./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/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_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/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_7ecc3ba5-f78d-47a7-8e36-1196d57be429/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 007fc8a389a67fb47c7d326d3f1d284696dfe5de13661e77d6d1bf7cce285194 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:55:48,184 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:55:48,186 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:55:48,240 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:55:48,241 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:55:48,246 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:55:48,248 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:55:48,252 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:55:48,255 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:55:48,262 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:55:48,263 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:55:48,265 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:55:48,266 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:55:48,269 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:55:48,271 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:55:48,276 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:55:48,278 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:55:48,279 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:55:48,282 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:55:48,292 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:55:48,294 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:55:48,296 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:55:48,299 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:55:48,300 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:55:48,304 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:55:48,304 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:55:48,305 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:55:48,306 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:55:48,307 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:55:48,309 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:55:48,309 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:55:48,310 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:55:48,312 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:55:48,314 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:55:48,315 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:55:48,315 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:55:48,316 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:55:48,316 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:55:48,317 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:55:48,318 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:55:48,318 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:55:48,319 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-25 19:55:48,382 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:55:48,386 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:55:48,387 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:55:48,387 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:55:48,388 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:55:48,388 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:55:48,389 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:55:48,389 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:55:48,389 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:55:48,389 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:55:48,390 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:55:48,391 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:55:48,391 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:55:48,391 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:55:48,391 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:55:48,392 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:55:48,392 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:55:48,392 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:55:48,393 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 19:55:48,393 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 19:55:48,393 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:55:48,393 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:55:48,394 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 19:55:48,395 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:55:48,395 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:55:48,396 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:55:48,396 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 19:55:48,396 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 19:55:48,396 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 19:55:48,397 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:55:48,404 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 19:55:48,404 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:55:48,404 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:55:48,404 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:55:48,405 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:55:48,405 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:55:48,405 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:55:48,405 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:55:48,406 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:55:48,406 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:55:48,406 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:55:48,407 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:55:48,407 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_7ecc3ba5-f78d-47a7-8e36-1196d57be429/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 007fc8a389a67fb47c7d326d3f1d284696dfe5de13661e77d6d1bf7cce285194 [2021-11-25 19:55:48,719 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:55:48,739 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:55:48,741 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:55:48,742 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:55:48,743 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:55:48,744 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i [2021-11-25 19:55:48,798 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/data/63c40906e/f2080aca7cb1409499686f2c57f09b95/FLAG9e0dc3296 [2021-11-25 19:55:49,342 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:55:49,342 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i [2021-11-25 19:55:49,362 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/data/63c40906e/f2080aca7cb1409499686f2c57f09b95/FLAG9e0dc3296 [2021-11-25 19:55:49,684 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/data/63c40906e/f2080aca7cb1409499686f2c57f09b95 [2021-11-25 19:55:49,686 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:55:49,687 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:55:49,689 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:55:49,689 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:55:49,693 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:55:49,693 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:55:49" (1/1) ... [2021-11-25 19:55:49,694 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b380c5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:49, skipping insertion in model container [2021-11-25 19:55:49,695 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:55:49" (1/1) ... [2021-11-25 19:55:49,710 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:55:49,745 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:55:50,037 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:55:50,045 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:55:50,079 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:55:50,106 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:55:50,106 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50 WrapperNode [2021-11-25 19:55:50,107 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:55:50,108 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:55:50,108 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:55:50,108 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:55:50,118 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (1/1) ... [2021-11-25 19:55:50,135 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (1/1) ... [2021-11-25 19:55:50,165 INFO L137 Inliner]: procedures = 117, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2021-11-25 19:55:50,165 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:55:50,167 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:55:50,167 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:55:50,168 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:55:50,176 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (1/1) ... [2021-11-25 19:55:50,176 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (1/1) ... [2021-11-25 19:55:50,196 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (1/1) ... [2021-11-25 19:55:50,196 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (1/1) ... [2021-11-25 19:55:50,201 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (1/1) ... [2021-11-25 19:55:50,211 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (1/1) ... [2021-11-25 19:55:50,215 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (1/1) ... [2021-11-25 19:55:50,223 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:55:50,223 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:55:50,228 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:55:50,229 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:55:50,230 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (1/1) ... [2021-11-25 19:55:50,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:55:50,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:50,264 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:55:50,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:55:50,317 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 19:55:50,319 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 19:55:50,319 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 19:55:50,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 19:55:50,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:55:50,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:55:50,408 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:55:50,410 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:55:50,704 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:55:50,752 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:55:50,753 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 19:55:50,755 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:55:50 BoogieIcfgContainer [2021-11-25 19:55:50,755 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:55:50,757 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:55:50,757 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:55:50,763 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:55:50,763 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:55:49" (1/3) ... [2021-11-25 19:55:50,764 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57503c70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:55:50, skipping insertion in model container [2021-11-25 19:55:50,764 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:55:50" (2/3) ... [2021-11-25 19:55:50,764 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57503c70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:55:50, skipping insertion in model container [2021-11-25 19:55:50,764 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:55:50" (3/3) ... [2021-11-25 19:55:50,766 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cmemchr-alloca-2.i [2021-11-25 19:55:50,771 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:55:50,771 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2021-11-25 19:55:50,815 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:55:50,822 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 19:55:50,822 INFO L340 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-11-25 19:55:50,835 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:50,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 19:55:50,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:50,842 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 19:55:50,842 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:55:50,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:50,848 INFO L85 PathProgramCache]: Analyzing trace with hash 107409, now seen corresponding path program 1 times [2021-11-25 19:55:50,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:50,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832890554] [2021-11-25 19:55:50,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:50,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:50,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:51,024 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 19:55:51,025 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:51,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832890554] [2021-11-25 19:55:51,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832890554] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:51,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:55:51,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 19:55:51,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682765015] [2021-11-25 19:55:51,029 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:51,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:55:51,034 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:51,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:55:51,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:55:51,063 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:51,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:51,096 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2021-11-25 19:55:51,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:55:51,098 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 19:55:51,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:51,106 INFO L225 Difference]: With dead ends: 16 [2021-11-25 19:55:51,106 INFO L226 Difference]: Without dead ends: 15 [2021-11-25 19:55:51,108 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 19:55:51,111 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:51,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 10 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:55:51,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-25 19:55:51,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-25 19:55:51,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:51,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-25 19:55:51,143 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 3 [2021-11-25 19:55:51,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:51,143 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-25 19:55:51,143 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 19:55:51,144 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-25 19:55:51,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 19:55:51,144 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:51,144 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 19:55:51,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:55:51,145 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:55:51,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:51,146 INFO L85 PathProgramCache]: Analyzing trace with hash 107410, now seen corresponding path program 1 times [2021-11-25 19:55:51,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:51,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076407819] [2021-11-25 19:55:51,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:51,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:51,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:51,245 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 19:55:51,246 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:51,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076407819] [2021-11-25 19:55:51,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076407819] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:51,248 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:55:51,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:55:51,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019299677] [2021-11-25 19:55:51,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:51,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:55:51,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:51,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:55:51,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:55:51,251 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:51,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:51,305 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2021-11-25 19:55:51,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:55:51,306 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-25 19:55:51,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:51,307 INFO L225 Difference]: With dead ends: 17 [2021-11-25 19:55:51,308 INFO L226 Difference]: Without dead ends: 17 [2021-11-25 19:55:51,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:55:51,315 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:51,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 33 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:55:51,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-25 19:55:51,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-25 19:55:51,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 16 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:51,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-11-25 19:55:51,329 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 3 [2021-11-25 19:55:51,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:51,329 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-11-25 19:55:51,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:51,330 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-11-25 19:55:51,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 19:55:51,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:51,331 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-25 19:55:51,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:55:51,336 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:55:51,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:51,337 INFO L85 PathProgramCache]: Analyzing trace with hash 103264033, now seen corresponding path program 1 times [2021-11-25 19:55:51,337 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:51,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254912097] [2021-11-25 19:55:51,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:51,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:51,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:51,496 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 19:55:51,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:51,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254912097] [2021-11-25 19:55:51,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254912097] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:51,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [462237016] [2021-11-25 19:55:51,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:51,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:51,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:51,503 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:51,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:55:51,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:51,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:55:51,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:51,701 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:55:51,804 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 19:55:51,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:55:51,977 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 19:55:51,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [462237016] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:55:51,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [736587222] [2021-11-25 19:55:52,001 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-25 19:55:52,002 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:55:52,006 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:55:52,011 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:55:52,011 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:55:52,117 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 6 treesize of output 5 [2021-11-25 19:55:52,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 19:55:52,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:55:52,375 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:55:52,613 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '128#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet10#1| 127) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_main_~nondetArea~0#1.base|) (+ |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~nondetArea~0#1.offset| 1)) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet10#1|)) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:55:52,613 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:55:52,613 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:55:52,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 8 [2021-11-25 19:55:52,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402227674] [2021-11-25 19:55:52,614 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:55:52,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:55:52,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:52,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:55:52,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:55:52,616 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 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 19:55:52,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:52,692 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2021-11-25 19:55:52,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:55:52,692 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 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 5 [2021-11-25 19:55:52,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:52,693 INFO L225 Difference]: With dead ends: 16 [2021-11-25 19:55:52,693 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 19:55:52,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:55:52,695 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 74 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:52,696 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 30 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:55:52,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 19:55:52,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2021-11-25 19:55:52,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 12 states have (on average 1.5) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:52,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-25 19:55:52,699 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 5 [2021-11-25 19:55:52,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:52,699 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-25 19:55:52,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 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 19:55:52,700 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-25 19:55:52,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 19:55:52,700 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:52,700 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:55:52,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:55:52,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:52,915 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:55:52,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:52,916 INFO L85 PathProgramCache]: Analyzing trace with hash 454047929, now seen corresponding path program 1 times [2021-11-25 19:55:52,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:52,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023990254] [2021-11-25 19:55:52,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:52,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:52,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:52,994 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 19:55:52,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:52,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023990254] [2021-11-25 19:55:52,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023990254] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:52,995 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:55:52,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:55:52,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721646253] [2021-11-25 19:55:52,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:52,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:55:52,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:52,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:55:52,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:55:52,998 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:53,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:53,061 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2021-11-25 19:55:53,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:55:53,062 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 19:55:53,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:53,063 INFO L225 Difference]: With dead ends: 16 [2021-11-25 19:55:53,063 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 19:55:53,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:55:53,067 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 26 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:53,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 17 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:55:53,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 19:55:53,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2021-11-25 19:55:53,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:53,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-11-25 19:55:53,074 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 7 [2021-11-25 19:55:53,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:53,074 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-11-25 19:55:53,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:53,075 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-11-25 19:55:53,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 19:55:53,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:53,075 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:55:53,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 19:55:53,076 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:55:53,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:53,077 INFO L85 PathProgramCache]: Analyzing trace with hash 454047930, now seen corresponding path program 1 times [2021-11-25 19:55:53,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:53,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354819692] [2021-11-25 19:55:53,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:53,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:53,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:53,227 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 19:55:53,228 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:53,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354819692] [2021-11-25 19:55:53,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354819692] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:53,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658386031] [2021-11-25 19:55:53,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:53,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:53,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:53,244 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:53,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:55:53,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:53,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 19:55:53,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:53,371 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 