./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrcat-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/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_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrcat-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8688e0efa9d37c2205606fbd307da42d83b0f0e2936dd15336b8b67e136d86b0 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:20:13,511 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:20:13,514 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:20:13,566 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:20:13,567 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:20:13,569 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:20:13,571 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:20:13,574 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:20:13,577 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:20:13,579 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:20:13,580 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:20:13,582 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:20:13,583 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:20:13,585 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:20:13,587 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:20:13,589 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:20:13,590 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:20:13,591 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:20:13,594 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:20:13,598 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:20:13,600 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:20:13,602 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:20:13,604 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:20:13,606 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:20:13,610 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:20:13,611 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:20:13,611 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:20:13,613 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:20:13,614 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:20:13,616 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:20:13,616 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:20:13,618 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:20:13,619 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:20:13,620 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:20:13,622 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:20:13,623 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:20:13,624 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:20:13,625 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:20:13,625 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:20:13,627 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:20:13,628 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:20:13,629 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-25 19:20:13,670 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:20:13,670 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:20:13,670 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:20:13,671 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:20:13,671 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:20:13,672 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:20:13,672 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:20:13,672 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:20:13,672 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:20:13,673 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:20:13,673 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:20:13,673 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:20:13,673 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:20:13,674 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:20:13,674 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:20:13,674 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:20:13,674 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:20:13,675 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:20:13,676 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 19:20:13,676 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 19:20:13,676 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:20:13,676 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:20:13,677 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 19:20:13,677 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:20:13,677 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:20:13,677 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:20:13,678 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 19:20:13,678 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 19:20:13,678 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 19:20:13,678 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:20:13,678 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 19:20:13,679 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:20:13,679 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:20:13,679 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:20:13,680 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:20:13,680 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:20:13,680 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:20:13,680 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:20:13,681 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:20:13,681 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:20:13,681 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:20:13,681 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:20:13,682 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_0947c09a-6763-4772-b034-7cbddb073ce2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8688e0efa9d37c2205606fbd307da42d83b0f0e2936dd15336b8b67e136d86b0 [2021-11-25 19:20:14,043 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:20:14,071 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:20:14,074 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:20:14,076 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:20:14,078 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:20:14,079 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-memsafety/openbsd_cstrcat-alloca-2.i [2021-11-25 19:20:14,193 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/data/2eeb4014c/821b18ea0013460c92e7fb1d4c5c624c/FLAGf0536c253 [2021-11-25 19:20:14,816 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:20:14,817 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/sv-benchmarks/c/array-memsafety/openbsd_cstrcat-alloca-2.i [2021-11-25 19:20:14,835 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/data/2eeb4014c/821b18ea0013460c92e7fb1d4c5c624c/FLAGf0536c253 [2021-11-25 19:20:15,104 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/data/2eeb4014c/821b18ea0013460c92e7fb1d4c5c624c [2021-11-25 19:20:15,106 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:20:15,108 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:20:15,121 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:20:15,121 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:20:15,126 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:20:15,127 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,128 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4992a6f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15, skipping insertion in model container [2021-11-25 19:20:15,129 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,136 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:20:15,181 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:20:15,632 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:20:15,640 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:20:15,683 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:20:15,718 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:20:15,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15 WrapperNode [2021-11-25 19:20:15,719 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:20:15,720 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:20:15,720 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:20:15,720 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:20:15,730 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,745 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,773 INFO L137 Inliner]: procedures = 117, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 94 [2021-11-25 19:20:15,773 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:20:15,774 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:20:15,774 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:20:15,774 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:20:15,784 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,784 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,789 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,790 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,798 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,803 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,805 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,808 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:20:15,809 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:20:15,809 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:20:15,809 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:20:15,811 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (1/1) ... [2021-11-25 19:20:15,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:20:15,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:15,850 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:20:15,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:20:15,896 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 19:20:15,896 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 19:20:15,897 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 19:20:15,897 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 19:20:15,897 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:20:15,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:20:15,996 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:20:15,998 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:20:16,245 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:20:16,310 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:20:16,310 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-25 19:20:16,313 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:20:16 BoogieIcfgContainer [2021-11-25 19:20:16,313 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:20:16,316 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:20:16,316 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:20:16,320 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:20:16,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:20:15" (1/3) ... [2021-11-25 19:20:16,321 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e0b50af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:20:16, skipping insertion in model container [2021-11-25 19:20:16,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:20:15" (2/3) ... [2021-11-25 19:20:16,322 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e0b50af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:20:16, skipping insertion in model container [2021-11-25 19:20:16,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:20:16" (3/3) ... [2021-11-25 19:20:16,324 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrcat-alloca-2.i [2021-11-25 19:20:16,330 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:20:16,330 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 15 error locations. [2021-11-25 19:20:16,385 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:20:16,393 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:20:16,393 INFO L340 AbstractCegarLoop]: Starting to check reachability of 15 error locations. [2021-11-25 19:20:16,409 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 16 states have (on average 2.375) internal successors, (38), 31 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:16,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 19:20:16,416 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:16,417 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 19:20:16,418 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:16,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:16,424 INFO L85 PathProgramCache]: Analyzing trace with hash 151696, now seen corresponding path program 1 times [2021-11-25 19:20:16,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:16,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638648627] [2021-11-25 19:20:16,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:16,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:16,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:16,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:16,633 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:16,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638648627] [2021-11-25 19:20:16,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638648627] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:16,635 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:16,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 19:20:16,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68455442] [2021-11-25 19:20:16,638 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:16,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:20:16,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:16,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:20:16,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:20:16,699 INFO L87 Difference]: Start difference. First operand has 32 states, 16 states have (on average 2.375) internal successors, (38), 31 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:16,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:16,765 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-11-25 19:20:16,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:20:16,768 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-25 19:20:16,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:16,777 INFO L225 Difference]: With dead ends: 33 [2021-11-25 19:20:16,777 INFO L226 Difference]: Without dead ends: 31 [2021-11-25 19:20:16,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:20:16,784 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 1 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:16,786 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 39 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:20:16,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-25 19:20:16,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-25 19:20:16,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 16 states have (on average 2.125) internal successors, (34), 30 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:16,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-11-25 19:20:16,826 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 3 [2021-11-25 19:20:16,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:16,827 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-11-25 19:20:16,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:16,827 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-11-25 19:20:16,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 19:20:16,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:16,829 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 19:20:16,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:20:16,829 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:16,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:16,831 INFO L85 PathProgramCache]: Analyzing trace with hash 4702270, now seen corresponding path program 1 times [2021-11-25 19:20:16,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:16,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044362274] [2021-11-25 19:20:16,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:16,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:16,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:16,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:16,929 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:16,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044362274] [2021-11-25 19:20:16,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044362274] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:16,930 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:16,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:20:16,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333322520] [2021-11-25 19:20:16,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:16,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:20:16,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:16,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:20:16,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:20:16,935 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:17,002 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2021-11-25 19:20:17,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:20:17,003 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-25 19:20:17,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:17,004 INFO L225 Difference]: With dead ends: 29 [2021-11-25 19:20:17,004 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 19:20:17,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:20:17,007 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 27 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:17,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 13 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:20:17,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 19:20:17,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-25 19:20:17,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 16 states have (on average 2.0) internal successors, (32), 28 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-11-25 19:20:17,014 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 4 [2021-11-25 19:20:17,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:17,015 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-11-25 19:20:17,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,015 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-11-25 19:20:17,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 19:20:17,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:17,016 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 19:20:17,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:20:17,017 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:17,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:17,018 INFO L85 PathProgramCache]: Analyzing trace with hash 4702271, now seen corresponding path program 1 times [2021-11-25 19:20:17,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:17,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381188885] [2021-11-25 19:20:17,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:17,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:17,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:17,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:17,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:17,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381188885] [2021-11-25 19:20:17,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381188885] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:17,144 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:17,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:20:17,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889757905] [2021-11-25 19:20:17,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:17,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:20:17,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:17,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:20:17,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:20:17,147 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:17,303 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-11-25 19:20:17,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:20:17,305 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-25 19:20:17,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:17,307 INFO L225 Difference]: With dead ends: 55 [2021-11-25 19:20:17,307 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 19:20:17,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:20:17,311 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 28 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:17,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 35 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:20:17,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 19:20:17,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 31. [2021-11-25 19:20:17,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 30 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-11-25 19:20:17,327 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 4 [2021-11-25 19:20:17,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:17,327 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-11-25 19:20:17,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,328 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-11-25 19:20:17,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 19:20:17,330 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:17,330 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 19:20:17,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:20:17,331 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:17,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:17,332 INFO L85 PathProgramCache]: Analyzing trace with hash 145855487, now seen corresponding path program 1 times [2021-11-25 19:20:17,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:17,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659881362] [2021-11-25 19:20:17,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:17,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:17,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:17,413 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:17,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:17,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659881362] [2021-11-25 19:20:17,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [659881362] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:17,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:17,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:20:17,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894162305] [2021-11-25 19:20:17,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:17,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:20:17,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:17,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:20:17,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:20:17,417 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:17,474 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2021-11-25 19:20:17,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:20:17,480 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-25 19:20:17,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:17,482 INFO L225 Difference]: With dead ends: 29 [2021-11-25 19:20:17,482 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 19:20:17,482 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:20:17,486 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 24 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:17,487 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 13 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:20:17,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 19:20:17,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-25 19:20:17,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-11-25 19:20:17,492 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 5 [2021-11-25 19:20:17,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:17,493 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-11-25 19:20:17,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,493 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-11-25 19:20:17,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 19:20:17,494 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:17,494 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 19:20:17,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 19:20:17,495 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:17,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:17,496 INFO L85 PathProgramCache]: Analyzing trace with hash 145855488, now seen corresponding path program 1 times [2021-11-25 19:20:17,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:17,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946288036] [2021-11-25 19:20:17,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:17,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:17,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:17,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:17,607 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:17,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946288036] [2021-11-25 19:20:17,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946288036] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:17,608 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:17,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:20:17,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807258407] [2021-11-25 19:20:17,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:17,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:20:17,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:17,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:20:17,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:20:17,610 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 5 states, 4 states have (on average 1.25) internal successors, (5), 5 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:17,705 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2021-11-25 19:20:17,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:20:17,706 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 5 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-25 19:20:17,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:17,707 INFO L225 Difference]: With dead ends: 50 [2021-11-25 19:20:17,707 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 19:20:17,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:20:17,709 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 50 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:17,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 28 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:20:17,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 19:20:17,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 31. [2021-11-25 19:20:17,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 20 states have (on average 1.8) internal successors, (36), 30 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-11-25 19:20:17,716 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 5 [2021-11-25 19:20:17,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:17,717 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-11-25 19:20:17,717 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 5 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,718 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-11-25 19:20:17,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 19:20:17,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:17,718 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 19:20:17,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 19:20:17,719 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:17,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:17,733 INFO L85 PathProgramCache]: Analyzing trace with hash 145857698, now seen corresponding path program 1 times [2021-11-25 19:20:17,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:17,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719789004] [2021-11-25 19:20:17,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:17,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:17,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:17,857 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:17,858 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:17,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719789004] [2021-11-25 19:20:17,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719789004] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:17,859 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:17,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:20:17,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234023040] [2021-11-25 19:20:17,860 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:17,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:20:17,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:17,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:20:17,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:20:17,863 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:17,900 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2021-11-25 19:20:17,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:20:17,901 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-25 19:20:17,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:17,901 INFO L225 Difference]: With dead ends: 30 [2021-11-25 19:20:17,901 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 19:20:17,902 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:20:17,903 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 53 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:17,904 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 9 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:20:17,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 19:20:17,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-25 19:20:17,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.75) internal successors, (35), 29 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2021-11-25 19:20:17,909 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 5 [2021-11-25 19:20:17,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:17,909 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2021-11-25 19:20:17,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:17,910 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2021-11-25 19:20:17,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:20:17,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:17,910 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2021-11-25 19:20:17,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 19:20:17,911 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:17,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:17,911 INFO L85 PathProgramCache]: Analyzing trace with hash 223988269, now seen corresponding path program 1 times [2021-11-25 19:20:17,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:17,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848848718] [2021-11-25 19:20:17,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:17,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:17,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:18,033 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:18,033 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:18,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848848718] [2021-11-25 19:20:18,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [848848718] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:18,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1383507434] [2021-11-25 19:20:18,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:18,035 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:18,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:18,037 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:18,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:20:18,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:18,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 19:20:18,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:18,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:18,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:18,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:20:18,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:18,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:18,667 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:18,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1383507434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:18,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1748737789] [2021-11-25 19:20:18,687 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-25 19:20:18,688 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:18,693 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:18,698 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:18,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:18,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:18,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:18,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:18,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:19,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:19,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:19,210 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:20:19,653 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '508#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_#t~nondet13#1| 127) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~i~0#1| 1)) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet13#1|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:20:19,653 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:20:19,654 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:20:19,654 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-11-25 19:20:19,654 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390829007] [2021-11-25 19:20:19,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:20:19,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:20:19,655 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:19,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:20:19,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:20:19,659 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:19,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:19,917 INFO L93 Difference]: Finished difference Result 76 states and 88 transitions. [2021-11-25 19:20:19,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:20:19,918 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 19:20:19,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:19,919 INFO L225 Difference]: With dead ends: 76 [2021-11-25 19:20:19,919 INFO L226 Difference]: Without dead ends: 76 [2021-11-25 19:20:19,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-11-25 19:20:19,921 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 190 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:19,922 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 82 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:20:19,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-25 19:20:19,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 27. [2021-11-25 19:20:19,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:19,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-11-25 19:20:19,928 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 6 [2021-11-25 19:20:19,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:19,928 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-11-25 19:20:19,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:19,929 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-11-25 19:20:19,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:20:19,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:19,930 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 19:20:19,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:20:20,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:20,143 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:20,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:20,144 INFO L85 PathProgramCache]: Analyzing trace with hash 226621346, now seen corresponding path program 1 times [2021-11-25 19:20:20,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:20,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870284920] [2021-11-25 19:20:20,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:20,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:20,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:20,323 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:20,324 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:20,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870284920] [2021-11-25 19:20:20,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870284920] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:20,325 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:20,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:20:20,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178570683] [2021-11-25 19:20:20,325 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:20,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:20:20,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:20,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:20:20,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:20:20,331 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:20,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:20,524 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-11-25 19:20:20,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:20:20,525 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 19:20:20,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:20,526 INFO L225 Difference]: With dead ends: 44 [2021-11-25 19:20:20,526 INFO L226 Difference]: Without dead ends: 44 [2021-11-25 19:20:20,526 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:20:20,527 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 110 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:20,528 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 27 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:20:20,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-25 19:20:20,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 29. [2021-11-25 19:20:20,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.65) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:20,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-11-25 19:20:20,533 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 6 [2021-11-25 19:20:20,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:20,533 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-11-25 19:20:20,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:20,533 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-11-25 19:20:20,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 19:20:20,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:20,534 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-11-25 19:20:20,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 19:20:20,535 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:20,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:20,535 INFO L85 PathProgramCache]: Analyzing trace with hash -1566735583, now seen corresponding path program 1 times [2021-11-25 19:20:20,535 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:20,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073396570] [2021-11-25 19:20:20,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:20,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:20,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:20,627 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:20,628 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:20,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073396570] [2021-11-25 19:20:20,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073396570] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:20,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988658237] [2021-11-25 19:20:20,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:20,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:20,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:20,630 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:20,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:20:20,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:20,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 19:20:20,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:20,730 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:20:20,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:20:20,792 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:20,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:20,957 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:20,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988658237] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:20,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1961218084] [2021-11-25 19:20:20,959 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 19:20:20,960 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:20,960 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:20,960 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:20,960 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:21,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:21,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:21,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:21,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:21,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:21,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:21,289 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:20:21,856 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '753#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= |ULTIMATE.start_main_#t~nondet15#1| 127) (< (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~i~1#1| 1)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet15#1|)) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:20:21,857 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:20:21,857 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:20:21,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2021-11-25 19:20:21,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138003817] [2021-11-25 19:20:21,857 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:20:21,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 19:20:21,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:21,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 19:20:21,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:20:21,859 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 11 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:22,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:22,092 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2021-11-25 19:20:22,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:20:22,093 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 19:20:22,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:22,094 INFO L225 Difference]: With dead ends: 62 [2021-11-25 19:20:22,094 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 19:20:22,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=81, Invalid=261, Unknown=0, NotChecked=0, Total=342 [2021-11-25 19:20:22,096 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 168 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:22,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 78 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:20:22,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 19:20:22,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 27. [2021-11-25 19:20:22,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.631578947368421) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:22,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-11-25 19:20:22,101 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 7 [2021-11-25 19:20:22,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:22,101 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-11-25 19:20:22,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:22,102 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-11-25 19:20:22,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 19:20:22,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:22,102 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:22,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:20:22,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:22,329 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:22,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:22,329 INFO L85 PathProgramCache]: Analyzing trace with hash -1564671430, now seen corresponding path program 1 times [2021-11-25 19:20:22,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:22,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490407564] [2021-11-25 19:20:22,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:22,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:22,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:22,377 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:22,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:22,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490407564] [2021-11-25 19:20:22,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1490407564] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:22,378 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:22,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:20:22,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759675986] [2021-11-25 19:20:22,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:22,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:20:22,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:22,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:20:22,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:20:22,380 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:22,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:22,408 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-11-25 19:20:22,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:20:22,409 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 19:20:22,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:22,409 INFO L225 Difference]: With dead ends: 26 [2021-11-25 19:20:22,409 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 19:20:22,410 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:20:22,411 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:22,412 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 14 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:20:22,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 19:20:22,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-25 19:20:22,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:22,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-11-25 19:20:22,419 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 7 [2021-11-25 19:20:22,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:22,419 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-11-25 19:20:22,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:22,420 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-11-25 19:20:22,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 19:20:22,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:22,420 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:22,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 19:20:22,421 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:22,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:22,421 INFO L85 PathProgramCache]: Analyzing trace with hash -1564671429, now seen corresponding path program 1 times [2021-11-25 19:20:22,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:22,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059009473] [2021-11-25 19:20:22,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:22,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:22,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:22,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:22,508 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:22,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059009473] [2021-11-25 19:20:22,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2059009473] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:22,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:22,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:20:22,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444454828] [2021-11-25 19:20:22,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:22,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:20:22,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:22,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:20:22,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:20:22,512 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:22,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:22,580 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2021-11-25 19:20:22,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:20:22,581 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 19:20:22,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:22,582 INFO L225 Difference]: With dead ends: 29 [2021-11-25 19:20:22,582 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 19:20:22,583 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:20:22,584 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 45 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:22,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 13 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:20:22,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 19:20:22,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-11-25 19:20:22,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.55) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:22,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-11-25 19:20:22,591 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 7 [2021-11-25 19:20:22,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:22,592 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-11-25 19:20:22,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:22,592 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-11-25 19:20:22,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:20:22,593 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:22,593 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:22,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-25 19:20:22,594 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:22,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:22,595 INFO L85 PathProgramCache]: Analyzing trace with hash -1324094303, now seen corresponding path program 1 times [2021-11-25 19:20:22,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:22,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133658772] [2021-11-25 19:20:22,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:22,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:22,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:22,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:22,759 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:22,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133658772] [2021-11-25 19:20:22,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133658772] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:22,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125169046] [2021-11-25 19:20:22,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:22,760 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:22,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:22,765 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:22,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:20:22,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:22,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 19:20:22,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:22,859 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:20:22,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:20:22,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:22,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:23,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:23,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2125169046] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:23,163 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:20:23,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 13 [2021-11-25 19:20:23,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824529] [2021-11-25 19:20:23,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:23,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:20:23,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:23,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:20:23,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:20:23,166 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:23,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:23,247 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-11-25 19:20:23,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:20:23,250 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 19:20:23,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:23,251 INFO L225 Difference]: With dead ends: 26 [2021-11-25 19:20:23,252 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 19:20:23,252 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=134, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:20:23,253 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 58 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:23,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 8 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:20:23,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 19:20:23,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2021-11-25 19:20:23,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:23,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-11-25 19:20:23,263 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 8 [2021-11-25 19:20:23,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:23,264 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-11-25 19:20:23,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:23,264 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-11-25 19:20:23,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 19:20:23,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:23,266 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:23,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:20:23,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:23,477 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:23,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:23,478 INFO L85 PathProgramCache]: Analyzing trace with hash -410688015, now seen corresponding path program 1 times [2021-11-25 19:20:23,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:23,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741960663] [2021-11-25 19:20:23,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:23,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:23,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:23,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:23,596 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:23,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741960663] [2021-11-25 19:20:23,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741960663] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:23,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500635495] [2021-11-25 19:20:23,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:23,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:23,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:23,598 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:23,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:20:23,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:23,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 19:20:23,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:23,724 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:20:23,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:20:23,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:23,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:23,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:23,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [500635495] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:23,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [294471270] [2021-11-25 19:20:24,003 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:20:24,003 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:24,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:24,004 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:24,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:24,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:24,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:24,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:24,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:24,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:24,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:20:24,394 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:20:25,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [294471270] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:25,994 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:20:25,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 6, 6] total 21 [2021-11-25 19:20:25,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807069494] [2021-11-25 19:20:25,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:25,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:20:25,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:25,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:20:25,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=342, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:20:25,997 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:26,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:26,293 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2021-11-25 19:20:26,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:20:26,294 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 19:20:26,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:26,295 INFO L225 Difference]: With dead ends: 65 [2021-11-25 19:20:26,295 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 19:20:26,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=120, Invalid=342, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:20:26,296 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 56 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:26,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 24 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:20:26,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 19:20:26,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 40. [2021-11-25 19:20:26,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 39 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:26,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2021-11-25 19:20:26,301 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 9 [2021-11-25 19:20:26,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:26,302 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2021-11-25 19:20:26,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:26,302 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2021-11-25 19:20:26,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:20:26,303 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:26,303 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:26,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:20:26,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 19:20:26,518 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:26,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:26,518 INFO L85 PathProgramCache]: Analyzing trace with hash 153538389, now seen corresponding path program 1 times [2021-11-25 19:20:26,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:26,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316359628] [2021-11-25 19:20:26,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:26,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:26,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:26,578 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:26,578 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:26,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316359628] [2021-11-25 19:20:26,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316359628] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:26,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:26,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:20:26,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435570015] [2021-11-25 19:20:26,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:26,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:20:26,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:26,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:20:26,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:20:26,581 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:26,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:26,630 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-11-25 19:20:26,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:20:26,630 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 19:20:26,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:26,631 INFO L225 Difference]: With dead ends: 39 [2021-11-25 19:20:26,631 INFO L226 Difference]: Without dead ends: 39 [2021-11-25 19:20:26,631 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:20:26,632 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 32 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:26,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 15 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:20:26,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-25 19:20:26,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-11-25 19:20:26,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.4705882352941178) internal successors, (50), 38 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:26,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 50 transitions. [2021-11-25 19:20:26,637 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 50 transitions. Word has length 10 [2021-11-25 19:20:26,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:26,637 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 50 transitions. [2021-11-25 19:20:26,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:26,638 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 50 transitions. [2021-11-25 19:20:26,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:20:26,638 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:26,638 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:26,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-25 19:20:26,639 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:26,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:26,639 INFO L85 PathProgramCache]: Analyzing trace with hash 153538390, now seen corresponding path program 1 times [2021-11-25 19:20:26,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:26,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901840116] [2021-11-25 19:20:26,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:26,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:26,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:26,741 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:26,741 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:26,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901840116] [2021-11-25 19:20:26,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [901840116] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:26,742 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:26,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:20:26,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778956583] [2021-11-25 19:20:26,742 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:26,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:20:26,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:26,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:20:26,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:20:26,744 INFO L87 Difference]: Start difference. First operand 39 states and 50 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:26,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:26,831 INFO L93 Difference]: Finished difference Result 50 states and 64 transitions. [2021-11-25 19:20:26,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:20:26,832 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 19:20:26,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:26,832 INFO L225 Difference]: With dead ends: 50 [2021-11-25 19:20:26,833 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 19:20:26,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:20:26,834 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 36 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:26,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 27 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:20:26,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 19:20:26,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2021-11-25 19:20:26,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:26,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2021-11-25 19:20:26,838 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 10 [2021-11-25 19:20:26,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:26,838 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2021-11-25 19:20:26,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:26,838 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2021-11-25 19:20:26,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:20:26,839 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:26,839 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:26,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-25 19:20:26,840 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:26,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:26,840 INFO L85 PathProgramCache]: Analyzing trace with hash 661807299, now seen corresponding path program 1 times [2021-11-25 19:20:26,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:26,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737418139] [2021-11-25 19:20:26,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:26,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:26,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:26,980 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:26,981 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:26,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737418139] [2021-11-25 19:20:26,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737418139] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:26,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294035701] [2021-11-25 19:20:26,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:26,982 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:26,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:26,985 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:27,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:20:27,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:27,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 19:20:27,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:27,103 