./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash efc4103a673d30f5c3fd98741c7d56d84f1ec5a0e9e3b77a4d9f9d9493ec5192 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 18:03:34,409 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 18:03:34,412 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 18:03:34,450 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 18:03:34,451 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 18:03:34,452 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 18:03:34,455 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 18:03:34,458 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 18:03:34,461 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 18:03:34,462 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 18:03:34,464 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 18:03:34,465 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 18:03:34,466 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 18:03:34,468 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 18:03:34,470 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 18:03:34,472 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 18:03:34,474 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 18:03:34,475 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 18:03:34,478 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 18:03:34,482 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 18:03:34,484 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 18:03:34,486 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 18:03:34,488 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 18:03:34,490 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 18:03:34,494 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 18:03:34,495 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 18:03:34,495 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 18:03:34,497 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 18:03:34,498 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 18:03:34,499 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 18:03:34,500 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 18:03:34,501 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 18:03:34,502 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 18:03:34,504 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 18:03:34,506 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 18:03:34,506 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 18:03:34,507 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 18:03:34,508 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 18:03:34,508 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 18:03:34,509 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 18:03:34,510 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 18:03:34,511 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-13 18:03:34,542 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 18:03:34,543 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 18:03:34,543 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-13 18:03:34,543 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-13 18:03:34,544 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 18:03:34,544 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 18:03:34,545 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-13 18:03:34,546 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-13 18:03:34,546 INFO L138 SettingsManager]: * Use SBE=true [2021-11-13 18:03:34,546 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 18:03:34,547 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 18:03:34,547 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 18:03:34,547 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 18:03:34,547 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 18:03:34,548 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 18:03:34,548 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 18:03:34,548 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 18:03:34,549 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 18:03:34,549 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 18:03:34,549 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 18:03:34,549 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 18:03:34,550 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 18:03:34,550 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-13 18:03:34,550 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 18:03:34,550 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:03:34,551 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 18:03:34,551 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 18:03:34,551 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 18:03:34,552 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-13 18:03:34,552 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 18:03:34,552 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-13 18:03:34,552 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-13 18:03:34,553 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 18:03:34,553 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 18:03:34,553 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> efc4103a673d30f5c3fd98741c7d56d84f1ec5a0e9e3b77a4d9f9d9493ec5192 [2021-11-13 18:03:34,894 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 18:03:34,920 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 18:03:34,924 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 18:03:34,925 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 18:03:34,926 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 18:03:34,928 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/../../sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound100.c [2021-11-13 18:03:35,008 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/data/7e974b58d/657db1dceb7f45b1b7287c9710a4e3e4/FLAG9bc2d98a5 [2021-11-13 18:03:35,519 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 18:03:35,522 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound100.c [2021-11-13 18:03:35,537 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/data/7e974b58d/657db1dceb7f45b1b7287c9710a4e3e4/FLAG9bc2d98a5 [2021-11-13 18:03:35,876 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/data/7e974b58d/657db1dceb7f45b1b7287c9710a4e3e4 [2021-11-13 18:03:35,881 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 18:03:35,884 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 18:03:35,888 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 18:03:35,889 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 18:03:35,893 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 18:03:35,894 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:03:35" (1/1) ... [2021-11-13 18:03:35,895 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4239a516 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:35, skipping insertion in model container [2021-11-13 18:03:35,896 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:03:35" (1/1) ... [2021-11-13 18:03:35,902 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 18:03:35,920 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 18:03:36,110 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound100.c[538,551] [2021-11-13 18:03:36,166 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:03:36,180 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 18:03:36,200 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound100.c[538,551] [2021-11-13 18:03:36,223 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:03:36,240 INFO L208 MainTranslator]: Completed translation [2021-11-13 18:03:36,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36 WrapperNode [2021-11-13 18:03:36,241 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 18:03:36,242 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 18:03:36,242 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 18:03:36,242 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 18:03:36,249 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (1/1) ... [2021-11-13 18:03:36,256 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (1/1) ... [2021-11-13 18:03:36,279 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 18:03:36,280 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 18:03:36,281 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 18:03:36,281 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 18:03:36,290 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (1/1) ... [2021-11-13 18:03:36,290 