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603517213] [2021-11-25 20:48:06,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:48:06,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:48:06,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:48:07,828 INFO L134 CoverageAnalysis]: Checked inductivity of 2432 backedges. 25 proven. 1755 refuted. 0 times theorem prover too weak. 652 trivial. 0 not checked. [2021-11-25 20:48:07,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:48:07,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603517213] [2021-11-25 20:48:07,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603517213] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:48:07,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928168685] [2021-11-25 20:48:07,829 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:48:07,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:48:07,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:48:07,830 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:48:07,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d08c2a49-da30-4cf2-a671-8fae708c486b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-25 20:48:08,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:48:08,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:48:08,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 777 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-25 20:48:08,778 INFO L286 TraceCheckSpWp]: Computing forward predicates...