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:20:27,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:20:27,221 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:27,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:27,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:27,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294035701] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:27,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [829340057] [2021-11-25 19:20:27,396 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:20:27,397 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:27,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:27,397 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:27,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:27,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:27,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:27,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:27,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:27,600 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 14 treesize of output 10 [2021-11-25 19:20:27,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:27,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:27,807 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:20:27,808 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 19:20:27,949 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:20:29,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [829340057] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:29,475 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:20:29,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [6, 6, 6] total 23 [2021-11-25 19:20:29,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117075679] [2021-11-25 19:20:29,475 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:29,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:20:29,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:29,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:20:29,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2021-11-25 19:20:29,477 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:29,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:29,635 INFO L93 Difference]: Finished difference Result 70 states and 88 transitions. [2021-11-25 19:20:29,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 19:20:29,636 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 19:20:29,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:29,637 INFO L225 Difference]: With dead ends: 70 [2021-11-25 19:20:29,637 INFO L226 Difference]: Without dead ends: 70 [2021-11-25 19:20:29,638 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2021-11-25 19:20:29,639 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 50 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:29,639 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 31 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:20:29,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-25 19:20:29,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 48. [2021-11-25 19:20:29,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.3953488372093024) internal successors, (60), 47 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:29,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2021-11-25 19:20:29,645 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 11 [2021-11-25 19:20:29,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:29,645 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2021-11-25 19:20:29,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:29,646 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2021-11-25 19:20:29,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:20:29,646 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:29,647 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:29,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:20:29,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 19:20:29,861 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:29,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:29,861 INFO L85 PathProgramCache]: Analyzing trace with hash -1112351598, now seen corresponding path program 1 times [2021-11-25 19:20:29,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:29,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143249850] [2021-11-25 19:20:29,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:29,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:29,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:30,021 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:30,021 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:30,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143249850] [2021-11-25 19:20:30,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2143249850] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:30,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318823216] [2021-11-25 19:20:30,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:30,022 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:30,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:30,023 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:30,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:20:30,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:30,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 19:20:30,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:30,144 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:20:30,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:20:30,326 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:30,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:30,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:30,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1318823216] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:30,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245896427] [2021-11-25 19:20:30,605 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:20:30,605 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:30,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:30,606 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:30,606 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:30,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:30,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:30,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:30,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:30,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:30,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:30,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:31,061 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:20:31,062 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 19:20:31,267 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:20:32,240 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1729#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:20:32,240 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:20:32,241 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:20:32,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 21 [2021-11-25 19:20:32,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626840261] [2021-11-25 19:20:32,241 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:20:32,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 19:20:32,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:32,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 19:20:32,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=748, Unknown=0, NotChecked=0, Total=870 [2021-11-25 19:20:32,243 INFO L87 Difference]: Start difference. First operand 48 states and 60 transitions. Second operand has 22 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:32,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:32,784 INFO L93 Difference]: Finished difference Result 109 states and 133 transitions. [2021-11-25 19:20:32,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:20:32,785 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 19:20:32,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:32,786 INFO L225 Difference]: With dead ends: 109 [2021-11-25 19:20:32,786 INFO L226 Difference]: Without dead ends: 109 [2021-11-25 19:20:32,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=238, Invalid=1168, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 19:20:32,787 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 333 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 333 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:32,788 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [333 Valid, 92 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:20:32,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-25 19:20:32,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 56. [2021-11-25 19:20:32,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.411764705882353) internal successors, (72), 55 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:32,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 72 transitions. [2021-11-25 19:20:32,792 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 72 transitions. Word has length 11 [2021-11-25 19:20:32,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:32,793 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 72 transitions. [2021-11-25 19:20:32,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:32,793 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 72 transitions. [2021-11-25 19:20:32,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:20:32,793 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:32,794 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:32,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:20:33,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 19:20:33,013 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:33,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:33,014 INFO L85 PathProgramCache]: Analyzing trace with hash 464722824, now seen corresponding path program 1 times [2021-11-25 19:20:33,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:33,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212615639] [2021-11-25 19:20:33,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:33,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:33,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:33,047 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:33,047 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:33,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212615639] [2021-11-25 19:20:33,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212615639] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:33,048 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:33,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:20:33,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443514633] [2021-11-25 19:20:33,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:33,049 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:20:33,049 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:33,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:20:33,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:20:33,050 INFO L87 Difference]: Start difference. First operand 56 states and 72 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:33,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:33,087 INFO L93 Difference]: Finished difference Result 55 states and 70 transitions. [2021-11-25 19:20:33,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:20:33,087 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 19:20:33,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:33,090 INFO L225 Difference]: With dead ends: 55 [2021-11-25 19:20:33,090 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 19:20:33,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:20:33,091 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 10 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:33,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 14 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:20:33,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 19:20:33,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-25 19:20:33,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 51 states have (on average 1.3725490196078431) internal successors, (70), 54 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:33,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2021-11-25 19:20:33,096 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 11 [2021-11-25 19:20:33,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:33,097 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2021-11-25 19:20:33,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:33,097 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2021-11-25 19:20:33,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:20:33,098 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:33,098 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:33,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-25 19:20:33,099 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:33,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:33,100 INFO L85 PathProgramCache]: Analyzing trace with hash 464722825, now seen corresponding path program 1 times [2021-11-25 19:20:33,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:33,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133683373] [2021-11-25 19:20:33,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:33,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:33,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:33,183 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:33,183 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:33,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133683373] [2021-11-25 19:20:33,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133683373] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:33,183 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:33,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:20:33,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211140613] [2021-11-25 19:20:33,184 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:33,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:20:33,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:33,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:20:33,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:20:33,185 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:33,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:33,288 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2021-11-25 19:20:33,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:20:33,288 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 19:20:33,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:33,289 INFO L225 Difference]: With dead ends: 63 [2021-11-25 19:20:33,289 INFO L226 Difference]: Without dead ends: 63 [2021-11-25 19:20:33,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:20:33,290 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 46 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:33,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 11 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:20:33,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-25 19:20:33,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-11-25 19:20:33,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 57 states have (on average 1.3333333333333333) internal successors, (76), 60 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:33,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2021-11-25 19:20:33,294 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 11 [2021-11-25 19:20:33,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:33,294 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2021-11-25 19:20:33,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:33,295 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2021-11-25 19:20:33,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 19:20:33,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:33,296 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:33,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-25 19:20:33,296 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:33,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:33,297 INFO L85 PathProgramCache]: Analyzing trace with hash 1878121950, now seen corresponding path program 1 times [2021-11-25 19:20:33,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:33,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529027171] [2021-11-25 19:20:33,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:33,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:33,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:33,469 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:33,470 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:33,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529027171] [2021-11-25 19:20:33,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [529027171] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:33,470 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:33,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 19:20:33,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684173974] [2021-11-25 19:20:33,471 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:33,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:20:33,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:33,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:20:33,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:20:33,472 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:33,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:33,617 INFO L93 Difference]: Finished difference Result 62 states and 73 transitions. [2021-11-25 19:20:33,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:20:33,617 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 19:20:33,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:33,618 INFO L225 Difference]: With dead ends: 62 [2021-11-25 19:20:33,618 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 19:20:33,619 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:20:33,620 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 23 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:33,620 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 64 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:20:33,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 19:20:33,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 51. [2021-11-25 19:20:33,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 47 states have (on average 1.3191489361702127) internal successors, (62), 50 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:33,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 62 transitions. [2021-11-25 19:20:33,624 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 62 transitions. Word has length 14 [2021-11-25 19:20:33,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:33,624 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 62 transitions. [2021-11-25 19:20:33,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:33,625 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 62 transitions. [2021-11-25 19:20:33,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 19:20:33,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:33,626 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:33,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-25 19:20:33,626 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:33,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:33,627 INFO L85 PathProgramCache]: Analyzing trace with hash -1190753538, now seen corresponding path program 2 times [2021-11-25 19:20:33,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:33,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795991642] [2021-11-25 19:20:33,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:33,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:33,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:33,820 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:20:33,820 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:33,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795991642] [2021-11-25 19:20:33,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795991642] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:33,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1409996204] [2021-11-25 19:20:33,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:20:33,821 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:33,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:33,823 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:33,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:20:33,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 19:20:33,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:20:33,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 19:20:33,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:34,020 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 14 treesize of output 10 [2021-11-25 19:20:34,117 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-25 19:20:34,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2021-11-25 19:20:34,136 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:20:34,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:34,193 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 15 treesize of output 13 [2021-11-25 19:20:34,195 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 26 treesize of output 22 [2021-11-25 19:20:34,304 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:20:34,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1409996204] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:34,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [788519766] [2021-11-25 19:20:34,307 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:20:34,307 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:34,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:34,308 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:34,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:34,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:34,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:34,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:34,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:34,520 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 14 treesize of output 10 [2021-11-25 19:20:34,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:34,648 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 14 treesize of output 10 [2021-11-25 19:20:34,726 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:20:34,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:20:34,931 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:20:35,989 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2404#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:20:35,989 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:20:35,989 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:20:35,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 21 [2021-11-25 19:20:35,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282115304] [2021-11-25 19:20:35,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:20:35,990 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 19:20:35,990 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:35,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 19:20:35,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=709, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:20:35,991 INFO L87 Difference]: Start difference. First operand 51 states and 62 transitions. Second operand has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:36,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:36,272 INFO L93 Difference]: Finished difference Result 98 states and 112 transitions. [2021-11-25 19:20:36,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 19:20:36,274 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 19:20:36,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:36,275 INFO L225 Difference]: With dead ends: 98 [2021-11-25 19:20:36,276 INFO L226 Difference]: Without dead ends: 98 [2021-11-25 19:20:36,277 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=177, Invalid=1013, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 19:20:36,277 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 162 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:36,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 128 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 160 Invalid, 0 Unknown, 28 Unchecked, 0.1s Time] [2021-11-25 19:20:36,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-25 19:20:36,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 67. [2021-11-25 19:20:36,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 66 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:36,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 81 transitions. [2021-11-25 19:20:36,282 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 81 transitions. Word has length 15 [2021-11-25 19:20:36,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:36,283 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 81 transitions. [2021-11-25 19:20:36,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:36,283 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 81 transitions. [2021-11-25 19:20:36,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 19:20:36,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:36,284 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:36,329 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-25 19:20:36,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:36,501 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:36,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:36,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1191841184, now seen corresponding path program 1 times [2021-11-25 19:20:36,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:36,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554991596] [2021-11-25 19:20:36,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:36,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:36,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:36,691 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:36,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:36,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554991596] [2021-11-25 19:20:36,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554991596] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:36,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042696710] [2021-11-25 19:20:36,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:36,692 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:36,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:36,693 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:36,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:20:36,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:36,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 19:20:36,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:36,831 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:20:36,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:20:37,042 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:37,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:37,351 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:37,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042696710] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:37,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [119111552] [2021-11-25 19:20:37,353 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 19:20:37,353 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:37,354 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:37,354 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:37,354 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:37,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:37,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:37,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:37,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:37,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:37,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:37,639 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:20:37,639 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 19:20:37,947 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:20:39,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [119111552] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:39,345 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:20:39,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [9, 9, 9] total 35 [2021-11-25 19:20:39,345 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199092889] [2021-11-25 19:20:39,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:39,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:20:39,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:39,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:20:39,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1114, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 19:20:39,347 INFO L87 Difference]: Start difference. First operand 67 states and 81 transitions. Second operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:42,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:42,399 INFO L93 Difference]: Finished difference Result 69 states and 81 transitions. [2021-11-25 19:20:42,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 19:20:42,400 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 19:20:42,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:42,401 INFO L225 Difference]: With dead ends: 69 [2021-11-25 19:20:42,401 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 19:20:42,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=297, Invalid=1683, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 19:20:42,404 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 17 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:42,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 69 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:20:42,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 19:20:42,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2021-11-25 19:20:42,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 54 states have (on average 1.2777777777777777) internal successors, (69), 57 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:42,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2021-11-25 19:20:42,408 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 15 [2021-11-25 19:20:42,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:42,408 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2021-11-25 19:20:42,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:42,408 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2021-11-25 19:20:42,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 19:20:42,409 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:42,410 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:42,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:20:42,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-25 19:20:42,625 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:42,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:42,625 INFO L85 PathProgramCache]: Analyzing trace with hash 1164628604, now seen corresponding path program 1 times [2021-11-25 19:20:42,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:42,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346848954] [2021-11-25 19:20:42,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:42,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:42,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:42,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:20:42,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:42,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346848954] [2021-11-25 19:20:42,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346848954] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:42,727 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:20:42,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:20:42,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366260364] [2021-11-25 19:20:42,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:42,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:20:42,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:42,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:20:42,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:20:42,729 INFO L87 Difference]: Start difference. First operand 58 states and 69 transitions. Second operand has 4 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:42,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:42,759 INFO L93 Difference]: Finished difference Result 57 states and 68 transitions. [2021-11-25 19:20:42,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:20:42,760 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-25 19:20:42,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:42,761 INFO L225 Difference]: With dead ends: 57 [2021-11-25 19:20:42,761 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 19:20:42,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:20:42,762 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 7 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:42,763 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 18 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:20:42,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 19:20:42,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-25 19:20:42,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 52 states have (on average 1.2692307692307692) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:42,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-25 19:20:42,766 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 16 [2021-11-25 19:20:42,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:42,766 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-25 19:20:42,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:42,767 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-25 19:20:42,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 19:20:42,768 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:42,768 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:42,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-25 19:20:42,768 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:42,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:42,769 INFO L85 PathProgramCache]: Analyzing trace with hash 1164629580, now seen corresponding path program 1 times [2021-11-25 19:20:42,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:42,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29809190] [2021-11-25 19:20:42,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:42,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:42,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:42,936 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:42,936 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:42,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29809190] [2021-11-25 19:20:42,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29809190] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:42,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284809578] [2021-11-25 19:20:42,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:42,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:42,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:42,939 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:42,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:20:43,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:43,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 19:20:43,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:43,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:43,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:43,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:20:43,255 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:43,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:43,476 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:43,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284809578] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:43,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [304562819] [2021-11-25 19:20:43,479 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:20:43,480 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:43,480 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:43,480 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:43,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:43,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:43,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:43,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:43,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:43,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:43,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:43,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:43,860 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:20:43,860 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 19:20:44,029 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:20:44,031 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:20:44,074 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:20:44,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:20:44,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:44,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:44,673 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:20:47,324 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3082#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:20:47,324 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:20:47,324 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:20:47,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 21 [2021-11-25 19:20:47,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223407608] [2021-11-25 19:20:47,324 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:20:47,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 19:20:47,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:47,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 19:20:47,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 19:20:47,326 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 22 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 22 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:47,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:47,758 INFO L93 Difference]: Finished difference Result 65 states and 75 transitions. [2021-11-25 19:20:47,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 19:20:47,760 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 22 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-25 19:20:47,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:47,760 INFO L225 Difference]: With dead ends: 65 [2021-11-25 19:20:47,760 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 19:20:47,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=231, Invalid=1575, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 19:20:47,762 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 155 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:47,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 43 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:20:47,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 19:20:47,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 59. [2021-11-25 19:20:47,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 56 states have (on average 1.2678571428571428) internal successors, (71), 58 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:47,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 71 transitions. [2021-11-25 19:20:47,765 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 71 transitions. Word has length 16 [2021-11-25 19:20:47,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:47,765 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 71 transitions. [2021-11-25 19:20:47,766 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 22 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:47,766 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 71 transitions. [2021-11-25 19:20:47,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 19:20:47,766 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:47,767 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:47,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:20:47,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-25 19:20:47,977 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:47,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:47,977 INFO L85 PathProgramCache]: Analyzing trace with hash -1835268174, now seen corresponding path program 1 times [2021-11-25 19:20:47,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:47,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942052070] [2021-11-25 19:20:47,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:47,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:47,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:48,129 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:48,130 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:48,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942052070] [2021-11-25 19:20:48,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942052070] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:48,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872596801] [2021-11-25 19:20:48,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:48,130 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:48,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:48,131 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:48,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:20:48,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:48,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 19:20:48,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:48,233 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:20:48,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:20:48,424 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:48,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:48,692 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:48,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872596801] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:48,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1727943200] [2021-11-25 19:20:48,694 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:20:48,695 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:48,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:48,695 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:48,695 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:48,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:48,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:48,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:48,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:48,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:48,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:48,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:49,039 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 14 treesize of output 10 [2021-11-25 19:20:49,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:49,116 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 14 treesize of output 10 [2021-11-25 19:20:49,181 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:20:49,182 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 19:20:49,443 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:20:51,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1727943200] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:20:51,037 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:20:51,037 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [10, 9, 9] total 37 [2021-11-25 19:20:51,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836435184] [2021-11-25 19:20:51,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:20:51,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 19:20:51,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:51,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 19:20:51,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1248, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 19:20:51,039 INFO L87 Difference]: Start difference. First operand 59 states and 71 transitions. Second operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:52,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:52,588 INFO L93 Difference]: Finished difference Result 59 states and 70 transitions. [2021-11-25 19:20:52,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 19:20:52,589 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-25 19:20:52,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:52,590 INFO L225 Difference]: With dead ends: 59 [2021-11-25 19:20:52,590 INFO L226 Difference]: Without dead ends: 59 [2021-11-25 19:20:52,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=208, Invalid=1598, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 19:20:52,591 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:52,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 18 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:20:52,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-25 19:20:52,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2021-11-25 19:20:52,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 53 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:52,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2021-11-25 19:20:52,594 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 17 [2021-11-25 19:20:52,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:52,594 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2021-11-25 19:20:52,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:52,595 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2021-11-25 19:20:52,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 19:20:52,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:52,596 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:52,639 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:20:52,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:52,817 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:52,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:52,817 INFO L85 PathProgramCache]: Analyzing trace with hash 1743778643, now seen corresponding path program 1 times [2021-11-25 19:20:52,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:52,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597407051] [2021-11-25 19:20:52,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:52,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:52,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:52,973 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:52,974 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:52,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597407051] [2021-11-25 19:20:52,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597407051] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:52,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109965470] [2021-11-25 19:20:52,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:52,975 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:52,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:52,976 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:53,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 19:20:53,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:53,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 19:20:53,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:53,118 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:20:53,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:20:53,329 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:53,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:53,615 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:53,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109965470] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:53,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1252596681] [2021-11-25 19:20:53,618 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:20:53,619 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:53,619 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:53,619 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:53,620 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:53,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:53,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:53,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:53,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:53,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:53,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:53,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:53,983 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:20:53,983 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 19:20:54,123 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:20:54,124 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:20:54,160 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:20:54,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:20:54,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:54,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:20:54,533 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:20:56,684 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3609#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= |ULTIMATE.start_main_~length3~0#1| 1) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:20:56,684 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:20:56,684 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:20:56,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 20 [2021-11-25 19:20:56,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218917660] [2021-11-25 19:20:56,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:20:56,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 19:20:56,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:20:56,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 19:20:56,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=983, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 19:20:56,686 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 21 states, 20 states have (on average 2.45) internal successors, (49), 21 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:57,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:20:57,219 INFO L93 Difference]: Finished difference Result 76 states and 86 transitions. [2021-11-25 19:20:57,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:20:57,219 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.45) internal successors, (49), 21 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-25 19:20:57,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:20:57,220 INFO L225 Difference]: With dead ends: 76 [2021-11-25 19:20:57,220 INFO L226 Difference]: Without dead ends: 76 [2021-11-25 19:20:57,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=244, Invalid=1562, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 19:20:57,221 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 117 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:20:57,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 28 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:20:57,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-25 19:20:57,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2021-11-25 19:20:57,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 70 states have (on average 1.2142857142857142) internal successors, (85), 72 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:57,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 85 transitions. [2021-11-25 19:20:57,223 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 85 transitions. Word has length 17 [2021-11-25 19:20:57,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:20:57,224 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 85 transitions. [2021-11-25 19:20:57,224 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.45) internal successors, (49), 21 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:20:57,224 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 85 transitions. [2021-11-25 19:20:57,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 19:20:57,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:20:57,224 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:20:57,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 19:20:57,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-25 19:20:57,425 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:20:57,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:20:57,425 INFO L85 PathProgramCache]: Analyzing trace with hash -577846049, now seen corresponding path program 3 times [2021-11-25 19:20:57,425 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:20:57,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634796960] [2021-11-25 19:20:57,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:20:57,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:20:57,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:20:57,584 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:57,585 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:57,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634796960] [2021-11-25 19:20:57,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634796960] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:20:57,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299841188] [2021-11-25 19:20:57,585 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:20:57,585 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:20:57,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:20:57,586 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:20:57,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 19:20:57,657 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:20:57,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:20:57,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 19:20:57,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:20:57,688 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:20:57,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:20:57,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:58,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:58,042 INFO L354 Elim1Store]: treesize reduction 6, result has 76.0 percent of original size [2021-11-25 19:20:58,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 28 treesize of output 29 [2021-11-25 19:20:58,228 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:20:58,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:20:58,542 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 29 treesize of output 25 [2021-11-25 19:20:58,551 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:20:58,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 39 [2021-11-25 19:20:58,929 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:20:58,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299841188] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:58,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [531122894] [2021-11-25 19:20:58,931 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:20:58,932 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:58,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:58,932 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:58,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:58,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:58,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:20:58,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:20:59,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:59,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:59,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:59,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:20:59,281 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:20:59,281 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 19:20:59,433 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:00,429 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3912#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:00,429 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:00,429 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:00,429 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 26 [2021-11-25 19:21:00,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669392696] [2021-11-25 19:21:00,430 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:00,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 19:21:00,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:00,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 19:21:00,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1066, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 19:21:00,431 INFO L87 Difference]: Start difference. First operand 73 states and 85 transitions. Second operand has 27 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 27 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:01,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:01,524 INFO L93 Difference]: Finished difference Result 95 states and 110 transitions. [2021-11-25 19:21:01,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 19:21:01,526 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 27 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-25 19:21:01,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:01,527 INFO L225 Difference]: With dead ends: 95 [2021-11-25 19:21:01,527 INFO L226 Difference]: Without dead ends: 95 [2021-11-25 19:21:01,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=309, Invalid=2343, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 19:21:01,530 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 46 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:01,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 73 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 480 Invalid, 0 Unknown, 81 Unchecked, 0.3s Time] [2021-11-25 19:21:01,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-25 19:21:01,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 81. [2021-11-25 19:21:01,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 78 states have (on average 1.2179487179487178) internal successors, (95), 80 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:01,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 95 transitions. [2021-11-25 19:21:01,534 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 95 transitions. Word has length 17 [2021-11-25 19:21:01,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:01,535 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 95 transitions. [2021-11-25 19:21:01,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 27 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:01,535 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 95 transitions. [2021-11-25 19:21:01,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 19:21:01,536 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:01,536 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:01,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 19:21:01,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 19:21:01,755 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:01,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:01,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1280145876, now seen corresponding path program 2 times [2021-11-25 19:21:01,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:01,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749639094] [2021-11-25 19:21:01,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:01,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:01,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:02,106 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:02,107 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:02,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749639094] [2021-11-25 19:21:02,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [749639094] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:02,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628498640] [2021-11-25 19:21:02,107 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:21:02,108 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:02,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:02,113 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:02,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 19:21:02,237 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 19:21:02,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:21:02,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-25 19:21:02,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:02,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:21:02,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:02,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:21:02,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:21:02,549 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 15 treesize of output 7 [2021-11-25 19:21:02,558 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:02,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:02,610 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_432 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_432) |c_ULTIMATE.start_cstrcat_~append#1.base|) |c_ULTIMATE.start_cstrcat_~append#1.offset|) 0)) is different from false [2021-11-25 19:21:02,751 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:21:02,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:21:02,760 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:21:02,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:21:02,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:03,023 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2021-11-25 19:21:03,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628498640] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:03,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1419304567] [2021-11-25 19:21:03,025 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:21:03,026 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:03,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:03,026 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:03,026 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:03,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:03,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:03,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:03,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:03,216 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 14 treesize of output 10 [2021-11-25 19:21:03,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:03,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:03,383 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:03,383 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 19:21:03,550 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:03,551 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:03,587 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:21:03,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:21:03,748 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 11 treesize of output 7 [2021-11-25 19:21:03,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:04,066 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:06,199 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4271#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:06,199 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:06,199 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:06,199 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 27 [2021-11-25 19:21:06,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576126973] [2021-11-25 19:21:06,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:06,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 19:21:06,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:06,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 19:21:06,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1336, Unknown=1, NotChecked=74, Total=1560 [2021-11-25 19:21:06,202 INFO L87 Difference]: Start difference. First operand 81 states and 95 transitions. Second operand has 27 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 27 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:06,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:06,611 INFO L93 Difference]: Finished difference Result 141 states and 163 transitions. [2021-11-25 19:21:06,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 19:21:06,612 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 27 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-25 19:21:06,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:06,613 INFO L225 Difference]: With dead ends: 141 [2021-11-25 19:21:06,613 INFO L226 Difference]: Without dead ends: 129 [2021-11-25 19:21:06,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=244, Invalid=1829, Unknown=1, NotChecked=88, Total=2162 [2021-11-25 19:21:06,614 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 70 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 150 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:06,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 150 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 275 Invalid, 0 Unknown, 150 Unchecked, 0.2s Time] [2021-11-25 19:21:06,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-25 19:21:06,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 96. [2021-11-25 19:21:06,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 93 states have (on average 1.2150537634408602) internal successors, (113), 95 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:06,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 113 transitions. [2021-11-25 19:21:06,619 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 113 transitions. Word has length 20 [2021-11-25 19:21:06,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:06,619 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 113 transitions. [2021-11-25 19:21:06,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 27 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:06,620 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 113 transitions. [2021-11-25 19:21:06,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 19:21:06,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:06,621 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:06,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 19:21:06,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 19:21:06,840 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:06,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:06,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1022067915, now seen corresponding path program 4 times [2021-11-25 19:21:06,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:06,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241770535] [2021-11-25 19:21:06,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:06,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:06,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:07,001 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:21:07,001 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:07,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241770535] [2021-11-25 19:21:07,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241770535] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:07,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590317138] [2021-11-25 