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (1/1) ... [2021-11-13 18:03:36,292 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (1/1) ... [2021-11-13 18:03:36,293 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (1/1) ... [2021-11-13 18:03:36,298 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (1/1) ... [2021-11-13 18:03:36,302 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (1/1) ... [2021-11-13 18:03:36,304 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (1/1) ... [2021-11-13 18:03:36,306 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 18:03:36,307 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 18:03:36,307 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 18:03:36,308 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 18:03:36,309 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (1/1) ... [2021-11-13 18:03:36,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:03:36,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:03:36,369 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 18:03:36,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 18:03:36,417 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 18:03:36,417 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 18:03:36,417 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 18:03:36,418 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 18:03:36,418 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-13 18:03:36,418 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-13 18:03:36,654 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 18:03:36,654 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-13 18:03:36,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:03:36 BoogieIcfgContainer [2021-11-13 18:03:36,656 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 18:03:36,658 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 18:03:36,658 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 18:03:36,662 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 18:03:36,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 06:03:35" (1/3) ... [2021-11-13 18:03:36,663 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b7b8003 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:03:36, skipping insertion in model container [2021-11-13 18:03:36,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:03:36" (2/3) ... [2021-11-13 18:03:36,664 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b7b8003 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:03:36, skipping insertion in model container [2021-11-13 18:03:36,664 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:03:36" (3/3) ... [2021-11-13 18:03:36,665 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-ll_unwindbound100.c [2021-11-13 18:03:36,671 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 18:03:36,671 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 18:03:36,721 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 18:03:36,729 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-13 18:03:36,729 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 18:03:36,746 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 19 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:03:36,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-13 18:03:36,751 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:36,752 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:36,753 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:36,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:36,758 INFO L85 PathProgramCache]: Analyzing trace with hash -712527539, now seen corresponding path program 1 times [2021-11-13 18:03:36,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:36,768 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762874239] [2021-11-13 18:03:36,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:36,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:36,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:36,917 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:03:36,918 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:36,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762874239] [2021-11-13 18:03:36,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762874239] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:03:36,920 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:03:36,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-13 18:03:36,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236150689] [2021-11-13 18:03:36,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:03:36,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-13 18:03:36,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:36,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-13 18:03:36,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-13 18:03:36,964 INFO L87 Difference]: Start difference. First operand has 28 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 19 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:03:36,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:36,998 INFO L93 Difference]: Finished difference Result 53 states and 87 transitions. [2021-11-13 18:03:36,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-13 18:03:37,000 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-13 18:03:37,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:37,008 INFO L225 Difference]: With dead ends: 53 [2021-11-13 18:03:37,009 INFO L226 Difference]: Without dead ends: 24 [2021-11-13 18:03:37,012 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-13 18:03:37,016 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.35ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:37,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 1.35ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-13 18:03:37,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-13 18:03:37,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-13 18:03:37,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 18:03:37,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 34 transitions. [2021-11-13 18:03:37,061 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 34 transitions. Word has length 10 [2021-11-13 18:03:37,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:37,062 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 34 transitions. [2021-11-13 18:03:37,062 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:03:37,062 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 34 transitions. [2021-11-13 18:03:37,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-13 18:03:37,063 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:37,063 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:37,064 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 18:03:37,064 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:37,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:37,065 INFO L85 PathProgramCache]: Analyzing trace with hash -1983932575, now seen corresponding path program 1 times [2021-11-13 18:03:37,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:37,066 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366767694] [2021-11-13 18:03:37,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:37,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:37,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:37,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:03:37,190 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:37,191 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366767694] [2021-11-13 18:03:37,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366767694] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:03:37,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:03:37,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 18:03:37,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491069149] [2021-11-13 18:03:37,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:03:37,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:03:37,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:37,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:03:37,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:03:37,195 INFO L87 Difference]: Start difference. First operand 24 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:03:37,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:37,312 INFO L93 Difference]: Finished difference Result 38 states and 53 transitions. [2021-11-13 18:03:37,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:03:37,313 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-13 18:03:37,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:37,314 INFO L225 Difference]: With dead ends: 38 [2021-11-13 18:03:37,314 INFO L226 Difference]: Without dead ends: 36 [2021-11-13 18:03:37,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:03:37,317 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 15 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 54.