19:55:53,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:55:53,404 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 16 [2021-11-25 19:55:53,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:55:53,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658386031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:55:53,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324597578] [2021-11-25 19:55:53,425 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 19:55:53,426 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:55:53,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:55:53,426 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:55:53,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:55:53,477 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 6 treesize of output 5 [2021-11-25 19:55:53,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 19:55:53,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:55:53,624 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:55:54,356 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '254#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start_cmemchr_#in~s#1.base| |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~n#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (= |ULTIMATE.start_cmemchr_#t~post3#1.base| |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cmemchr_#t~post3#1.offset| |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (= |ULTIMATE.start_cmemchr_#in~n#1| |ULTIMATE.start_cmemchr_~n#1|) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| |ULTIMATE.start_cmemchr_~s#1.offset|) (= (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1) |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_cmemchr_#in~c#1| |ULTIMATE.start_cmemchr_~c#1|) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~c#1| |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_cmemchr_~s#1.base| |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| |ULTIMATE.start_main_~nondetArea~0#1.offset|) (= |#NULL.base| 0) (= |ULTIMATE.start_cmemchr_~s#1.base| |ULTIMATE.start_cmemchr_#t~post3#1.base|))' at error location [2021-11-25 19:55:54,357 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:55:54,357 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:55:54,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 8 [2021-11-25 19:55:54,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861156970] [2021-11-25 19:55:54,357 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:55:54,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:55:54,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:54,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:55:54,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:55:54,359 INFO L87 Difference]: Start difference. First operand 14 states and 17 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 19:55:54,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:54,492 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2021-11-25 19:55:54,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:55:54,493 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 7 [2021-11-25 19:55:54,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:54,493 INFO L225 Difference]: With dead ends: 17 [2021-11-25 19:55:54,493 INFO L226 Difference]: Without dead ends: 17 [2021-11-25 19:55:54,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:55:54,494 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 61 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:54,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 33 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:55:54,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-25 19:55:54,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-11-25 19:55:54,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:54,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-25 19:55:54,498 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 7 [2021-11-25 19:55:54,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:54,498 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-25 19:55:54,499 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 19:55:54,499 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-25 19:55:54,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:55:54,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:54,500 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:55:54,535 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-25 19:55:54,711 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:54,711 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:55:54,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:54,711 INFO L85 PathProgramCache]: Analyzing trace with hash 1191320785, now seen corresponding path program 1 times [2021-11-25 19:55:54,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:54,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028812915] [2021-11-25 19:55:54,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:54,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:54,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:54,800 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 19:55:54,800 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:54,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2028812915] [2021-11-25 19:55:54,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2028812915] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:54,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [664765883] [2021-11-25 19:55:54,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:54,801 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:54,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:54,802 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:54,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:55:54,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:54,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:55:54,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:54,924 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 19:55:54,924 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:55:54,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [664765883] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:54,924 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:55:54,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 7 [2021-11-25 19:55:54,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785329963] [2021-11-25 19:55:54,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:54,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:55:54,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:54,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:55:54,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:55:54,926 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:54,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:54,931 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2021-11-25 19:55:54,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:55:54,931 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 19:55:54,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:54,932 INFO L225 Difference]: With dead ends: 19 [2021-11-25 19:55:54,932 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 19:55:54,932 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:55:54,935 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 2 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:54,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 25 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 9 Unchecked, 0.0s Time] [2021-11-25 19:55:54,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 19:55:54,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-25 19:55:54,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:54,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-25 19:55:54,940 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 8 [2021-11-25 19:55:54,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:54,940 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-25 19:55:54,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:54,940 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-25 19:55:54,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:55:54,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:54,941 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:55:54,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:55:55,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:55,155 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:55:55,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:55,155 INFO L85 PathProgramCache]: Analyzing trace with hash 1689854200, now seen corresponding path program 1 times [2021-11-25 19:55:55,155 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:55,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795516313] [2021-11-25 19:55:55,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:55,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:55,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:55,223 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 19:55:55,224 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:55,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795516313] [2021-11-25 19:55:55,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795516313] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:55,224 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:55:55,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:55:55,225 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664875758] [2021-11-25 19:55:55,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:55,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:55:55,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:55,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:55:55,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:55:55,226 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 19:55:55,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:55,247 INFO L93 Difference]: Finished difference Result 15 states and 17 transitions. [2021-11-25 19:55:55,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:55:55,248 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 19:55:55,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:55,249 INFO L225 Difference]: With dead ends: 15 [2021-11-25 19:55:55,249 INFO L226 Difference]: Without dead ends: 12 [2021-11-25 19:55:55,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:55:55,250 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 5 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:55,251 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 16 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:55:55,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-25 19:55:55,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-25 19:55:55,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:55,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-25 19:55:55,254 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10 [2021-11-25 19:55:55,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:55,255 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-25 19:55:55,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 19:55:55,255 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-25 19:55:55,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:55:55,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:55,255 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:55:55,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 19:55:55,255 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:55:55,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:55,256 INFO L85 PathProgramCache]: Analyzing trace with hash 846637802, now seen corresponding path program 1 times [2021-11-25 19:55:55,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:55,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266590508] [2021-11-25 19:55:55,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:55,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:55,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:55,381 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:55:55,382 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:55,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266590508] [2021-11-25 19:55:55,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266590508] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:55,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1542169440] [2021-11-25 19:55:55,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:55,382 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:55,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:55,387 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:55,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:55:55,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:55,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:55:55,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:55,545 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:55:55,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:55:55,667 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:55:55,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1542169440] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:55:55,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [980263747] [2021-11-25 19:55:55,675 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:55:55,675 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:55:55,676 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:55:55,676 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:55:55,676 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:55:55,728 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 6 treesize of output 5 [2021-11-25 19:55:55,764 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 19:55:55,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:55:56,401 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:55:57,772 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '471#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:55:57,773 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:55:57,773 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:55:57,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-25 19:55:57,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089278887] [2021-11-25 19:55:57,773 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:55:57,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:55:57,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:57,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:55:57,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:55:57,775 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:57,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:57,855 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-11-25 19:55:57,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:55:57,855 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 19:55:57,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:57,856 INFO L225 Difference]: With dead ends: 20 [2021-11-25 19:55:57,856 INFO L226 Difference]: Without dead ends: 15 [2021-11-25 19:55:57,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-11-25 19:55:57,857 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 12 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:57,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 32 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:55:57,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-25 19:55:57,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-11-25 19:55:57,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:57,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-11-25 19:55:57,860 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-11-25 19:55:57,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:57,860 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-11-25 19:55:57,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:57,861 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-11-25 19:55:57,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 19:55:57,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:57,861 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:55:57,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:55:58,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:58,075 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:55:58,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:58,075 INFO L85 PathProgramCache]: Analyzing trace with hash 1973139321, now seen corresponding path program 2 times [2021-11-25 19:55:58,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:58,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517624826] [2021-11-25 19:55:58,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:58,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:58,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:58,257 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:55:58,258 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:58,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517624826] [2021-11-25 19:55:58,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517624826] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:58,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985148074] [2021-11-25 19:55:58,258 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:55:58,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:58,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:58,260 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:58,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:55:58,339 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 19:55:58,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:55:58,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-25 19:55:58,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:58,642 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:55:58,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:55:58,978 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 19:55:59,074 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:55:59,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985148074] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:55:59,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [35630322] [2021-11-25 19:55:59,076 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:55:59,076 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:55:59,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:55:59,077 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:55:59,077 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:55:59,111 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 6 treesize of output 5 [2021-11-25 19:55:59,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 19:55:59,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:55:59,718 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:01,202 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '619#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:01,202 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:01,202 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:01,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10] total 28 [2021-11-25 19:56:01,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835778471] [2021-11-25 19:56:01,202 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:01,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-25 19:56:01,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:01,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-25 19:56:01,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1235, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 19:56:01,205 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 30 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:01,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:01,807 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-11-25 19:56:01,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 19:56:01,808 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-25 19:56:01,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:01,808 INFO L225 Difference]: With dead ends: 19 [2021-11-25 19:56:01,809 INFO L226 Difference]: Without dead ends: 19 [2021-11-25 19:56:01,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=362, Invalid=1990, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 19:56:01,811 INFO L933 BasicCegarLoop]: 0 mSDtfsCounter, 94 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:01,811 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 1 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:56:01,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-25 19:56:01,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-11-25 19:56:01,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:01,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-11-25 19:56:01,815 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2021-11-25 19:56:01,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:01,815 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-11-25 19:56:01,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:01,815 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-11-25 19:56:01,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 19:56:01,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:01,832 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-11-25 19:56:01,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:02,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:02,047 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:02,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:02,047 INFO L85 PathProgramCache]: Analyzing trace with hash 1234612777, now seen corresponding path program 3 times [2021-11-25 19:56:02,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:02,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949435089] [2021-11-25 19:56:02,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:02,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:02,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:02,185 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:02,185 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:02,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949435089] [2021-11-25 19:56:02,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949435089] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:02,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333646693] [2021-11-25 19:56:02,185 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:56:02,185 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:02,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:02,186 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:02,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:56:02,332 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:56:02,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:56:02,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 19:56:02,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:02,366 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:02,435 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 19:56:02,509 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:02,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:02,699 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:02,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333646693] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:02,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1129557966] [2021-11-25 19:56:02,701 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:02,701 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:02,701 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:02,701 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:02,701 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:02,740 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 6 treesize of output 5 [2021-11-25 19:56:02,767 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 11 treesize of output 7 [2021-11-25 19:56:02,811 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 14 treesize of output 10 [2021-11-25 19:56:03,332 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:04,606 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '800#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:04,606 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:04,606 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:04,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 17 [2021-11-25 19:56:04,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483103217] [2021-11-25 19:56:04,607 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:04,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-25 19:56:04,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:04,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-25 19:56:04,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2021-11-25 19:56:04,609 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:04,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:04,814 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2021-11-25 19:56:04,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 19:56:04,815 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-25 19:56:04,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:04,815 INFO L225 Difference]: With dead ends: 30 [2021-11-25 19:56:04,815 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 19:56:04,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2021-11-25 19:56:04,817 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 22 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:04,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 47 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:56:04,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 19:56:04,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-11-25 19:56:04,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:04,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-25 19:56:04,820 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-11-25 19:56:04,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:04,820 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-25 19:56:04,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:04,821 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-25 19:56:04,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 19:56:04,821 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:04,822 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-11-25 19:56:04,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:05,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:05,035 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:05,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:05,035 INFO L85 PathProgramCache]: Analyzing trace with hash 878565240, now seen corresponding path program 4 times [2021-11-25 19:56:05,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:05,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486841189] [2021-11-25 19:56:05,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:05,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:05,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:05,236 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:05,236 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:05,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486841189] [2021-11-25 19:56:05,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486841189] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:05,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1464009637] [2021-11-25 19:56:05,237 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:56:05,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:05,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:05,238 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:05,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:56:05,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:05,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 19:56:05,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:05,457 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:05,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:05,652 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 19:56:05,670 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:05,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1464009637] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:05,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [183496784] [2021-11-25 19:56:05,672 