19:21:07,002 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:21:07,002 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:07,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:07,003 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:07,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 19:21:07,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:07,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 19:21:07,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:07,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:07,372 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 15 treesize of output 7 [2021-11-25 19:21:07,383 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:21:07,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:07,467 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 15 treesize of output 13 [2021-11-25 19:21:07,470 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 26 treesize of output 22 [2021-11-25 19:21:07,706 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:21:07,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590317138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:07,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932559104] [2021-11-25 19:21:07,708 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:21:07,709 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:07,709 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:07,709 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:07,709 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:07,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:07,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:07,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:07,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:07,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:07,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:07,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:08,022 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:08,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 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 19:21:08,166 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:09,093 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4684#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:09,094 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:09,094 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:09,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 28 [2021-11-25 19:21:09,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730732948] [2021-11-25 19:21:09,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:09,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 19:21:09,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:09,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 19:21:09,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1116, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 19:21:09,096 INFO L87 Difference]: Start difference. First operand 96 states and 113 transitions. Second operand has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:09,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:09,583 INFO L93 Difference]: Finished difference Result 194 states and 218 transitions. [2021-11-25 19:21:09,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 19:21:09,583 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-25 19:21:09,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:09,585 INFO L225 Difference]: With dead ends: 194 [2021-11-25 19:21:09,585 INFO L226 Difference]: Without dead ends: 186 [2021-11-25 19:21:09,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=251, Invalid=1641, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 19:21:09,587 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 189 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:09,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 277 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 432 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:21:09,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-11-25 19:21:09,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 114. [2021-11-25 19:21:09,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 111 states have (on average 1.2162162162162162) internal successors, (135), 113 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:09,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 135 transitions. [2021-11-25 19:21:09,594 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 135 transitions. Word has length 21 [2021-11-25 19:21:09,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:09,595 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 135 transitions. [2021-11-25 19:21:09,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:09,595 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 135 transitions. [2021-11-25 19:21:09,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 19:21:09,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:09,596 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:09,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 19:21:09,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 19:21:09,809 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:09,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:09,809 INFO L85 PathProgramCache]: Analyzing trace with hash -333846590, now seen corresponding path program 3 times [2021-11-25 19:21:09,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:09,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034035559] [2021-11-25 19:21:09,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:09,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:09,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:09,973 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:09,974 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:09,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034035559] [2021-11-25 19:21:09,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034035559] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:09,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797892734] [2021-11-25 19:21:09,974 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:21:09,974 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:09,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:09,976 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:09,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 19:21:10,073 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:21:10,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:21:10,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-25 19:21:10,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:10,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:21:10,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:10,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:21:10,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 26 [2021-11-25 19:21:10,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:10,781 INFO L354 Elim1Store]: treesize reduction 9, result has 66.7 percent of original size [2021-11-25 19:21:10,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 30 treesize of output 28 [2021-11-25 19:21:10,947 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:21:10,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:11,601 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrcat_#t~post5#1.offset_46| Int) (v_ArrVal_498 (Array Int Int)) (v_ArrVal_499 (Array Int Int))) (or (<= (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_46| 3) (select |c_#length| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (< |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_46| 0) (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_46|) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_499) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_46| 1)) 0) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_498) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_46|) 0))) is different from false [2021-11-25 19:21:11,628 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:21:11,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 34 [2021-11-25 19:21:11,635 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:11,648 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:21:11,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 58 treesize of output 65 [2021-11-25 19:21:11,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:11,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:21:11,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-25 19:21:11,895 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:21:11,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797892734] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:11,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [37061489] [2021-11-25 19:21:11,898 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:21:11,898 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:11,899 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:11,899 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:11,899 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:11,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:11,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:11,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:12,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:12,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:12,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:12,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:12,248 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:12,248 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 19:21:12,372 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:12,373 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:12,401 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:21:12,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:21:12,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:12,648 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 11 treesize of output 7 [2021-11-25 19:21:12,761 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:15,491 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5175#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:15,491 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:15,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:15,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 12] total 32 [2021-11-25 19:21:15,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266281364] [2021-11-25 19:21:15,492 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:15,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 19:21:15,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:15,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 19:21:15,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1790, Unknown=4, NotChecked=86, Total=2070 [2021-11-25 19:21:15,494 INFO L87 Difference]: Start difference. First operand 114 states and 135 transitions. Second operand has 33 states, 32 states have (on average 1.875) internal successors, (60), 33 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:16,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:16,251 INFO L93 Difference]: Finished difference Result 114 states and 134 transitions. [2021-11-25 19:21:16,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 19:21:16,252 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.875) internal successors, (60), 33 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-25 19:21:16,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:16,257 INFO L225 Difference]: With dead ends: 114 [2021-11-25 19:21:16,257 INFO L226 Difference]: Without dead ends: 114 [2021-11-25 19:21:16,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 593 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=302, Invalid=2890, Unknown=4, NotChecked=110, Total=3306 [2021-11-25 19:21:16,259 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 27 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 102 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:16,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 98 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 145 Invalid, 0 Unknown, 102 Unchecked, 0.1s Time] [2021-11-25 19:21:16,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-25 19:21:16,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2021-11-25 19:21:16,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 105 states have (on average 1.2190476190476192) internal successors, (128), 107 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:16,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 128 transitions. [2021-11-25 19:21:16,269 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 128 transitions. Word has length 22 [2021-11-25 19:21:16,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:16,270 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 128 transitions. [2021-11-25 19:21:16,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.875) internal successors, (60), 33 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:16,271 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 128 transitions. [2021-11-25 19:21:16,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 19:21:16,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:16,272 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:16,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 19:21:16,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:16,501 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:16,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:16,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1661005332, now seen corresponding path program 5 times [2021-11-25 19:21:16,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:16,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593118195] [2021-11-25 19:21:16,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:16,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:16,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:16,709 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:21:16,710 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:16,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593118195] [2021-11-25 19:21:16,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593118195] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:16,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759842483] [2021-11-25 19:21:16,711 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:21:16,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:16,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:16,713 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:16,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 19:21:16,835 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 19:21:16,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:21:16,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 19:21:16,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:16,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:17,029 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 15 treesize of output 7 [2021-11-25 19:21:17,035 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:21:17,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:17,087 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 15 treesize of output 13 [2021-11-25 19:21:17,089 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 26 treesize of output 22 [2021-11-25 19:21:17,199 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:21:17,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759842483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:17,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1788517415] [2021-11-25 19:21:17,202 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:21:17,202 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:17,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:17,202 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:17,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:17,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:17,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:17,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:17,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:17,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:17,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:17,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:17,546 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:17,546 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 19:21:17,740 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:18,702 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5592#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:18,702 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:18,702 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:18,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 24 [2021-11-25 19:21:18,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749951851] [2021-11-25 19:21:18,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:18,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 19:21:18,703 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:18,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 19:21:18,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=887, Unknown=0, NotChecked=0, Total=992 [2021-11-25 19:21:18,705 INFO L87 Difference]: Start difference. First operand 108 states and 128 transitions. Second operand has 24 states, 24 states have (on average 1.75) internal successors, (42), 24 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:19,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:19,287 INFO L93 Difference]: Finished difference Result 227 states and 252 transitions. [2021-11-25 19:21:19,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 19:21:19,287 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.75) internal successors, (42), 24 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-25 19:21:19,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:19,289 INFO L225 Difference]: With dead ends: 227 [2021-11-25 19:21:19,289 INFO L226 Difference]: Without dead ends: 217 [2021-11-25 19:21:19,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=212, Invalid=1510, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 19:21:19,291 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 138 mSDsluCounter, 373 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:19,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 379 Invalid, 637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 528 Invalid, 0 Unknown, 54 Unchecked, 0.3s Time] [2021-11-25 19:21:19,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-11-25 19:21:19,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 126. [2021-11-25 19:21:19,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 123 states have (on average 1.2276422764227641) internal successors, (151), 125 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:19,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 151 transitions. [2021-11-25 19:21:19,300 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 151 transitions. Word has length 23 [2021-11-25 19:21:19,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:19,301 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 151 transitions. [2021-11-25 19:21:19,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.75) internal successors, (42), 24 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:19,301 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 151 transitions. [2021-11-25 19:21:19,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 19:21:19,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:19,302 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:19,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 19:21:19,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:19,529 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:19,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:19,529 INFO L85 PathProgramCache]: Analyzing trace with hash -225956835, now seen corresponding path program 1 times [2021-11-25 19:21:19,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:19,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477519010] [2021-11-25 19:21:19,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:19,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:19,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:19,874 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:21:19,875 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:19,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477519010] [2021-11-25 19:21:19,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477519010] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:19,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268741100] [2021-11-25 19:21:19,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:19,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:19,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:19,876 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:19,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 19:21:19,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:19,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-25 19:21:19,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:19,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:21:20,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:20,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:21:20,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:21:20,226 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 15 treesize of output 7 [2021-11-25 19:21:20,233 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:21:20,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:20,272 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_570 (Array Int Int))) (= 0 (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_570) |c_ULTIMATE.start_cstrcat_~append#1.base|) |c_ULTIMATE.start_cstrcat_~append#1.offset|))) is different from false [2021-11-25 19:21:20,281 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_570 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_570) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:21:20,320 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_570 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_570) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0)) is different from false [2021-11-25 19:21:20,325 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:21:20,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:21:20,330 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:21:20,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:21:20,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:20,470 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 3 not checked. [2021-11-25 19:21:20,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268741100] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:20,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [361373415] [2021-11-25 19:21:20,472 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:21:20,473 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:20,473 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:20,473 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:20,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:20,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:20,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:20,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:20,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:20,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:20,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:20,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:20,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:20,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:20,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:20,905 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:20,905 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 19:21:21,106 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:21:21,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:21:21,217 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 11 treesize of output 7 [2021-11-25 19:21:21,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:21,660 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:24,997 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6136#(and (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (or (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcat_#t~post4#1.base|) |ULTIMATE.start_cstrcat_#t~post4#1.offset|) 0) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_cstrcat_#t~post5#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|)) (= |#NULL.base| 0)) (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= 1 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (exists ((|v_ULTIMATE.start_cstrcat_#t~post4#1.base_61| Int) (|v_ULTIMATE.start_cstrcat_#t~post4#1.offset_60| Int)) (and (= 1 (select |#valid| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_61|)) (<= (+ |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_60| 1) (select |#length| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_61|)) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.base_61|) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_60|) (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_61|) |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_60|) 0)))) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|))' at error location [2021-11-25 19:21:24,997 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:24,997 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:24,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 25 [2021-11-25 19:21:24,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309009288] [2021-11-25 19:21:24,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:24,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 19:21:24,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:24,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 19:21:24,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1133, Unknown=3, NotChecked=210, Total=1482 [2021-11-25 19:21:24,999 INFO L87 Difference]: Start difference. First operand 126 states and 151 transitions. Second operand has 25 states, 25 states have (on average 1.88) internal successors, (47), 25 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:25,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:25,263 INFO L93 Difference]: Finished difference Result 164 states and 194 transitions. [2021-11-25 19:21:25,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 19:21:25,263 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 25 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-25 19:21:25,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:25,264 INFO L225 Difference]: With dead ends: 164 [2021-11-25 19:21:25,264 INFO L226 Difference]: Without dead ends: 150 [2021-11-25 19:21:25,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 44 SyntacticMatches, 5 SemanticMatches, 40 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=163, Invalid=1328, Unknown=3, NotChecked=228, Total=1722 [2021-11-25 19:21:25,265 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 42 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 121 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:25,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 143 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 312 Invalid, 0 Unknown, 121 Unchecked, 0.2s Time] [2021-11-25 19:21:25,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-25 19:21:25,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 146. [2021-11-25 19:21:25,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 143 states have (on average 1.2237762237762237) internal successors, (175), 145 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:25,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 175 transitions. [2021-11-25 19:21:25,271 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 175 transitions. Word has length 24 [2021-11-25 19:21:25,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:25,271 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 175 transitions. [2021-11-25 19:21:25,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 25 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:25,271 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 175 transitions. [2021-11-25 19:21:25,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 19:21:25,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:25,272 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:25,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 19:21:25,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:25,489 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:25,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:25,489 INFO L85 PathProgramCache]: Analyzing trace with hash -1072925247, now seen corresponding path program 1 times [2021-11-25 19:21:25,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:25,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039985080] [2021-11-25 19:21:25,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:25,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:25,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:25,707 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:25,708 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:25,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039985080] [2021-11-25 19:21:25,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039985080] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:25,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005839565] [2021-11-25 19:21:25,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:25,708 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:25,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:25,710 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:25,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 19:21:25,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:25,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-25 19:21:25,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:25,832 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:21:25,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:21:26,115 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:26,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:26,517 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:26,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005839565] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:26,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [121911161] [2021-11-25 19:21:26,518 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:21:26,519 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:26,519 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:26,519 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:26,519 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:26,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:26,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:26,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:26,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:26,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:26,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:26,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:26,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:26,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:26,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:26,947 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:26,948 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 19:21:27,160 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:21:27,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:21:27,233 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 11 treesize of output 7 [2021-11-25 19:21:27,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:27,553 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:30,371 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6646#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:30,371 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:30,372 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:30,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 33 [2021-11-25 19:21:30,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940208325] [2021-11-25 19:21:30,372 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:30,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 19:21:30,372 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:30,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 19:21:30,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=2047, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 19:21:30,374 INFO L87 Difference]: Start difference. First operand 146 states and 175 transitions. Second operand has 34 states, 33 states have (on average 2.212121212121212) internal successors, (73), 34 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:32,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:32,576 INFO L93 Difference]: Finished difference Result 226 states and 252 transitions. [2021-11-25 19:21:32,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 19:21:32,576 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 2.212121212121212) internal successors, (73), 34 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-25 19:21:32,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:32,578 INFO L225 Difference]: With dead ends: 226 [2021-11-25 19:21:32,578 INFO L226 Difference]: Without dead ends: 194 [2021-11-25 19:21:32,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1579 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=838, Invalid=5482, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 19:21:32,580 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 401 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 926 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 401 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 1040 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 926 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:32,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [401 Valid, 135 Invalid, 1040 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 926 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:21:32,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-25 19:21:32,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 158. [2021-11-25 19:21:32,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 155 states have (on average 1.1870967741935483) internal successors, (184), 157 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:32,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 184 transitions. [2021-11-25 19:21:32,587 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 184 transitions. Word has length 25 [2021-11-25 19:21:32,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:32,587 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 184 transitions. [2021-11-25 19:21:32,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 2.212121212121212) internal successors, (73), 34 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:32,587 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 184 transitions. [2021-11-25 19:21:32,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 19:21:32,588 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:32,588 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:32,624 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-25 19:21:32,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-25 19:21:32,805 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:32,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:32,805 INFO L85 PathProgramCache]: Analyzing trace with hash 1180949197, now seen corresponding path program 6 times [2021-11-25 19:21:32,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:32,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757541248] [2021-11-25 19:21:32,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:32,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:32,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:33,062 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:33,062 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:33,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757541248] [2021-11-25 19:21:33,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757541248] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:33,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094474702] [2021-11-25 19:21:33,063 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:21:33,063 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:33,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:33,065 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:33,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 19:21:33,169 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:21:33,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:21:33,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-25 19:21:33,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:33,197 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:21:33,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:21:33,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:33,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:33,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:33,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:33,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:33,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:33,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:33,945 INFO L354 Elim1Store]: treesize reduction 18, result has 64.7 percent of original size [2021-11-25 19:21:33,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 48 treesize of output 51 [2021-11-25 19:21:34,126 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:21:34,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:34,693 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 59 treesize of output 51 [2021-11-25 19:21:34,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:34,703 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:34,704 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:34,705 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:34,705 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:34,706 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:34,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 81 [2021-11-25 19:21:35,203 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:21:35,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094474702] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:35,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1042575740] [2021-11-25 19:21:35,205 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:21:35,205 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:35,206 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:35,206 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:35,206 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:35,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:35,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:35,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:35,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:35,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:35,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:35,436 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 14 treesize of output 10 [2021-11-25 19:21:35,517 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:35,517 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 19:21:35,706 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:36,842 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7291#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:36,842 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:36,843 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:36,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 38 [2021-11-25 19:21:36,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896600412] [2021-11-25 19:21:36,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:36,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-25 19:21:36,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:36,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-25 19:21:36,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1953, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 19:21:36,845 INFO L87 Difference]: Start difference. First operand 158 states and 184 transitions. Second operand has 39 states, 38 states have (on average 1.605263157894737) internal successors, (61), 39 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:39,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:39,015 INFO L93 Difference]: Finished difference Result 227 states and 263 transitions. [2021-11-25 19:21:39,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-25 19:21:39,015 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.605263157894737) internal successors, (61), 39 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-25 19:21:39,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:39,017 INFO L225 Difference]: With dead ends: 227 [2021-11-25 19:21:39,017 INFO L226 Difference]: Without dead ends: 227 [2021-11-25 19:21:39,019 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1264 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=656, Invalid=5506, Unknown=0, NotChecked=0, Total=6162 [2021-11-25 19:21:39,019 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 82 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 818 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:39,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 81 Invalid, 891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 818 Invalid, 0 Unknown, 26 Unchecked, 0.4s Time] [2021-11-25 19:21:39,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-25 19:21:39,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 182. [2021-11-25 19:21:39,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 179 states have (on average 1.2067039106145252) internal successors, (216), 181 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:39,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 216 transitions. [2021-11-25 19:21:39,026 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 216 transitions. Word has length 25 [2021-11-25 19:21:39,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:39,026 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 216 transitions. [2021-11-25 19:21:39,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.605263157894737) internal successors, (61), 39 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:39,027 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 216 transitions. [2021-11-25 19:21:39,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 19:21:39,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:39,028 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:39,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 19:21:39,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-25 19:21:39,241 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:39,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:39,241 INFO L85 PathProgramCache]: Analyzing trace with hash -646974709, now seen corresponding path program 2 times [2021-11-25 19:21:39,241 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:39,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521601658] [2021-11-25 19:21:39,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:39,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:39,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:39,373 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:21:39,373 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:39,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521601658] [2021-11-25 19:21:39,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521601658] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:39,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069502526] [2021-11-25 19:21:39,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:21:39,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:39,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:39,375 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:39,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 19:21:39,517 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 19:21:39,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:21:39,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 19:21:39,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:39,685 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:21:39,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:39,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 19:21:39,883 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:21:39,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069502526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:39,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1361083895] [2021-11-25 19:21:39,884 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:21:39,885 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:39,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:39,885 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:39,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:39,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:39,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:39,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:39,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:40,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:40,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:40,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:40,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:40,228 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 14 treesize of output 10 [2021-11-25 19:21:40,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:40,301 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:40,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:21:40,581 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:21:40,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:21:40,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:40,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:41,189 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:44,554 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7945#(and (or (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcat_#t~post4#1.base|) |ULTIMATE.start_cstrcat_#t~post4#1.offset|) 0) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_cstrcat_#t~post5#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|)) (= |#NULL.base| 0)) (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= 1 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (exists ((|v_ULTIMATE.start_cstrcat_#t~post4#1.base_78| Int) (|v_ULTIMATE.start_cstrcat_#t~post4#1.offset_77| Int)) (and (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_77|) (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_78|) |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_77|) 0)) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.base_78|) (= (select |#valid| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_78|) 1) (<= (+ |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_77| 1) (select |#length| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_78|)))) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|))' at error location [2021-11-25 19:21:44,554 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:44,554 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:44,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 22 [2021-11-25 19:21:44,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931806289] [2021-11-25 19:21:44,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:44,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 19:21:44,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:44,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 19:21:44,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1194, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 19:21:44,557 INFO L87 Difference]: Start difference. First operand 182 states and 216 transitions. Second operand has 23 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 23 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:44,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:44,941 INFO L93 Difference]: Finished difference Result 223 states and 254 transitions. [2021-11-25 19:21:44,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 19:21:44,942 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 23 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-25 19:21:44,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:44,943 INFO L225 Difference]: With dead ends: 223 [2021-11-25 19:21:44,943 INFO L226 Difference]: Without dead ends: 223 [2021-11-25 19:21:44,944 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=280, Invalid=1882, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 19:21:44,945 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 158 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:44,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 81 Invalid, 376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:21:44,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-25 19:21:44,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 189. [2021-11-25 19:21:44,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 186 states have (on average 1.1989247311827957) internal successors, (223), 188 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:44,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 223 transitions. [2021-11-25 19:21:44,952 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 223 transitions. Word has length 26 [2021-11-25 19:21:44,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:44,952 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 223 transitions. [2021-11-25 19:21:44,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 23 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:44,953 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 223 transitions. [2021-11-25 19:21:44,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 19:21:44,953 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:44,954 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:44,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 19:21:45,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-25 19:21:45,161 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:45,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:45,161 INFO L85 PathProgramCache]: Analyzing trace with hash -108339126, now seen corresponding path program 4 times [2021-11-25 19:21:45,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:45,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242561385] [2021-11-25 19:21:45,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:45,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:45,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:45,781 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:45,781 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:45,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242561385] [2021-11-25 19:21:45,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [242561385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:45,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638478177] [2021-11-25 19:21:45,782 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:21:45,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:45,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:45,783 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:45,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 19:21:45,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:45,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-25 19:21:45,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:45,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:21:46,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:46,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:21:46,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:21:46,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:21:46,266 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 15 treesize of output 7 [2021-11-25 19:21:46,271 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:46,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:46,287 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_727 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_727) |c_ULTIMATE.start_cstrcat_~append#1.base|) |c_ULTIMATE.start_cstrcat_~append#1.offset|) 0)) is different from false [2021-11-25 19:21:46,293 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_727 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_727) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:21:46,300 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_726 (Array Int Int)) (v_ArrVal_727 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_726) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_727) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:21:46,309 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_727 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_727) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 2 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:21:46,318 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_727 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_727) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2)) 0)) is different from false [2021-11-25 19:21:46,323 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:21:46,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:21:46,328 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:21:46,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:21:46,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:46,495 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 11 not checked. [2021-11-25 19:21:46,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638478177] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:46,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411659345] [2021-11-25 19:21:46,496 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:21:46,497 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:46,497 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:46,497 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:46,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:46,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:46,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:46,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:46,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:46,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:46,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:46,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:46,728 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:46,729 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 19:21:46,845 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:46,847 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:46,872 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:21:46,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:21:46,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:47,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:47,197 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:49,962 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8576#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:49,962 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:49,962 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:49,962 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 15, 15] total 35 [2021-11-25 19:21:49,962 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777380529] [2021-11-25 19:21:49,963 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:49,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 19:21:49,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:49,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 19:21:49,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1676, Unknown=5, NotChecked=430, Total=2256 [2021-11-25 19:21:49,964 INFO L87 Difference]: Start difference. First operand 189 states and 223 transitions. Second operand has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 35 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:50,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:50,606 INFO L93 Difference]: Finished difference Result 257 states and 298 transitions. [2021-11-25 19:21:50,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 19:21:50,606 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 35 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-25 19:21:50,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:50,608 INFO L225 Difference]: With dead ends: 257 [2021-11-25 19:21:50,608 INFO L226 Difference]: Without dead ends: 217 [2021-11-25 19:21:50,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 47 SyntacticMatches, 7 SemanticMatches, 57 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 662 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=225, Invalid=2649, Unknown=8, NotChecked=540, Total=3422 [2021-11-25 19:21:50,609 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 44 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 195 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:50,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 215 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 365 Invalid, 0 Unknown, 195 Unchecked, 0.2s Time] [2021-11-25 19:21:50,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-11-25 19:21:50,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 216. [2021-11-25 19:21:50,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 213 states have (on average 1.1971830985915493) internal successors, (255), 215 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:50,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 255 transitions. [2021-11-25 19:21:50,618 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 255 transitions. Word has length 26 [2021-11-25 19:21:50,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:50,619 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 255 transitions. [2021-11-25 19:21:50,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 35 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:50,619 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 255 transitions. [2021-11-25 19:21:50,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 19:21:50,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:50,622 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:50,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 19:21:50,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:50,841 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:50,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:50,842 INFO L85 PathProgramCache]: Analyzing trace with hash -979590216, now seen corresponding path program 5 times [2021-11-25 19:21:50,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:50,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248586757] [2021-11-25 19:21:50,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:50,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:50,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:51,043 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:51,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:51,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248586757] [2021-11-25 19:21:51,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248586757] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:51,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668717249] [2021-11-25 19:21:51,044 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:21:51,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:51,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:51,046 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:51,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 19:21:51,225 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 19:21:51,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:21:51,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 19:21:51,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:51,454 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:51,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:51,681 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 7 treesize of output 5 [2021-11-25 19:21:51,710 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:51,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668717249] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:51,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [494802255] [2021-11-25 19:21:51,711 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:21:51,712 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:51,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:51,712 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:51,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:51,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:51,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:51,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:51,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:51,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:51,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:51,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:51,943 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:51,943 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 19:21:52,052 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:52,054 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:52,082 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:21:52,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:21:52,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:52,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:52,359 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:54,311 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9281#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:54,311 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:54,311 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:54,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 30 [2021-11-25 19:21:54,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976413022] [2021-11-25 19:21:54,311 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:54,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 19:21:54,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:54,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 19:21:54,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1695, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 19:21:54,313 INFO L87 Difference]: Start difference. First operand 216 states and 255 transitions. Second operand has 31 states, 30 states have (on average 2.433333333333333) internal successors, (73), 31 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:54,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:21:54,872 INFO L93 Difference]: Finished difference Result 310 states and 357 transitions. [2021-11-25 19:21:54,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 19:21:54,872 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.433333333333333) internal successors, (73), 31 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-25 19:21:54,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:21:54,874 INFO L225 Difference]: With dead ends: 310 [2021-11-25 19:21:54,874 INFO L226 Difference]: Without dead ends: 310 [2021-11-25 19:21:54,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 746 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=435, Invalid=2757, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 19:21:54,875 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 272 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 539 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 570 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:21:54,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [272 Valid, 132 Invalid, 570 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 539 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:21:54,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-11-25 19:21:54,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 252. [2021-11-25 19:21:54,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 249 states have (on average 1.216867469879518) internal successors, (303), 251 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:54,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 303 transitions. [2021-11-25 19:21:54,883 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 303 transitions. Word has length 28 [2021-11-25 19:21:54,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:21:54,884 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 303 transitions. [2021-11-25 19:21:54,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 2.433333333333333) internal successors, (73), 31 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:54,884 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 303 transitions. [2021-11-25 19:21:54,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 19:21:54,885 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:21:54,885 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:21:54,915 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 19:21:55,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-25 19:21:55,101 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:21:55,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:21:55,101 INFO L85 PathProgramCache]: Analyzing trace with hash -302525593, now seen corresponding path program 2 times [2021-11-25 19:21:55,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:21:55,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128299353] [2021-11-25 19:21:55,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:21:55,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:21:55,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:21:55,289 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:55,289 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:21:55,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128299353] [2021-11-25 19:21:55,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128299353] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:21:55,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535504490] [2021-11-25 19:21:55,290 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:21:55,290 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:21:55,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:21:55,291 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:21:55,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 19:21:55,469 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 19:21:55,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:21:55,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-25 19:21:55,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:21:55,494 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:21:55,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:21:55,807 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:55,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:21:56,198 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:21:56,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535504490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:21:56,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [793900699] [2021-11-25 19:21:56,199 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:21:56,200 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:21:56,200 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:21:56,200 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:21:56,200 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:21:56,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:56,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:21:56,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:21:56,276 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 14 treesize of output 10 [2021-11-25 19:21:56,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:56,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:56,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:21:56,464 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:21:56,465 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 19:21:56,583 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:56,584 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:21:56,611 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:21:56,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:21:56,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:56,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:21:56,913 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:59,132 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10082#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= |ULTIMATE.start_main_~length3~0#1| 1) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:59,132 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:59,132 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:21:59,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 31 [2021-11-25 19:21:59,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493399957] [2021-11-25 19:21:59,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:59,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 19:21:59,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:59,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 19:21:59,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=1761, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 19:21:59,134 INFO L87 Difference]: Start difference. First operand 252 states and 303 transitions. Second operand has 32 states, 31 states have (on average 2.7419354838709675) internal successors, (85), 32 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:00,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:22:00,540 INFO L93 Difference]: Finished difference Result 372 states and 422 transitions. [2021-11-25 19:22:00,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 19:22:00,541 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.7419354838709675) internal successors, (85), 32 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-25 19:22:00,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:22:00,543 INFO L225 Difference]: With dead ends: 372 [2021-11-25 19:22:00,543 INFO L226 Difference]: Without dead ends: 372 [2021-11-25 19:22:00,544 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 988 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=748, Invalid=4082, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 19:22:00,544 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 396 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 658 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:22:00,545 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [396 Valid, 85 Invalid, 766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 658 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:22:00,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2021-11-25 19:22:00,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 258. [2021-11-25 19:22:00,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 255 states have (on average 1.2156862745098038) internal successors, (310), 257 states have internal predecessors, (310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:00,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 310 transitions. [2021-11-25 19:22:00,554 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 310 transitions. Word has length 29 [2021-11-25 19:22:00,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:22:00,554 INFO L470 AbstractCegarLoop]: Abstraction has 258 states and 310 transitions. [2021-11-25 19:22:00,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.7419354838709675) internal successors, (85), 32 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:00,555 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 310 transitions. [2021-11-25 19:22:00,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 19:22:00,556 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:22:00,556 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:22:00,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 19:22:00,770 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-25 19:22:00,771 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:22:00,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:22:00,771 INFO L85 PathProgramCache]: Analyzing trace with hash -353886445, now seen corresponding path program 3 times [2021-11-25 19:22:00,771 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:22:00,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966638386] [2021-11-25 19:22:00,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:22:00,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:22:00,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:22:01,081 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:22:01,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:22:01,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966638386] [2021-11-25 19:22:01,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966638386] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:22:01,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494087027] [2021-11-25 19:22:01,082 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:22:01,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:22:01,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:22:01,083 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:22:01,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 19:22:01,222 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:22:01,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:22:01,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 19:22:01,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:22:01,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:22:01,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:22:01,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 19:22:01,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:22:01,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:22:01,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:22:01,862 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:22:01,863 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 19:22:01,871 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:22:01,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:22:02,488 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:22:02,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2021-11-25 19:22:02,496 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:22:02,496 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 33 treesize of output 33 [2021-11-25 19:22:02,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-25 19:22:02,931 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 15 refuted. 