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.27ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 70.56ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:37,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 112 Invalid, 22 Unknown, 0 Unchecked, 4.27ms Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 70.56ms Time] [2021-11-13 18:03:37,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-13 18:03:37,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2021-11-13 18:03:37,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 18:03:37,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2021-11-13 18:03:37,342 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 10 [2021-11-13 18:03:37,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:37,342 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2021-11-13 18:03:37,343 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:03:37,343 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2021-11-13 18:03:37,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-13 18:03:37,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:37,344 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:37,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-13 18:03:37,344 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:37,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:37,345 INFO L85 PathProgramCache]: Analyzing trace with hash 1787143384, now seen corresponding path program 1 times [2021-11-13 18:03:37,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:37,346 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860677031] [2021-11-13 18:03:37,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:37,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:37,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:37,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:03:37,415 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:37,416 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860677031] [2021-11-13 18:03:37,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860677031] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:03:37,416 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:03:37,416 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 18:03:37,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161258293] [2021-11-13 18:03:37,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:03:37,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 18:03:37,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:37,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 18:03:37,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 18:03:37,419 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:03:37,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:37,441 INFO L93 Difference]: Finished difference Result 44 states and 59 transitions. [2021-11-13 18:03:37,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 18:03:37,442 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-13 18:03:37,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:37,443 INFO L225 Difference]: With dead ends: 44 [2021-11-13 18:03:37,443 INFO L226 Difference]: Without dead ends: 30 [2021-11-13 18:03:37,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 18:03:37,446 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.32ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.44ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:37,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 89 Invalid, 9 Unknown, 0 Unchecked, 2.32ms Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 12.44ms Time] [2021-11-13 18:03:37,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-13 18:03:37,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-13 18:03:37,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 18:03:37,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2021-11-13 18:03:37,459 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 12 [2021-11-13 18:03:37,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:37,460 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2021-11-13 18:03:37,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:03:37,460 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2021-11-13 18:03:37,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-13 18:03:37,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:37,461 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:37,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-13 18:03:37,462 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:37,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:37,463 INFO L85 PathProgramCache]: Analyzing trace with hash 472519838, now seen corresponding path program 1 times [2021-11-13 18:03:37,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:37,463 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628652516] [2021-11-13 18:03:37,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:37,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:37,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:37,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:03:37,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:37,608 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:03:37,608 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:37,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628652516] [2021-11-13 18:03:37,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1628652516] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:03:37,609 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:03:37,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 18:03:37,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823394181] [2021-11-13 18:03:37,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:03:37,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:03:37,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:37,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:03:37,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:03:37,612 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:03:37,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:37,720 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2021-11-13 18:03:37,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:03:37,721 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-13 18:03:37,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:37,723 INFO L225 Difference]: With dead ends: 44 [2021-11-13 18:03:37,724 INFO L226 Difference]: Without dead ends: 42 [2021-11-13 18:03:37,724 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:03:37,729 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 13 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 72.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.79ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 85.17ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:37,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 108 Invalid, 32 Unknown, 0 Unchecked, 3.79ms Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 85.17ms Time] [2021-11-13 18:03:37,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-13 18:03:37,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2021-11-13 18:03:37,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 18:03:37,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2021-11-13 18:03:37,742 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 15 [2021-11-13 18:03:37,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:37,743 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2021-11-13 18:03:37,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:03:37,744 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2021-11-13 18:03:37,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-13 18:03:37,744 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:37,745 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:37,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-13 18:03:37,745 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:37,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:37,746 INFO L85 PathProgramCache]: Analyzing trace with hash 838495553, now seen corresponding path program 1 times [2021-11-13 18:03:37,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:37,747 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718904207] [2021-11-13 