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:05,672 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:05,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:05,673 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:05,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:05,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:05,737 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 11 treesize of output 7 [2021-11-25 19:56:05,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:06,253 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:07,503 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1000#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:07,503 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:07,503 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:07,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 22 [2021-11-25 19:56:07,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390036731] [2021-11-25 19:56:07,504 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:07,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 19:56:07,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:07,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 19:56:07,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=888, Unknown=0, NotChecked=0, Total=992 [2021-11-25 19:56:07,506 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 24 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 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 19:56:07,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:07,888 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-11-25 19:56:07,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:56:07,889 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 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 19 [2021-11-25 19:56:07,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:07,889 INFO L225 Difference]: With dead ends: 25 [2021-11-25 19:56:07,889 INFO L226 Difference]: Without dead ends: 25 [2021-11-25 19:56:07,890 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=302, Invalid=1590, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 19:56:07,890 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 109 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:07,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 16 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:56:07,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-25 19:56:07,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-11-25 19:56:07,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:07,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-11-25 19:56:07,894 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2021-11-25 19:56:07,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:07,894 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-11-25 19:56:07,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 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 19:56:07,895 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-11-25 19:56:07,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 19:56:07,895 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:07,896 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2021-11-25 19:56:07,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:08,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 19:56:08,115 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:08,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:08,115 INFO L85 PathProgramCache]: Analyzing trace with hash -1707427160, now seen corresponding path program 5 times [2021-11-25 19:56:08,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:08,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086164981] [2021-11-25 19:56:08,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:08,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:08,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:08,291 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:08,291 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:08,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086164981] [2021-11-25 19:56:08,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086164981] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:08,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852782612] [2021-11-25 19:56:08,292 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:56:08,292 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:08,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:08,293 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:08,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:56:08,537 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 19:56:08,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:56:08,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:56:08,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:08,688 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:08,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:08,950 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:08,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852782612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:08,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1999315939] [2021-11-25 19:56:08,952 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:08,952 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:08,952 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:08,953 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:08,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:08,972 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 6 treesize of output 5 [2021-11-25 19:56:09,010 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 11 treesize of output 7 [2021-11-25 19:56:09,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:09,536 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:10,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1235#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:10,841 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:10,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:10,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2021-11-25 19:56:10,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690313936] [2021-11-25 19:56:10,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:10,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 19:56:10,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:10,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 19:56:10,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=783, Unknown=0, NotChecked=0, Total=870 [2021-11-25 19:56:10,843 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:11,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:11,096 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2021-11-25 19:56:11,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 19:56:11,096 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-25 19:56:11,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:11,097 INFO L225 Difference]: With dead ends: 40 [2021-11-25 19:56:11,097 INFO L226 Difference]: Without dead ends: 27 [2021-11-25 19:56:11,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=126, Invalid=1134, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 19:56:11,098 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 33 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:11,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 120 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:56:11,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-25 19:56:11,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-11-25 19:56:11,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:11,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-11-25 19:56:11,101 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 23 [2021-11-25 19:56:11,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:11,101 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-11-25 19:56:11,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:11,102 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-11-25 19:56:11,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 19:56:11,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:11,102 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1] [2021-11-25 19:56:11,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:11,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 19:56:11,319 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:11,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:11,319 INFO L85 PathProgramCache]: Analyzing trace with hash -1386321737, now seen corresponding path program 6 times [2021-11-25 19:56:11,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:11,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683423076] [2021-11-25 19:56:11,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:11,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:11,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:11,535 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:11,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:11,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683423076] [2021-11-25 19:56:11,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683423076] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:11,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856760625] [2021-11-25 19:56:11,536 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:56:11,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:11,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:11,537 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:11,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:56:11,624 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:56:11,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:56:11,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 19:56:11,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:11,654 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:12,073 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 9 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:12,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:12,555 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 16 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:12,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856760625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:12,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1169291811] [2021-11-25 19:56:12,558 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:12,558 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:12,558 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:12,558 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:12,558 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:12,589 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 6 treesize of output 5 [2021-11-25 19:56:12,618 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 11 treesize of output 7 [2021-11-25 19:56:12,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:13,118 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:14,493 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1503#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:14,494 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:14,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:14,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 36 [2021-11-25 19:56:14,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918082313] [2021-11-25 19:56:14,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:14,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 19:56:14,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:14,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 19:56:14,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1887, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 19:56:14,497 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 38 states, 37 states have (on average 2.027027027027027) internal successors, (75), 37 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:15,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:15,282 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2021-11-25 19:56:15,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 19:56:15,283 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 2.027027027027027) internal successors, (75), 37 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-25 19:56:15,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:15,283 INFO L225 Difference]: With dead ends: 31 [2021-11-25 19:56:15,283 INFO L226 Difference]: Without dead ends: 31 [2021-11-25 19:56:15,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 763 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=547, Invalid=3113, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 19:56:15,286 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 169 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:15,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 29 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:56:15,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-25 19:56:15,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-11-25 19:56:15,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:15,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-11-25 19:56:15,290 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 25 [2021-11-25 19:56:15,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:15,290 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-11-25 19:56:15,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 2.027027027027027) internal successors, (75), 37 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:15,291 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-11-25 19:56:15,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 19:56:15,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:15,292 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2021-11-25 19:56:15,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:15,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 19:56:15,513 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:15,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:15,513 INFO L85 PathProgramCache]: Analyzing trace with hash -1845324697, now seen corresponding path program 7 times [2021-11-25 19:56:15,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:15,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107270073] [2021-11-25 19:56:15,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:15,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:15,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:15,749 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:15,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:15,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107270073] [2021-11-25 19:56:15,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107270073] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:15,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946678306] [2021-11-25 19:56:15,750 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:56:15,750 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:15,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:15,751 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:15,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:56:15,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:15,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 19:56:15,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:16,162 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:16,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:16,552 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:16,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1946678306] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:16,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1316603910] [2021-11-25 19:56:16,555 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:16,555 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:16,555 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:16,555 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:16,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:16,572 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 6 treesize of output 5 [2021-11-25 19:56:16,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 19:56:16,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:17,101 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:18,385 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1796#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:18,385 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:18,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:18,386 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2021-11-25 19:56:18,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748794043] [2021-11-25 19:56:18,386 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:18,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 19:56:18,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:18,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 19:56:18,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 19:56:18,388 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:18,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:18,725 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2021-11-25 19:56:18,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 19:56:18,726 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-25 19:56:18,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:18,726 INFO L225 Difference]: With dead ends: 50 [2021-11-25 19:56:18,726 INFO L226 Difference]: Without dead ends: 33 [2021-11-25 19:56:18,727 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=148, Invalid=1574, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 19:56:18,728 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 28 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:18,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 234 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:56:18,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-25 19:56:18,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-11-25 19:56:18,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:18,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-11-25 19:56:18,732 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 29 [2021-11-25 19:56:18,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:18,733 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-11-25 19:56:18,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:18,733 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-11-25 19:56:18,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 19:56:18,734 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:18,734 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1] [2021-11-25 19:56:18,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:18,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:18,935 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:18,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:18,935 INFO L85 PathProgramCache]: Analyzing trace with hash 346635062, now seen corresponding path program 8 times [2021-11-25 19:56:18,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:18,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080227670] [2021-11-25 19:56:18,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:18,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:18,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:19,175 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:19,175 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:19,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080227670] [2021-11-25 19:56:19,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080227670] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:19,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496355176] [2021-11-25 19:56:19,176 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:56:19,176 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:19,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:19,183 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:19,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 19:56:19,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 19:56:19,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:56:19,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-25 19:56:19,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:19,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:19,941 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:56:19,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:20,916 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:56:20,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1496355176] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:20,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [371882313] [2021-11-25 19:56:20,919 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:20,919 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:20,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:20,919 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:20,919 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:20,937 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 6 treesize of output 5 [2021-11-25 19:56:20,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:56:21,003 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 14 treesize of output 10 [2021-11-25 19:56:21,446 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:22,959 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2126#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:22,959 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:22,960 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:22,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 42 [2021-11-25 19:56:22,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164975784] [2021-11-25 19:56:22,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:22,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 19:56:22,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:22,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 19:56:22,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=2433, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 19:56:22,962 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 44 states, 43 states have (on average 1.7906976744186047) internal successors, (77), 43 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 19:56:25,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:25,239 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2021-11-25 19:56:25,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 19:56:25,239 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.7906976744186047) internal successors, (77), 43 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 31 [2021-11-25 19:56:25,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:25,239 INFO L225 Difference]: With dead ends: 52 [2021-11-25 19:56:25,240 INFO L226 Difference]: Without dead ends: 52 [2021-11-25 19:56:25,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1061 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1020, Invalid=5952, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 19:56:25,243 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 182 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 608 mSolverCounterSat, 220 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 828 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 220 IncrementalHoareTripleChecker+Valid, 608 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:25,243 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 46 Invalid, 828 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [220 Valid, 608 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:56:25,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-25 19:56:25,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-11-25 19:56:25,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:25,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2021-11-25 19:56:25,247 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 31 [2021-11-25 19:56:25,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:25,248 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2021-11-25 19:56:25,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 1.7906976744186047) internal successors, (77), 43 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 19:56:25,248 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2021-11-25 19:56:25,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 19:56:25,249 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:25,250 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 5, 5, 1, 1, 1, 1] [2021-11-25 19:56:25,270 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-25 19:56:25,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 19:56:25,455 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:25,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:25,455 INFO L85 PathProgramCache]: Analyzing trace with hash 380989478, now seen corresponding path program 9 times [2021-11-25 19:56:25,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:25,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356265343] [2021-11-25 19:56:25,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:25,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:25,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:25,682 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 124 proven. 39 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 19:56:25,682 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:25,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356265343] [2021-11-25 19:56:25,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [356265343] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:25,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515664181] [2021-11-25 19:56:25,683 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:56:25,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:25,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:25,686 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:25,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 19:56:25,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:56:25,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:56:25,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-25 19:56:25,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:25,805 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:26,251 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 129 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 19:56:26,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:26,558 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 128 proven. 