1 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:22:02,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494087027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:22:02,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [878556763] [2021-11-25 19:22:02,933 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:22:02,933 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:22:02,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:22:02,933 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:22:02,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:22:02,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:02,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:02,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:22:03,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:03,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:03,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:03,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:03,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:03,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:03,284 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:22:03,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:22:03,464 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:22:03,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:22:03,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:22:03,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:22:03,892 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:22:07,445 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10990#(and (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (or (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcat_#t~post4#1.base|) |ULTIMATE.start_cstrcat_#t~post4#1.offset|) 0) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_cstrcat_#t~post5#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|)) (= |#NULL.base| 0)) (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (exists ((|v_ULTIMATE.start_cstrcat_#t~post4#1.offset_121| Int) (|v_ULTIMATE.start_cstrcat_#t~post4#1.base_122| Int)) (and (<= (+ |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_121| 1) (select |#length| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_122|)) (= (select |#valid| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_122|) 1) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.base_122|) (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_122|) |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_121|) 0)) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_121|))) (<= 1 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|))' at error location [2021-11-25 19:22:07,445 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:22:07,445 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:22:07,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 15] total 41 [2021-11-25 19:22:07,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9510862] [2021-11-25 19:22:07,446 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:22:07,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 19:22:07,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:22:07,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 19:22:07,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=2731, Unknown=43, NotChecked=0, Total=2970 [2021-11-25 19:22:07,447 INFO L87 Difference]: Start difference. First operand 258 states and 310 transitions. Second operand has 41 states, 41 states have (on average 1.8780487804878048) internal successors, (77), 41 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:08,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:22:08,485 INFO L93 Difference]: Finished difference Result 301 states and 353 transitions. [2021-11-25 19:22:08,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 19:22:08,485 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.8780487804878048) internal successors, (77), 41 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-25 19:22:08,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:22:08,487 INFO L225 Difference]: With dead ends: 301 [2021-11-25 19:22:08,488 INFO L226 Difference]: Without dead ends: 265 [2021-11-25 19:22:08,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1283 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=471, Invalid=5336, Unknown=45, NotChecked=0, Total=5852 [2021-11-25 19:22:08,489 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 67 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 172 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:22:08,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 192 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 339 Invalid, 0 Unknown, 172 Unchecked, 0.2s Time] [2021-11-25 19:22:08,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-25 19:22:08,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 257. [2021-11-25 19:22:08,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 254 states have (on average 1.1929133858267718) internal successors, (303), 256 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:08,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 303 transitions. [2021-11-25 19:22:08,498 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 303 transitions. Word has length 30 [2021-11-25 19:22:08,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:22:08,499 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 303 transitions. [2021-11-25 19:22:08,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.8780487804878048) internal successors, (77), 41 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:08,499 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 303 transitions. [2021-11-25 19:22:08,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 19:22:08,500 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:22:08,501 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:22:08,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 19:22:08,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-25 19:22:08,720 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:22:08,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:22:08,720 INFO L85 PathProgramCache]: Analyzing trace with hash -1698516672, now seen corresponding path program 6 times [2021-11-25 19:22:08,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:22:08,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149970216] [2021-11-25 19:22:08,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:22:08,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:22:08,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:22:09,464 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:22:09,465 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:22:09,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149970216] [2021-11-25 19:22:09,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149970216] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:22:09,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558383111] [2021-11-25 19:22:09,465 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:22:09,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:22:09,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:22:09,469 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:22:09,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 19:22:09,616 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:22:09,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:22:09,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-25 19:22:09,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:22:09,637 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:22:09,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:22:09,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:22:09,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:09,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:22:10,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:22:10,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:22:11,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:22:11,350 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:22:11,351 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 7 [2021-11-25 19:22:11,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:22:11,363 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 14 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:22:11,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:22:18,273 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:22:18,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2021-11-25 19:22:18,280 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:22:18,280 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 33 treesize of output 33 [2021-11-25 19:22:18,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-25 19:22:18,944 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 24 refuted. 5 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:22:18,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558383111] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:22:18,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1848270811] [2021-11-25 19:22:18,946 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:22:18,946 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:22:18,947 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:22:18,947 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:22:18,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:22:18,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:18,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:18,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:22:19,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:22:19,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:19,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:19,152 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 14 treesize of output 10 [2021-11-25 19:22:19,208 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:22:19,208 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 19:22:19,329 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:22:19,330 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:22:19,358 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:22:19,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:22:19,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:22:19,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:22:19,647 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:22:22,257 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11846#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:22:22,258 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:22:22,258 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:22:22,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 17, 17] total 52 [2021-11-25 19:22:22,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034325411] [2021-11-25 19:22:22,258 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:22:22,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-25 19:22:22,259 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:22:22,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-25 19:22:22,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=3880, Unknown=25, NotChecked=0, Total=4160 [2021-11-25 19:22:22,260 INFO L87 Difference]: Start difference. First operand 257 states and 303 transitions. Second operand has 52 states, 52 states have (on average 1.6538461538461537) internal successors, (86), 52 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:39,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:22:39,195 INFO L93 Difference]: Finished difference Result 305 states and 360 transitions. [2021-11-25 19:22:39,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 19:22:39,196 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.6538461538461537) internal successors, (86), 52 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-25 19:22:39,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:22:39,197 INFO L225 Difference]: With dead ends: 305 [2021-11-25 19:22:39,197 INFO L226 Difference]: Without dead ends: 285 [2021-11-25 19:22:39,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2059 ImplicationChecksByTransitivity, 27.9s TimeCoverageRelationStatistics Valid=606, Invalid=7739, Unknown=27, NotChecked=0, Total=8372 [2021-11-25 19:22:39,199 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 106 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 504 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 109 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:22:39,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 181 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 504 Invalid, 0 Unknown, 109 Unchecked, 0.3s Time] [2021-11-25 19:22:39,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-25 19:22:39,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 284. [2021-11-25 19:22:39,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 281 states have (on average 1.1921708185053381) internal successors, (335), 283 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:39,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 335 transitions. [2021-11-25 19:22:39,208 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 335 transitions. Word has length 32 [2021-11-25 19:22:39,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:22:39,208 INFO L470 AbstractCegarLoop]: Abstraction has 284 states and 335 transitions. [2021-11-25 19:22:39,208 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.6538461538461537) internal successors, (86), 52 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:39,208 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 335 transitions. [2021-11-25 19:22:39,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 19:22:39,209 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:22:39,210 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:22:39,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 19:22:39,424 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-25 19:22:39,425 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:22:39,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:22:39,425 INFO L85 PathProgramCache]: Analyzing trace with hash 715222831, now seen corresponding path program 2 times [2021-11-25 19:22:39,425 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:22:39,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107787866] [2021-11-25 19:22:39,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:22:39,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:22:39,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:22:39,740 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:22:39,740 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:22:39,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107787866] [2021-11-25 19:22:39,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107787866] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:22:39,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948165591] [2021-11-25 19:22:39,741 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:22:39,741 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:22:39,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:22:39,742 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:22:39,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 19:22:39,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 19:22:39,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:22:39,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-25 19:22:39,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:22:39,939 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:22:39,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:22:40,506 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 9 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:22:40,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:22:41,187 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 17 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:22:41,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948165591] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:22:41,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1977092493] [2021-11-25 19:22:41,188 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:22:41,188 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:22:41,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:22:41,189 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:22:41,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:22:41,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:41,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:41,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:22:41,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:41,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:41,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:41,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:41,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:41,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:41,523 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:22:41,524 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 19:22:41,709 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:22:41,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:22:41,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:22:41,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:22:42,150 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:22:45,510 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12743#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:22:45,510 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:22:45,510 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:22:45,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 46 [2021-11-25 19:22:45,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960315568] [2021-11-25 19:22:45,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:22:45,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-25 19:22:45,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:22:45,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-25 19:22:45,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=3327, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 19:22:45,515 INFO L87 Difference]: Start difference. First operand 284 states and 335 transitions. Second operand has 47 states, 46 states have (on average 2.108695652173913) internal successors, (97), 47 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:50,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:22:50,074 INFO L93 Difference]: Finished difference Result 553 states and 602 transitions. [2021-11-25 19:22:50,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-25 19:22:50,075 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 2.108695652173913) internal successors, (97), 47 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-25 19:22:50,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:22:50,077 INFO L225 Difference]: With dead ends: 553 [2021-11-25 19:22:50,077 INFO L226 Difference]: Without dead ends: 507 [2021-11-25 19:22:50,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3245 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=2129, Invalid=11443, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 19:22:50,080 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 838 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 1639 mSolverCounterSat, 233 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 838 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 1872 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 233 IncrementalHoareTripleChecker+Valid, 1639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:22:50,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [838 Valid, 296 Invalid, 1872 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [233 Valid, 1639 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:22:50,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2021-11-25 19:22:50,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 304. [2021-11-25 19:22:50,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 301 states have (on average 1.1627906976744187) internal successors, (350), 303 states have internal predecessors, (350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:50,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 350 transitions. [2021-11-25 19:22:50,092 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 350 transitions. Word has length 33 [2021-11-25 19:22:50,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:22:50,092 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 350 transitions. [2021-11-25 19:22:50,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 2.108695652173913) internal successors, (97), 47 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:50,093 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 350 transitions. [2021-11-25 19:22:50,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 19:22:50,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:22:50,094 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:22:50,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-25 19:22:50,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:22:50,309 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:22:50,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:22:50,309 INFO L85 PathProgramCache]: Analyzing trace with hash 1465759397, now seen corresponding path program 7 times [2021-11-25 19:22:50,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:22:50,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417250741] [2021-11-25 19:22:50,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:22:50,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:22:50,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:22:50,554 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:22:50,554 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:22:50,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417250741] [2021-11-25 19:22:50,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417250741] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:22:50,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861026941] [2021-11-25 19:22:50,555 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:22:50,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:22:50,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:22:50,557 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:22:50,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 19:22:50,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:22:50,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-25 19:22:50,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:22:50,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:50,902 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 15 treesize of output 7 [2021-11-25 19:22:50,916 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:22:50,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:22:50,971 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 15 treesize of output 13 [2021-11-25 19:22:50,972 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 26 treesize of output 22 [2021-11-25 19:22:51,092 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:22:51,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861026941] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:22:51,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [198828742] [2021-11-25 19:22:51,094 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:22:51,094 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:22:51,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:22:51,095 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:22:51,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:22:51,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:51,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:51,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:22:51,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:51,231 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 14 treesize of output 10 [2021-11-25 19:22:51,258 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 14 treesize of output 10 [2021-11-25 19:22:51,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:51,351 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:22:51,351 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 19:22:51,482 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:22:52,585 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13945#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:22:52,585 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:22:52,585 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:22:52,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 27 [2021-11-25 19:22:52,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275788593] [2021-11-25 19:22:52,585 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:22:52,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 19:22:52,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:22:52,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 19:22:52,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1077, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 19:22:52,587 INFO L87 Difference]: Start difference. First operand 304 states and 350 transitions. Second operand has 27 states, 27 states have (on average 1.7777777777777777) internal successors, (48), 27 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:53,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:22:53,300 INFO L93 Difference]: Finished difference Result 654 states and 716 transitions. [2021-11-25 19:22:53,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 19:22:53,300 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.7777777777777777) internal successors, (48), 27 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-25 19:22:53,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:22:53,304 INFO L225 Difference]: With dead ends: 654 [2021-11-25 19:22:53,304 INFO L226 Difference]: Without dead ends: 618 [2021-11-25 19:22:53,304 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=239, Invalid=1923, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 19:22:53,305 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 249 mSDsluCounter, 473 mSDsCounter, 0 mSdLazyCounter, 723 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 483 SdHoareTripleChecker+Invalid, 868 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 723 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 66 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:22:53,305 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [249 Valid, 483 Invalid, 868 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 723 Invalid, 0 Unknown, 66 Unchecked, 0.4s Time] [2021-11-25 19:22:53,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2021-11-25 19:22:53,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 322. [2021-11-25 19:22:53,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 319 states have (on average 1.1630094043887147) internal successors, (371), 321 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:53,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 371 transitions. [2021-11-25 19:22:53,318 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 371 transitions. Word has length 33 [2021-11-25 19:22:53,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:22:53,318 INFO L470 AbstractCegarLoop]: Abstraction has 322 states and 371 transitions. [2021-11-25 19:22:53,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.7777777777777777) internal successors, (48), 27 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:53,319 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 371 transitions. [2021-11-25 19:22:53,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 19:22:53,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:22:53,320 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:22:53,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 19:22:53,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:22:53,541 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:22:53,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:22:53,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1881385518, now seen corresponding path program 7 times [2021-11-25 19:22:53,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:22:53,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953712052] [2021-11-25 19:22:53,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:22:53,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:22:53,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:22:53,816 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:22:53,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:22:53,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953712052] [2021-11-25 19:22:53,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1953712052] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:22:53,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873955670] [2021-11-25 19:22:53,817 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:22:53,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:22:53,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:22:53,825 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:22:53,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 19:22:53,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:22:53,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 19:22:53,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:22:54,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:54,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:22:54,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:22:54,475 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 9 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:22:54,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:22:55,005 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:22:55,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873955670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:22:55,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1800892575] [2021-11-25 19:22:55,007 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:22:55,007 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:22:55,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:22:55,007 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:22:55,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:22:55,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:55,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:22:55,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:22:55,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:55,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:55,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:55,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:22:55,256 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:22:55,257 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 19:22:55,384 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:22:55,385 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:22:55,415 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:22:55,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:22:55,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:22:55,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:22:55,761 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:22:58,448 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15190#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:22:58,449 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:22:58,449 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:22:58,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 38 [2021-11-25 19:22:58,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606154114] [2021-11-25 19:22:58,450 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:22:58,450 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-25 19:22:58,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:22:58,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-25 19:22:58,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=2409, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 19:22:58,451 INFO L87 Difference]: Start difference. First operand 322 states and 371 transitions. Second operand has 39 states, 38 states have (on average 2.6315789473684212) internal successors, (100), 39 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:59,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:22:59,759 INFO L93 Difference]: Finished difference Result 473 states and 529 transitions. [2021-11-25 19:22:59,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 19:22:59,759 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.6315789473684212) internal successors, (100), 39 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-25 19:22:59,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:22:59,761 INFO L225 Difference]: With dead ends: 473 [2021-11-25 19:22:59,761 INFO L226 Difference]: Without dead ends: 473 [2021-11-25 19:22:59,762 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1164 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=724, Invalid=4678, Unknown=0, NotChecked=0, Total=5402 [2021-11-25 19:22:59,762 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 463 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 817 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 463 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 817 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:22:59,763 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [463 Valid, 147 Invalid, 859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 817 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:22:59,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2021-11-25 19:22:59,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 362. [2021-11-25 19:22:59,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 359 states have (on average 1.1782729805013927) internal successors, (423), 361 states have internal predecessors, (423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:59,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 423 transitions. [2021-11-25 19:22:59,774 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 423 transitions. Word has length 34 [2021-11-25 19:22:59,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:22:59,774 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 423 transitions. [2021-11-25 19:22:59,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.6315789473684212) internal successors, (100), 39 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:59,775 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 423 transitions. [2021-11-25 19:22:59,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 19:22:59,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:22:59,776 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:22:59,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 19:22:59,988 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:22:59,989 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:22:59,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:22:59,989 INFO L85 PathProgramCache]: Analyzing trace with hash 476682822, now seen corresponding path program 8 times [2021-11-25 19:22:59,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:22:59,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989353265] [2021-11-25 19:22:59,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:22:59,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:23:00,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:23:00,297 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 42 proven. 55 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:23:00,297 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:23:00,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989353265] [2021-11-25 19:23:00,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989353265] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:23:00,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230034490] [2021-11-25 19:23:00,298 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:23:00,298 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:23:00,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:23:00,301 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:23:00,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 19:23:00,517 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-25 19:23:00,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:23:00,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-25 19:23:00,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:23:00,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:00,762 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 15 treesize of output 7 [2021-11-25 19:23:00,774 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 42 proven. 55 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:23:00,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:23:00,833 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 15 treesize of output 13 [2021-11-25 19:23:00,835 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 26 treesize of output 22 [2021-11-25 19:23:00,957 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 42 proven. 55 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:23:00,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230034490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:23:00,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [159721378] [2021-11-25 19:23:00,959 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:23:00,959 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:23:00,959 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:23:00,959 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:23:00,960 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:23:01,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:01,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:01,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:23:01,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:01,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:01,133 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 14 treesize of output 10 [2021-11-25 19:23:01,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:01,266 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:23:01,267 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 19:23:01,382 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:23:02,435 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16316#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:23:02,435 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:23:02,435 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:23:02,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 30 [2021-11-25 19:23:02,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975225281] [2021-11-25 19:23:02,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:23:02,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-25 19:23:02,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:23:02,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-25 19:23:02,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1285, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 19:23:02,437 INFO L87 Difference]: Start difference. First operand 362 states and 423 transitions. Second operand has 30 states, 30 states have (on average 1.8) internal successors, (54), 30 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:03,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:23:03,365 INFO L93 Difference]: Finished difference Result 916 states and 1007 transitions. [2021-11-25 19:23:03,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 19:23:03,374 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.8) internal successors, (54), 30 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-25 19:23:03,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:23:03,379 INFO L225 Difference]: With dead ends: 916 [2021-11-25 19:23:03,379 INFO L226 Difference]: Without dead ends: 888 [2021-11-25 19:23:03,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 82 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=266, Invalid=2386, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 19:23:03,380 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 293 mSDsluCounter, 791 mSDsCounter, 0 mSdLazyCounter, 1183 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 787 SdHoareTripleChecker+Invalid, 1269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 1183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:23:03,381 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 787 Invalid, 1269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 1183 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:23:03,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 888 states. [2021-11-25 19:23:03,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 888 to 414. [2021-11-25 19:23:03,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 414 states, 411 states have (on average 1.1849148418491484) internal successors, (487), 413 states have internal predecessors, (487), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:03,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 487 transitions. [2021-11-25 19:23:03,395 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 487 transitions. Word has length 35 [2021-11-25 19:23:03,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:23:03,396 INFO L470 AbstractCegarLoop]: Abstraction has 414 states and 487 transitions. [2021-11-25 19:23:03,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.8) internal successors, (54), 30 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:03,396 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 487 transitions. [2021-11-25 19:23:03,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 19:23:03,397 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:23:03,398 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:23:03,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 19:23:03,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:23:03,621 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:23:03,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:23:03,621 INFO L85 PathProgramCache]: Analyzing trace with hash -303989623, now seen corresponding path program 4 times [2021-11-25 19:23:03,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:23:03,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539663895] [2021-11-25 19:23:03,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:23:03,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:23:03,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:23:04,070 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 8 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:23:04,070 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:23:04,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539663895] [2021-11-25 19:23:04,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1539663895] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:23:04,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700622994] [2021-11-25 19:23:04,071 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:23:04,071 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:23:04,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:23:04,072 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:23:04,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 19:23:04,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:23:04,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-25 19:23:04,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:23:04,222 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:23:04,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:23:04,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:04,586 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:23:04,587 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 17 treesize of output 23 [2021-11-25 19:23:04,594 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 8 treesize of output 3 [2021-11-25 19:23:04,981 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:23:04,982 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 21 treesize of output 27 [2021-11-25 19:23:05,388 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:23:05,389 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 21 treesize of output 27 [2021-11-25 19:23:05,767 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:23:05,767 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 21 treesize of output 27 [2021-11-25 19:23:06,101 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:06,103 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:23:06,103 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 24 treesize of output 14 [2021-11-25 19:23:06,284 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:23:06,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:23:07,311 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:23:07,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:23:07,318 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:23:07,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:23:07,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:08,005 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 1 proven. 41 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:23:08,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700622994] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:23:08,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1704502025] [2021-11-25 19:23:08,007 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:23:08,007 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:23:08,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:23:08,008 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:23:08,008 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:23:08,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:08,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:08,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:23:08,112 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 14 treesize of output 10 [2021-11-25 19:23:08,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:08,198 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 14 treesize of output 10 [2021-11-25 19:23:08,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:08,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:08,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:08,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:08,387 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:23:08,387 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 19:23:08,583 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:23:08,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:23:08,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:08,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:09,029 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:23:13,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17953#(and (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (or (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcat_#t~post4#1.base|) |ULTIMATE.start_cstrcat_#t~post4#1.offset|) 0) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_cstrcat_#t~post5#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|)) (= |#NULL.base| 0)) (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= 1 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_cstrcat_#t~post4#1.base_170| Int) (|v_ULTIMATE.start_cstrcat_#t~post4#1.offset_169| Int)) (and (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.base_170|) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_169|) (= (select |#valid| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_170|) 1) (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_170|) |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_169|) 0)) (<= (+ |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_169| 1) (select |#length| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_170|)))) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))))' at error location [2021-11-25 19:23:13,630 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:23:13,631 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:23:13,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 61 [2021-11-25 19:23:13,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925869779] [2021-11-25 19:23:13,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:23:13,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-25 19:23:13,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:23:13,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-25 19:23:13,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=5267, Unknown=2, NotChecked=0, Total=5550 [2021-11-25 19:23:13,632 INFO L87 Difference]: Start difference. First operand 414 states and 487 transitions. Second operand has 61 states, 61 states have (on average 1.6885245901639345) internal successors, (103), 61 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:17,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:23:17,283 INFO L93 Difference]: Finished difference Result 546 states and 623 transitions. [2021-11-25 19:23:17,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 19:23:17,284 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.6885245901639345) internal successors, (103), 61 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-25 19:23:17,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:23:17,286 INFO L225 Difference]: With dead ends: 546 [2021-11-25 19:23:17,286 INFO L226 Difference]: Without dead ends: 492 [2021-11-25 19:23:17,287 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2258 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=611, Invalid=11377, Unknown=2, NotChecked=0, Total=11990 [2021-11-25 19:23:17,287 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 127 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 1132 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 1790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 1132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 633 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:23:17,287 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 212 Invalid, 1790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 1132 Invalid, 0 Unknown, 633 Unchecked, 0.6s Time] [2021-11-25 19:23:17,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-11-25 19:23:17,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 419. [2021-11-25 19:23:17,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 419 states, 416 states have (on average 1.1610576923076923) internal successors, (483), 418 states have internal predecessors, (483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:17,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 483 transitions. [2021-11-25 19:23:17,298 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 483 transitions. Word has length 36 [2021-11-25 19:23:17,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:23:17,298 INFO L470 AbstractCegarLoop]: Abstraction has 419 states and 483 transitions. [2021-11-25 19:23:17,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.6885245901639345) internal successors, (103), 61 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:17,299 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 483 transitions. [2021-11-25 19:23:17,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 19:23:17,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:23:17,300 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:23:17,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-25 19:23:17,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-25 19:23:17,513 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:23:17,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:23:17,513 INFO L85 PathProgramCache]: Analyzing trace with hash 707306453, now seen corresponding path program 3 times [2021-11-25 19:23:17,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:23:17,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502829484] [2021-11-25 19:23:17,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:23:17,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:23:17,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:23:17,806 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 1 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:23:17,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:23:17,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502829484] [2021-11-25 19:23:17,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502829484] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:23:17,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611302595] [2021-11-25 19:23:17,807 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:23:17,807 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:23:17,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:23:17,809 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:23:17,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 19:23:17,953 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:23:17,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:23:17,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-25 19:23:17,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:23:17,978 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:23:17,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:23:17,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:23:18,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:18,203 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:23:18,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-11-25 19:23:18,794 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 19:23:18,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:23:19,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2021-11-25 19:23:19,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-25 19:23:19,774 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 19:23:19,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611302595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:23:19,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [222771540] [2021-11-25 19:23:19,776 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:23:19,776 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:23:19,776 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:23:19,776 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:23:19,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:23:19,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:19,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:19,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:23:19,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:19,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:19,923 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 14 treesize of output 10 [2021-11-25 19:23:19,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:20,017 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 14 treesize of output 10 [2021-11-25 19:23:20,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:20,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:20,105 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:23:20,105 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 19:23:20,313 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:23:20,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:23:20,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:20,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:20,640 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:23:24,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19256#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:23:24,084 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:23:24,084 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:23:24,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 37 [2021-11-25 19:23:24,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771198564] [2021-11-25 19:23:24,084 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:23:24,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 19:23:24,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:23:24,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 19:23:24,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 19:23:24,085 INFO L87 Difference]: Start difference. First operand 419 states and 483 transitions. Second operand has 38 states, 37 states have (on average 2.6216216216216215) internal successors, (97), 38 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:28,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:23:28,262 INFO L93 Difference]: Finished difference Result 679 states and 748 transitions. [2021-11-25 19:23:28,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-25 19:23:28,262 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 2.6216216216216215) internal successors, (97), 38 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-25 19:23:28,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:23:28,265 INFO L225 Difference]: With dead ends: 679 [2021-11-25 19:23:28,265 INFO L226 Difference]: Without dead ends: 631 [2021-11-25 19:23:28,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2812 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1135, Invalid=11521, Unknown=0, NotChecked=0, Total=12656 [2021-11-25 19:23:28,266 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 124 mSDsluCounter, 382 mSDsCounter, 0 mSdLazyCounter, 2021 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 386 SdHoareTripleChecker+Invalid, 2306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 2021 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 200 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:23:28,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 386 Invalid, 2306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 2021 Invalid, 0 Unknown, 200 Unchecked, 1.0s Time] [2021-11-25 19:23:28,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2021-11-25 19:23:28,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 433. [2021-11-25 19:23:28,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 430 states have (on average 1.1651162790697673) internal successors, (501), 432 states have internal predecessors, (501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:28,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 501 transitions. [2021-11-25 19:23:28,276 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 501 transitions. Word has length 37 [2021-11-25 19:23:28,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:23:28,276 INFO L470 AbstractCegarLoop]: Abstraction has 433 states and 501 transitions. [2021-11-25 19:23:28,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 2.6216216216216215) internal successors, (97), 38 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:28,277 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 501 transitions. [2021-11-25 19:23:28,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 19:23:28,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:23:28,278 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:23:28,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 19:23:28,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-25 19:23:28,500 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:23:28,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:23:28,500 INFO L85 PathProgramCache]: Analyzing trace with hash -838133337, now seen corresponding path program 9 times [2021-11-25 19:23:28,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:23:28,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566554073] [2021-11-25 19:23:28,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:23:28,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:23:28,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:23:28,787 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 35 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:23:28,787 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:23:28,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566554073] [2021-11-25 19:23:28,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566554073] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:23:28,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901588767] [2021-11-25 