18:03:37,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:37,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:37,767 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:03:37,767 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [603571808] [2021-11-13 18:03:37,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:37,768 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:37,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:03:37,770 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:03:37,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 18:03:37,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:37,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-13 18:03:37,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:03:38,044 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:03:38,044 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:03:38,045 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:38,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718904207] [2021-11-13 18:03:38,045 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:03:38,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603571808] [2021-11-13 18:03:38,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603571808] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:03:38,046 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:03:38,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 18:03:38,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873379965] [2021-11-13 18:03:38,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:03:38,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:03:38,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:38,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:03:38,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:03:38,050 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-13 18:03:38,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:38,161 INFO L93 Difference]: Finished difference Result 63 states and 85 transitions. [2021-11-13 18:03:38,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:03:38,162 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2021-11-13 18:03:38,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:38,164 INFO L225 Difference]: With dead ends: 63 [2021-11-13 18:03:38,164 INFO L226 Difference]: Without dead ends: 48 [2021-11-13 18:03:38,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:03:38,166 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 10 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 68.91ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.37ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 85.32ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:38,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 122 Invalid, 40 Unknown, 0 Unchecked, 3.37ms Time], IncrementalHoareTripleChecker [3 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 85.32ms Time] [2021-11-13 18:03:38,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-13 18:03:38,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-13 18:03:38,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 32 states have internal predecessors, (38), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-13 18:03:38,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 62 transitions. [2021-11-13 18:03:38,199 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 62 transitions. Word has length 20 [2021-11-13 18:03:38,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:38,200 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 62 transitions. [2021-11-13 18:03:38,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-13 18:03:38,201 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 62 transitions. [2021-11-13 18:03:38,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-13 18:03:38,202 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:38,202 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:38,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 18:03:38,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:38,403 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:38,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:38,404 INFO L85 PathProgramCache]: Analyzing trace with hash 414140572, now seen corresponding path program 1 times [2021-11-13 18:03:38,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:38,405 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725494362] [2021-11-13 18:03:38,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:38,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:38,427 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:03:38,428 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1875124157] [2021-11-13 18:03:38,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:38,428 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:38,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:03:38,429 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:03:38,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 18:03:38,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:38,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 18:03:38,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:03:38,654 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 18:03:38,654 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:03:38,654 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:38,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725494362] [2021-11-13 18:03:38,655 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:03:38,655 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875124157] [2021-11-13 18:03:38,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1875124157] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:03:38,655 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:03:38,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 18:03:38,656 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905428743] [2021-11-13 18:03:38,656 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:03:38,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:03:38,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:38,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:03:38,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:03:38,657 INFO L87 Difference]: Start difference. First operand 48 states and 62 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:03:38,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:38,724 INFO L93 Difference]: Finished difference Result 68 states and 78 transitions. [2021-11-13 18:03:38,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:03:38,729 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 28 [2021-11-13 18:03:38,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:38,730 INFO L225 Difference]: With dead ends: 68 [2021-11-13 18:03:38,730 INFO L226 Difference]: Without dead ends: 61 [2021-11-13 18:03:38,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:03:38,732 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 4 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 37.22ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.75ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 54.13ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:38,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 117 Invalid, 21 Unknown, 0 Unchecked, 1.75ms Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 54.13ms Time] [2021-11-13 18:03:38,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-13 18:03:38,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2021-11-13 18:03:38,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 41 states have internal predecessors, (46), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-13 18:03:38,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2021-11-13 18:03:38,760 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 28 [2021-11-13 18:03:38,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:38,761 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2021-11-13 18:03:38,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:03:38,761 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2021-11-13 18:03:38,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-13 18:03:38,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:38,762 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:38,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 18:03:38,988 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-13 18:03:38,988 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:38,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:38,989 