35 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 19:56:26,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [515664181] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:26,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1996733717] [2021-11-25 19:56:26,560 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:26,561 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:26,561 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:26,561 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:26,561 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:26,587 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 6 treesize of output 5 [2021-11-25 19:56:26,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 19:56:26,641 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 19:56:27,071 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:28,270 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2641#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:28,270 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:28,270 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:28,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 38 [2021-11-25 19:56:28,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758415653] [2021-11-25 19:56:28,271 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:28,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-25 19:56:28,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:28,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-25 19:56:28,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=1895, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 19:56:28,273 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 39 states, 39 states have (on average 2.282051282051282) internal successors, (89), 38 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:28,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:28,892 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2021-11-25 19:56:28,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 19:56:28,893 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.282051282051282) internal successors, (89), 38 states have internal predecessors, (89), 0 states have call successors, (0), 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 19:56:28,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:28,895 INFO L225 Difference]: With dead ends: 78 [2021-11-25 19:56:28,895 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 19:56:28,896 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 940 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=578, Invalid=2962, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 19:56:28,897 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 44 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:28,897 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 69 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:56:28,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 19:56:28,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-11-25 19:56:28,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:28,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-11-25 19:56:28,902 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 51 [2021-11-25 19:56:28,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:28,902 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-11-25 19:56:28,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.282051282051282) internal successors, (89), 38 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:28,903 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-11-25 19:56:28,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-25 19:56:28,904 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:28,904 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 6, 6, 1, 1, 1, 1] [2021-11-25 19:56:28,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:29,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 19:56:29,131 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:29,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:29,131 INFO L85 PathProgramCache]: Analyzing trace with hash -1604943435, now seen corresponding path program 10 times [2021-11-25 19:56:29,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:29,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694195945] [2021-11-25 19:56:29,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:29,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:29,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:29,367 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 144 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:56:29,367 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:29,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694195945] [2021-11-25 19:56:29,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [694195945] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:29,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925925974] [2021-11-25 19:56:29,368 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:56:29,368 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:29,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:29,369 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:29,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 19:56:29,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:29,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-25 19:56:29,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:29,464 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:30,021 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 139 proven. 47 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:56:30,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:30,364 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 138 proven. 48 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:56:30,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925925974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:30,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1035256732] [2021-11-25 19:56:30,366 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:30,366 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:30,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:30,366 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:30,366 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:30,392 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 6 treesize of output 5 [2021-11-25 19:56:30,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:30,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:30,908 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:32,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3162#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:32,307 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:32,308 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:32,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 42 [2021-11-25 19:56:32,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51152364] [2021-11-25 19:56:32,308 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:32,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 19:56:32,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:32,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 19:56:32,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=2251, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 19:56:32,311 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 43 states, 43 states have (on average 2.395348837209302) internal successors, (103), 42 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 19:56:33,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:33,353 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2021-11-25 19:56:33,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 19:56:33,353 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.395348837209302) internal successors, (103), 42 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 53 [2021-11-25 19:56:33,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:33,354 INFO L225 Difference]: With dead ends: 84 [2021-11-25 19:56:33,354 INFO L226 Difference]: Without dead ends: 57 [2021-11-25 19:56:33,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1387 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=869, Invalid=4387, Unknown=0, NotChecked=0, Total=5256 [2021-11-25 19:56:33,356 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 48 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:33,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 94 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:56:33,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-25 19:56:33,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-11-25 19:56:33,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 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 19:56:33,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-11-25 19:56:33,361 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 53 [2021-11-25 19:56:33,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:33,362 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-11-25 19:56:33,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.395348837209302) internal successors, (103), 42 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 19:56:33,362 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-11-25 19:56:33,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 19:56:33,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:33,363 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 7, 7, 1, 1, 1, 1] [2021-11-25 19:56:33,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:33,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 19:56:33,567 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:33,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:33,567 INFO L85 PathProgramCache]: Analyzing trace with hash 1173973892, now seen corresponding path program 11 times [2021-11-25 19:56:33,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:33,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112389965] [2021-11-25 19:56:33,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:33,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:33,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:33,945 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 138 proven. 69 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:56:33,945 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:33,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112389965] [2021-11-25 19:56:33,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112389965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:33,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076798178] [2021-11-25 19:56:33,945 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:56:33,945 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:33,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:33,946 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:33,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 19:56:34,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-25 19:56:34,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:56:34,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-25 19:56:34,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:34,534 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:35,235 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 154 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:35,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:35,740 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 154 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:35,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076798178] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:35,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1421712933] [2021-11-25 19:56:35,742 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:35,742 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:35,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:35,742 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:35,743 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:35,776 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 6 treesize of output 5 [2021-11-25 19:56:35,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:35,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:36,255 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:37,566 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3729#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:37,566 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:37,566 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:37,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 50 [2021-11-25 19:56:37,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290277784] [2021-11-25 19:56:37,566 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:37,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-25 19:56:37,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:37,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-25 19:56:37,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=2955, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 19:56:37,570 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:38,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:38,462 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2021-11-25 19:56:38,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-25 19:56:38,462 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-25 19:56:38,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:38,463 INFO L225 Difference]: With dead ends: 126 [2021-11-25 19:56:38,463 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 19:56:38,465 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1722 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1076, Invalid=5404, Unknown=0, NotChecked=0, Total=6480 [2021-11-25 19:56:38,465 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 59 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:38,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 132 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:56:38,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 19:56:38,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-25 19:56:38,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 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 19:56:38,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-11-25 19:56:38,470 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2021-11-25 19:56:38,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:38,470 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-11-25 19:56:38,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:38,471 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-11-25 19:56:38,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 19:56:38,471 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:38,472 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 1, 1, 1, 1] [2021-11-25 19:56:38,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:38,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 19:56:38,675 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:38,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:38,675 INFO L85 PathProgramCache]: Analyzing trace with hash -235632670, now seen corresponding path program 12 times [2021-11-25 19:56:38,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:38,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522890290] [2021-11-25 19:56:38,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:38,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:38,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:39,060 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:39,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:39,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522890290] [2021-11-25 19:56:39,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522890290] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:39,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106914909] [2021-11-25 19:56:39,061 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:56:39,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:39,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:39,062 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:39,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 19:56:39,223 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:56:39,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:56:39,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-25 19:56:39,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:39,240 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:39,561 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 19:56:39,725 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:39,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:40,609 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:40,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106914909] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:40,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [845088752] [2021-11-25 19:56:40,611 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:40,611 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:40,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:40,611 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:40,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:40,631 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 6 treesize of output 5 [2021-11-25 19:56:40,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 19:56:40,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:41,031 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:42,556 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4368#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:42,557 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:42,557 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:42,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 52 [2021-11-25 19:56:42,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915544426] [2021-11-25 19:56:42,557 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:42,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 19:56:42,558 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:42,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 19:56:42,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=3497, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 19:56:42,559 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 53 states, 53 states have (on average 2.5849056603773586) internal successors, (137), 52 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:44,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:44,489 INFO L93 Difference]: Finished difference Result 100 states and 101 transitions. [2021-11-25 19:56:44,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 19:56:44,489 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.5849056603773586) internal successors, (137), 52 states have internal predecessors, (137), 0 states have call successors, (0), 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 19:56:44,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:44,490 INFO L225 Difference]: With dead ends: 100 [2021-11-25 19:56:44,490 INFO L226 Difference]: Without dead ends: 63 [2021-11-25 19:56:44,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1200 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=370, Invalid=5950, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 19:56:44,493 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 303 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 1321 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 1440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 1321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:44,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 514 Invalid, 1440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 1321 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:56:44,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-25 19:56:44,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-11-25 19:56:44,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:44,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-11-25 19:56:44,497 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 59 [2021-11-25 19:56:44,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:44,498 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-11-25 19:56:44,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.5849056603773586) internal successors, (137), 52 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:44,498 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-11-25 19:56:44,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 19:56:44,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:44,499 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 1, 1, 1, 1] [2021-11-25 19:56:44,527 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-25 19:56:44,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:44,715 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:44,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:44,715 INFO L85 PathProgramCache]: Analyzing trace with hash -1473340815, now seen corresponding path program 13 times [2021-11-25 19:56:44,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:44,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302906285] [2021-11-25 19:56:44,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:44,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:44,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:45,234 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 64 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:45,234 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:45,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302906285] [2021-11-25 19:56:45,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302906285] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:45,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708941755] [2021-11-25 19:56:45,235 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:56:45,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:45,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:45,243 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:45,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 19:56:45,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:45,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-25 19:56:45,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:45,807 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 90 proven. 172 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:45,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:46,377 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 19:56:46,428 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 90 proven. 172 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:46,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708941755] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:46,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1718778871] [2021-11-25 19:56:46,430 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:46,430 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:46,430 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:46,431 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:46,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:46,460 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 6 treesize of output 5 [2021-11-25 19:56:46,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 19:56:46,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:46,912 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:48,211 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4990#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:48,211 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:48,211 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:48,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 52 [2021-11-25 19:56:48,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168962476] [2021-11-25 19:56:48,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:48,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-25 19:56:48,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:48,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-25 19:56:48,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=3422, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 19:56:48,213 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 54 states, 53 states have (on average 2.3962264150943398) internal successors, (127), 53 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:49,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:49,288 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2021-11-25 19:56:49,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 19:56:49,289 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 2.3962264150943398) internal successors, (127), 53 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-25 19:56:49,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:49,289 INFO L225 Difference]: With dead ends: 67 [2021-11-25 19:56:49,290 INFO L226 Difference]: Without dead ends: 67 [2021-11-25 19:56:49,291 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1177, Invalid=5963, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 19:56:49,291 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 336 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 947 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 1054 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 947 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:49,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [336 Valid, 135 Invalid, 1054 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 947 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:56:49,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-25 19:56:49,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2021-11-25 19:56:49,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:49,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-11-25 19:56:49,295 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2021-11-25 19:56:49,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:49,296 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-11-25 19:56:49,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 2.3962264150943398) internal successors, (127), 53 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:49,296 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-11-25 19:56:49,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 19:56:49,297 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:49,297 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 1, 1, 1, 1] [2021-11-25 19:56:49,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:49,502 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:49,503 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:49,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:49,503 INFO L85 PathProgramCache]: Analyzing trace with hash 1636784417, now seen corresponding path program 14 times [2021-11-25 19:56:49,503 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:49,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218158635] [2021-11-25 19:56:49,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:49,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:49,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:49,985 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:49,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:49,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218158635] [2021-11-25 19:56:49,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218158635] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:49,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [263765098] [2021-11-25 19:56:49,986 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:56:49,986 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:49,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:49,991 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:50,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 19:56:51,078 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-25 19:56:51,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:56:51,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-25 19:56:51,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:51,104 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:51,474 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 19:56:51,652 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:51,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:52,697 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:52,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [263765098] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:52,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1671811776] [2021-11-25 19:56:52,698 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:56:52,698 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:56:52,699 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:56:52,699 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:56:52,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:56:52,718 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 6 treesize of output 5 [2021-11-25 19:56:52,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:52,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:56:53,182 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:56:54,719 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5619#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:56:54,720 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:56:54,720 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:56:54,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 57 [2021-11-25 19:56:54,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467507175] [2021-11-25 19:56:54,720 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:54,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-25 19:56:54,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:56:54,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-25 19:56:54,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=4114, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 