19:23:28,787 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:23:28,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:23:28,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:23:28,788 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:23:28,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 19:23:28,904 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:23:28,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:23:28,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-25 19:23:28,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:23:29,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:29,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:29,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:29,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:29,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:29,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:29,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:29,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:30,068 INFO L354 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2021-11-25 19:23:30,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 21 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 78 treesize of output 58 [2021-11-25 19:23:30,084 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 35 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:23:30,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:23:30,798 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 104 treesize of output 90 [2021-11-25 19:23:30,810 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,810 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,811 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,811 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,812 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,813 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,813 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,814 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,814 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,815 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,816 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,817 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,817 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,818 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,818 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,819 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,819 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,820 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,821 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,823 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:30,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 170 treesize of output 144 [2021-11-25 19:23:31,617 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 77 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:23:31,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901588767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:23:31,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [422067923] [2021-11-25 19:23:31,619 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:23:31,619 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:23:31,619 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:23:31,619 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:23:31,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:23:31,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:31,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:31,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:23:31,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:31,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:31,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:31,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:31,892 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:23:31,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:23:32,001 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:23:33,393 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20782#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:23:33,393 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:23:33,393 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:23:33,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 25, 25] total 62 [2021-11-25 19:23:33,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033955760] [2021-11-25 19:23:33,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:23:33,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-25 19:23:33,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:23:33,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-25 19:23:33,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=4350, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 19:23:33,395 INFO L87 Difference]: Start difference. First operand 433 states and 501 transitions. Second operand has 62 states, 62 states have (on average 1.5) internal successors, (93), 62 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:34,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:23:34,744 INFO L93 Difference]: Finished difference Result 528 states and 609 transitions. [2021-11-25 19:23:34,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-25 19:23:34,745 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.5) internal successors, (93), 62 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-25 19:23:34,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:23:34,747 INFO L225 Difference]: With dead ends: 528 [2021-11-25 19:23:34,747 INFO L226 Difference]: Without dead ends: 512 [2021-11-25 19:23:34,748 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2704 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=873, Invalid=8247, Unknown=0, NotChecked=0, Total=9120 [2021-11-25 19:23:34,748 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 159 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 784 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 269 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:23:34,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 168 Invalid, 784 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 501 Invalid, 0 Unknown, 269 Unchecked, 0.3s Time] [2021-11-25 19:23:34,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 512 states. [2021-11-25 19:23:34,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 512 to 507. [2021-11-25 19:23:34,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 507 states, 504 states have (on average 1.1666666666666667) internal successors, (588), 506 states have internal predecessors, (588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:34,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 588 transitions. [2021-11-25 19:23:34,759 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 588 transitions. Word has length 37 [2021-11-25 19:23:34,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:23:34,760 INFO L470 AbstractCegarLoop]: Abstraction has 507 states and 588 transitions. [2021-11-25 19:23:34,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.5) internal successors, (93), 62 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:34,760 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 588 transitions. [2021-11-25 19:23:34,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 19:23:34,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:23:34,762 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:23:34,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 19:23:34,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:23:34,977 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:23:34,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:23:34,977 INFO L85 PathProgramCache]: Analyzing trace with hash 81104054, now seen corresponding path program 8 times [2021-11-25 19:23:34,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:23:34,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308451708] [2021-11-25 19:23:34,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:23:34,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:23:35,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:23:35,591 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:23:35,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:23:35,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308451708] [2021-11-25 19:23:35,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308451708] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:23:35,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759956404] [2021-11-25 19:23:35,592 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:23:35,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:23:35,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:23:35,597 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:23:35,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 19:23:35,833 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 19:23:35,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:23:35,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-25 19:23:35,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:23:35,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:23:36,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:36,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:23:36,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:23:36,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:23:36,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:23:36,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:23:36,428 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 15 treesize of output 7 [2021-11-25 19:23:36,435 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:23:36,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:23:36,451 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1311 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_1311) |c_ULTIMATE.start_cstrcat_~append#1.base|) |c_ULTIMATE.start_cstrcat_~append#1.offset|) 0)) is different from false [2021-11-25 19:23:36,458 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1311 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_1311) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:23:36,466 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1311 (Array Int Int)) (v_ArrVal_1310 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_1310) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_1311) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:23:36,474 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1311 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_1311) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 2 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:23:36,481 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1311 (Array Int Int)) (v_ArrVal_1309 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_1309) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_1311) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 2 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:23:36,490 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1311 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_1311) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 3 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:23:36,498 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1311 (Array Int Int)) (v_ArrVal_1308 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_1308) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_1311) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 3 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:23:36,505 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1311 (Array Int Int))) (= 0 (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_1311) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 4)))) is different from false [2021-11-25 19:23:36,515 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1311 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1311) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 4)) 0)) is different from false [2021-11-25 19:23:36,523 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:23:36,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:23:36,529 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:23:36,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:23:36,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:36,723 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 39 not checked. [2021-11-25 19:23:36,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759956404] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:23:36,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1150295184] [2021-11-25 19:23:36,724 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:23:36,724 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:23:36,724 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:23:36,725 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:23:36,725 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:23:36,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:36,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:36,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:23:36,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:36,849 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 14 treesize of output 10 [2021-11-25 19:23:36,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:36,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:36,965 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:23:36,965 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 19:23:37,113 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:37,117 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:37,156 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:23:37,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:23:37,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:37,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:37,439 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:23:39,844 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22147#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:23:39,844 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:23:39,844 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:23:39,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 21, 21] total 48 [2021-11-25 19:23:39,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513530701] [2021-11-25 19:23:39,845 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:23:39,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 19:23:39,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:23:39,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 19:23:39,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=2488, Unknown=9, NotChecked=972, Total=3660 [2021-11-25 19:23:39,846 INFO L87 Difference]: Start difference. First operand 507 states and 588 transitions. Second operand has 48 states, 48 states have (on average 1.7916666666666667) internal successors, (86), 48 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:40,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:23:40,951 INFO L93 Difference]: Finished difference Result 597 states and 692 transitions. [2021-11-25 19:23:40,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 19:23:40,951 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.7916666666666667) internal successors, (86), 48 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-25 19:23:40,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:23:40,954 INFO L225 Difference]: With dead ends: 597 [2021-11-25 19:23:40,954 INFO L226 Difference]: Without dead ends: 553 [2021-11-25 19:23:40,954 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 75 SyntacticMatches, 10 SemanticMatches, 70 ConstructedPredicates, 9 IntricatePredicates, 0 DeprecatedPredicates, 975 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=268, Invalid=3665, Unknown=9, NotChecked=1170, Total=5112 [2021-11-25 19:23:40,955 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 51 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 958 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 1720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 958 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 741 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:23:40,955 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 289 Invalid, 1720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 958 Invalid, 0 Unknown, 741 Unchecked, 0.5s Time] [2021-11-25 19:23:40,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-11-25 19:23:40,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 552. [2021-11-25 19:23:40,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 552 states, 549 states have (on average 1.1675774134790529) internal successors, (641), 551 states have internal predecessors, (641), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:40,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 552 states to 552 states and 641 transitions. [2021-11-25 19:23:40,965 INFO L78 Accepts]: Start accepts. Automaton has 552 states and 641 transitions. Word has length 38 [2021-11-25 19:23:40,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:23:40,966 INFO L470 AbstractCegarLoop]: Abstraction has 552 states and 641 transitions. [2021-11-25 19:23:40,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.7916666666666667) internal successors, (86), 48 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:40,966 INFO L276 IsEmpty]: Start isEmpty. Operand 552 states and 641 transitions. [2021-11-25 19:23:40,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 19:23:40,968 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:23:40,968 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:23:41,017 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-11-25 19:23:41,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-25 19:23:41,193 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:23:41,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:23:41,193 INFO L85 PathProgramCache]: Analyzing trace with hash -1656077112, now seen corresponding path program 10 times [2021-11-25 19:23:41,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:23:41,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630248137] [2021-11-25 19:23:41,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:23:41,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:23:41,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:23:41,548 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 24 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:23:41,548 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:23:41,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630248137] [2021-11-25 19:23:41,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630248137] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:23:41,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340491234] [2021-11-25 19:23:41,549 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:23:41,549 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:23:41,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:23:41,550 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:23:41,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 19:23:41,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:23:41,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 19:23:41,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:23:41,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:41,986 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 15 treesize of output 7 [2021-11-25 19:23:41,991 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 24 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:23:41,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:23:42,053 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 15 treesize of output 13 [2021-11-25 19:23:42,055 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 26 treesize of output 22 [2021-11-25 19:23:42,192 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 24 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:23:42,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340491234] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:23:42,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1442142266] [2021-11-25 19:23:42,193 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:23:42,193 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:23:42,193 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:23:42,193 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:23:42,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:23:42,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:42,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:42,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:23:42,283 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 11 treesize of output 7 [2021-11-25 19:23:42,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:42,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:42,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:42,470 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:23:42,470 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 19:23:42,597 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:23:43,727 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23602#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:23:43,728 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:23:43,728 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:23:43,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 36 [2021-11-25 19:23:43,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791760935] [2021-11-25 19:23:43,728 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:23:43,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 19:23:43,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:23:43,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 19:23:43,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1755, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 19:23:43,729 INFO L87 Difference]: Start difference. First operand 552 states and 641 transitions. Second operand has 36 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 36 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:45,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:23:45,231 INFO L93 Difference]: Finished difference Result 1380 states and 1522 transitions. [2021-11-25 19:23:45,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 19:23:45,231 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 36 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-25 19:23:45,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:23:45,236 INFO L225 Difference]: With dead ends: 1380 [2021-11-25 19:23:45,237 INFO L226 Difference]: Without dead ends: 1362 [2021-11-25 19:23:45,237 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 92 SyntacticMatches, 3 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 800 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=320, Invalid=3462, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 19:23:45,237 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 304 mSDsluCounter, 1539 mSDsCounter, 0 mSdLazyCounter, 2173 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 1500 SdHoareTripleChecker+Invalid, 2256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 2173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:23:45,238 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [304 Valid, 1500 Invalid, 2256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 2173 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:23:45,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1362 states. [2021-11-25 19:23:45,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1362 to 632. [2021-11-25 19:23:45,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 632 states, 629 states have (on average 1.1748807631160572) internal successors, (739), 631 states have internal predecessors, (739), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:45,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 632 states to 632 states and 739 transitions. [2021-11-25 19:23:45,258 INFO L78 Accepts]: Start accepts. Automaton has 632 states and 739 transitions. Word has length 39 [2021-11-25 19:23:45,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:23:45,259 INFO L470 AbstractCegarLoop]: Abstraction has 632 states and 739 transitions. [2021-11-25 19:23:45,259 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 36 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:45,259 INFO L276 IsEmpty]: Start isEmpty. Operand 632 states and 739 transitions. [2021-11-25 19:23:45,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 19:23:45,261 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:23:45,261 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:23:45,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 19:23:45,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-25 19:23:45,489 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:23:45,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:23:45,489 INFO L85 PathProgramCache]: Analyzing trace with hash -1985504476, now seen corresponding path program 9 times [2021-11-25 19:23:45,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:23:45,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121314815] [2021-11-25 19:23:45,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:23:45,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:23:45,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:23:45,782 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:23:45,783 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:23:45,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121314815] [2021-11-25 19:23:45,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121314815] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:23:45,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418529346] [2021-11-25 19:23:45,783 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:23:45,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:23:45,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:23:45,789 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:23:45,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 19:23:45,970 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:23:45,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:23:45,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-25 19:23:45,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:23:45,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:23:45,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:23:46,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:23:46,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:23:46,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:23:46,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:23:46,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:23:47,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:23:47,168 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:23:47,168 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 21 treesize of output 21 [2021-11-25 19:23:47,320 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 20 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:23:47,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:23:48,184 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1428 (Array Int Int)) (|v_ULTIMATE.start_cstrcat_#t~post5#1.offset_208| Int)) (or (< |c_ULTIMATE.start_cstrcat_~append#1.offset| |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_208|) (< |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_208| 0) (<= (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_208| 6) (select |c_#length| |c_ULTIMATE.start_cstrcat_~append#1.base|)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_1428) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_208| 4)) 0))) is different from false [2021-11-25 19:23:48,229 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1428 (Array Int Int)) (|v_ULTIMATE.start_cstrcat_#t~post5#1.offset_208| Int)) (or (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_208|) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1428) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_208| 4)) 0) (<= (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_208| 6) (select |c_#length| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (< |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_208| 0))) is different from false [2021-11-25 19:23:48,239 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:23:48,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:23:48,253 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:23:48,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:23:48,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:49,208 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 25 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2021-11-25 19:23:49,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418529346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:23:49,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [971658321] [2021-11-25 19:23:49,210 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:23:49,210 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:23:49,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:23:49,210 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:23:49,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:23:49,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:49,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:23:49,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:23:49,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:49,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:49,401 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 14 treesize of output 10 [2021-11-25 19:23:49,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:23:49,538 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:23:49,538 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 19:23:49,691 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:49,692 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:23:49,737 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:23:49,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:23:49,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:50,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:23:50,079 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:23:53,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25951#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:23:53,309 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:23:53,309 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:23:53,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 22, 22] total 58 [2021-11-25 19:23:53,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965846923] [2021-11-25 19:23:53,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:23:53,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-25 19:23:53,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:23:53,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-25 19:23:53,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=400, Invalid=4432, Unknown=6, NotChecked=274, Total=5112 [2021-11-25 19:23:53,326 INFO L87 Difference]: Start difference. First operand 632 states and 739 transitions. Second operand has 59 states, 58 states have (on average 2.0344827586206895) internal successors, (118), 59 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:59,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:23:59,677 INFO L93 Difference]: Finished difference Result 909 states and 1039 transitions. [2021-11-25 19:23:59,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-25 19:23:59,677 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 2.0344827586206895) internal successors, (118), 59 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 19:23:59,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:23:59,680 INFO L225 Difference]: With dead ends: 909 [2021-11-25 19:23:59,681 INFO L226 Difference]: Without dead ends: 909 [2021-11-25 19:23:59,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 69 SyntacticMatches, 4 SemanticMatches, 136 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 4038 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=2345, Invalid=15993, Unknown=30, NotChecked=538, Total=18906 [2021-11-25 19:23:59,682 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 579 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 1165 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 1934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 1165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 509 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:23:59,682 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [579 Valid, 279 Invalid, 1934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 1165 Invalid, 0 Unknown, 509 Unchecked, 0.8s Time] [2021-11-25 19:23:59,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 909 states. [2021-11-25 19:23:59,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 909 to 652. [2021-11-25 19:23:59,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 652 states, 649 states have (on average 1.1694915254237288) internal successors, (759), 651 states have internal predecessors, (759), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:59,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 652 states to 652 states and 759 transitions. [2021-11-25 19:23:59,697 INFO L78 Accepts]: Start accepts. Automaton has 652 states and 759 transitions. Word has length 40 [2021-11-25 19:23:59,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:23:59,697 INFO L470 AbstractCegarLoop]: Abstraction has 652 states and 759 transitions. [2021-11-25 19:23:59,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 58 states have (on average 2.0344827586206895) internal successors, (118), 59 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:23:59,698 INFO L276 IsEmpty]: Start isEmpty. Operand 652 states and 759 transitions. [2021-11-25 19:23:59,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 19:23:59,700 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:23:59,700 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:23:59,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 19:23:59,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-25 19:23:59,913 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:23:59,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:23:59,913 INFO L85 PathProgramCache]: Analyzing trace with hash -1421096581, now seen corresponding path program 3 times [2021-11-25 19:23:59,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:23:59,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1592867102] [2021-11-25 19:23:59,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:23:59,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:23:59,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:24:00,220 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 9 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:24:00,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:24:00,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1592867102] [2021-11-25 19:24:00,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1592867102] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:24:00,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259812393] [2021-11-25 19:24:00,220 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:24:00,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:24:00,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:24:00,221 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:24:00,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-25 19:24:00,372 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:24:00,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:24:00,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-25 19:24:00,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:24:00,393 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 10 treesize of output 8 [2021-11-25 19:24:00,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:24:01,060 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:24:01,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:24:01,846 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:24:01,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259812393] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:24:01,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1825730164] [2021-11-25 19:24:01,847 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:24:01,847 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:24:01,847 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:24:01,847 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:24:01,848 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:24:01,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:01,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:01,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:24:01,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:24:01,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:01,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:02,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:02,152 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:24:02,152 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 19:24:02,293 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:02,294 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:02,333 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:24:02,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:24:02,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:24:02,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:24:02,680 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:24:05,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27944#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= |ULTIMATE.start_main_~length3~0#1| 1) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:24:05,505 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:24:05,505 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:24:05,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 37 [2021-11-25 19:24:05,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477281349] [2021-11-25 19:24:05,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:24:05,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 19:24:05,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:24:05,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 19:24:05,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=2322, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 19:24:05,506 INFO L87 Difference]: Start difference. First operand 652 states and 759 transitions. Second operand has 38 states, 37 states have (on average 2.8378378378378377) internal successors, (105), 38 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:12,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:24:12,679 INFO L93 Difference]: Finished difference Result 915 states and 1051 transitions. [2021-11-25 19:24:12,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-25 19:24:12,680 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 2.8378378378378377) internal successors, (105), 38 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-25 19:24:12,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:24:12,684 INFO L225 Difference]: With dead ends: 915 [2021-11-25 19:24:12,685 INFO L226 Difference]: Without dead ends: 915 [2021-11-25 19:24:12,685 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4491 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=2521, Invalid=15301, Unknown=0, NotChecked=0, Total=17822 [2021-11-25 19:24:12,686 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 376 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 1496 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 376 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 1783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 1496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 128 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:24:12,686 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [376 Valid, 228 Invalid, 1783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 1496 Invalid, 0 Unknown, 128 Unchecked, 1.0s Time] [2021-11-25 19:24:12,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 915 states. [2021-11-25 19:24:12,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 915 to 656. [2021-11-25 19:24:12,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 656 states, 653 states have (on average 1.1715160796324655) internal successors, (765), 655 states have internal predecessors, (765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:12,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 656 states to 656 states and 765 transitions. [2021-11-25 19:24:12,702 INFO L78 Accepts]: Start accepts. Automaton has 656 states and 765 transitions. Word has length 41 [2021-11-25 19:24:12,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:24:12,702 INFO L470 AbstractCegarLoop]: Abstraction has 656 states and 765 transitions. [2021-11-25 19:24:12,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 2.8378378378378377) internal successors, (105), 38 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:12,703 INFO L276 IsEmpty]: Start isEmpty. Operand 656 states and 765 transitions. [2021-11-25 19:24:12,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 19:24:12,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:24:12,705 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:24:12,750 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-25 19:24:12,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2021-11-25 19:24:12,921 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:24:12,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:24:12,921 INFO L85 PathProgramCache]: Analyzing trace with hash -1369612387, now seen corresponding path program 4 times [2021-11-25 19:24:12,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:24:12,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759277643] [2021-11-25 19:24:12,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:24:12,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:24:12,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:24:13,398 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 16 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:24:13,398 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:24:13,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759277643] [2021-11-25 19:24:13,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759277643] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:24:13,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843439618] [2021-11-25 19:24:13,399 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:24:13,399 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:24:13,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:24:13,401 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:24:13,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-25 19:24:13,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:24:13,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 19:24:13,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:24:13,617 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:24:13,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:24:14,312 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 25 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:24:14,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:24:15,240 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 37 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:24:15,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843439618] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:24:15,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [235399043] [2021-11-25 19:24:15,241 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:24:15,242 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:24:15,242 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:24:15,242 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:24:15,242 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:24:15,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:15,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:15,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:24:15,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:24:15,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:15,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:15,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:24:15,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:15,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:15,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:15,714 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:24:15,714 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 19:24:15,964 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:24:15,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:24:16,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:24:16,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:24:16,368 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:24:20,022 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29992#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:24:20,023 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:24:20,023 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:24:20,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 57 [2021-11-25 19:24:20,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112684682] [2021-11-25 19:24:20,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:24:20,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-25 19:24:20,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:24:20,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-25 19:24:20,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=4681, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 19:24:20,025 INFO L87 Difference]: Start difference. First operand 656 states and 765 transitions. Second operand has 58 states, 57 states have (on average 2.1228070175438596) internal successors, (121), 58 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:26,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:24:26,774 INFO L93 Difference]: Finished difference Result 1418 states and 1552 transitions. [2021-11-25 19:24:26,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-25 19:24:26,774 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 2.1228070175438596) internal successors, (121), 58 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-25 19:24:26,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:24:26,779 INFO L225 Difference]: With dead ends: 1418 [2021-11-25 19:24:26,779 INFO L226 Difference]: Without dead ends: 1306 [2021-11-25 19:24:26,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5981 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=3845, Invalid=19107, Unknown=0, NotChecked=0, Total=22952 [2021-11-25 19:24:26,781 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 840 mSDsluCounter, 498 mSDsCounter, 0 mSdLazyCounter, 2476 mSolverCounterSat, 236 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 840 SdHoareTripleChecker+Valid, 516 SdHoareTripleChecker+Invalid, 2712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 236 IncrementalHoareTripleChecker+Valid, 2476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:24:26,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [840 Valid, 516 Invalid, 2712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [236 Valid, 2476 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-25 19:24:26,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1306 states. [2021-11-25 19:24:26,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1306 to 609. [2021-11-25 19:24:26,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 609 states, 606 states have (on average 1.1485148514851484) internal successors, (696), 608 states have internal predecessors, (696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:26,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 609 states to 609 states and 696 transitions. [2021-11-25 19:24:26,798 INFO L78 Accepts]: Start accepts. Automaton has 609 states and 696 transitions. Word has length 41 [2021-11-25 19:24:26,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:24:26,799 INFO L470 AbstractCegarLoop]: Abstraction has 609 states and 696 transitions. [2021-11-25 19:24:26,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 2.1228070175438596) internal successors, (121), 58 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:26,799 INFO L276 IsEmpty]: Start isEmpty. Operand 609 states and 696 transitions. [2021-11-25 19:24:26,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 19:24:26,801 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:24:26,801 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:24:26,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-25 19:24:27,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:24:27,021 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:24:27,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:24:27,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1721029719, now seen corresponding path program 11 times [2021-11-25 19:24:27,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:24:27,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629284854] [2021-11-25 19:24:27,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:24:27,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:24:27,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:24:27,442 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 36 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:24:27,442 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:24:27,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629284854] [2021-11-25 19:24:27,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629284854] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:24:27,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000827716] [2021-11-25 19:24:27,443 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:24:27,443 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:24:27,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:24:27,444 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:24:27,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 19:24:27,685 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-25 19:24:27,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:24:27,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-25 19:24:27,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:24:27,717 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:24:27,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:24:28,688 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 49 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:24:28,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:24:29,879 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 64 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:24:29,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000827716] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:24:29,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1459215021] [2021-11-25 19:24:29,880 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:24:29,881 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:24:29,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:24:29,881 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:24:29,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:24:29,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:29,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:29,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:24:29,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:30,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:30,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:30,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:30,153 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:24:30,153 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 19:24:30,283 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:24:31,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32500#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:24:31,678 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:24:31,678 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:24:31,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 66 [2021-11-25 19:24:31,678 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739840530] [2021-11-25 19:24:31,678 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:24:31,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-25 19:24:31,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:24:31,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-25 19:24:31,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=4945, Unknown=0, NotChecked=0, Total=5550 [2021-11-25 19:24:31,680 INFO L87 Difference]: Start difference. First operand 609 states and 696 transitions. Second operand has 67 states, 66 states have (on average 1.8333333333333333) internal successors, (121), 67 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:35,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:24:35,364 INFO L93 Difference]: Finished difference Result 1733 states and 1874 transitions. [2021-11-25 19:24:35,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 19:24:35,364 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.8333333333333333) internal successors, (121), 67 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-25 19:24:35,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:24:35,374 INFO L225 Difference]: With dead ends: 1733 [2021-11-25 19:24:35,374 INFO L226 Difference]: Without dead ends: 1733 [2021-11-25 19:24:35,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2610 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=2052, Invalid=9938, Unknown=0, NotChecked=0, Total=11990 [2021-11-25 19:24:35,375 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 713 mSDsluCounter, 473 mSDsCounter, 0 mSdLazyCounter, 2286 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 713 SdHoareTripleChecker+Valid, 497 SdHoareTripleChecker+Invalid, 2472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 2286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:24:35,375 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [713 Valid, 497 Invalid, 2472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 2286 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-25 19:24:35,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1733 states. [2021-11-25 19:24:35,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1733 to 619. [2021-11-25 19:24:35,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 619 states, 616 states have (on average 1.1525974025974026) internal successors, (710), 618 states have internal predecessors, (710), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:35,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 619 states to 619 states and 710 transitions. [2021-11-25 19:24:35,389 INFO L78 Accepts]: Start accepts. Automaton has 619 states and 710 transitions. Word has length 41 [2021-11-25 19:24:35,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:24:35,390 INFO L470 AbstractCegarLoop]: Abstraction has 619 states and 710 transitions. [2021-11-25 19:24:35,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 1.8333333333333333) internal successors, (121), 67 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:35,390 INFO L276 IsEmpty]: Start isEmpty. Operand 619 states and 710 transitions. [2021-11-25 19:24:35,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 19:24:35,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:24:35,392 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:24:35,426 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-25 19:24:35,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:24:35,621 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:24:35,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:24:35,621 INFO L85 PathProgramCache]: Analyzing trace with hash -347149345, now seen corresponding path program 12 times [2021-11-25 19:24:35,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:24:35,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182866347] [2021-11-25 19:24:35,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:24:35,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:24:35,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:24:36,074 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 27 proven. 136 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:24:36,074 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:24:36,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182866347] [2021-11-25 19:24:36,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182866347] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:24:36,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184266974] [2021-11-25 19:24:36,075 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:24:36,075 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:24:36,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:24:36,076 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:24:36,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-25 19:24:36,287 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:24:36,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:24:36,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-25 19:24:36,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:24:36,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:38,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:38,305 INFO L354 Elim1Store]: treesize reduction 80, result has 31.0 percent of original size [2021-11-25 19:24:38,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 36 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 98 treesize of output 74 [2021-11-25 19:24:38,340 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 27 proven. 136 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:24:38,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:24:39,722 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 134 treesize of output 116 [2021-11-25 19:24:39,739 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,739 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,740 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,741 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,742 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,742 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,743 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,744 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,744 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,745 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,746 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,748 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,749 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,749 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,750 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,751 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,751 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,752 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,753 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,754 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,754 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,755 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,756 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,756 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,757 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,758 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,758 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,759 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,760 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,760 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,761 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,761 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,761 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,762 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:24:39,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 36 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 220 treesize of output 186 [2021-11-25 19:24:40,860 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 99 proven. 