INFO L85 PathProgramCache]: Analyzing trace with hash 415868450, now seen corresponding path program 1 times [2021-11-13 18:03:38,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:38,989 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989481688] [2021-11-13 18:03:38,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:38,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:39,007 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:03:39,012 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1846899615] [2021-11-13 18:03:39,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:39,012 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:39,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:03:39,014 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:03:39,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 18:03:39,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:39,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-13 18:03:39,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:03:39,393 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 18:03:39,394 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:03:39,394 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:39,394 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989481688] [2021-11-13 18:03:39,394 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:03:39,395 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1846899615] [2021-11-13 18:03:39,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1846899615] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:03:39,396 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:03:39,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-13 18:03:39,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290237526] [2021-11-13 18:03:39,396 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:03:39,397 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 18:03:39,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:39,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 18:03:39,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:03:39,398 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:03:39,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:39,519 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2021-11-13 18:03:39,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:03:39,520 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 28 [2021-11-13 18:03:39,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:39,526 INFO L225 Difference]: With dead ends: 66 [2021-11-13 18:03:39,526 INFO L226 Difference]: Without dead ends: 50 [2021-11-13 18:03:39,527 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:03:39,532 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 10 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 64.74ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.65ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 76.81ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:39,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 144 Invalid, 54 Unknown, 0 Unchecked, 4.65ms Time], IncrementalHoareTripleChecker [7 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 76.81ms Time] [2021-11-13 18:03:39,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-13 18:03:39,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-13 18:03:39,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 34 states have internal predecessors, (39), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-13 18:03:39,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2021-11-13 18:03:39,547 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 28 [2021-11-13 18:03:39,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:39,547 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2021-11-13 18:03:39,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:03:39,548 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2021-11-13 18:03:39,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-13 18:03:39,549 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:39,549 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:39,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 18:03:39,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:39,769 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:39,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:39,770 INFO L85 PathProgramCache]: Analyzing trace with hash 1040101153, now seen corresponding path program 1 times [2021-11-13 18:03:39,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:39,770 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950198110] [2021-11-13 18:03:39,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:39,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:39,786 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:03:39,787 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1163328440] [2021-11-13 18:03:39,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:39,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:39,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:03:39,788 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:03:39,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 18:03:39,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:39,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 18:03:39,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:03:39,971 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 18:03:39,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:03:40,084 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 18:03:40,084 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:40,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950198110] [2021-11-13 18:03:40,085 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:03:40,086 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163328440] [2021-11-13 18:03:40,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163328440] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:03:40,089 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:03:40,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-13 18:03:40,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032481023] [2021-11-13 18:03:40,090 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:03:40,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:03:40,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:40,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:03:40,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:03:40,093 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:03:40,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:40,233 INFO L93 Difference]: Finished difference Result 115 states and 139 transitions. [2021-11-13 18:03:40,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-13 18:03:40,233 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 30 [2021-11-13 18:03:40,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:40,236 INFO L225 Difference]: With dead ends: 115 [2021-11-13 18:03:40,236 INFO L226 Difference]: Without dead ends: 101 [2021-11-13 18:03:40,237 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:03:40,238 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 42 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 59.78ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.64ms SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 75.37ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:40,238 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 199 Invalid, 74 Unknown, 0 Unchecked, 5.64ms Time], IncrementalHoareTripleChecker [12 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 75.37ms Time] [2021-11-13 18:03:40,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-13 18:03:40,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 95. [2021-11-13 18:03:40,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 64 states have internal predecessors, (74), 20 states have call successors, (20), 12 states have call predecessors, (20), 12 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-13 18:03:40,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 112 transitions. [2021-11-13 18:03:40,282 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 112 transitions. Word has length 30 [2021-11-13 18:03:40,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:40,285 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 112 transitions. [2021-11-13 18:03:40,285 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:03:40,285 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 112 transitions. [2021-11-13 18:03:40,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-13 