19:56:54,721 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 58 states, 58 states have (on average 2.603448275862069) internal successors, (151), 57 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 19:56:56,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:56,968 INFO L93 Difference]: Finished difference Result 110 states and 111 transitions. [2021-11-25 19:56:56,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 19:56:56,968 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.603448275862069) internal successors, (151), 57 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 65 [2021-11-25 19:56:56,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:56,969 INFO L225 Difference]: With dead ends: 110 [2021-11-25 19:56:56,969 INFO L226 Difference]: Without dead ends: 69 [2021-11-25 19:56:56,969 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1412 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=415, Invalid=7067, Unknown=0, NotChecked=0, Total=7482 [2021-11-25 19:56:56,970 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 334 mSDsluCounter, 597 mSDsCounter, 0 mSdLazyCounter, 1550 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 588 SdHoareTripleChecker+Invalid, 1681 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 1550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:56,970 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [334 Valid, 588 Invalid, 1681 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 1550 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 19:56:56,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-25 19:56:56,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-11-25 19:56:56,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 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 19:56:56,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2021-11-25 19:56:56,974 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 65 [2021-11-25 19:56:56,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:56,974 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2021-11-25 19:56:56,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.603448275862069) internal successors, (151), 57 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 19:56:56,975 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2021-11-25 19:56:56,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 19:56:56,976 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:56,976 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 1, 1, 1, 1] [2021-11-25 19:56:56,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:57,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-25 19:56:57,180 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:56:57,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:57,181 INFO L85 PathProgramCache]: Analyzing trace with hash -1055980432, now seen corresponding path program 15 times [2021-11-25 19:56:57,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:56:57,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829821439] [2021-11-25 19:56:57,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:57,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:56:57,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:57,624 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 81 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:57,624 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:56:57,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829821439] [2021-11-25 19:56:57,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829821439] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:57,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691365169] [2021-11-25 19:56:57,624 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:56:57,625 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:57,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:57,625 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:57,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 19:56:57,789 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:56:57,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:56:57,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-25 19:56:57,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:57,802 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:58,870 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 100 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:58,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:00,251 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 121 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:00,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691365169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:00,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1399287361] [2021-11-25 19:57:00,253 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:57:00,253 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:57:00,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:57:00,254 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:57:00,254 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:57:00,284 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 6 treesize of output 5 [2021-11-25 19:57:00,310 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 11 treesize of output 7 [2021-11-25 19:57:00,340 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 14 treesize of output 10 [2021-11-25 19:57:00,674 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:57:02,325 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6321#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:57:02,326 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:57:02,326 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:57:02,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 76 [2021-11-25 19:57:02,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371528918] [2021-11-25 19:57:02,326 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:02,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-25 19:57:02,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:57:02,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-25 19:57:02,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=6680, Unknown=0, NotChecked=0, Total=7310 [2021-11-25 19:57:02,329 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 78 states, 77 states have (on average 2.6103896103896105) internal successors, (201), 77 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:03,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:03,646 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2021-11-25 19:57:03,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 19:57:03,648 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 77 states have (on average 2.6103896103896105) internal successors, (201), 77 states have internal predecessors, (201), 0 states have call successors, (0), 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 19:57:03,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:03,648 INFO L225 Difference]: With dead ends: 73 [2021-11-25 19:57:03,648 INFO L226 Difference]: Without dead ends: 73 [2021-11-25 19:57:03,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3024 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1878, Invalid=10554, Unknown=0, NotChecked=0, Total=12432 [2021-11-25 19:57:03,650 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 558 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 1318 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 558 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 1489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 1318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:03,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [558 Valid, 189 Invalid, 1489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 1318 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:57:03,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-25 19:57:03,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2021-11-25 19:57:03,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:03,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-11-25 19:57:03,654 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 67 [2021-11-25 19:57:03,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:03,655 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-11-25 19:57:03,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 77 states have (on average 2.6103896103896105) internal successors, (201), 77 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:03,655 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-11-25 19:57:03,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 19:57:03,656 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:03,656 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 1, 1, 1, 1] [2021-11-25 19:57:03,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:03,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-25 19:57:03,867 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:57:03,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:03,867 INFO L85 PathProgramCache]: Analyzing trace with hash -534991968, now seen corresponding path program 16 times [2021-11-25 19:57:03,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:57:03,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041443913] [2021-11-25 19:57:03,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:03,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:57:03,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:04,410 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:04,410 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:57:04,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041443913] [2021-11-25 19:57:04,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041443913] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:57:04,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934858212] [2021-11-25 19:57:04,411 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:57:04,411 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:04,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:04,412 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:04,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 19:57:04,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:04,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 19:57:04,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:05,044 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:05,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:06,274 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:06,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934858212] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:06,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [859205626] [2021-11-25 19:57:06,275 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:57:06,275 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:57:06,275 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:57:06,276 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:57:06,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:57:06,287 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 6 treesize of output 5 [2021-11-25 19:57:06,320 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 11 treesize of output 7 [2021-11-25 19:57:06,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:57:06,766 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:57:08,299 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7000#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:57:08,299 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:57:08,299 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:57:08,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 53 [2021-11-25 19:57:08,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86643910] [2021-11-25 19:57:08,299 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:08,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-25 19:57:08,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:57:08,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-25 19:57:08,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3615, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 19:57:08,301 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:09,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:09,768 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2021-11-25 19:57:09,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-25 19:57:09,769 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-25 19:57:09,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:09,769 INFO L225 Difference]: With dead ends: 120 [2021-11-25 19:57:09,769 INFO L226 Difference]: Without dead ends: 75 [2021-11-25 19:57:09,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1056 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=302, Invalid=6670, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 19:57:09,770 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 71 mSDsluCounter, 1117 mSDsCounter, 0 mSdLazyCounter, 1379 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 1126 SdHoareTripleChecker+Invalid, 1414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:09,771 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 1126 Invalid, 1414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1379 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:57:09,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-25 19:57:09,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2021-11-25 19:57:09,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:09,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-11-25 19:57:09,774 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 71 [2021-11-25 19:57:09,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:09,774 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-11-25 19:57:09,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:09,775 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-11-25 19:57:09,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 19:57:09,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:09,776 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 1, 1, 1, 1] [2021-11-25 19:57:09,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:09,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 19:57:09,991 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:57:09,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:09,991 INFO L85 PathProgramCache]: Analyzing trace with hash -2130944081, now seen corresponding path program 17 times [2021-11-25 19:57:09,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:57:09,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427946080] [2021-11-25 19:57:09,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:09,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:57:10,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:10,644 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 100 proven. 286 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:10,644 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:57:10,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427946080] [2021-11-25 19:57:10,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427946080] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:57:10,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221903018] [2021-11-25 19:57:10,645 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:57:10,645 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:10,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:10,647 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:10,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 19:57:11,450 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-25 19:57:11,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:57:11,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 150 conjunts are in the unsatisfiable core [2021-11-25 19:57:11,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:11,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:57:12,877 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 23 proven. 242 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-25 19:57:12,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:16,107 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 0 proven. 296 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-25 19:57:16,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221903018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:16,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1584525069] [2021-11-25 19:57:16,109 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:57:16,109 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:57:16,109 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:57:16,109 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:57:16,109 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:57:16,134 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 6 treesize of output 5 [2021-11-25 19:57:16,155 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 11 treesize of output 7 [2021-11-25 19:57:16,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:57:16,513 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:57:18,507 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7769#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:57:18,507 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:57:18,507 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:57:18,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 30, 32] total 89 [2021-11-25 19:57:18,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493410202] [2021-11-25 19:57:18,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:18,508 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-25 19:57:18,508 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:57:18,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-25 19:57:18,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=740, Invalid=8962, Unknown=0, NotChecked=0, Total=9702 [2021-11-25 19:57:18,510 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 91 states, 90 states have (on average 2.022222222222222) internal successors, (182), 90 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:32,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:32,106 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2021-11-25 19:57:32,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-25 19:57:32,106 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 90 states have (on average 2.022222222222222) internal successors, (182), 90 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-25 19:57:32,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:32,107 INFO L225 Difference]: With dead ends: 122 [2021-11-25 19:57:32,107 INFO L226 Difference]: Without dead ends: 122 [2021-11-25 19:57:32,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5509 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=5115, Invalid=28557, Unknown=0, NotChecked=0, Total=33672 [2021-11-25 19:57:32,109 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 514 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 2099 mSolverCounterSat, 688 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 514 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 2787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 688 IncrementalHoareTripleChecker+Valid, 2099 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:32,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [514 Valid, 299 Invalid, 2787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [688 Valid, 2099 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-25 19:57:32,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-25 19:57:32,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2021-11-25 19:57:32,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:32,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2021-11-25 19:57:32,113 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 73 [2021-11-25 19:57:32,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:32,114 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2021-11-25 19:57:32,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 90 states have (on average 2.022222222222222) internal successors, (182), 90 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:32,114 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2021-11-25 19:57:32,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 19:57:32,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:32,116 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 12, 12, 1, 1, 1, 1] [2021-11-25 19:57:32,122 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-11-25 19:57:32,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-25 19:57:32,319 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:57:32,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:32,319 INFO L85 PathProgramCache]: Analyzing trace with hash 1622600687, now seen corresponding path program 18 times [2021-11-25 19:57:32,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:57:32,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391614083] [2021-11-25 19:57:32,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:32,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:57:32,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:32,914 INFO L134 CoverageAnalysis]: Checked inductivity of 1202 backedges. 826 proven. 156 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-25 19:57:32,914 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:57:32,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391614083] [2021-11-25 19:57:32,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [391614083] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:57:32,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822701711] [2021-11-25 19:57:32,915 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:57:32,915 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:32,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:32,919 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:32,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 19:57:33,186 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:57:33,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:57:33,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-25 19:57:33,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:33,204 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:57:34,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1202 backedges. 815 proven. 167 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-25 19:57:34,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:35,187 INFO L134 CoverageAnalysis]: Checked inductivity of 1202 backedges. 814 proven. 168 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-25 19:57:35,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [822701711] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:35,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [661790847] [2021-11-25 19:57:35,189 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:57:35,189 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:57:35,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:57:35,190 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:57:35,190 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:57:35,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:57:35,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:57:35,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:57:35,635 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:57:37,052 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8984#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:57:37,052 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:57:37,052 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:57:37,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 30, 30] total 72 [2021-11-25 19:57:37,053 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300627258] [2021-11-25 19:57:37,053 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:37,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-25 19:57:37,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:57:37,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-25 19:57:37,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=794, Invalid=5686, Unknown=0, NotChecked=0, Total=6480 [2021-11-25 19:57:37,055 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 73 states, 73 states have (on average 2.5616438356164384) internal successors, (187), 72 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:39,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:39,044 INFO L93 Difference]: Finished difference Result 176 states and 177 transitions. [2021-11-25 19:57:39,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-25 19:57:39,045 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.5616438356164384) internal successors, (187), 72 states have internal predecessors, (187), 0 states have call successors, (0), 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 121 [2021-11-25 19:57:39,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:39,046 INFO L225 Difference]: With dead ends: 176 [2021-11-25 19:57:39,046 INFO L226 Difference]: Without dead ends: 125 [2021-11-25 19:57:39,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 310 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3940 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=2423, Invalid=12097, Unknown=0, NotChecked=0, Total=14520 [2021-11-25 19:57:39,047 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 61 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:39,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 202 Invalid, 706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:57:39,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-25 19:57:39,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-11-25 19:57:39,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.016260162601626) internal successors, (125), 123 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:39,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2021-11-25 19:57:39,052 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 121 [2021-11-25 19:57:39,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:39,052 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2021-11-25 19:57:39,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.5616438356164384) internal successors, (187), 72 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:39,052 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2021-11-25 19:57:39,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-25 19:57:39,054 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:39,054 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 13, 13, 1, 1, 1, 1] [2021-11-25 19:57:39,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:39,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:39,267 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:57:39,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:39,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1310171586, now seen corresponding path program 19 times [2021-11-25 19:57:39,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:57:39,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700521638] [2021-11-25 19:57:39,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:39,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:57:39,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:39,907 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 865 proven. 182 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-25 19:57:39,907 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:57:39,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700521638] [2021-11-25 19:57:39,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700521638] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:57:39,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [858856497] [2021-11-25 19:57:39,908 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:57:39,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:39,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:39,909 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:39,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 19:57:40,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:40,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-25 19:57:40,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:40,107 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:57:41,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 853 proven. 