64 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:24:40,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184266974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:24:40,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [589911693] [2021-11-25 19:24:40,861 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:24:40,862 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:24:40,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:24:40,862 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:24:40,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:24:40,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:40,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:40,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:24:40,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:24:41,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:41,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:41,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:41,189 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:24:41,190 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 19:24:41,331 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:24:43,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35260#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:24:43,035 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:24:43,035 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:24:43,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 31, 31] total 78 [2021-11-25 19:24:43,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764791104] [2021-11-25 19:24:43,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:24:43,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-25 19:24:43,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:24:43,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-25 19:24:43,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=708, Invalid=6602, Unknown=0, NotChecked=0, Total=7310 [2021-11-25 19:24:43,037 INFO L87 Difference]: Start difference. First operand 619 states and 710 transitions. Second operand has 78 states, 78 states have (on average 1.5) internal successors, (117), 78 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:45,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:24:45,606 INFO L93 Difference]: Finished difference Result 773 states and 883 transitions. [2021-11-25 19:24:45,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-25 19:24:45,606 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.5) internal successors, (117), 78 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-25 19:24:45,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:24:45,609 INFO L225 Difference]: With dead ends: 773 [2021-11-25 19:24:45,610 INFO L226 Difference]: Without dead ends: 753 [2021-11-25 19:24:45,611 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4339 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1304, Invalid=13216, Unknown=0, NotChecked=0, Total=14520 [2021-11-25 19:24:45,611 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 200 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 746 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 746 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 210 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:24:45,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 211 Invalid, 979 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 746 Invalid, 0 Unknown, 210 Unchecked, 0.5s Time] [2021-11-25 19:24:45,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 753 states. [2021-11-25 19:24:45,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 753 to 715. [2021-11-25 19:24:45,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 715 states, 712 states have (on average 1.154494382022472) internal successors, (822), 714 states have internal predecessors, (822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:45,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 715 states to 715 states and 822 transitions. [2021-11-25 19:24:45,625 INFO L78 Accepts]: Start accepts. Automaton has 715 states and 822 transitions. Word has length 43 [2021-11-25 19:24:45,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:24:45,625 INFO L470 AbstractCegarLoop]: Abstraction has 715 states and 822 transitions. [2021-11-25 19:24:45,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 1.5) internal successors, (117), 78 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:24:45,626 INFO L276 IsEmpty]: Start isEmpty. Operand 715 states and 822 transitions. [2021-11-25 19:24:45,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 19:24:45,628 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:24:45,628 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:24:45,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-25 19:24:45,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:24:45,845 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:24:45,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:24:45,845 INFO L85 PathProgramCache]: Analyzing trace with hash -703665341, now seen corresponding path program 5 times [2021-11-25 19:24:45,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:24:45,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590488669] [2021-11-25 19:24:45,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:24:45,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:24:45,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:24:46,226 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 5 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:24:46,227 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:24:46,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590488669] [2021-11-25 19:24:46,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [590488669] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:24:46,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708797653] [2021-11-25 19:24:46,228 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:24:46,228 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:24:46,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:24:46,228 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:24:46,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-25 19:24:46,563 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 19:24:46,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:24:46,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-25 19:24:46,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:24:46,589 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:24:46,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:24:47,368 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 13 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:24:47,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:24:48,473 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 25 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:24:48,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708797653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:24:48,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [635504153] [2021-11-25 19:24:48,474 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:24:48,474 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:24:48,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:24:48,474 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:24:48,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:24:48,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:48,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:24:48,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:24:48,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:48,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:48,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:48,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:48,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:24:48,773 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 14 treesize of output 10 [2021-11-25 19:24:48,816 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:24:48,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 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 19:24:49,061 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:24:49,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:24:49,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:24:49,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:24:49,418 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:24:53,367 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37148#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:24:53,368 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:24:53,368 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:24:53,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 20] total 57 [2021-11-25 19:24:53,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052745523] [2021-11-25 19:24:53,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:24:53,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-25 19:24:53,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:24:53,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-25 19:24:53,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=4660, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 19:24:53,371 INFO L87 Difference]: Start difference. First operand 715 states and 822 transitions. Second operand has 58 states, 57 states have (on average 2.3333333333333335) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:02,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:25:02,197 INFO L93 Difference]: Finished difference Result 1243 states and 1363 transitions. [2021-11-25 19:25:02,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-25 19:25:02,198 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 2.3333333333333335) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-25 19:25:02,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:25:02,203 INFO L225 Difference]: With dead ends: 1243 [2021-11-25 19:25:02,203 INFO L226 Difference]: Without dead ends: 1187 [2021-11-25 19:25:02,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7334 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=5097, Invalid=23295, Unknown=0, NotChecked=0, Total=28392 [2021-11-25 19:25:02,205 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 1152 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 2151 mSolverCounterSat, 377 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1152 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 2528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 377 IncrementalHoareTripleChecker+Valid, 2151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:25:02,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1152 Valid, 375 Invalid, 2528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [377 Valid, 2151 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-25 19:25:02,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1187 states. [2021-11-25 19:25:02,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1187 to 719. [2021-11-25 19:25:02,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 719 states, 716 states have (on average 1.155027932960894) internal successors, (827), 718 states have internal predecessors, (827), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:02,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 719 states to 719 states and 827 transitions. [2021-11-25 19:25:02,221 INFO L78 Accepts]: Start accepts. Automaton has 719 states and 827 transitions. Word has length 45 [2021-11-25 19:25:02,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:25:02,221 INFO L470 AbstractCegarLoop]: Abstraction has 719 states and 827 transitions. [2021-11-25 19:25:02,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 2.3333333333333335) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:02,221 INFO L276 IsEmpty]: Start isEmpty. Operand 719 states and 827 transitions. [2021-11-25 19:25:02,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 19:25:02,223 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:25:02,223 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:25:02,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-25 19:25:02,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:25:02,429 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:25:02,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:25:02,429 INFO L85 PathProgramCache]: Analyzing trace with hash -1930462656, now seen corresponding path program 13 times [2021-11-25 19:25:02,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:25:02,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911558598] [2021-11-25 19:25:02,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:25:02,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:25:02,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:25:03,106 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 49 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:25:03,106 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:25:03,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911558598] [2021-11-25 19:25:03,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1911558598] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:25:03,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434242203] [2021-11-25 19:25:03,106 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:25:03,106 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:25:03,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:25:03,109 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:25:03,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 19:25:03,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:25:03,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-25 19:25:03,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:25:03,332 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:25:03,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:25:04,546 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 64 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:25:04,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:25:06,112 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 81 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:25:06,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434242203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:25:06,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1028077737] [2021-11-25 19:25:06,114 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:25:06,114 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:25:06,114 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:25:06,114 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:25:06,114 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:25:06,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:06,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:06,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:25:06,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:06,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:06,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:06,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:06,414 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:25:06,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:25:06,534 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:25:08,147 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39654#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:25:08,147 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:25:08,147 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:25:08,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 71 [2021-11-25 19:25:08,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608127103] [2021-11-25 19:25:08,148 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:25:08,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-25 19:25:08,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:25:08,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-25 19:25:08,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=604, Invalid=5716, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 19:25:08,150 INFO L87 Difference]: Start difference. First operand 719 states and 827 transitions. Second operand has 72 states, 71 states have (on average 1.8732394366197183) internal successors, (133), 72 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:12,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:25:12,737 INFO L93 Difference]: Finished difference Result 2071 states and 2242 transitions. [2021-11-25 19:25:12,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-25 19:25:12,737 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 71 states have (on average 1.8732394366197183) internal successors, (133), 72 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-25 19:25:12,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:25:12,744 INFO L225 Difference]: With dead ends: 2071 [2021-11-25 19:25:12,745 INFO L226 Difference]: Without dead ends: 2071 [2021-11-25 19:25:12,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3089 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=2293, Invalid=11749, Unknown=0, NotChecked=0, Total=14042 [2021-11-25 19:25:12,746 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 630 mSDsluCounter, 801 mSDsCounter, 0 mSdLazyCounter, 3765 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 630 SdHoareTripleChecker+Valid, 825 SdHoareTripleChecker+Invalid, 3933 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 3765 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:25:12,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [630 Valid, 825 Invalid, 3933 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 3765 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 19:25:12,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2071 states. [2021-11-25 19:25:12,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2071 to 729. [2021-11-25 19:25:12,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 729 states, 726 states have (on average 1.1584022038567494) internal successors, (841), 728 states have internal predecessors, (841), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:12,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 729 states to 729 states and 841 transitions. [2021-11-25 19:25:12,760 INFO L78 Accepts]: Start accepts. Automaton has 729 states and 841 transitions. Word has length 45 [2021-11-25 19:25:12,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:25:12,760 INFO L470 AbstractCegarLoop]: Abstraction has 729 states and 841 transitions. [2021-11-25 19:25:12,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 71 states have (on average 1.8732394366197183) internal successors, (133), 72 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:12,760 INFO L276 IsEmpty]: Start isEmpty. Operand 729 states and 841 transitions. [2021-11-25 19:25:12,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 19:25:12,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:25:12,762 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:25:12,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-25 19:25:12,988 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-25 19:25:12,989 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:25:12,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:25:12,989 INFO L85 PathProgramCache]: Analyzing trace with hash 182400647, now seen corresponding path program 5 times [2021-11-25 19:25:12,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:25:12,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280687585] [2021-11-25 19:25:12,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:25:12,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:25:13,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:25:13,231 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 58 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:25:13,231 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:25:13,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280687585] [2021-11-25 19:25:13,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280687585] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:25:13,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075039167] [2021-11-25 19:25:13,232 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:25:13,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:25:13,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:25:13,237 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:25:13,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-25 19:25:13,663 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 19:25:13,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:25:13,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-25 19:25:13,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:25:13,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:25:13,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:25:14,305 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 67 proven. 21 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:25:14,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:25:14,606 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 67 proven. 21 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:25:14,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075039167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:25:14,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [797942681] [2021-11-25 19:25:14,608 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:25:14,608 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:25:14,608 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:25:14,608 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:25:14,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:25:14,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:14,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:14,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:25:14,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:14,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:14,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:14,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:14,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:14,862 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 14 treesize of output 10 [2021-11-25 19:25:14,899 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:25:14,900 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 19:25:15,095 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:25:15,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:25:15,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:15,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:15,508 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:25:18,732 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42846#(and (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (or (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= 1 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (exists ((|v_ULTIMATE.start_cstrcat_#t~post4#1.offset_265| Int) (|v_ULTIMATE.start_cstrcat_#t~post4#1.base_266| Int)) (and (= (select |#valid| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_266|) 1) (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_266|) |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_265|) 0)) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_265|) (<= (+ |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_265| 1) (select |#length| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_266|)) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.base_266|))) (<= 1 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcat_#t~post4#1.base|) |ULTIMATE.start_cstrcat_#t~post4#1.offset|) 0) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_cstrcat_#t~post5#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|)) (= |#NULL.base| 0))))' at error location [2021-11-25 19:25:18,732 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:25:18,732 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:25:18,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 36 [2021-11-25 19:25:18,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007649669] [2021-11-25 19:25:18,732 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:25:18,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 19:25:18,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:25:18,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 19:25:18,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=2186, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 19:25:18,733 INFO L87 Difference]: Start difference. First operand 729 states and 841 transitions. Second operand has 36 states, 36 states have (on average 2.9166666666666665) internal successors, (105), 36 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:20,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:25:20,242 INFO L93 Difference]: Finished difference Result 1001 states and 1138 transitions. [2021-11-25 19:25:20,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-25 19:25:20,242 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.9166666666666665) internal successors, (105), 36 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-25 19:25:20,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:25:20,245 INFO L225 Difference]: With dead ends: 1001 [2021-11-25 19:25:20,245 INFO L226 Difference]: Without dead ends: 879 [2021-11-25 19:25:20,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1901 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=1125, Invalid=5847, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 19:25:20,246 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 300 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 910 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 961 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 910 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:25:20,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 177 Invalid, 961 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 910 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:25:20,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 879 states. [2021-11-25 19:25:20,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 879 to 805. [2021-11-25 19:25:20,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 805 states, 802 states have (on average 1.155860349127182) internal successors, (927), 804 states have internal predecessors, (927), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:20,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 805 states to 805 states and 927 transitions. [2021-11-25 19:25:20,256 INFO L78 Accepts]: Start accepts. Automaton has 805 states and 927 transitions. Word has length 46 [2021-11-25 19:25:20,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:25:20,256 INFO L470 AbstractCegarLoop]: Abstraction has 805 states and 927 transitions. [2021-11-25 19:25:20,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.9166666666666665) internal successors, (105), 36 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:20,256 INFO L276 IsEmpty]: Start isEmpty. Operand 805 states and 927 transitions. [2021-11-25 19:25:20,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 19:25:20,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:25:20,257 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:25:20,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-25 19:25:20,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-25 19:25:20,485 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:25:20,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:25:20,485 INFO L85 PathProgramCache]: Analyzing trace with hash 251261110, now seen corresponding path program 14 times [2021-11-25 19:25:20,485 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:25:20,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924810630] [2021-11-25 19:25:20,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:25:20,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:25:20,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:25:20,840 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 30 proven. 171 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:25:20,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:25:20,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924810630] [2021-11-25 19:25:20,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924810630] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:25:20,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748529374] [2021-11-25 19:25:20,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:25:20,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:25:20,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:25:20,843 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:25:20,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-25 19:25:21,094 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-25 19:25:21,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:25:21,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-25 19:25:21,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:25:21,363 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 14 treesize of output 10 [2021-11-25 19:25:21,462 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 15 treesize of output 7 [2021-11-25 19:25:21,468 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 30 proven. 171 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:25:21,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:25:21,537 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 15 treesize of output 13 [2021-11-25 19:25:21,538 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 26 treesize of output 22 [2021-11-25 19:25:21,740 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 30 proven. 171 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:25:21,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748529374] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:25:21,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665783671] [2021-11-25 19:25:21,741 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:25:21,742 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:25:21,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:25:21,742 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:25:21,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:25:21,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:21,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:21,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:25:21,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:21,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:21,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:21,967 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 14 treesize of output 10 [2021-11-25 19:25:22,029 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:25:22,029 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 19:25:22,156 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:25:23,295 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45052#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:25:23,295 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:25:23,295 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:25:23,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 42 [2021-11-25 19:25:23,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514926549] [2021-11-25 19:25:23,295 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:25:23,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-25 19:25:23,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:25:23,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-25 19:25:23,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2297, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 19:25:23,296 INFO L87 Difference]: Start difference. First operand 805 states and 927 transitions. Second operand has 42 states, 42 states have (on average 1.8571428571428572) internal successors, (78), 42 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:25,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:25:25,252 INFO L93 Difference]: Finished difference Result 2538 states and 2747 transitions. [2021-11-25 19:25:25,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 19:25:25,253 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.8571428571428572) internal successors, (78), 42 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-25 19:25:25,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:25:25,261 INFO L225 Difference]: With dead ends: 2538 [2021-11-25 19:25:25,261 INFO L226 Difference]: Without dead ends: 2516 [2021-11-25 19:25:25,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 114 SyntacticMatches, 3 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1055 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=374, Invalid=4738, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 19:25:25,262 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 424 mSDsluCounter, 2308 mSDsCounter, 0 mSdLazyCounter, 3073 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 424 SdHoareTripleChecker+Valid, 2234 SdHoareTripleChecker+Invalid, 3315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 3073 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:25:25,262 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [424 Valid, 2234 Invalid, 3315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 3073 Invalid, 0 Unknown, 142 Unchecked, 1.2s Time] [2021-11-25 19:25:25,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2516 states. [2021-11-25 19:25:25,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2516 to 917. [2021-11-25 19:25:25,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 917 states, 914 states have (on average 1.163019693654267) internal successors, (1063), 916 states have internal predecessors, (1063), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:25,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 917 states to 917 states and 1063 transitions. [2021-11-25 19:25:25,278 INFO L78 Accepts]: Start accepts. Automaton has 917 states and 1063 transitions. Word has length 47 [2021-11-25 19:25:25,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:25:25,278 INFO L470 AbstractCegarLoop]: Abstraction has 917 states and 1063 transitions. [2021-11-25 19:25:25,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.8571428571428572) internal successors, (78), 42 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:25,278 INFO L276 IsEmpty]: Start isEmpty. Operand 917 states and 1063 transitions. [2021-11-25 19:25:25,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 19:25:25,279 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:25:25,279 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:25:25,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-25 19:25:25,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:25:25,480 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:25:25,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:25:25,480 INFO L85 PathProgramCache]: Analyzing trace with hash 288028405, now seen corresponding path program 6 times [2021-11-25 19:25:25,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:25:25,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001516381] [2021-11-25 19:25:25,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:25:25,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:25:25,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:25:26,302 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 12 proven. 85 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:25:26,302 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:25:26,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001516381] [2021-11-25 19:25:26,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001516381] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:25:26,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122410776] [2021-11-25 19:25:26,303 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:25:26,303 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:25:26,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:25:26,305 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:25:26,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-25 19:25:26,517 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:25:26,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:25:26,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-25 19:25:26,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:25:26,544 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:25:26,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:25:26,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:27,081 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:25:27,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2021-11-25 19:25:27,088 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 7 treesize of output 3 [2021-11-25 19:25:27,593 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:25:27,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 26 [2021-11-25 19:25:27,935 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:25:27,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 26 [2021-11-25 19:25:28,258 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:25:28,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 26 [2021-11-25 19:25:28,566 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:25:28,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 26 [2021-11-25 19:25:28,897 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:25:28,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 26 [2021-11-25 19:25:29,207 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:25:29,207 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 23 treesize of output 23 [2021-11-25 19:25:29,526 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 2 proven. 97 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:25:29,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:25:31,816 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:25:31,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:25:31,824 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:25:31,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:25:31,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:33,021 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 1 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:25:33,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122410776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:25:33,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [476706285] [2021-11-25 19:25:33,022 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:25:33,022 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:25:33,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:25:33,022 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:25:33,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:25:33,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:33,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:33,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:25:33,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:33,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:33,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:33,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:33,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:33,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:33,293 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:25:33,294 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 19:25:33,491 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:25:33,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:25:33,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:33,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:33,926 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:25:38,755 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48924#(and (or (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= 1 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.offset|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.offset|) (<= 0 |#NULL.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|)) (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.offset|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.offset|) (<= 0 |#NULL.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_cstrcat_#t~post5#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (or (and (<= 1 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (exists ((|v_ULTIMATE.start_cstrcat_#t~post4#1.offset_283| Int) (|v_ULTIMATE.start_cstrcat_#t~post4#1.base_284| Int)) (and (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.base_284|) (= (select |#valid| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_284|) 1) (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_284|) |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_283|) 0)) (<= (+ |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_283| 1) (select |#length| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_284|)) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_283|)))) (and (= (select (select |#memory_int| |ULTIMATE.start_cstrcat_#t~post4#1.base|) |ULTIMATE.start_cstrcat_#t~post4#1.offset|) 0) (= (select |#valid| |ULTIMATE.start_cstrcat_#t~post4#1.base|) 1) (<= |ULTIMATE.start_cstrcat_#t~post5#1.offset| 0) (<= (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|)))) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|))' at error location [2021-11-25 19:25:38,755 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:25:38,755 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:25:38,756 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 83 [2021-11-25 19:25:38,756 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128303631] [2021-11-25 19:25:38,756 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:25:38,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-25 19:25:38,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:25:38,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-25 19:25:38,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=8834, Unknown=4, NotChecked=0, Total=9312 [2021-11-25 19:25:38,758 INFO L87 Difference]: Start difference. First operand 917 states and 1063 transitions. Second operand has 83 states, 83 states have (on average 1.6987951807228916) internal successors, (141), 83 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:47,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:25:47,695 INFO L93 Difference]: Finished difference Result 1334 states and 1554 transitions. [2021-11-25 19:25:47,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-11-25 19:25:47,696 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.6987951807228916) internal successors, (141), 83 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-25 19:25:47,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:25:47,701 INFO L225 Difference]: With dead ends: 1334 [2021-11-25 19:25:47,701 INFO L226 Difference]: Without dead ends: 1220 [2021-11-25 19:25:47,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6425 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=1590, Invalid=27734, Unknown=88, NotChecked=0, Total=29412 [2021-11-25 19:25:47,704 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 241 mSDsluCounter, 648 mSDsCounter, 0 mSdLazyCounter, 1066 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 2063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 1066 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 968 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:25:47,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 498 Invalid, 2063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 1066 Invalid, 0 Unknown, 968 Unchecked, 0.5s Time] [2021-11-25 19:25:47,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1220 states. [2021-11-25 19:25:47,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1220 to 1103. [2021-11-25 19:25:47,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1103 states, 1100 states have (on average 1.1663636363636363) internal successors, (1283), 1102 states have internal predecessors, (1283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:47,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1103 states to 1103 states and 1283 transitions. [2021-11-25 19:25:47,716 INFO L78 Accepts]: Start accepts. Automaton has 1103 states and 1283 transitions. Word has length 48 [2021-11-25 19:25:47,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:25:47,717 INFO L470 AbstractCegarLoop]: Abstraction has 1103 states and 1283 transitions. [2021-11-25 19:25:47,717 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.6987951807228916) internal successors, (141), 83 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:25:47,717 INFO L276 IsEmpty]: Start isEmpty. Operand 1103 states and 1283 transitions. [2021-11-25 19:25:47,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 19:25:47,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:25:47,718 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:25:47,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2021-11-25 19:25:47,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-25 19:25:47,918 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:25:47,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:25:47,919 INFO L85 PathProgramCache]: Analyzing trace with hash 1957611275, now seen corresponding path program 6 times [2021-11-25 19:25:47,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:25:47,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697062955] [2021-11-25 19:25:47,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:25:47,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:25:47,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:25:48,387 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:25:48,387 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:25:48,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697062955] [2021-11-25 19:25:48,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [697062955] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:25:48,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805189549] [2021-11-25 19:25:48,388 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:25:48,388 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:25:48,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:25:48,389 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:25:48,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-25 19:25:48,594 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:25:48,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:25:48,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-25 19:25:48,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:25:48,622 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:25:48,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:25:48,862 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 14 treesize of output 10 [2021-11-25 19:25:50,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:50,521 INFO L354 Elim1Store]: treesize reduction 42, result has 59.2 percent of original size [2021-11-25 19:25:50,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 28 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 8 case distinctions, treesize of input 88 treesize of output 95 [2021-11-25 19:25:50,908 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-25 19:25:50,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:25:52,570 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 119 treesize of output 103 [2021-11-25 19:25:52,582 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,582 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,582 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,583 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,583 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,584 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,584 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,584 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,585 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,585 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,585 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,586 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,586 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,586 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,587 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,587 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,588 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,588 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,588 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,589 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,589 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,589 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,590 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,590 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,590 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,591 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,591 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,592 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:25:52,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 28 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 195 treesize of output 165 [2021-11-25 19:25:53,255 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-25 19:25:53,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805189549] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:25:53,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1521507395] [2021-11-25 19:25:53,257 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:25:53,257 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:25:53,257 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:25:53,257 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:25:53,257 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:25:53,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:53,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:25:53,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:25:53,350 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 11 treesize of output 7 [2021-11-25 19:25:53,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:53,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:53,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:53,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:53,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:53,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:25:53,580 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:25:53,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:25:53,764 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:25:53,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:25:53,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:53,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:25:54,129 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:25:57,877 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51884#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:25:57,877 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:25:57,877 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:25:57,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 22] total 66 [2021-11-25 19:25:57,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276792063] [2021-11-25 19:25:57,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:25:57,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-25 19:25:57,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:25:57,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-25 19:25:57,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=546, Invalid=5934, Unknown=0, NotChecked=0, Total=6480 [2021-11-25 19:25:57,879 INFO L87 Difference]: Start difference. First operand 1103 states and 1283 transitions. Second operand has 67 states, 66 states have (on average 1.7727272727272727) internal successors, (117), 67 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:05,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:26:05,214 INFO L93 Difference]: Finished difference Result 1409 states and 1623 transitions. [2021-11-25 19:26:05,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-25 19:26:05,215 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.7727272727272727) internal successors, (117), 67 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-25 19:26:05,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:26:05,219 INFO L225 Difference]: With dead ends: 1409 [2021-11-25 19:26:05,219 INFO L226 Difference]: Without dead ends: 1312 [2021-11-25 19:26:05,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4988 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=1712, Invalid=19458, Unknown=0, NotChecked=0, Total=21170 [2021-11-25 19:26:05,220 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 89 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 2626 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 3028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 2626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 313 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:26:05,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 150 Invalid, 3028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 2626 Invalid, 0 Unknown, 313 Unchecked, 1.3s Time] [2021-11-25 19:26:05,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1312 states. [2021-11-25 19:26:05,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1312 to 1081. [2021-11-25 19:26:05,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1081 states, 1078 states have (on average 1.1753246753246753) internal successors, (1267), 1080 states have internal predecessors, (1267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:05,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1081 states to 1081 states and 1267 transitions. [2021-11-25 19:26:05,232 INFO L78 Accepts]: Start accepts. Automaton has 1081 states and 1267 transitions. Word has length 49 [2021-11-25 19:26:05,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:26:05,232 INFO L470 AbstractCegarLoop]: Abstraction has 1081 states and 1267 transitions. [2021-11-25 19:26:05,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 1.7727272727272727) internal successors, (117), 67 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:05,233 INFO L276 IsEmpty]: Start isEmpty. Operand 1081 states and 1267 transitions. [2021-11-25 19:26:05,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 19:26:05,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:26:05,234 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:26:05,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-25 19:26:05,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-25 19:26:05,450 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:26:05,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:26:05,451 INFO L85 PathProgramCache]: Analyzing trace with hash 2079777570, now seen corresponding path program 10 times [2021-11-25 19:26:05,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:26:05,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695372824] [2021-11-25 19:26:05,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:26:05,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:26:05,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:26:06,388 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 14 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:06,388 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:26:06,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695372824] [2021-11-25 19:26:06,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695372824] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:26:06,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717814228] [2021-11-25 19:26:06,388 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:26:06,388 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:26:06,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:26:06,389 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:26:06,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-25 19:26:06,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:26:06,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 125 conjunts are in the unsatisfiable core [2021-11-25 19:26:06,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:26:06,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:26:06,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:07,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:26:07,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:26:07,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:26:07,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:26:07,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:26:07,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:26:07,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:26:07,473 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 15 treesize of output 7 [2021-11-25 19:26:07,479 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 14 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:07,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:26:07,495 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) |c_ULTIMATE.start_cstrcat_~append#1.offset|) 0)) is different from false [2021-11-25 19:26:07,502 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:26:07,508 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int)) (v_ArrVal_2102 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2102) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:26:07,515 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 2 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:26:07,522 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int)) (v_ArrVal_2101 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2101) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 2 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:26:07,530 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int))) (= 0 (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 3 |c_ULTIMATE.start_cstrcat_~append#1.offset|)))) is different from false [2021-11-25 19:26:07,537 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int)) (v_ArrVal_2100 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2100) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 3 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:26:07,544 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 4)) 0)) is different from false [2021-11-25 19:26:07,551 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int)) (v_ArrVal_2099 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2099) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 4)) 0)) is different from false [2021-11-25 19:26:07,558 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 5 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:26:07,565 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int)) (v_ArrVal_2098 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2098) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 5 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:26:07,572 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2103) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 6 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:26:07,582 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2103 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2103) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 6)) 0)) is different from false [2021-11-25 19:26:07,592 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:26:07,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:26:07,597 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:26:07,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:26:07,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:07,822 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 14 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 83 not checked. [2021-11-25 19:26:07,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717814228] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:26:07,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [78773414] [2021-11-25 19:26:07,823 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:26:07,823 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:26:07,823 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:26:07,823 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:26:07,823 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:26:07,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:26:07,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:26:07,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:26:07,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:07,967 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 14 treesize of output 10 [2021-11-25 19:26:07,989 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 14 treesize of output 10 [2021-11-25 19:26:08,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:08,083 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:26:08,084 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 19:26:08,184 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:26:08,185 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:26:08,212 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:26:08,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:26:08,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:08,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:08,463 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:26:10,922 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54876#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:26:10,922 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:26:10,923 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:26:10,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 27, 27] total 64 [2021-11-25 19:26:10,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207770523] [2021-11-25 19:26:10,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:26:10,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-25 19:26:10,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:26:10,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-25 19:26:10,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=3836, Unknown=13, NotChecked=1768, Total=5852 [2021-11-25 19:26:10,924 INFO L87 Difference]: Start difference. First operand 1081 states and 1267 transitions. Second operand has 64 states, 64 states have (on average 1.8125) internal successors, (116), 64 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:12,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:26:12,421 INFO L93 Difference]: Finished difference Result 1177 states and 1384 transitions. [2021-11-25 19:26:12,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 19:26:12,422 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.8125) internal successors, (116), 64 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-25 19:26:12,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:26:12,425 INFO L225 Difference]: With dead ends: 1177 [2021-11-25 19:26:12,426 INFO L226 Difference]: Without dead ends: 1145 [2021-11-25 19:26:12,426 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 103 SyntacticMatches, 16 SemanticMatches, 88 ConstructedPredicates, 13 IntricatePredicates, 0 DeprecatedPredicates, 1537 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=319, Invalid=5572, Unknown=13, NotChecked=2106, Total=8010 [2021-11-25 19:26:12,426 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 54 mSDsluCounter, 756 mSDsCounter, 0 mSdLazyCounter, 1437 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 533 SdHoareTripleChecker+Invalid, 2371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 918 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:26:12,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 533 Invalid, 2371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1437 Invalid, 0 Unknown, 918 Unchecked, 0.6s Time] [2021-11-25 19:26:12,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1145 states. [2021-11-25 19:26:12,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1145 to 1144. [2021-11-25 19:26:12,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1144 states, 1141 states have (on average 1.175284837861525) internal successors, (1341), 1143 states have internal predecessors, (1341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:12,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1144 states to 1144 states and 1341 transitions. [2021-11-25 19:26:12,437 INFO L78 Accepts]: Start accepts. Automaton has 1144 states and 1341 transitions. Word has length 50 [2021-11-25 19:26:12,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:26:12,438 INFO L470 AbstractCegarLoop]: Abstraction has 1144 states and 1341 transitions. [2021-11-25 19:26:12,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.8125) internal successors, (116), 64 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:12,438 INFO L276 IsEmpty]: Start isEmpty. Operand 1144 states and 1341 transitions. [2021-11-25 19:26:12,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 19:26:12,439 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:26:12,439 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:26:12,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-25 19:26:12,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:26:12,639 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:26:12,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:26:12,640 INFO L85 PathProgramCache]: Analyzing trace with hash 1069912638, now seen corresponding path program 7 times [2021-11-25 19:26:12,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:26:12,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572154587] [2021-11-25 19:26:12,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:26:12,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:26:12,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:26:13,090 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 25 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:13,090 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:26:13,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572154587] [2021-11-25 19:26:13,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [572154587] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:26:13,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024553980] [2021-11-25 19:26:13,090 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:26:13,091 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:26:13,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:26:13,092 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:26:13,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-25 19:26:13,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:26:13,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-25 19:26:13,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:26:13,297 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:26:13,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:26:14,107 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 37 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:14,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:26:15,196 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 53 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:15,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024553980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:26:15,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [245629529] [2021-11-25 19:26:15,197 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:26:15,197 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:26:15,198 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:26:15,198 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:26:15,198 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:26:15,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:26:15,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:26:15,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:26:15,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:15,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:15,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:15,382 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 14 treesize of output 10 [2021-11-25 19:26:15,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:15,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:15,467 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:26:15,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:26:15,640 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:26:15,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:26:15,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:15,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:16,034 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:26:19,365 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57618#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:26:19,366 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:26:19,366 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:26:19,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 68 [2021-11-25 19:26:19,366 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837010718] [2021-11-25 19:26:19,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:26:19,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-25 19:26:19,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:26:19,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-25 19:26:19,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=554, Invalid=6252, Unknown=0, NotChecked=0, Total=6806 [2021-11-25 19:26:19,367 INFO L87 Difference]: Start difference. First operand 1144 states and 1341 transitions. Second operand has 69 states, 68 states have (on average 2.2205882352941178) internal successors, (151), 69 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:30,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:26:30,484 INFO L93 Difference]: Finished difference Result 2449 states and 2684 transitions. [2021-11-25 19:26:30,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-11-25 19:26:30,484 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 68 states have (on average 2.2205882352941178) internal successors, (151), 69 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-25 19:26:30,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:26:30,495 INFO L225 Difference]: With dead ends: 2449 [2021-11-25 19:26:30,496 INFO L226 Difference]: Without dead ends: 2328 [2021-11-25 19:26:30,499 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12474 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=8231, Invalid=36501, Unknown=0, NotChecked=0, Total=44732 [2021-11-25 19:26:30,500 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 1405 mSDsluCounter, 651 mSDsCounter, 0 mSdLazyCounter, 3606 mSolverCounterSat, 444 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1405 SdHoareTripleChecker+Valid, 672 SdHoareTripleChecker+Invalid, 4050 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 444 IncrementalHoareTripleChecker+Valid, 3606 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:26:30,500 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1405 Valid, 672 Invalid, 4050 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [444 Valid, 3606 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 19:26:30,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2328 states. [2021-11-25 19:26:30,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2328 to 1126. [2021-11-25 19:26:30,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 1123 states have (on average 1.1549421193232414) internal successors, (1297), 1125 states have internal predecessors, (1297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:30,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 1297 transitions. [2021-11-25 19:26:30,523 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 1297 transitions. Word has length 51 [2021-11-25 19:26:30,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:26:30,523 INFO L470 AbstractCegarLoop]: Abstraction has 1126 states and 1297 transitions. [2021-11-25 19:26:30,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 68 states have (on average 2.2205882352941178) internal successors, (151), 69 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:30,524 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 1297 transitions. [2021-11-25 19:26:30,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 19:26:30,526 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:26:30,526 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:26:30,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-25 19:26:30,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2021-11-25 19:26:30,743 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:26:30,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:26:30,743 INFO L85 PathProgramCache]: Analyzing trace with hash -59720560, now seen corresponding path program 11 times [2021-11-25 19:26:30,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:26:30,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306483917] [2021-11-25 19:26:30,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:26:30,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:26:30,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:26:31,158 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 25 proven. 122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:31,159 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:26:31,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306483917] [2021-11-25 19:26:31,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1306483917] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:26:31,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1777407442] [2021-11-25 19:26:31,159 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:26:31,159 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:26:31,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:26:31,160 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:26:31,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-25 19:26:31,630 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 19:26:31,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:26:31,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-25 19:26:31,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:26:31,649 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:26:31,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:26:32,112 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 36 proven. 111 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:32,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:26:32,868 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 36 proven. 