194 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-25 19:57:41,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:42,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 852 proven. 195 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-25 19:57:42,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [858856497] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:42,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [182201400] [2021-11-25 19:57:42,221 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:57:42,221 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:57:42,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:57:42,221 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:57:42,222 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:57:42,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:57:42,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:57:42,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:57:42,644 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:57:44,099 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10182#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:57:44,100 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:57:44,100 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:57:44,100 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 77 [2021-11-25 19:57:44,100 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811084142] [2021-11-25 19:57:44,100 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:44,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-25 19:57:44,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:57:44,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-25 19:57:44,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=6409, Unknown=0, NotChecked=0, Total=7310 [2021-11-25 19:57:44,102 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand has 78 states, 78 states have (on average 2.576923076923077) internal successors, (201), 77 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:46,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:46,276 INFO L93 Difference]: Finished difference Result 182 states and 183 transitions. [2021-11-25 19:57:46,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-25 19:57:46,276 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 2.576923076923077) internal successors, (201), 77 states have internal predecessors, (201), 0 states have call successors, (0), 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 123 [2021-11-25 19:57:46,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:46,277 INFO L225 Difference]: With dead ends: 182 [2021-11-25 19:57:46,277 INFO L226 Difference]: Without dead ends: 127 [2021-11-25 19:57:46,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 313 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4488 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=2759, Invalid=13753, Unknown=0, NotChecked=0, Total=16512 [2021-11-25 19:57:46,278 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 80 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 711 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:46,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 208 Invalid, 732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 711 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:57:46,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-25 19:57:46,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2021-11-25 19:57:46,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.016) internal successors, (127), 125 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:46,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2021-11-25 19:57:46,282 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 123 [2021-11-25 19:57:46,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:46,283 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2021-11-25 19:57:46,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 2.576923076923077) internal successors, (201), 77 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:46,283 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2021-11-25 19:57:46,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 19:57:46,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:46,285 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 14, 14, 1, 1, 1, 1] [2021-11-25 19:57:46,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:46,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-25 19:57:46,511 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:57:46,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:46,511 INFO L85 PathProgramCache]: Analyzing trace with hash 2089187533, now seen corresponding path program 20 times [2021-11-25 19:57:46,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:57:46,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506865640] [2021-11-25 19:57:46,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:46,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:57:46,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:47,196 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 900 proven. 210 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-25 19:57:47,196 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:57:47,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506865640] [2021-11-25 19:57:47,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1506865640] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:57:47,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032519075] [2021-11-25 19:57:47,196 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:57:47,197 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:47,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:47,199 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:47,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 19:57:54,107 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-25 19:57:54,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:57:54,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 146 conjunts are in the unsatisfiable core [2021-11-25 19:57:54,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:54,129 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:57:55,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 903 proven. 231 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-25 19:57:55,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:56,521 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 454 proven. 680 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-25 19:57:56,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2032519075] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:56,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [39809769] [2021-11-25 19:57:56,522 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:57:56,523 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:57:56,523 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:57:56,523 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:57:56,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:57:56,564 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 6 treesize of output 5 [2021-11-25 19:57:56,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 19:57:56,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:57:56,957 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:57:58,439 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11411#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:57:58,439 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:57:58,439 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:57:58,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 34, 34] total 82 [2021-11-25 19:57:58,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413609028] [2021-11-25 19:57:58,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:58,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-25 19:57:58,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:57:58,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-25 19:57:58,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1015, Invalid=7175, Unknown=0, NotChecked=0, Total=8190 [2021-11-25 19:57:58,441 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand has 83 states, 83 states have (on average 2.63855421686747) internal successors, (219), 82 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:00,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:00,833 INFO L93 Difference]: Finished difference Result 188 states and 189 transitions. [2021-11-25 19:58:00,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-25 19:58:00,834 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 2.63855421686747) internal successors, (219), 82 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 125 [2021-11-25 19:58:00,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:00,834 INFO L225 Difference]: With dead ends: 188 [2021-11-25 19:58:00,835 INFO L226 Difference]: Without dead ends: 129 [2021-11-25 19:58:00,835 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 316 SyntacticMatches, 1 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5071 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=3117, Invalid=15515, Unknown=0, NotChecked=0, Total=18632 [2021-11-25 19:58:00,836 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 76 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 747 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 765 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 747 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:00,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 211 Invalid, 765 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 747 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:58:00,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-25 19:58:00,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2021-11-25 19:58:00,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:00,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 129 transitions. [2021-11-25 19:58:00,839 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 129 transitions. Word has length 125 [2021-11-25 19:58:00,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:00,840 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 129 transitions. [2021-11-25 19:58:00,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 2.63855421686747) internal successors, (219), 82 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:00,840 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 129 transitions. [2021-11-25 19:58:00,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 19:58:00,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:00,841 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 15, 15, 1, 1, 1, 1] [2021-11-25 19:58:00,858 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:01,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 19:58:01,048 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:58:01,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:01,048 INFO L85 PathProgramCache]: Analyzing trace with hash 403188636, now seen corresponding path program 21 times [2021-11-25 19:58:01,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:58:01,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632196058] [2021-11-25 19:58:01,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:01,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:58:01,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:01,789 INFO L134 CoverageAnalysis]: Checked inductivity of 1283 backedges. 902 proven. 269 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-25 19:58:01,790 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:58:01,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632196058] [2021-11-25 19:58:01,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [632196058] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:58:01,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929953369] [2021-11-25 19:58:01,790 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:58:01,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:01,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:01,795 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:58:01,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 19:58:02,235 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:58:02,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:58:02,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 722 conjuncts, 126 conjunts are in the unsatisfiable core [2021-11-25 19:58:02,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:02,251 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:58:03,804 INFO L134 CoverageAnalysis]: Checked inductivity of 1283 backedges. 931 proven. 240 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-25 19:58:03,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:04,864 INFO L134 CoverageAnalysis]: Checked inductivity of 1283 backedges. 931 proven. 240 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-25 19:58:04,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929953369] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:04,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1751391539] [2021-11-25 19:58:04,866 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:58:04,866 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:58:04,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:58:04,866 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:58:04,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:58:04,888 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 6 treesize of output 5 [2021-11-25 19:58:04,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:58:04,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:58:05,272 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:58:06,795 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12672#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:58:06,795 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:58:06,795 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:58:06,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 88 [2021-11-25 19:58:06,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694550294] [2021-11-25 19:58:06,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:58:06,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-25 19:58:06,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:58:06,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-25 19:58:06,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1093, Invalid=8219, Unknown=0, NotChecked=0, Total=9312 [2021-11-25 19:58:06,798 INFO L87 Difference]: Start difference. First operand 128 states and 129 transitions. Second operand has 89 states, 89 states have (on average 2.5842696629213484) internal successors, (230), 88 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:09,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:09,303 INFO L93 Difference]: Finished difference Result 194 states and 195 transitions. [2021-11-25 19:58:09,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-25 19:58:09,303 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 2.5842696629213484) internal successors, (230), 88 states have internal predecessors, (230), 0 states have call successors, (0), 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 127 [2021-11-25 19:58:09,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:09,307 INFO L225 Difference]: With dead ends: 194 [2021-11-25 19:58:09,307 INFO L226 Difference]: Without dead ends: 131 [2021-11-25 19:58:09,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 319 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5754 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=3492, Invalid=17678, Unknown=0, NotChecked=0, Total=21170 [2021-11-25 19:58:09,309 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 72 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 751 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 771 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 751 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:09,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 212 Invalid, 771 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 751 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:58:09,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-25 19:58:09,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2021-11-25 19:58:09,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 129 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:09,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2021-11-25 19:58:09,313 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 127 [2021-11-25 19:58:09,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:09,313 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2021-11-25 19:58:09,314 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 2.5842696629213484) internal successors, (230), 88 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:09,314 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2021-11-25 19:58:09,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-25 19:58:09,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:09,315 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 16, 16, 1, 1, 1, 1] [2021-11-25 19:58:09,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:09,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 19:58:09,519 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:58:09,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:09,519 INFO L85 PathProgramCache]: Analyzing trace with hash -639080789, now seen corresponding path program 22 times [2021-11-25 19:58:09,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:58:09,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395161964] [2021-11-25 19:58:09,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:09,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:58:09,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:10,351 INFO L134 CoverageAnalysis]: Checked inductivity of 1314 backedges. 927 proven. 303 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 19:58:10,351 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:58:10,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395161964] [2021-11-25 19:58:10,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395161964] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:58:10,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109579003] [2021-11-25 19:58:10,352 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:58:10,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:10,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:10,353 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:58:10,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 19:58:10,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:10,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 735 conjuncts, 128 conjunts are in the unsatisfiable core [2021-11-25 19:58:10,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:10,574 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:58:12,236 INFO L134 CoverageAnalysis]: Checked inductivity of 1314 backedges. 943 proven. 287 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 19:58:12,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:13,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1314 backedges. 942 proven. 288 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 19:58:13,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109579003] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:13,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1578544748] [2021-11-25 19:58:13,426 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:58:13,426 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:58:13,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:58:13,426 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:58:13,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:58:13,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:58:13,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:58:13,521 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 19:58:13,859 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:58:15,415 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13962#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:58:15,415 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:58:15,415 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:58:15,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 91 [2021-11-25 19:58:15,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130628513] [2021-11-25 19:58:15,416 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:58:15,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-11-25 19:58:15,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:58:15,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-11-25 19:58:15,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1504, Invalid=8396, Unknown=0, NotChecked=0, Total=9900 [2021-11-25 19:58:15,418 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 92 states, 92 states have (on average 2.630434782608696) internal successors, (242), 91 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:17,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:17,063 INFO L93 Difference]: Finished difference Result 200 states and 201 transitions. [2021-11-25 19:58:17,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-25 19:58:17,063 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 2.630434782608696) internal successors, (242), 91 states have internal predecessors, (242), 0 states have call successors, (0), 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 129 [2021-11-25 19:58:17,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:17,064 INFO L225 Difference]: With dead ends: 200 [2021-11-25 19:58:17,064 INFO L226 Difference]: Without dead ends: 133 [2021-11-25 19:58:17,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 459 GetRequests, 324 SyntacticMatches, 1 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4559 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=3473, Invalid=14887, Unknown=0, NotChecked=0, Total=18360 [2021-11-25 19:58:17,066 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 83 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 755 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 773 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 755 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:17,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 242 Invalid, 773 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 755 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:58:17,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-25 19:58:17,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2021-11-25 19:58:17,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.015267175572519) internal successors, (133), 131 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 19:58:17,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2021-11-25 19:58:17,071 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 129 [2021-11-25 19:58:17,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:17,071 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2021-11-25 19:58:17,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 2.630434782608696) internal successors, (242), 91 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:17,071 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2021-11-25 19:58:17,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-25 19:58:17,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:17,072 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 17, 17, 1, 1, 1, 1] [2021-11-25 19:58:17,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:17,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 19:58:17,283 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:58:17,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:17,283 INFO L85 PathProgramCache]: Analyzing trace with hash -1532618246, now seen corresponding path program 23 times [2021-11-25 19:58:17,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:58:17,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295444362] [2021-11-25 19:58:17,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:17,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:58:17,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:18,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1347 backedges. 948 proven. 339 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 19:58:18,014 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:58:18,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295444362] [2021-11-25 19:58:18,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295444362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:58:18,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120436107] [2021-11-25 19:58:18,014 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:58:18,015 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:18,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:18,020 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:58:18,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 19:58:25,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-25 19:58:25,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:58:25,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 748 conjuncts, 170 conjunts are in the unsatisfiable core [2021-11-25 19:58:25,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:25,629 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:58:27,755 INFO L134 CoverageAnalysis]: Checked inductivity of 1347 backedges. 1036 proven. 311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:27,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:29,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1347 backedges. 1036 proven. 311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:29,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2120436107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:29,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1606917234] [2021-11-25 19:58:29,329 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:58:29,329 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:58:29,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:58:29,330 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:58:29,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:58:29,352 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 6 treesize of output 5 [2021-11-25 19:58:29,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:58:29,398 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 19:58:29,725 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:58:31,402 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15263#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:58:31,402 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:58:31,402 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:58:31,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 44, 44] total 108 [2021-11-25 19:58:31,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313908151] [2021-11-25 19:58:31,403 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:58:31,404 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-25 19:58:31,404 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:58:31,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-25 19:58:31,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1855, Invalid=11717, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 19:58:31,406 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand has 109 states, 109 states have (on average 2.7339449541284404) internal successors, (298), 108 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:35,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:35,765 INFO L93 Difference]: Finished difference Result 306 states and 311 transitions. [2021-11-25 19:58:35,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-25 19:58:35,782 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 2.7339449541284404) internal successors, (298), 108 states have internal predecessors, (298), 0 states have call successors, (0), 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 131 [2021-11-25 19:58:35,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:35,783 INFO L225 Difference]: With dead ends: 306 [2021-11-25 19:58:35,783 INFO L226 Difference]: Without dead ends: 144 [2021-11-25 19:58:35,786 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 315 SyntacticMatches, 1 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10814 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=6780, Invalid=31832, Unknown=0, NotChecked=0, Total=38612 [2021-11-25 19:58:35,787 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 126 mSDsluCounter, 764 mSDsCounter, 0 mSdLazyCounter, 1478 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 428 SdHoareTripleChecker+Invalid, 1533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:35,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 428 Invalid, 1533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1478 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:58:35,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-25 19:58:35,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2021-11-25 19:58:35,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:35,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2021-11-25 19:58:35,792 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 131 [2021-11-25 19:58:35,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:35,792 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2021-11-25 19:58:35,792 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 2.7339449541284404) internal successors, (298), 108 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:35,792 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2021-11-25 19:58:35,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:58:35,793 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:35,793 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 1, 1, 1, 1] [2021-11-25 19:58:35,804 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-25 19:58:36,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:36,000 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:58:36,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:36,001 INFO L85 PathProgramCache]: Analyzing trace with hash 1459596052, now seen corresponding path program 24 times [2021-11-25 19:58:36,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:58:36,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915280843] [2021-11-25 19:58:36,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:36,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:58:36,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:37,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1587 backedges. 