111 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:32,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1777407442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:26:32,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1150376294] [2021-11-25 19:26:32,869 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:26:32,869 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:26:32,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:26:32,869 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:26:32,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:26:32,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:26:32,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:26:32,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:26:32,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:32,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:33,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:33,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:33,151 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:26:33,152 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 19:26:33,268 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:26:33,270 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:26:33,296 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:26:33,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:26:33,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:33,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:33,554 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:26:36,198 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '61830#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:26:36,199 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:26:36,199 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:26:36,199 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 58 [2021-11-25 19:26:36,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252592589] [2021-11-25 19:26:36,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:26:36,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-25 19:26:36,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:26:36,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-25 19:26:36,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=4592, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 19:26:36,201 INFO L87 Difference]: Start difference. First operand 1126 states and 1297 transitions. Second operand has 59 states, 58 states have (on average 2.6551724137931036) internal successors, (154), 59 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:37,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:26:37,748 INFO L93 Difference]: Finished difference Result 1602 states and 1813 transitions. [2021-11-25 19:26:37,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 19:26:37,749 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 2.6551724137931036) internal successors, (154), 59 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-25 19:26:37,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:26:37,757 INFO L225 Difference]: With dead ends: 1602 [2021-11-25 19:26:37,757 INFO L226 Difference]: Without dead ends: 1602 [2021-11-25 19:26:37,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2557 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1443, Invalid=7869, Unknown=0, NotChecked=0, Total=9312 [2021-11-25 19:26:37,759 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 600 mSDsluCounter, 376 mSDsCounter, 0 mSdLazyCounter, 1240 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 600 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 1303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:26:37,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [600 Valid, 290 Invalid, 1303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1240 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:26:37,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1602 states. [2021-11-25 19:26:37,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1602 to 1242. [2021-11-25 19:26:37,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1242 states, 1239 states have (on average 1.175948345439871) internal successors, (1457), 1241 states have internal predecessors, (1457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:37,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1242 states to 1242 states and 1457 transitions. [2021-11-25 19:26:37,782 INFO L78 Accepts]: Start accepts. Automaton has 1242 states and 1457 transitions. Word has length 52 [2021-11-25 19:26:37,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:26:37,783 INFO L470 AbstractCegarLoop]: Abstraction has 1242 states and 1457 transitions. [2021-11-25 19:26:37,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 58 states have (on average 2.6551724137931036) internal successors, (154), 59 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:37,783 INFO L276 IsEmpty]: Start isEmpty. Operand 1242 states and 1457 transitions. [2021-11-25 19:26:37,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-25 19:26:37,785 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:26:37,785 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:26:37,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-25 19:26:38,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:26:38,003 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:26:38,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:26:38,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1653605440, now seen corresponding path program 8 times [2021-11-25 19:26:38,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:26:38,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698233929] [2021-11-25 19:26:38,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:26:38,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:26:38,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:26:38,519 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:38,519 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:26:38,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698233929] [2021-11-25 19:26:38,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698233929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:26:38,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591785394] [2021-11-25 19:26:38,520 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:26:38,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:26:38,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:26:38,525 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:26:38,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-25 19:26:39,063 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 19:26:39,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:26:39,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-25 19:26:39,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:26:39,106 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:26:39,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:26:40,002 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 20 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:40,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:26:41,258 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 34 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:26:41,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591785394] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:26:41,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1429334446] [2021-11-25 19:26:41,259 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:26:41,259 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:26:41,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:26:41,260 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:26:41,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:26:41,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:26:41,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:26:41,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:26:41,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:41,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:41,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:41,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:41,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:41,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:41,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:41,662 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:26:41,662 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 19:26:41,857 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:26:41,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:26:41,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:42,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:26:42,221 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:26:46,235 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '65113#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:26:46,236 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:26:46,236 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:26:46,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 22, 22] total 63 [2021-11-25 19:26:46,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935344594] [2021-11-25 19:26:46,236 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:26:46,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-25 19:26:46,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:26:46,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-25 19:26:46,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=5474, Unknown=0, NotChecked=0, Total=6006 [2021-11-25 19:26:46,238 INFO L87 Difference]: Start difference. First operand 1242 states and 1457 transitions. Second operand has 64 states, 63 states have (on average 2.492063492063492) internal successors, (157), 64 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:56,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:26:56,592 INFO L93 Difference]: Finished difference Result 2283 states and 2524 transitions. [2021-11-25 19:26:56,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-25 19:26:56,593 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 2.492063492063492) internal successors, (157), 64 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-25 19:26:56,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:26:56,598 INFO L225 Difference]: With dead ends: 2283 [2021-11-25 19:26:56,598 INFO L226 Difference]: Without dead ends: 2215 [2021-11-25 19:26:56,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9099 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=6624, Invalid=28532, Unknown=0, NotChecked=0, Total=35156 [2021-11-25 19:26:56,601 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 1841 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 1935 mSolverCounterSat, 566 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1841 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 2501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 566 IncrementalHoareTripleChecker+Valid, 1935 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:26:56,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1841 Valid, 365 Invalid, 2501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [566 Valid, 1935 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-25 19:26:56,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2215 states. [2021-11-25 19:26:56,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2215 to 1256. [2021-11-25 19:26:56,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1256 states, 1253 states have (on average 1.1771747805267359) internal successors, (1475), 1255 states have internal predecessors, (1475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:56,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1256 states to 1256 states and 1475 transitions. [2021-11-25 19:26:56,621 INFO L78 Accepts]: Start accepts. Automaton has 1256 states and 1475 transitions. Word has length 53 [2021-11-25 19:26:56,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:26:56,622 INFO L470 AbstractCegarLoop]: Abstraction has 1256 states and 1475 transitions. [2021-11-25 19:26:56,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 63 states have (on average 2.492063492063492) internal successors, (157), 64 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:26:56,622 INFO L276 IsEmpty]: Start isEmpty. Operand 1256 states and 1475 transitions. [2021-11-25 19:26:56,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 19:26:56,623 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:26:56,623 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:26:56,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-25 19:26:56,824 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-11-25 19:26:56,824 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:26:56,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:26:56,824 INFO L85 PathProgramCache]: Analyzing trace with hash 1303663595, now seen corresponding path program 7 times [2021-11-25 19:26:56,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:26:56,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638245884] [2021-11-25 19:26:56,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:26:56,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:26:56,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:26:57,683 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 14 proven. 120 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:26:57,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:26:57,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638245884] [2021-11-25 19:26:57,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638245884] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:26:57,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193036610] [2021-11-25 19:26:57,684 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:26:57,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:26:57,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:26:57,687 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:26:57,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-25 19:26:57,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:26:57,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 125 conjunts are in the unsatisfiable core [2021-11-25 19:26:57,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:26:57,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:26:58,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:26:58,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:26:58,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:26:59,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:26:59,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:26:59,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:26:59,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:27:00,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:27:00,305 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:27:00,307 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:27:00,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2021-11-25 19:27:00,315 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 14 proven. 120 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:27:00,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:27:00,331 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) |c_ULTIMATE.start_cstrcat_~append#1.offset|) 0)) is different from false [2021-11-25 19:27:00,338 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:27:00,345 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int)) (v_ArrVal_2398 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2398) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:27:00,353 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 2 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:27:00,361 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int)) (v_ArrVal_2397 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2397) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 2 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:27:00,369 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 3 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:27:00,377 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int)) (v_ArrVal_2396 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2396) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 3 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:27:00,385 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 4)) 0)) is different from false [2021-11-25 19:27:00,393 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int)) (v_ArrVal_2395 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2395) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 4)) 0)) is different from false [2021-11-25 19:27:00,401 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 5 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:27:00,409 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int)) (v_ArrVal_2394 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_2394) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 5 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:27:00,489 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int)) (|v_ULTIMATE.start_cstrcat_#t~post5#1.offset_367| Int)) (or (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_2399) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_367| 6)) 0) (< |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_367| 0) (< |c_ULTIMATE.start_cstrcat_~append#1.offset| |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_367|))) is different from false [2021-11-25 19:27:00,551 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2399 (Array Int Int)) (|v_ULTIMATE.start_cstrcat_#t~post5#1.offset_367| Int)) (or (< |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_367| 0) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2399) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_367| 6)) 0) (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_367|))) is different from false [2021-11-25 19:27:00,562 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:27:00,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:27:00,569 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:27:00,570 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:27:00,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:27:01,527 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 14 proven. 38 refuted. 0 times theorem prover too weak. 3 trivial. 82 not checked. [2021-11-25 19:27:01,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193036610] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:27:01,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1440054512] [2021-11-25 19:27:01,529 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:27:01,529 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:27:01,529 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:27:01,529 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:27:01,529 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:27:01,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:27:01,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:27:01,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:27:01,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:01,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:01,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:01,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:01,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:01,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:01,888 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:27:01,888 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 19:27:02,153 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:27:02,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:27:02,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:27:02,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:27:02,774 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:27:07,688 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69285#(and (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (or (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= 1 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (exists ((|v_ULTIMATE.start_cstrcat_#t~post4#1.offset_371| Int) (|v_ULTIMATE.start_cstrcat_#t~post4#1.base_372| Int)) (and (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_371|) (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_372|) |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_371|) 0)) (<= (+ |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_371| 1) (select |#length| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_372|)) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.base_372|) (= (select |#valid| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_372|) 1))) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcat_#t~post4#1.base|) |ULTIMATE.start_cstrcat_#t~post4#1.offset|) 0) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_cstrcat_#t~post5#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|)) (= |#NULL.base| 0))) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|))' at error location [2021-11-25 19:27:07,688 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:27:07,688 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:27:07,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 28, 28] total 81 [2021-11-25 19:27:07,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855861423] [2021-11-25 19:27:07,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:27:07,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-25 19:27:07,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:27:07,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-25 19:27:07,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=6377, Unknown=13, NotChecked=2236, Total=8930 [2021-11-25 19:27:07,690 INFO L87 Difference]: Start difference. First operand 1256 states and 1475 transitions. Second operand has 81 states, 81 states have (on average 1.8024691358024691) internal successors, (146), 81 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:27:10,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:27:10,927 INFO L93 Difference]: Finished difference Result 1595 states and 1808 transitions. [2021-11-25 19:27:10,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 19:27:10,928 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.8024691358024691) internal successors, (146), 81 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-25 19:27:10,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:27:10,929 INFO L225 Difference]: With dead ends: 1595 [2021-11-25 19:27:10,930 INFO L226 Difference]: Without dead ends: 1463 [2021-11-25 19:27:10,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 102 SyntacticMatches, 7 SemanticMatches, 115 ConstructedPredicates, 13 IntricatePredicates, 5 DeprecatedPredicates, 3018 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=477, Invalid=10274, Unknown=13, NotChecked=2808, Total=13572 [2021-11-25 19:27:10,931 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 205 mSDsluCounter, 1984 mSDsCounter, 0 mSdLazyCounter, 2214 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 1609 SdHoareTripleChecker+Invalid, 4996 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 2214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2767 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:27:10,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 1609 Invalid, 4996 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 2214 Invalid, 0 Unknown, 2767 Unchecked, 1.1s Time] [2021-11-25 19:27:10,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1463 states. [2021-11-25 19:27:10,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1463 to 1261. [2021-11-25 19:27:10,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1261 states, 1258 states have (on average 1.1558028616852147) internal successors, (1454), 1260 states have internal predecessors, (1454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:27:10,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1261 states to 1261 states and 1454 transitions. [2021-11-25 19:27:10,941 INFO L78 Accepts]: Start accepts. Automaton has 1261 states and 1454 transitions. Word has length 54 [2021-11-25 19:27:10,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:27:10,942 INFO L470 AbstractCegarLoop]: Abstraction has 1261 states and 1454 transitions. [2021-11-25 19:27:10,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 1.8024691358024691) internal successors, (146), 81 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:27:10,942 INFO L276 IsEmpty]: Start isEmpty. Operand 1261 states and 1454 transitions. [2021-11-25 19:27:10,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 19:27:10,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:27:10,944 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:27:10,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-25 19:27:11,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:27:11,157 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:27:11,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:27:11,157 INFO L85 PathProgramCache]: Analyzing trace with hash -625410716, now seen corresponding path program 9 times [2021-11-25 19:27:11,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:27:11,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508829681] [2021-11-25 19:27:11,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:27:11,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:27:11,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:27:11,722 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 13 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:27:11,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:27:11,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508829681] [2021-11-25 19:27:11,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508829681] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:27:11,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559381410] [2021-11-25 19:27:11,723 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:27:11,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:27:11,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:27:11,724 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:27:11,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-25 19:27:11,947 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:27:11,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:27:11,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-25 19:27:11,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:27:11,977 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:27:11,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:27:11,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:27:12,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:12,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:27:12,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:27:12,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:27:12,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:27:12,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:27:12,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:27:12,943 INFO L354 Elim1Store]: treesize reduction 18, result has 64.7 percent of original size [2021-11-25 19:27:12,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 48 treesize of output 51 [2021-11-25 19:27:13,787 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-25 19:27:13,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:27:15,239 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 59 treesize of output 51 [2021-11-25 19:27:15,247 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:27:15,247 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:27:15,248 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:27:15,257 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:27:15,258 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:27:15,258 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:27:15,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 81 [2021-11-25 19:27:16,014 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-25 19:27:16,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559381410] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:27:16,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [260206042] [2021-11-25 19:27:16,016 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:27:16,016 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:27:16,016 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:27:16,016 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:27:16,016 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:27:16,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:27:16,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:27:16,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:27:16,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:16,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:16,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:16,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:16,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:16,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:16,342 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:27:16,343 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 19:27:16,576 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:27:16,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:27:16,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:27:16,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:27:16,960 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:27:21,266 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '72591#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:27:21,267 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:27:21,267 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:27:21,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 19, 19] total 59 [2021-11-25 19:27:21,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148119335] [2021-11-25 19:27:21,267 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:27:21,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-25 19:27:21,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:27:21,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-25 19:27:21,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=5041, Unknown=0, NotChecked=0, Total=5402 [2021-11-25 19:27:21,268 INFO L87 Difference]: Start difference. First operand 1261 states and 1454 transitions. Second operand has 60 states, 59 states have (on average 2.288135593220339) internal successors, (135), 60 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:27:34,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:27:34,826 INFO L93 Difference]: Finished difference Result 1887 states and 2088 transitions. [2021-11-25 19:27:34,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2021-11-25 19:27:34,827 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 2.288135593220339) internal successors, (135), 60 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-25 19:27:34,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:27:34,829 INFO L225 Difference]: With dead ends: 1887 [2021-11-25 19:27:34,829 INFO L226 Difference]: Without dead ends: 1554 [2021-11-25 19:27:34,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12166 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=3267, Invalid=38553, Unknown=0, NotChecked=0, Total=41820 [2021-11-25 19:27:34,831 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 140 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 3721 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 696 SdHoareTripleChecker+Invalid, 4208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 3721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 356 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:27:34,831 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 696 Invalid, 4208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 3721 Invalid, 0 Unknown, 356 Unchecked, 2.4s Time] [2021-11-25 19:27:34,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1554 states. [2021-11-25 19:27:34,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1554 to 1161. [2021-11-25 19:27:34,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1161 states, 1158 states have (on average 1.1563039723661486) internal successors, (1339), 1160 states have internal predecessors, (1339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:27:34,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1161 states to 1161 states and 1339 transitions. [2021-11-25 19:27:34,844 INFO L78 Accepts]: Start accepts. Automaton has 1161 states and 1339 transitions. Word has length 55 [2021-11-25 19:27:34,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:27:34,845 INFO L470 AbstractCegarLoop]: Abstraction has 1161 states and 1339 transitions. [2021-11-25 19:27:34,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 2.288135593220339) internal successors, (135), 60 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:27:34,845 INFO L276 IsEmpty]: Start isEmpty. Operand 1161 states and 1339 transitions. [2021-11-25 19:27:34,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 19:27:34,847 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:27:34,847 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:27:34,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-25 19:27:35,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:27:35,061 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:27:35,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:27:35,061 INFO L85 PathProgramCache]: Analyzing trace with hash -1515282920, now seen corresponding path program 12 times [2021-11-25 19:27:35,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:27:35,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105955137] [2021-11-25 19:27:35,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:27:35,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:27:35,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:27:36,187 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 16 proven. 161 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:27:36,187 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:27:36,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105955137] [2021-11-25 19:27:36,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105955137] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:27:36,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2117403369] [2021-11-25 19:27:36,187 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:27:36,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:27:36,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:27:36,188 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:27:36,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-25 19:27:36,405 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:27:36,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:27:36,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-25 19:27:36,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:27:36,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-11-25 19:27:36,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:27:37,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:27:37,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:27:37,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:27:37,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:27:42,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:27:48,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:27:54,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:27:59,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:28:02,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:28:02,546 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:28:02,547 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 7 [2021-11-25 19:28:02,556 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 72 proven. 95 refuted. 10 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:28:02,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:28:12,800 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:28:12,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2021-11-25 19:28:12,808 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:28:12,808 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 33 treesize of output 33 [2021-11-25 19:28:12,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-25 19:28:14,206 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 52 proven. 84 refuted. 41 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:28:14,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2117403369] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:28:14,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [515615800] [2021-11-25 19:28:14,207 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:28:14,208 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:28:14,208 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:28:14,208 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:28:14,208 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:28:14,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:28:14,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:28:14,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:28:14,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:28:14,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:28:14,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:28:14,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:28:14,522 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:28:14,522 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 19:28:14,663 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:28:14,664 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:28:14,697 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:28:14,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:28:14,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:28:14,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:28:15,004 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:28:18,917 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '76338#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:28:18,917 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:28:18,917 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:28:18,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 29, 29] total 89 [2021-11-25 19:28:18,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529705343] [2021-11-25 19:28:18,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:28:18,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-25 19:28:18,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:28:18,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-25 19:28:18,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=583, Invalid=9594, Unknown=125, NotChecked=0, Total=10302 [2021-11-25 19:28:18,921 INFO L87 Difference]: Start difference. First operand 1161 states and 1339 transitions. Second operand has 89 states, 89 states have (on average 1.7752808988764044) internal successors, (158), 89 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:28:52,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:28:52,517 INFO L93 Difference]: Finished difference Result 1263 states and 1462 transitions. [2021-11-25 19:28:52,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-25 19:28:52,518 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.7752808988764044) internal successors, (158), 89 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-25 19:28:52,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:28:52,519 INFO L225 Difference]: With dead ends: 1263 [2021-11-25 19:28:52,519 INFO L226 Difference]: Without dead ends: 1227 [2021-11-25 19:28:52,521 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5504 ImplicationChecksByTransitivity, 72.7s TimeCoverageRelationStatistics Valid=1580, Invalid=21546, Unknown=130, NotChecked=0, Total=23256 [2021-11-25 19:28:52,521 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 216 mSDsluCounter, 960 mSDsCounter, 0 mSdLazyCounter, 1694 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 702 SdHoareTripleChecker+Invalid, 2140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1694 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 423 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:28:52,521 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 702 Invalid, 2140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1694 Invalid, 0 Unknown, 423 Unchecked, 1.0s Time] [2021-11-25 19:28:52,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1227 states. [2021-11-25 19:28:52,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1227 to 1224. [2021-11-25 19:28:52,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1224 states, 1221 states have (on average 1.1572481572481572) internal successors, (1413), 1223 states have internal predecessors, (1413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:28:52,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1224 states to 1224 states and 1413 transitions. [2021-11-25 19:28:52,533 INFO L78 Accepts]: Start accepts. Automaton has 1224 states and 1413 transitions. Word has length 56 [2021-11-25 19:28:52,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:28:52,533 INFO L470 AbstractCegarLoop]: Abstraction has 1224 states and 1413 transitions. [2021-11-25 19:28:52,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.7752808988764044) internal successors, (158), 89 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:28:52,534 INFO L276 IsEmpty]: Start isEmpty. Operand 1224 states and 1413 transitions. [2021-11-25 19:28:52,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 19:28:52,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:28:52,535 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:28:52,561 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2021-11-25 19:28:52,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-25 19:28:52,736 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:28:52,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:28:52,736 INFO L85 PathProgramCache]: Analyzing trace with hash 177155334, now seen corresponding path program 13 times [2021-11-25 19:28:52,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:28:52,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500561050] [2021-11-25 19:28:52,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:28:52,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:28:52,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:28:53,262 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 36 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:28:53,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:28:53,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500561050] [2021-11-25 19:28:53,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500561050] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:28:53,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268629023] [2021-11-25 19:28:53,263 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:28:53,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:28:53,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:28:53,264 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:28:53,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-25 19:28:53,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:28:53,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-25 19:28:53,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:28:53,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:28:53,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:28:53,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:28:54,649 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 49 proven. 143 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:28:54,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:28:55,975 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 64 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:28:55,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268629023] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:28:55,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1934689589] [2021-11-25 19:28:55,977 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:28:55,977 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:28:55,977 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:28:55,978 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:28:55,978 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:28:56,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:28:56,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:28:56,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:28:56,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:28:56,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:28:56,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:28:56,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:28:56,249 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:28:56,249 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 19:28:56,375 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:28:56,376 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:28:56,410 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:28:56,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:28:56,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:28:56,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:28:56,749 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:29:00,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '79345#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:29:00,309 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:29:00,309 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:29:00,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 62 [2021-11-25 19:29:00,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176312864] [2021-11-25 19:29:00,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:29:00,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-25 19:29:00,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:29:00,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-25 19:29:00,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=475, Invalid=5225, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 19:29:00,310 INFO L87 Difference]: Start difference. First operand 1224 states and 1413 transitions. Second operand has 63 states, 62 states have (on average 2.774193548387097) internal successors, (172), 63 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:29:03,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:29:03,941 INFO L93 Difference]: Finished difference Result 1724 states and 1963 transitions. [2021-11-25 19:29:03,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-25 19:29:03,942 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 62 states have (on average 2.774193548387097) internal successors, (172), 63 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-25 19:29:03,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:29:03,945 INFO L225 Difference]: With dead ends: 1724 [2021-11-25 19:29:03,945 INFO L226 Difference]: Without dead ends: 1724 [2021-11-25 19:29:03,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3093 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=2070, Invalid=11736, Unknown=0, NotChecked=0, Total=13806 [2021-11-25 19:29:03,947 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 717 mSDsluCounter, 601 mSDsCounter, 0 mSdLazyCounter, 2313 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 717 SdHoareTripleChecker+Valid, 460 SdHoareTripleChecker+Invalid, 2370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 2313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:29:03,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [717 Valid, 460 Invalid, 2370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 2313 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-25 19:29:03,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1724 states. [2021-11-25 19:29:03,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1724 to 1376. [2021-11-25 19:29:03,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1376 states, 1373 states have (on average 1.1784413692643845) internal successors, (1618), 1375 states have internal predecessors, (1618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:29:03,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1376 states to 1376 states and 1618 transitions. [2021-11-25 19:29:03,963 INFO L78 Accepts]: Start accepts. Automaton has 1376 states and 1618 transitions. Word has length 58 [2021-11-25 19:29:03,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:29:03,963 INFO L470 AbstractCegarLoop]: Abstraction has 1376 states and 1618 transitions. [2021-11-25 19:29:03,963 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 62 states have (on average 2.774193548387097) internal successors, (172), 63 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:29:03,963 INFO L276 IsEmpty]: Start isEmpty. Operand 1376 states and 1618 transitions. [2021-11-25 19:29:03,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 19:29:03,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:29:03,965 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:29:03,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-25 19:29:04,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-25 19:29:04,165 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:29:04,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:29:04,166 INFO L85 PathProgramCache]: Analyzing trace with hash -714404820, now seen corresponding path program 10 times [2021-11-25 19:29:04,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:29:04,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912593483] [2021-11-25 19:29:04,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:29:04,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:29:04,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:29:04,924 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 49 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:29:04,925 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:29:04,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912593483] [2021-11-25 19:29:04,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912593483] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:29:04,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779151994] [2021-11-25 19:29:04,925 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:29:04,925 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:29:04,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:29:04,927 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:29:04,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-25 19:29:05,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:29:05,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-25 19:29:05,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:29:05,241 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:29:05,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:29:06,346 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 65 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:29:06,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:29:08,091 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 85 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:29:08,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [779151994] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:29:08,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1151929419] [2021-11-25 19:29:08,092 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:29:08,092 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:29:08,093 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:29:08,093 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:29:08,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:29:08,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:29:08,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:29:08,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:29:08,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:29:08,233 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 14 treesize of output 10 [2021-11-25 19:29:08,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:08,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:08,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:08,392 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 14 treesize of output 10 [2021-11-25 19:29:08,436 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:29:08,436 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 19:29:08,676 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:29:08,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:29:08,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:29:08,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:29:09,119 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:29:13,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '82971#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:29:13,961 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:29:13,961 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:29:13,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 28] total 80 [2021-11-25 19:29:13,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563822230] [2021-11-25 19:29:13,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:29:13,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-25 19:29:13,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:29:13,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-25 19:29:13,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=727, Invalid=8203, Unknown=0, NotChecked=0, Total=8930 [2021-11-25 19:29:13,963 INFO L87 Difference]: Start difference. First operand 1376 states and 1618 transitions. Second operand has 81 states, 80 states have (on average 2.1875) internal successors, (175), 81 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:29:33,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:29:33,295 INFO L93 Difference]: Finished difference Result 3735 states and 3998 transitions. [2021-11-25 19:29:33,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 164 states. [2021-11-25 19:29:33,296 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 2.1875) internal successors, (175), 81 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-25 19:29:33,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:29:33,299 INFO L225 Difference]: With dead ends: 3735 [2021-11-25 19:29:33,300 INFO L226 Difference]: Without dead ends: 3603 [2021-11-25 19:29:33,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 108 SyntacticMatches, 1 SemanticMatches, 254 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18382 ImplicationChecksByTransitivity, 23.5s TimeCoverageRelationStatistics Valid=12511, Invalid=52769, Unknown=0, NotChecked=0, Total=65280 [2021-11-25 19:29:33,303 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 1674 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 4728 mSolverCounterSat, 547 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1674 SdHoareTripleChecker+Valid, 1037 SdHoareTripleChecker+Invalid, 5275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 547 IncrementalHoareTripleChecker+Valid, 4728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:29:33,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1674 Valid, 1037 Invalid, 5275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [547 Valid, 4728 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2021-11-25 19:29:33,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3603 states. [2021-11-25 19:29:33,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3603 to 1386. [2021-11-25 19:29:33,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1386 states, 1383 states have (on average 1.1663051337671728) internal successors, (1613), 1385 states have internal predecessors, (1613), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:29:33,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1386 states to 1386 states and 1613 transitions. [2021-11-25 19:29:33,330 INFO L78 Accepts]: Start accepts. Automaton has 1386 states and 1613 transitions. Word has length 59 [2021-11-25 19:29:33,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:29:33,330 INFO L470 AbstractCegarLoop]: Abstraction has 1386 states and 1613 transitions. [2021-11-25 19:29:33,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 80 states have (on average 2.1875) internal successors, (175), 81 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:29:33,330 INFO L276 IsEmpty]: Start isEmpty. Operand 1386 states and 1613 transitions. [2021-11-25 19:29:33,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 19:29:33,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:29:33,332 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:29:33,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-25 19:29:33,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:29:33,532 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:29:33,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:29:33,533 INFO L85 PathProgramCache]: Analyzing trace with hash -1589011615, now seen corresponding path program 8 times [2021-11-25 19:29:33,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:29:33,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29170459] [2021-11-25 19:29:33,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:29:33,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:29:33,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:29:34,729 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 16 proven. 161 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:29:34,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:29:34,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29170459] [2021-11-25 19:29:34,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29170459] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:29:34,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556058945] [2021-11-25 19:29:34,730 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:29:34,730 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:29:34,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:29:34,731 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:29:34,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-25 19:29:35,601 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-25 19:29:35,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:29:35,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 199 conjunts are in the unsatisfiable core [2021-11-25 19:29:35,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:29:35,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:29:36,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:36,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:29:36,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:29:36,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:29:37,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:29:37,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:29:37,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:29:37,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:29:37,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:29:38,124 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:29:38,124 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 19:29:38,248 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 16 proven. 163 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:29:38,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:29:38,437 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:29:38,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 23 [2021-11-25 19:29:40,522 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:29:40,522 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:29:40,530 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:29:40,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:29:40,534 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 11 treesize of output 7 [2021-11-25 19:29:41,741 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 2 proven. 177 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:29:41,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556058945] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:29:41,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [399075424] [2021-11-25 19:29:41,743 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:29:41,743 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:29:41,743 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:29:41,744 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:29:41,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:29:41,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:29:41,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:29:41,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:29:41,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:41,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:41,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:41,967 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 11 treesize of output 7 [2021-11-25 19:29:42,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:42,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:42,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:42,114 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:29:42,115 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 19:29:42,313 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:29:42,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:29:42,411 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 11 treesize of output 7 [2021-11-25 19:29:42,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:29:42,803 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:29:48,576 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88881#(and (or (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcat_#t~post4#1.base|) |ULTIMATE.start_cstrcat_#t~post4#1.offset|) 0) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_cstrcat_#t~post5#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|)) (= |#NULL.base| 0)) (and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= 1 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (exists ((|v_ULTIMATE.start_cstrcat_#t~post4#1.base_457| Int) (|v_ULTIMATE.start_cstrcat_#t~post4#1.offset_456| Int)) (and (<= (+ |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_456| 1) (select |#length| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_457|)) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.base_457|) (= (select |#valid| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_457|) 1) (not (= (select (select |#memory_int| |v_ULTIMATE.start_cstrcat_#t~post4#1.base_457|) |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_456|) 0)) (<= 0 |v_ULTIMATE.start_cstrcat_#t~post4#1.offset_456|))) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|))' at error location [2021-11-25 19:29:48,576 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:29:48,576 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:29:48,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 32, 33] total 99 [2021-11-25 19:29:48,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206792269] [2021-11-25 19:29:48,577 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:29:48,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2021-11-25 19:29:48,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:29:48,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-11-25 19:29:48,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=12175, Unknown=55, NotChecked=0, Total=12656 [2021-11-25 19:29:48,579 INFO L87 Difference]: Start difference. First operand 1386 states and 1613 transitions. Second operand has 99 states, 99 states have (on average 1.7676767676767677) internal successors, (175), 99 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:29:53,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:29:53,271 INFO L93 Difference]: Finished difference Result 1817 states and 2036 transitions. [2021-11-25 19:29:53,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-25 19:29:53,271 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.7676767676767677) internal successors, (175), 99 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-25 19:29:53,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:29:53,273 INFO L225 Difference]: With dead ends: 1817 [2021-11-25 19:29:53,273 INFO L226 Difference]: Without dead ends: 1507 [2021-11-25 19:29:53,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7188 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=798, Invalid=23327, Unknown=55, NotChecked=0, Total=24180 [2021-11-25 19:29:53,275 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 138 mSDsluCounter, 1501 mSDsCounter, 0 mSdLazyCounter, 2566 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 1101 SdHoareTripleChecker+Invalid, 4681 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 2566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2095 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:29:53,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 1101 Invalid, 4681 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 2566 Invalid, 0 Unknown, 2095 Unchecked, 1.4s Time] [2021-11-25 19:29:53,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1507 states. [2021-11-25 19:29:53,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1507 to 1383. [2021-11-25 19:29:53,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1383 states, 1380 states have (on average 1.141304347826087) internal successors, (1575), 1382 states have internal predecessors, (1575), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:29:53,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1383 states to 1383 states and 1575 transitions. [2021-11-25 19:29:53,293 INFO L78 Accepts]: Start accepts. Automaton has 1383 states and 1575 transitions. Word has length 60 [2021-11-25 19:29:53,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:29:53,294 INFO L470 AbstractCegarLoop]: Abstraction has 1383 states and 1575 transitions. [2021-11-25 19:29:53,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 1.7676767676767677) internal successors, (175), 99 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:29:53,294 INFO L276 IsEmpty]: Start isEmpty. Operand 1383 states and 1575 transitions. [2021-11-25 19:29:53,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 19:29:53,297 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:29:53,297 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:29:53,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-25 19:29:53,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-25 19:29:53,517 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:29:53,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:29:53,517 INFO L85 PathProgramCache]: Analyzing trace with hash -1755823619, now seen corresponding path program 11 times [2021-11-25 19:29:53,517 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:29:53,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506057692] [2021-11-25 19:29:53,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:29:53,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:29:53,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:29:54,066 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 25 proven. 139 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:29:54,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:29:54,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506057692] [2021-11-25 19:29:54,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506057692] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:29:54,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264232852] [2021-11-25 19:29:54,067 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:29:54,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:29:54,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:29:54,068 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:29:54,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-25 19:29:55,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 19:29:55,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:29:55,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-25 19:29:55,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:29:55,310 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:29:55,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:29:56,567 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 36 proven. 