46 proven. 1541 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:37,441 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:58:37,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915280843] [2021-11-25 19:58:37,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915280843] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:58:37,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19086710] [2021-11-25 19:58:37,441 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:58:37,441 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:37,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:37,442 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:58:37,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 19:58:37,977 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:58:37,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:58:37,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-25 19:58:37,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:38,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1587 backedges. 46 proven. 1541 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:38,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:42,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1587 backedges. 46 proven. 1541 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:42,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19086710] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:42,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [342154078] [2021-11-25 19:58:42,396 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:58:42,396 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:58:42,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:58:42,397 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:58:42,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:58:42,417 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 6 treesize of output 5 [2021-11-25 19:58:42,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:58:42,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:58:42,801 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:58:44,949 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16835#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:58:44,949 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:58:44,949 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:58:44,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 101 [2021-11-25 19:58:44,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044580327] [2021-11-25 19:58:44,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:58:44,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2021-11-25 19:58:44,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:58:44,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-11-25 19:58:44,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=11703, Unknown=0, NotChecked=0, Total=11990 [2021-11-25 19:58:44,951 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand has 102 states, 102 states have (on average 2.823529411764706) internal successors, (288), 101 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:50,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:50,328 INFO L93 Difference]: Finished difference Result 240 states and 241 transitions. [2021-11-25 19:58:50,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-25 19:58:50,328 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 2.823529411764706) internal successors, (288), 101 states have internal predecessors, (288), 0 states have call successors, (0), 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 143 [2021-11-25 19:58:50,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:50,329 INFO L225 Difference]: With dead ends: 240 [2021-11-25 19:58:50,329 INFO L226 Difference]: Without dead ends: 147 [2021-11-25 19:58:50,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 367 SyntacticMatches, 2 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3216 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=566, Invalid=23614, Unknown=0, NotChecked=0, Total=24180 [2021-11-25 19:58:50,330 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 143 mSDsluCounter, 4766 mSDsCounter, 0 mSdLazyCounter, 5180 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 4797 SdHoareTripleChecker+Invalid, 5251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 5180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:50,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 4797 Invalid, 5251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 5180 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:58:50,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-25 19:58:50,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 146. [2021-11-25 19:58:50,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.013793103448276) internal successors, (147), 145 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:50,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2021-11-25 19:58:50,335 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 143 [2021-11-25 19:58:50,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:50,335 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2021-11-25 19:58:50,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 102 states have (on average 2.823529411764706) internal successors, (288), 101 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:50,336 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2021-11-25 19:58:50,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 19:58:50,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:50,337 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 1, 1, 1, 1] [2021-11-25 19:58:50,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:50,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:50,543 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:58:50,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:50,543 INFO L85 PathProgramCache]: Analyzing trace with hash 956164131, now seen corresponding path program 25 times [2021-11-25 19:58:50,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:58:50,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527349001] [2021-11-25 19:58:50,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:50,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:58:50,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:52,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 484 proven. 1150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:52,114 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:58:52,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527349001] [2021-11-25 19:58:52,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [527349001] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:58:52,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379698161] [2021-11-25 19:58:52,114 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:58:52,114 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:52,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:52,115 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:58:52,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 19:58:52,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:52,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 225 conjunts are in the unsatisfiable core [2021-11-25 19:58:52,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:53,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 552 proven. 1082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:53,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:55,416 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 19:58:55,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 552 proven. 1082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:55,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379698161] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:55,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1549247075] [2021-11-25 19:58:55,501 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:58:55,502 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:58:55,502 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:58:55,502 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:58:55,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:58:55,543 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 6 treesize of output 5 [2021-11-25 19:58:55,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:58:55,590 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 19:58:55,943 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:58:57,865 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18294#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:58:57,865 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:58:57,866 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:58:57,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 52, 52] total 107 [2021-11-25 19:58:57,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423542999] [2021-11-25 19:58:57,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:58:57,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-25 19:58:57,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:58:57,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-25 19:58:57,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1397, Invalid=12175, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 19:58:57,869 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand has 109 states, 108 states have (on average 2.7314814814814814) internal successors, (295), 108 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:59:01,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:59:01,835 INFO L93 Difference]: Finished difference Result 151 states and 152 transitions. [2021-11-25 19:59:01,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-25 19:59:01,836 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 108 states have (on average 2.7314814814814814) internal successors, (295), 108 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2021-11-25 19:59:01,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:59:01,837 INFO L225 Difference]: With dead ends: 151 [2021-11-25 19:59:01,837 INFO L226 Difference]: Without dead ends: 151 [2021-11-25 19:59:01,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 535 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6599 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=4999, Invalid=23057, Unknown=0, NotChecked=0, Total=28056 [2021-11-25 19:59:01,838 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 960 mSDsluCounter, 1428 mSDsCounter, 0 mSdLazyCounter, 4413 mSolverCounterSat, 319 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 960 SdHoareTripleChecker+Valid, 769 SdHoareTripleChecker+Invalid, 4732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 319 IncrementalHoareTripleChecker+Valid, 4413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:59:01,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [960 Valid, 769 Invalid, 4732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [319 Valid, 4413 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 19:59:01,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-25 19:59:01,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2021-11-25 19:59:01,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.0134228187919463) internal successors, (151), 149 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 19:59:01,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2021-11-25 19:59:01,843 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 145 [2021-11-25 19:59:01,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:59:01,843 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2021-11-25 19:59:01,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 108 states have (on average 2.7314814814814814) internal successors, (295), 108 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:59:01,843 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2021-11-25 19:59:01,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-25 19:59:01,844 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:59:01,844 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 1, 1, 1, 1] [2021-11-25 19:59:01,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 19:59:02,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-25 19:59:02,051 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:59:02,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:59:02,057 INFO L85 PathProgramCache]: Analyzing trace with hash 968654291, now seen corresponding path program 26 times [2021-11-25 19:59:02,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:59:02,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952415808] [2021-11-25 19:59:02,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:59:02,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:59:02,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:59:03,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 48 proven. 1680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:03,464 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:59:03,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952415808] [2021-11-25 19:59:03,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952415808] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:59:03,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829511330] [2021-11-25 19:59:03,464 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:59:03,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:59:03,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:59:03,465 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:59:03,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 19:59:19,737 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-25 19:59:19,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:59:19,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 859 conjuncts, 110 conjunts are in the unsatisfiable core [2021-11-25 19:59:19,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:59:19,764 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:59:21,262 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 19:59:21,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 48 proven. 1680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:21,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:59:26,176 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 48 proven. 1680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:26,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829511330] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:59:26,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1287289387] [2021-11-25 19:59:26,178 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:59:26,178 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:59:26,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:59:26,178 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:59:26,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:59:26,210 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 6 treesize of output 5 [2021-11-25 19:59:26,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:59:26,262 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 14 treesize of output 10 [2021-11-25 19:59:26,627 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:59:29,007 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19721#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:59:29,007 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:59:29,007 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:59:29,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 127 [2021-11-25 19:59:29,007 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667458534] [2021-11-25 19:59:29,008 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:59:29,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2021-11-25 19:59:29,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:59:29,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2021-11-25 19:59:29,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=18002, Unknown=0, NotChecked=0, Total=18360 [2021-11-25 19:59:29,010 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand has 128 states, 128 states have (on average 2.7109375) internal successors, (347), 127 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:59:42,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:59:42,237 INFO L93 Difference]: Finished difference Result 250 states and 251 transitions. [2021-11-25 19:59:42,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-25 19:59:42,237 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 2.7109375) internal successors, (347), 127 states have internal predecessors, (347), 0 states have call successors, (0), 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 149 [2021-11-25 19:59:42,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:59:42,238 INFO L225 Difference]: With dead ends: 250 [2021-11-25 19:59:42,238 INFO L226 Difference]: Without dead ends: 153 [2021-11-25 19:59:42,239 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6165 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=1255, Invalid=32785, Unknown=0, NotChecked=0, Total=34040 [2021-11-25 19:59:42,240 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 1804 mSDsluCounter, 3500 mSDsCounter, 0 mSdLazyCounter, 8225 mSolverCounterSat, 649 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1804 SdHoareTripleChecker+Valid, 3486 SdHoareTripleChecker+Invalid, 8874 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 649 IncrementalHoareTripleChecker+Valid, 8225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:59:42,240 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1804 Valid, 3486 Invalid, 8874 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [649 Valid, 8225 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2021-11-25 19:59:42,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-11-25 19:59:42,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2021-11-25 19:59:42,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.0132450331125828) internal successors, (153), 151 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:59:42,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 153 transitions. [2021-11-25 19:59:42,244 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 153 transitions. Word has length 149 [2021-11-25 19:59:42,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:59:42,244 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 153 transitions. [2021-11-25 19:59:42,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 2.7109375) internal successors, (347), 127 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:59:42,244 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 153 transitions. [2021-11-25 19:59:42,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-25 19:59:42,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:59:42,245 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 25, 24, 24, 24, 1, 1, 1, 1] [2021-11-25 19:59:42,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 19:59:42,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-25 19:59:42,454 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:59:42,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:59:42,455 INFO L85 PathProgramCache]: Analyzing trace with hash 450261922, now seen corresponding path program 27 times [2021-11-25 19:59:42,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:59:42,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792959437] [2021-11-25 19:59:42,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:59:42,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:59:42,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:59:43,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1777 backedges. 529 proven. 1248 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:43,996 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:59:43,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792959437] [2021-11-25 19:59:43,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792959437] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:59:43,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089018726] [2021-11-25 19:59:43,996 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:59:43,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:59:43,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:59:43,998 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:59:43,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 19:59:44,555 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:59:44,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:59:44,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 872 conjuncts, 239 conjunts are in the unsatisfiable core [2021-11-25 19:59:44,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:59:46,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1777 backedges. 600 proven. 1177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:46,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:59:47,832 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 22 treesize of output 18 [2021-11-25 19:59:49,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1777 backedges. 600 proven. 1177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:49,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1089018726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:59:49,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [896748396] [2021-11-25 19:59:49,547 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 19:59:49,547 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:59:49,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:59:49,548 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:59:49,548 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:59:49,572 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 6 treesize of output 5 [2021-11-25 19:59:49,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 19:59:49,640 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 19:59:50,048 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:59:52,028 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21263#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 19:59:52,028 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:59:52,029 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:59:52,029 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 132 [2021-11-25 19:59:52,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292044231] [2021-11-25 19:59:52,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:59:52,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2021-11-25 19:59:52,030 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:59:52,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2021-11-25 19:59:52,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2500, Invalid=17522, Unknown=0, NotChecked=0, Total=20022 [2021-11-25 19:59:52,031 INFO L87 Difference]: Start difference. First operand 152 states and 153 transitions. Second operand has 134 states, 133 states have (on average 2.661654135338346) internal successors, (354), 133 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:59:56,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:59:56,072 INFO L93 Difference]: Finished difference Result 157 states and 158 transitions. [2021-11-25 19:59:56,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-25 19:59:56,072 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 133 states have (on average 2.661654135338346) internal successors, (354), 133 states have internal predecessors, (354), 0 states have call successors, (0), 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 151 [2021-11-25 19:59:56,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:59:56,073 INFO L225 Difference]: With dead ends: 157 [2021-11-25 19:59:56,073 INFO L226 Difference]: Without dead ends: 157 [2021-11-25 19:59:56,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9721 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=7644, Invalid=30186, Unknown=0, NotChecked=0, Total=37830 [2021-11-25 19:59:56,077 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 1241 mSDsluCounter, 1353 mSDsCounter, 0 mSdLazyCounter, 4327 mSolverCounterSat, 406 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1241 SdHoareTripleChecker+Valid, 698 SdHoareTripleChecker+Invalid, 4733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 406 IncrementalHoareTripleChecker+Valid, 4327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:59:56,077 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1241 Valid, 698 Invalid, 4733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [406 Valid, 4327 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 19:59:56,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-25 19:59:56,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2021-11-25 19:59:56,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.0129032258064516) internal successors, (157), 155 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 19:59:56,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 157 transitions. [2021-11-25 19:59:56,080 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 157 transitions. Word has length 151 [2021-11-25 19:59:56,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:59:56,081 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 157 transitions. [2021-11-25 19:59:56,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 133 states have (on average 2.661654135338346) internal successors, (354), 133 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:59:56,081 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 157 transitions. [2021-11-25 19:59:56,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-25 19:59:56,082 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:59:56,082 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 1, 1, 1, 1] [2021-11-25 19:59:56,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-25 19:59:56,300 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-25 19:59:56,300 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 19:59:56,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:59:56,300 INFO L85 PathProgramCache]: Analyzing trace with hash 492122578, now seen corresponding path program 28 times [2021-11-25 19:59:56,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:59:56,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920210520] [2021-11-25 19:59:56,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:59:56,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:59:56,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:59:57,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1875 backedges. 50 proven. 1825 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:57,852 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:59:57,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920210520] [2021-11-25 19:59:57,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1920210520] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:59:57,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925750736] [2021-11-25 19:59:57,852 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:59:57,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:59:57,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:59:57,853 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:59:57,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 19:59:59,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:59:59,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 892 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-25 19:59:59,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:00,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1875 backedges. 50 proven. 1825 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:00:00,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:04,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1875 backedges. 50 proven. 1825 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:00:04,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925750736] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:04,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [361388630] [2021-11-25 20:00:04,535 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:00:04,535 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:00:04,536 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:00:04,536 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:00:04,536 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:00:04,558 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 6 treesize of output 5 [2021-11-25 20:00:04,577 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 20:00:04,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:00:04,938 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:00:07,200 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22724#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:00:07,200 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:00:07,200 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:00:07,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 109 [2021-11-25 20:00:07,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789048018] [2021-11-25 20:00:07,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:00:07,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2021-11-25 20:00:07,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:00:07,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2021-11-25 20:00:07,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=13499, Unknown=0, NotChecked=0, Total=13806 [2021-11-25 20:00:07,202 INFO L87 Difference]: Start difference. First operand 156 states and 157 transitions. Second operand has 110 states, 110 states have (on average 2.8363636363636364) internal successors, (312), 109 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:13,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:00:13,571 INFO L93 Difference]: Finished difference Result 260 states and 261 transitions. [2021-11-25 20:00:13,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-25 20:00:13,572 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 2.8363636363636364) internal successors, (312), 109 states have internal predecessors, (312), 0 states have call successors, (0), 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 155 [2021-11-25 20:00:13,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:00:13,573 INFO L225 Difference]: With dead ends: 260 [2021-11-25 20:00:13,573 INFO L226 Difference]: Without dead ends: 159 [2021-11-25 20:00:13,575 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 399 SyntacticMatches, 2 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3688 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=610, Invalid=27446, Unknown=0, NotChecked=0, Total=28056 [2021-11-25 20:00:13,576 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 231 mSDsluCounter, 5864 mSDsCounter, 0 mSdLazyCounter, 6383 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 5897 SdHoareTripleChecker+Invalid, 6486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 6383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:00:13,576 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [231 Valid, 5897 Invalid, 6486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 6383 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2021-11-25 20:00:13,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-25 20:00:13,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 158. [2021-11-25 20:00:13,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 157 states have (on average 1.0127388535031847) internal successors, (159), 157 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:13,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2021-11-25 20:00:13,580 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 155 [2021-11-25 20:00:13,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:00:13,580 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2021-11-25 20:00:13,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 2.8363636363636364) internal successors, (312), 109 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:13,581 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2021-11-25 20:00:13,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-25 20:00:13,582 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:00:13,582 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 1, 1, 1, 1] [2021-11-25 20:00:13,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 20:00:13,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-25 20:00:13,795 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 20:00:13,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:00:13,796 INFO L85 PathProgramCache]: Analyzing trace with hash 613240929, now seen corresponding path program 29 times [2021-11-25 20:00:13,796 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:00:13,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483998110] [2021-11-25 20:00:13,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:00:13,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:00:13,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:00:15,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 576 proven. 1350 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:00:15,404 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:00:15,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483998110] [2021-11-25 20:00:15,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483998110] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:00:15,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [336759862] [2021-11-25 20:00:15,404 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:00:15,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:00:15,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:00:15,405 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:00:15,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 20:00:36,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-11-25 20:00:36,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:00:36,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 892 conjuncts, 293 conjunts are in the unsatisfiable core [2021-11-25 20:00:36,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:36,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:00:42,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 26 proven. 1250 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-11-25 20:00:42,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:52,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 0 proven. 1506 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-11-25 20:00:52,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [336759862] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:52,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [778312983] [2021-11-25 20:00:52,599 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:00:52,600 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:00:52,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:00:52,600 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:00:52,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:00:52,626 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 6 treesize of output 5 [2021-11-25 20:00:52,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:00:52,671 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 20:00:53,037 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:00:56,238 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24362#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:00:56,238 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:00:56,239 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:00:56,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 57, 62] total 174 [2021-11-25 20:00:56,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377329277] [2021-11-25 20:00:56,239 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:00:56,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 176 states [2021-11-25 20:00:56,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:00:56,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2021-11-25 20:00:56,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2907, Invalid=30765, Unknown=0, NotChecked=0, Total=33672 [2021-11-25 20:00:56,243 INFO L87 Difference]: Start difference. First operand 158 states and 159 transitions. Second operand has 176 states, 175 states have (on average 2.1885714285714286) internal successors, (383), 175 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:10,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:02:10,791 INFO L93 Difference]: Finished difference Result 262 states and 263 transitions. [2021-11-25 20:02:10,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 160 states. [2021-11-25 20:02:10,792 INFO L78 Accepts]: Start accepts. Automaton has has 176 states, 175 states have (on average 2.1885714285714286) internal successors, (383), 175 states have internal predecessors, (383), 0 states have call successors, (0), 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 157 [2021-11-25 20:02:10,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:02:10,793 INFO L225 Difference]: With dead ends: 262 [2021-11-25 20:02:10,793 INFO L226 Difference]: Without dead ends: 262 [2021-11-25 20:02:10,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 340 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17285 ImplicationChecksByTransitivity, 86.5s TimeCoverageRelationStatistics Valid=19849, Invalid=96773, Unknown=0, NotChecked=0, Total=116622 [2021-11-25 20:02:10,798 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 1597 mSDsluCounter, 1394 mSDsCounter, 0 mSdLazyCounter, 8418 mSolverCounterSat, 2081 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1597 SdHoareTripleChecker+Valid, 1418 SdHoareTripleChecker+Invalid, 10499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2081 IncrementalHoareTripleChecker+Valid, 8418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:02:10,798 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1597 Valid, 1418 Invalid, 10499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2081 Valid, 8418 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2021-11-25 20:02:10,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-25 20:02:10,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 262. [2021-11-25 20:02:10,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.0076628352490422) internal successors, (263), 261 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:10,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2021-11-25 20:02:10,802 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 157 [2021-11-25 20:02:10,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:02:10,803 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2021-11-25 20:02:10,803 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 176 states, 175 states have (on average 2.1885714285714286) internal successors, (383), 175 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:10,803 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2021-11-25 20:02:10,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2021-11-25 20:02:10,805 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:02:10,805 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 26, 26, 1, 1, 1, 1] [2021-11-25 20:02:10,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 20:02:11,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:02:11,015 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 20:02:11,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:02:11,016 INFO L85 PathProgramCache]: Analyzing trace with hash -272611775, now seen corresponding path program 30 times [2021-11-25 20:02:11,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:02:11,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340260432] [2021-11-25 20:02:11,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:02:11,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:02:11,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:02:12,781 INFO L134 CoverageAnalysis]: Checked inductivity of 5878 backedges. 3925 proven. 753 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2021-11-25 20:02:12,782 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:02:12,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340260432] [2021-11-25 20:02:12,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1340260432] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:02:12,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582103461] [2021-11-25 20:02:12,782 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:02:12,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:02:12,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:02:12,791 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:02:12,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 20:02:13,426 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:02:13,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:02:13,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 1425 conjuncts, 318 conjunts are in the unsatisfiable core [2021-11-25 20:02:13,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:02:13,445 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:02:18,928 INFO L134 CoverageAnalysis]: Checked inductivity of 5878 backedges. 5071 proven. 767 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 20:02:18,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:02:23,179 INFO L134 CoverageAnalysis]: Checked inductivity of 5878 backedges. 5070 proven. 768 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 20:02:23,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582103461] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:02:23,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [124808155] [2021-11-25 20:02:23,182 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:02:23,182 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:02:23,182 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:02:23,182 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:02:23,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:02:23,194 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 6 treesize of output 5 [2021-11-25 20:02:23,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:02:23,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:02:23,596 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:02:25,846 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26956#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:02:25,846 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:02:25,846 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:02:25,846 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 78, 78] total 185 [2021-11-25 20:02:25,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786961227] [2021-11-25 20:02:25,847 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:02:25,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 186 states [2021-11-25 20:02:25,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:02:25,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2021-11-25 20:02:25,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7341, Invalid=30101, Unknown=0, NotChecked=0, Total=37442 [2021-11-25 20:02:25,852 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand has 186 states, 186 states have (on average 2.924731182795699) internal successors, (544), 185 states have internal predecessors, (544), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:33,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:02:33,521 INFO L93 Difference]: Finished difference Result 598 states and 618 transitions. [2021-11-25 20:02:33,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2021-11-25 20:02:33,521 INFO L78 Accepts]: Start accepts. Automaton has has 186 states, 186 states have (on average 2.924731182795699) internal successors, (544), 185 states have internal predecessors, (544), 0 states have call successors, (0), 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 261 [2021-11-25 20:02:33,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:02:33,523 INFO L225 Difference]: With dead ends: 598 [2021-11-25 20:02:33,523 INFO L226 Difference]: Without dead ends: 304 [2021-11-25 20:02:33,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 944 GetRequests, 646 SyntacticMatches, 1 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25149 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=18943, Invalid=70159, Unknown=0, NotChecked=0, Total=89102 [2021-11-25 20:02:33,529 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 133 mSDsluCounter, 1308 mSDsCounter, 0 mSdLazyCounter, 2413 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 2531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 2413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:02:33,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 725 Invalid, 2531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 2413 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 20:02:33,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-11-25 20:02:33,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 304. [2021-11-25 20:02:33,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 303 states have (on average 1.0066006600660067) internal successors, (305), 303 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:33,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 305 transitions. [2021-11-25 20:02:33,536 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 305 transitions. Word has length 261 [2021-11-25 20:02:33,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:02:33,536 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 305 transitions. [2021-11-25 20:02:33,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 186 states, 186 states have (on average 2.924731182795699) internal successors, (544), 185 states have internal predecessors, (544), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:33,537 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 305 transitions. [2021-11-25 20:02:33,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2021-11-25 20:02:33,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:02:33,538 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 47, 47, 1, 1, 1, 1] [2021-11-25 20:02:33,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-25 20:02:33,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-25 20:02:33,747 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 20:02:33,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:02:33,747 INFO L85 PathProgramCache]: Analyzing trace with hash 2056141500, now seen corresponding path program 31 times [2021-11-25 20:02:33,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:02:33,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323451078] [2021-11-25 20:02:33,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:02:33,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:02:34,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:02:37,632 INFO L134 CoverageAnalysis]: Checked inductivity of 7411 backedges. 5131 proven. 2256 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 20:02:37,632 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:02:37,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323451078] [2021-11-25 20:02:37,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323451078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:02:37,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479260453] [2021-11-25 20:02:37,633 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:02:37,633 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:02:37,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:02:37,633 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:02:37,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 20:02:37,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:02:37,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 1698 conjuncts, 345 conjunts are in the unsatisfiable core [2021-11-25 20:02:37,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:02:37,990 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:02:47,157 INFO L134 CoverageAnalysis]: Checked inductivity of 7411 backedges. 5085 proven. 2302 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 20:02:47,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:02:53,328 INFO L134 CoverageAnalysis]: Checked inductivity of 7411 backedges. 5084 proven. 2303 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 20:02:53,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479260453] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:02:53,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [791987849] [2021-11-25 20:02:53,329 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:02:53,330 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:02:53,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:02:53,330 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:02:53,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:02:53,350 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 6 treesize of output 5 [2021-11-25 20:02:53,391 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 20:02:53,418 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 20:02:53,757 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:02:56,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30136#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:02:56,360 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:02:56,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:02:56,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 100, 100] total 247 [2021-11-25 20:02:56,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881803840] [2021-11-25 20:02:56,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:02:56,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 248 states [2021-11-25 20:02:56,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:02:56,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 248 interpolants. [2021-11-25 20:02:56,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8704, Invalid=56576, Unknown=0, NotChecked=0, Total=65280 [2021-11-25 20:02:56,366 INFO L87 Difference]: Start difference. First operand 304 states and 305 transitions. Second operand has 248 states, 248 states have (on average 2.7298387096774195) internal successors, (677), 247 states have internal predecessors, (677), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:10,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:03:10,776 INFO L93 Difference]: Finished difference Result 498 states and 499 transitions. [2021-11-25 20:03:10,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2021-11-25 20:03:10,777 INFO L78 Accepts]: Start accepts. Automaton has has 248 states, 248 states have (on average 2.7298387096774195) internal successors, (677), 247 states have internal predecessors, (677), 0 states have call successors, (0), 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 303 [2021-11-25 20:03:10,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:03:10,778 INFO L225 Difference]: With dead ends: 498 [2021-11-25 20:03:10,778 INFO L226 Difference]: Without dead ends: 307 [2021-11-25 20:03:10,785 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1151 GetRequests, 751 SyntacticMatches, 1 SemanticMatches, 399 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43945 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=27273, Invalid=133127, Unknown=0, NotChecked=0, Total=160400 [2021-11-25 20:03:10,786 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 149 mSDsluCounter, 1739 mSDsCounter, 0 mSdLazyCounter, 3135 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 971 SdHoareTripleChecker+Invalid, 3164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 3135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:03:10,786 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 971 Invalid, 3164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 3135 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-25 20:03:10,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2021-11-25 20:03:10,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 306. [2021-11-25 20:03:10,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 305 states have (on average 1.0065573770491802) internal successors, (307), 305 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:10,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 307 transitions. [2021-11-25 20:03:10,792 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 307 transitions. Word has length 303 [2021-11-25 20:03:10,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:03:10,792 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 307 transitions. [2021-11-25 20:03:10,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 248 states, 248 states have (on average 2.7298387096774195) internal successors, (677), 247 states have internal predecessors, (677), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:10,793 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 307 transitions. [2021-11-25 20:03:10,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-11-25 20:03:10,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:03:10,795 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 48, 48, 1, 1, 1, 1] [2021-11-25 20:03:10,834 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-25 20:03:11,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-25 20:03:11,014 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-25 20:03:11,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:03:11,015 INFO L85 PathProgramCache]: Analyzing trace with hash -1625519157, now seen corresponding path program 32 times [2021-11-25 20:03:11,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:03:11,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962501028] [2021-11-25 20:03:11,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:03:11,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:03:11,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:03:14,900 INFO L134 CoverageAnalysis]: Checked inductivity of 7506 backedges. 5142 proven. 2352 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:03:14,900 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:03:14,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962501028] [2021-11-25 20:03:14,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962501028] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:03:14,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773475877] [2021-11-25 20:03:14,900 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:03:14,900 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:03:14,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:03:14,901 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:03:14,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ecc3ba5-f78d-47a7-8e36-1196d57be429/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process