126 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:29:56,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:29:58,136 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 51 proven. 111 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:29:58,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264232852] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:29:58,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1803904654] [2021-11-25 19:29:58,137 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:29:58,137 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:29:58,137 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:29:58,137 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:29:58,138 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:29:58,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:29:58,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:29:58,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:29:58,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:58,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:58,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:58,359 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:58,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:58,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:29:58,469 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:29:58,470 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 19:29:58,717 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:29:58,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:29:58,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:29:58,936 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 11 treesize of output 7 [2021-11-25 19:29:59,139 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:30:03,296 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '92612#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:30:03,296 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:30:03,296 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:30:03,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 67 [2021-11-25 19:30:03,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650838898] [2021-11-25 19:30:03,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:30:03,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-25 19:30:03,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:03,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-25 19:30:03,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=590, Invalid=6052, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 19:30:03,298 INFO L87 Difference]: Start difference. First operand 1383 states and 1575 transitions. Second operand has 68 states, 67 states have (on average 2.671641791044776) internal successors, (179), 68 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:14,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:14,716 INFO L93 Difference]: Finished difference Result 2388 states and 2587 transitions. [2021-11-25 19:30:14,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-11-25 19:30:14,716 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 2.671641791044776) internal successors, (179), 68 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-25 19:30:14,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:14,720 INFO L225 Difference]: With dead ends: 2388 [2021-11-25 19:30:14,720 INFO L226 Difference]: Without dead ends: 2308 [2021-11-25 19:30:14,724 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7621 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=6213, Invalid=26007, Unknown=0, NotChecked=0, Total=32220 [2021-11-25 19:30:14,724 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 1849 mSDsluCounter, 384 mSDsCounter, 0 mSdLazyCounter, 2547 mSolverCounterSat, 518 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1849 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 3065 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 518 IncrementalHoareTripleChecker+Valid, 2547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:14,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1849 Valid, 400 Invalid, 3065 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [518 Valid, 2547 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 19:30:14,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2308 states. [2021-11-25 19:30:14,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2308 to 1369. [2021-11-25 19:30:14,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1369 states, 1366 states have (on average 1.1405563689604685) internal successors, (1558), 1368 states have internal predecessors, (1558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:14,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1369 states to 1369 states and 1558 transitions. [2021-11-25 19:30:14,760 INFO L78 Accepts]: Start accepts. Automaton has 1369 states and 1558 transitions. Word has length 61 [2021-11-25 19:30:14,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:14,760 INFO L470 AbstractCegarLoop]: Abstraction has 1369 states and 1558 transitions. [2021-11-25 19:30:14,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 2.671641791044776) internal successors, (179), 68 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:14,761 INFO L276 IsEmpty]: Start isEmpty. Operand 1369 states and 1558 transitions. [2021-11-25 19:30:14,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 19:30:14,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:14,764 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:30:14,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-25 19:30:14,977 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:14,977 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:30:14,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:14,977 INFO L85 PathProgramCache]: Analyzing trace with hash 104943707, now seen corresponding path program 15 times [2021-11-25 19:30:14,978 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:14,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326023622] [2021-11-25 19:30:14,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:14,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:15,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:15,673 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 143 proven. 210 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:30:15,673 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:15,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326023622] [2021-11-25 19:30:15,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326023622] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:15,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271560854] [2021-11-25 19:30:15,674 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:30:15,675 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:15,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:15,676 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:15,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-25 19:30:15,970 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:30:15,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:30:15,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-25 19:30:15,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:30:16,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:18,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:18,965 INFO L354 Elim1Store]: treesize reduction 98, result has 31.0 percent of original size [2021-11-25 19:30:18,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 55 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 118 treesize of output 90 [2021-11-25 19:30:19,088 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 143 proven. 210 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:30:19,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:30:21,653 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 164 treesize of output 142 [2021-11-25 19:30:21,669 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,670 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,670 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,671 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,671 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,672 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,672 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,673 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,673 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,675 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,675 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,676 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,676 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,677 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,677 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,678 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,678 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,679 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,679 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,680 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,680 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,681 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,681 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,682 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,682 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,683 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,684 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,684 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,685 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,685 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,686 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,686 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,687 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,687 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,688 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,688 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,689 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,689 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,690 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,690 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,691 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,691 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,692 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,692 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,693 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,693 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,694 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,695 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,695 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,696 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,696 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,697 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,697 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:21,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 11 select indices, 11 select index equivalence classes, 55 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 270 treesize of output 228 [2021-11-25 19:30:23,418 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 253 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:30:23,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271560854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:30:23,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [718626009] [2021-11-25 19:30:23,419 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:30:23,420 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:30:23,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:30:23,420 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:30:23,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:30:23,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:23,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:23,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:30:23,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:23,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:23,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:23,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:23,676 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:30:23,677 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 19:30:23,796 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:30:25,724 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '97033#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:30:25,724 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:30:25,725 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:30:25,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 37, 37] total 94 [2021-11-25 19:30:25,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723844165] [2021-11-25 19:30:25,725 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:30:25,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-25 19:30:25,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:25,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-25 19:30:25,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=984, Invalid=9318, Unknown=0, NotChecked=0, Total=10302 [2021-11-25 19:30:25,726 INFO L87 Difference]: Start difference. First operand 1369 states and 1558 transitions. Second operand has 94 states, 94 states have (on average 1.5) internal successors, (141), 94 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:30,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:30,053 INFO L93 Difference]: Finished difference Result 1624 states and 1840 transitions. [2021-11-25 19:30:30,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-25 19:30:30,053 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.5) internal successors, (141), 94 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-25 19:30:30,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:30,055 INFO L225 Difference]: With dead ends: 1624 [2021-11-25 19:30:30,055 INFO L226 Difference]: Without dead ends: 1552 [2021-11-25 19:30:30,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6288 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=1811, Invalid=19358, Unknown=1, NotChecked=0, Total=21170 [2021-11-25 19:30:30,056 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 222 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 1034 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 1391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1034 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 339 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:30,057 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [222 Valid, 224 Invalid, 1391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1034 Invalid, 0 Unknown, 339 Unchecked, 0.6s Time] [2021-11-25 19:30:30,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1552 states. [2021-11-25 19:30:30,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1552 to 1531. [2021-11-25 19:30:30,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1531 states, 1528 states have (on average 1.1426701570680629) internal successors, (1746), 1530 states have internal predecessors, (1746), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:30,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1531 states to 1531 states and 1746 transitions. [2021-11-25 19:30:30,073 INFO L78 Accepts]: Start accepts. Automaton has 1531 states and 1746 transitions. Word has length 61 [2021-11-25 19:30:30,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:30,074 INFO L470 AbstractCegarLoop]: Abstraction has 1531 states and 1746 transitions. [2021-11-25 19:30:30,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.5) internal successors, (141), 94 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:30,074 INFO L276 IsEmpty]: Start isEmpty. Operand 1531 states and 1746 transitions. [2021-11-25 19:30:30,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-25 19:30:30,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:30,076 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:30:30,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-25 19:30:30,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:30,297 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:30:30,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:30,297 INFO L85 PathProgramCache]: Analyzing trace with hash -1517034610, now seen corresponding path program 14 times [2021-11-25 19:30:30,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:30,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879812023] [2021-11-25 19:30:30,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:30,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:30,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:31,433 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 18 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:30:31,434 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:31,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879812023] [2021-11-25 19:30:31,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879812023] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:31,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [223324283] [2021-11-25 19:30:31,434 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:30:31,434 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:31,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:31,435 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:31,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-25 19:30:32,270 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-25 19:30:32,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:30:32,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 163 conjunts are in the unsatisfiable core [2021-11-25 19:30:32,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:30:32,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:30:32,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:32,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:30:32,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:30:33,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:30:33,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:30:33,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:30:33,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:30:33,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:30:33,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 19:30:33,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:30:33,595 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 15 treesize of output 7 [2021-11-25 19:30:33,601 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 18 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:30:33,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:30:33,617 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3060 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) |c_ULTIMATE.start_cstrcat_~append#1.offset|) 0)) is different from false [2021-11-25 19:30:33,624 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3060 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:30:33,632 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3059 (Array Int Int)) (v_ArrVal_3060 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_3059) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 1)) 0)) is different from false [2021-11-25 19:30:33,639 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3060 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 2 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:30:33,646 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3058 (Array Int Int)) (v_ArrVal_3060 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_3058) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 2 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:30:33,654 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3060 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 3 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:30:33,661 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3057 (Array Int Int)) (v_ArrVal_3060 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_3057) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 3 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:30:33,669 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3060 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 4)) 0)) is different from false [2021-11-25 19:30:33,679 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3056 (Array Int Int)) (v_ArrVal_3060 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_3056) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 4)) 0)) is different from false [2021-11-25 19:30:33,686 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3060 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 5 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:30:33,694 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3055 (Array Int Int)) (v_ArrVal_3060 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_3055) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 5 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:30:33,702 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3060 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 6 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:30:33,709 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3054 (Array Int Int)) (v_ArrVal_3060 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_3054) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 6 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:30:33,717 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3060 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 7 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:30:33,726 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3053 (Array Int Int)) (v_ArrVal_3060 (Array Int Int))) (= (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_#t~post4#1.base| v_ArrVal_3053) |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ 7 |c_ULTIMATE.start_cstrcat_~append#1.offset|)) 0)) is different from false [2021-11-25 19:30:33,734 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3060 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3060) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |c_ULTIMATE.start_cstrcat_~append#1.offset| 8)) 0)) is different from false [2021-11-25 19:30:33,744 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3060 (Array Int Int))) (= 0 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_3060) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 8)))) is different from false [2021-11-25 19:30:33,749 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:30:33,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:30:33,754 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:30:33,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:30:33,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:30:34,039 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 18 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 143 not checked. [2021-11-25 19:30:34,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [223324283] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:30:34,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [52772037] [2021-11-25 19:30:34,040 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:30:34,040 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:30:34,041 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:30:34,041 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:30:34,041 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:30:34,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:34,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:34,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:30:34,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:34,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:34,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:34,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:34,294 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:30:34,295 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 19:30:34,398 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:34,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:34,428 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:30:34,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:30:34,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:30:34,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:30:34,681 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:30:37,536 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '100733#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:30:37,537 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:30:37,537 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:30:37,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 33, 33] total 83 [2021-11-25 19:30:37,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286309549] [2021-11-25 19:30:37,537 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:30:37,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-25 19:30:37,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:37,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-25 19:30:37,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=5923, Unknown=17, NotChecked=2890, Total=9120 [2021-11-25 19:30:37,538 INFO L87 Difference]: Start difference. First operand 1531 states and 1746 transitions. Second operand has 83 states, 83 states have (on average 1.8072289156626506) internal successors, (150), 83 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:40,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:40,563 INFO L93 Difference]: Finished difference Result 1713 states and 1949 transitions. [2021-11-25 19:30:40,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-25 19:30:40,564 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.8072289156626506) internal successors, (150), 83 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-25 19:30:40,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:40,567 INFO L225 Difference]: With dead ends: 1713 [2021-11-25 19:30:40,567 INFO L226 Difference]: Without dead ends: 1601 [2021-11-25 19:30:40,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 128 SyntacticMatches, 18 SemanticMatches, 113 ConstructedPredicates, 17 IntricatePredicates, 1 DeprecatedPredicates, 2577 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=410, Invalid=9147, Unknown=17, NotChecked=3536, Total=13110 [2021-11-25 19:30:40,569 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 85 mSDsluCounter, 1188 mSDsCounter, 0 mSdLazyCounter, 2783 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 780 SdHoareTripleChecker+Invalid, 4245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 2783 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1440 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:40,569 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 780 Invalid, 4245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 2783 Invalid, 0 Unknown, 1440 Unchecked, 1.3s Time] [2021-11-25 19:30:40,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1601 states. [2021-11-25 19:30:40,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1601 to 1600. [2021-11-25 19:30:40,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1600 states, 1597 states have (on average 1.1440200375704446) internal successors, (1827), 1599 states have internal predecessors, (1827), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:40,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1600 states to 1600 states and 1827 transitions. [2021-11-25 19:30:40,591 INFO L78 Accepts]: Start accepts. Automaton has 1600 states and 1827 transitions. Word has length 62 [2021-11-25 19:30:40,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:40,591 INFO L470 AbstractCegarLoop]: Abstraction has 1600 states and 1827 transitions. [2021-11-25 19:30:40,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.8072289156626506) internal successors, (150), 83 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:40,592 INFO L276 IsEmpty]: Start isEmpty. Operand 1600 states and 1827 transitions. [2021-11-25 19:30:40,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 19:30:40,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:40,595 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:30:40,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-25 19:30:40,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable72 [2021-11-25 19:30:40,817 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:30:40,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:40,817 INFO L85 PathProgramCache]: Analyzing trace with hash -274110340, now seen corresponding path program 16 times [2021-11-25 19:30:40,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:40,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989823128] [2021-11-25 19:30:40,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:40,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:40,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:41,419 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 132 proven. 253 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:30:41,419 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:41,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989823128] [2021-11-25 19:30:41,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989823128] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:41,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251813354] [2021-11-25 19:30:41,420 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:30:41,420 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:41,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:41,421 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:41,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-25 19:30:41,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:41,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-25 19:30:41,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:30:42,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:42,220 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 15 treesize of output 7 [2021-11-25 19:30:42,235 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 132 proven. 253 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:30:42,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:30:42,330 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 15 treesize of output 13 [2021-11-25 19:30:42,332 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 26 treesize of output 22 [2021-11-25 19:30:42,509 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 132 proven. 253 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:30:42,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [251813354] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:30:42,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [512532655] [2021-11-25 19:30:42,510 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:30:42,510 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:30:42,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:30:42,511 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:30:42,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:30:42,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:42,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:42,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:30:42,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:42,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:42,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:42,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:42,767 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:30:42,767 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 19:30:42,878 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:30:44,127 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '104532#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:30:44,128 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:30:44,128 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:30:44,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 48 [2021-11-25 19:30:44,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150077293] [2021-11-25 19:30:44,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:30:44,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 19:30:44,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:44,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 19:30:44,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=2911, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 19:30:44,129 INFO L87 Difference]: Start difference. First operand 1600 states and 1827 transitions. Second operand has 48 states, 48 states have (on average 1.875) internal successors, (90), 48 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:47,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:47,140 INFO L93 Difference]: Finished difference Result 4620 states and 4951 transitions. [2021-11-25 19:30:47,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 19:30:47,141 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.875) internal successors, (90), 48 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-25 19:30:47,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:47,148 INFO L225 Difference]: With dead ends: 4620 [2021-11-25 19:30:47,148 INFO L226 Difference]: Without dead ends: 4568 [2021-11-25 19:30:47,149 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 160 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1346 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=428, Invalid=6214, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 19:30:47,149 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 382 mSDsluCounter, 3366 mSDsCounter, 0 mSdLazyCounter, 4670 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 3239 SdHoareTripleChecker+Invalid, 4916 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 4670 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 134 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:47,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [382 Valid, 3239 Invalid, 4916 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 4670 Invalid, 0 Unknown, 134 Unchecked, 2.0s Time] [2021-11-25 19:30:47,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4568 states. [2021-11-25 19:30:47,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4568 to 1806. [2021-11-25 19:30:47,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1806 states, 1803 states have (on average 1.1464226289517472) internal successors, (2067), 1805 states have internal predecessors, (2067), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:47,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1806 states to 1806 states and 2067 transitions. [2021-11-25 19:30:47,186 INFO L78 Accepts]: Start accepts. Automaton has 1806 states and 2067 transitions. Word has length 63 [2021-11-25 19:30:47,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:47,187 INFO L470 AbstractCegarLoop]: Abstraction has 1806 states and 2067 transitions. [2021-11-25 19:30:47,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.875) internal successors, (90), 48 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:30:47,187 INFO L276 IsEmpty]: Start isEmpty. Operand 1806 states and 2067 transitions. [2021-11-25 19:30:47,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 19:30:47,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:47,190 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:30:47,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-25 19:30:47,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:47,413 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:30:47,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:47,413 INFO L85 PathProgramCache]: Analyzing trace with hash -983758852, now seen corresponding path program 15 times [2021-11-25 19:30:47,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:47,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839394050] [2021-11-25 19:30:47,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:47,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:47,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:47,911 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 49 proven. 194 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:30:47,911 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:47,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839394050] [2021-11-25 19:30:47,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839394050] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:47,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130895478] [2021-11-25 19:30:47,911 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:30:47,911 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:47,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:47,912 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:47,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-25 19:30:48,138 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:30:48,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:30:48,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 156 conjunts are in the unsatisfiable core [2021-11-25 19:30:48,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:30:48,160 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:30:48,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:30:48,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-11-25 19:30:48,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:30:48,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:30:48,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:30:49,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:30:49,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:30:49,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:30:49,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:30:49,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:30:49,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:30:49,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 19:30:50,099 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:30:50,099 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 21 treesize of output 21 [2021-11-25 19:30:50,325 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 72 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:30:50,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:30:52,203 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrcat_#t~post5#1.offset_519| Int) (v_ArrVal_3228 (Array Int Int))) (or (<= (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_519| 10) (select |c_#length| |c_ULTIMATE.start_cstrcat_~append#1.base|)) (< |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_519| 0) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcat_~s#1.base| v_ArrVal_3228) |c_ULTIMATE.start_cstrcat_~append#1.base|) (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_519| 8)) 0) (< |c_ULTIMATE.start_cstrcat_~append#1.offset| |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_519|))) is different from false [2021-11-25 19:30:52,245 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrcat_#t~post5#1.offset_519| Int) (v_ArrVal_3228 (Array Int Int))) (or (<= (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_519| 10) (select |c_#length| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (< |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_519| 0) (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_519|) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_3228) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |v_ULTIMATE.start_cstrcat_#t~post5#1.offset_519| 8)) 0))) is different from false [2021-11-25 19:30:52,255 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:30:52,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 19:30:52,261 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:30:52,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 19:30:52,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:30:54,054 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 81 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 9 not checked. [2021-11-25 19:30:54,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130895478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:30:54,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1660990741] [2021-11-25 19:30:54,055 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:30:54,055 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:30:54,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:30:54,056 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:30:54,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:30:54,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:54,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:30:54,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:30:54,152 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 11 treesize of output 7 [2021-11-25 19:30:54,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:54,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:54,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:30:54,325 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:30:54,326 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 19:30:54,453 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:54,454 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:30:54,484 INFO L354 Elim1Store]: treesize reduction 84, result has 23.6 percent of original size [2021-11-25 19:30:54,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 46 treesize of output 45 [2021-11-25 19:30:54,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:30:54,675 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 11 treesize of output 7 [2021-11-25 19:30:54,747 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:30:58,535 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '111487#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_cstrcat_~s#1.offset| (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1)) (<= |ULTIMATE.start_main_~length3~0#1| 1) (= |ULTIMATE.start_cstrcat_~s#1.base| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrcat_~append#1.base| |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (= (+ |ULTIMATE.start_cstrcat_#t~post5#1.offset| 1) |ULTIMATE.start_cstrcat_~append#1.offset|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:30:58,536 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:30:58,536 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:30:58,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 34, 34] total 90 [2021-11-25 19:30:58,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366817428] [2021-11-25 19:30:58,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:30:58,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-25 19:30:58,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:58,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-25 19:30:58,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=842, Invalid=9460, Unknown=8, NotChecked=402, Total=10712 [2021-11-25 19:30:58,538 INFO L87 Difference]: Start difference. First operand 1806 states and 2067 transitions. Second operand has 91 states, 90 states have (on average 2.111111111111111) internal successors, (190), 91 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:31:12,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:31:12,747 INFO L93 Difference]: Finished difference Result 2683 states and 3008 transitions. [2021-11-25 19:31:12,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-11-25 19:31:12,748 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 90 states have (on average 2.111111111111111) internal successors, (190), 91 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-25 19:31:12,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:31:12,752 INFO L225 Difference]: With dead ends: 2683 [2021-11-25 19:31:12,752 INFO L226 Difference]: Without dead ends: 2683 [2021-11-25 19:31:12,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 128 SyntacticMatches, 16 SemanticMatches, 202 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 9070 ImplicationChecksByTransitivity, 20.4s TimeCoverageRelationStatistics Valid=6251, Invalid=34293, Unknown=66, NotChecked=802, Total=41412 [2021-11-25 19:31:12,756 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 1129 mSDsluCounter, 880 mSDsCounter, 0 mSdLazyCounter, 2832 mSolverCounterSat, 403 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1129 SdHoareTripleChecker+Valid, 672 SdHoareTripleChecker+Invalid, 5648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 403 IncrementalHoareTripleChecker+Valid, 2832 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2413 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:31:12,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1129 Valid, 672 Invalid, 5648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [403 Valid, 2832 Invalid, 0 Unknown, 2413 Unchecked, 1.8s Time] [2021-11-25 19:31:12,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2683 states. [2021-11-25 19:31:12,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2683 to 1793. [2021-11-25 19:31:12,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1793 states, 1790 states have (on average 1.146927374301676) internal successors, (2053), 1792 states have internal predecessors, (2053), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:31:12,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1793 states to 1793 states and 2053 transitions. [2021-11-25 19:31:12,793 INFO L78 Accepts]: Start accepts. Automaton has 1793 states and 2053 transitions. Word has length 64 [2021-11-25 19:31:12,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:31:12,793 INFO L470 AbstractCegarLoop]: Abstraction has 1793 states and 2053 transitions. [2021-11-25 19:31:12,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 90 states have (on average 2.111111111111111) internal successors, (190), 91 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:31:12,794 INFO L276 IsEmpty]: Start isEmpty. Operand 1793 states and 2053 transitions. [2021-11-25 19:31:12,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 19:31:12,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:31:12,798 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:31:12,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-25 19:31:13,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-11-25 19:31:13,013 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:31:13,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:31:13,029 INFO L85 PathProgramCache]: Analyzing trace with hash 527170653, now seen corresponding path program 17 times [2021-11-25 19:31:13,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:31:13,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888218162] [2021-11-25 19:31:13,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:31:13,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:31:13,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:31:13,734 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 117 proven. 300 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:31:13,734 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:31:13,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888218162] [2021-11-25 19:31:13,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1888218162] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:31:13,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541628781] [2021-11-25 19:31:13,734 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:31:13,734 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:31:13,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:31:13,735 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:31:13,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-25 19:31:14,311 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-25 19:31:14,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:31:14,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-25 19:31:14,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:31:14,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:14,978 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 15 treesize of output 7 [2021-11-25 19:31:14,994 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 117 proven. 300 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:31:14,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:31:15,100 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 15 treesize of output 13 [2021-11-25 19:31:15,101 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 26 treesize of output 22 [2021-11-25 19:31:15,342 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 117 proven. 300 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:31:15,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541628781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:31:15,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [598389222] [2021-11-25 19:31:15,344 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 19:31:15,344 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:31:15,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:31:15,344 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:31:15,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:31:15,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:31:15,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:31:15,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:31:15,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:15,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:15,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:15,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:15,607 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:31:15,607 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 19:31:15,727 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:31:17,138 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '116643#(and (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_~s#1.base|) (+ |ULTIMATE.start_cstrcat_~s#1.offset| 1)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (<= |ULTIMATE.start_cstrcat_~append#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:31:17,138 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:31:17,138 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:31:17,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 51 [2021-11-25 19:31:17,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922675448] [2021-11-25 19:31:17,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:31:17,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-25 19:31:17,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:31:17,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-25 19:31:17,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=3245, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 19:31:17,140 INFO L87 Difference]: Start difference. First operand 1793 states and 2053 transitions. Second operand has 51 states, 51 states have (on average 1.8823529411764706) internal successors, (96), 51 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:31:20,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:31:20,906 INFO L93 Difference]: Finished difference Result 5015 states and 5385 transitions. [2021-11-25 19:31:20,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-25 19:31:20,906 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.8823529411764706) internal successors, (96), 51 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-25 19:31:20,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:31:20,910 INFO L225 Difference]: With dead ends: 5015 [2021-11-25 19:31:20,910 INFO L226 Difference]: Without dead ends: 4959 [2021-11-25 19:31:20,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 165 SyntacticMatches, 3 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1505 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=455, Invalid=7027, Unknown=0, NotChecked=0, Total=7482 [2021-11-25 19:31:20,911 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 535 mSDsluCounter, 3525 mSDsCounter, 0 mSdLazyCounter, 4895 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 535 SdHoareTripleChecker+Valid, 3398 SdHoareTripleChecker+Invalid, 5184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 4895 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 184 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:31:20,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [535 Valid, 3398 Invalid, 5184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 4895 Invalid, 0 Unknown, 184 Unchecked, 2.4s Time] [2021-11-25 19:31:20,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4959 states. [2021-11-25 19:31:20,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4959 to 1999. [2021-11-25 19:31:20,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1999 states, 1996 states have (on average 1.1523046092184368) internal successors, (2300), 1998 states have internal predecessors, (2300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:31:20,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1999 states to 1999 states and 2300 transitions. [2021-11-25 19:31:20,944 INFO L78 Accepts]: Start accepts. Automaton has 1999 states and 2300 transitions. Word has length 65 [2021-11-25 19:31:20,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:31:20,944 INFO L470 AbstractCegarLoop]: Abstraction has 1999 states and 2300 transitions. [2021-11-25 19:31:20,944 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.8823529411764706) internal successors, (96), 51 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:31:20,945 INFO L276 IsEmpty]: Start isEmpty. Operand 1999 states and 2300 transitions. [2021-11-25 19:31:20,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 19:31:20,947 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:31:20,947 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:31:20,974 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-25 19:31:21,148 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:31:21,149 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:31:21,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:31:21,149 INFO L85 PathProgramCache]: Analyzing trace with hash -621658712, now seen corresponding path program 12 times [2021-11-25 19:31:21,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:31:21,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836056722] [2021-11-25 19:31:21,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:31:21,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:31:21,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:31:21,752 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 36 proven. 202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:31:21,752 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:31:21,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836056722] [2021-11-25 19:31:21,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836056722] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:31:21,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122211631] [2021-11-25 19:31:21,752 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:31:21,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:31:21,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:31:21,753 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:31:21,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-25 19:31:22,020 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:31:22,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:31:22,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-25 19:31:22,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:31:22,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:31:22,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:31:22,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-11-25 19:31:23,065 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 154 proven. 81 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:31:23,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:31:24,171 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 153 proven. 82 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:31:24,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122211631] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:31:24,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1735489049] [2021-11-25 19:31:24,173 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:31:24,173 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:31:24,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:31:24,173 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:31:24,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:31:24,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:31:24,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:31:24,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:31:24,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:31:24,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:24,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:24,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:31:24,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:24,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:24,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:24,527 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:31:24,527 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 19:31:24,718 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:31:24,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:31:24,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:31:24,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:31:25,063 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:31:28,758 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '124185#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:31:28,758 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:31:28,759 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:31:28,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 68 [2021-11-25 19:31:28,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118896609] [2021-11-25 19:31:28,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:31:28,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-25 19:31:28,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:31:28,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-25 19:31:28,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=484, Invalid=6158, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 19:31:28,760 INFO L87 Difference]: Start difference. First operand 1999 states and 2300 transitions. Second operand has 68 states, 68 states have (on average 2.764705882352941) internal successors, (188), 68 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:31:45,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:31:45,100 INFO L93 Difference]: Finished difference Result 3443 states and 3799 transitions. [2021-11-25 19:31:45,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 260 states. [2021-11-25 19:31:45,101 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.764705882352941) internal successors, (188), 68 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-25 19:31:45,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:31:45,102 INFO L225 Difference]: With dead ends: 3443 [2021-11-25 19:31:45,102 INFO L226 Difference]: Without dead ends: 3021 [2021-11-25 19:31:45,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 143 SyntacticMatches, 1 SemanticMatches, 338 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39379 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=10841, Invalid=104419, Unknown=0, NotChecked=0, Total=115260 [2021-11-25 19:31:45,107 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 1793 mSDsluCounter, 2616 mSDsCounter, 0 mSdLazyCounter, 11395 mSolverCounterSat, 417 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1793 SdHoareTripleChecker+Valid, 2562 SdHoareTripleChecker+Invalid, 11812 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 417 IncrementalHoareTripleChecker+Valid, 11395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:31:45,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1793 Valid, 2562 Invalid, 11812 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [417 Valid, 11395 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-25 19:31:45,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3021 states. [2021-11-25 19:31:45,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3021 to 2179. [2021-11-25 19:31:45,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2179 states, 2176 states have (on average 1.1553308823529411) internal successors, (2514), 2178 states have internal predecessors, (2514), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:31:45,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2179 states to 2179 states and 2514 transitions. [2021-11-25 19:31:45,126 INFO L78 Accepts]: Start accepts. Automaton has 2179 states and 2514 transitions. Word has length 67 [2021-11-25 19:31:45,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:31:45,127 INFO L470 AbstractCegarLoop]: Abstraction has 2179 states and 2514 transitions. [2021-11-25 19:31:45,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 2.764705882352941) internal successors, (188), 68 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:31:45,127 INFO L276 IsEmpty]: Start isEmpty. Operand 2179 states and 2514 transitions. [2021-11-25 19:31:45,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 19:31:45,129 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:31:45,129 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:31:45,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-25 19:31:45,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:31:45,330 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:31:45,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:31:45,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1282261734, now seen corresponding path program 13 times [2021-11-25 19:31:45,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:31:45,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113083716] [2021-11-25 19:31:45,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:31:45,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:31:45,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:31:46,049 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 81 proven. 186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:31:46,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:31:46,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113083716] [2021-11-25 19:31:46,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113083716] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:31:46,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398398506] [2021-11-25 19:31:46,050 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:31:46,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:31:46,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:31:46,051 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:31:46,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0947c09a-6763-4772-b034-7cbddb073ce2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-25 19:31:46,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:31:46,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 94 conjunts are in the unsatisfiable core [2021-11-25 19:31:46,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:31:46,415 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:31:46,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:31:47,883 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 101 proven. 166 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:31:47,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:31:49,721 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 125 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:31:49,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398398506] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:31:49,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1760936847] [2021-11-25 19:31:49,722 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:31:49,722 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:31:49,722 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:31:49,723 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:31:49,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:31:49,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:31:49,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:31:49,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:31:49,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:49,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:49,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:49,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:31:49,925 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 14 treesize of output 10 [2021-11-25 19:31:49,949 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 14 treesize of output 10 [2021-11-25 19:31:49,985 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:31:49,985 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 19:31:50,165 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-25 19:31:50,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-25 19:31:50,231 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 11 treesize of output 7 [2021-11-25 19:31:50,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:31:50,521 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:31:54,675 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '130826#(and (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcat_#t~post4#1.base|) (+ |ULTIMATE.start_cstrcat_#t~post4#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483646) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_cstrcat_#in~append#1.offset| 0) (<= |ULTIMATE.start_cstrcat_~save~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~s#1.base|) (<= 0 |ULTIMATE.start_cstrcat_~append#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= |ULTIMATE.start_cstrcat_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.base|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_~save~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_cstrcat_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~append#1.offset|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_cstrcat_~append#1.offset|) (<= |ULTIMATE.start_main_~length3~0#1| 2147483646) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrcat_#t~post5#1.offset|) (<= 0 |ULTIMATE.start_cstrcat_#in~s#1.base|) (= |ULTIMATE.start_main_#t~malloc11#1.offset| 0) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= 1 |ULTIMATE.start_main_~length3~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc10#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:31:54,676 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:31:54,676 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:31:54,676 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 92 [2021-11-25 19:31:54,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332307946] [2021-11-25 19:31:54,676 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:31:54,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-11-25 19:31:54,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:31:54,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-11-25 19:31:54,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=928, Invalid=10414, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 19:31:54,677 INFO L87 Difference]: Start difference. First operand 2179 states and 2514 transitions. Second operand has 93 states, 92 states have (on average 2.1630434782608696) internal successors, (199), 93 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)