18:03:40,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:40,289 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:40,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-13 18:03:40,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:40,504 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:40,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:40,504 INFO L85 PathProgramCache]: Analyzing trace with hash 1884102282, now seen corresponding path program 1 times [2021-11-13 18:03:40,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:40,504 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962987414] [2021-11-13 18:03:40,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:40,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:40,517 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:03:40,517 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [948809911] [2021-11-13 18:03:40,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:40,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:40,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:03:40,532 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:03:40,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-13 18:03:40,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:40,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-13 18:03:40,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:03:41,013 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 18:03:41,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:03:41,222 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 18:03:41,222 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:41,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962987414] [2021-11-13 18:03:41,222 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:03:41,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948809911] [2021-11-13 18:03:41,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948809911] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:03:41,223 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:03:41,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 12 [2021-11-13 18:03:41,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395767011] [2021-11-13 18:03:41,223 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:03:41,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-13 18:03:41,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:41,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-13 18:03:41,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-13 18:03:41,225 INFO L87 Difference]: Start difference. First operand 95 states and 112 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-13 18:03:41,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:41,628 INFO L93 Difference]: Finished difference Result 137 states and 170 transitions. [2021-11-13 18:03:41,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-13 18:03:41,628 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 38 [2021-11-13 18:03:41,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:41,631 INFO L225 Difference]: With dead ends: 137 [2021-11-13 18:03:41,631 INFO L226 Difference]: Without dead ends: 116 [2021-11-13 18:03:41,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-11-13 18:03:41,633 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 92 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 218.61ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.37ms SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 265.93ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:41,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 148 Invalid, 258 Unknown, 0 Unchecked, 5.37ms Time], IncrementalHoareTripleChecker [85 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 265.93ms Time] [2021-11-13 18:03:41,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-13 18:03:41,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 114. [2021-11-13 18:03:41,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 74 states have (on average 1.1756756756756757) internal successors, (87), 78 states have internal predecessors, (87), 25 states have call successors, (25), 14 states have call predecessors, (25), 14 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-13 18:03:41,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 134 transitions. [2021-11-13 18:03:41,651 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 134 transitions. Word has length 38 [2021-11-13 18:03:41,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:41,651 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 134 transitions. [2021-11-13 18:03:41,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-13 18:03:41,651 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 134 transitions. [2021-11-13 18:03:41,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-13 18:03:41,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:41,653 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:41,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-13 18:03:41,868 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-13 18:03:41,868 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:41,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:41,868 INFO L85 PathProgramCache]: Analyzing trace with hash 2101649637, now seen corresponding path program 1 times [2021-11-13 18:03:41,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:41,869 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041850399] [2021-11-13 18:03:41,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:41,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:41,879 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:03:41,879 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1045889917] [2021-11-13 18:03:41,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:41,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:41,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:03:41,881 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:03:41,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-13 18:03:41,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:41,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-13 18:03:41,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:03:42,083 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 18:03:42,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:03:42,216 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-13 18:03:42,217 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:42,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041850399] [2021-11-13 18:03:42,217 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:03:42,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045889917] [2021-11-13 18:03:42,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045889917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:03:42,217 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:03:42,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-11-13 18:03:42,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673853105] [2021-11-13 18:03:42,218 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:03:42,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 18:03:42,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:42,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 18:03:42,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:03:42,219 INFO L87 Difference]: Start difference. First operand 114 states and 134 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-13 18:03:42,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:42,405 INFO L93 Difference]: Finished difference Result 198 states and 233 transitions. [2021-11-13 18:03:42,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-13 18:03:42,405 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 46 [2021-11-13 18:03:42,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:42,407 INFO L225 Difference]: With dead ends: 198 [2021-11-13 18:03:42,408 INFO L226 Difference]: Without dead ends: 183 [2021-11-13 18:03:42,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2021-11-13 18:03:42,409 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 89 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 108.24ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.28ms SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 130.44ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:42,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 209 Invalid, 135 Unknown, 0 Unchecked, 3.28ms Time], IncrementalHoareTripleChecker [37 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 130.44ms Time] [2021-11-13 18:03:42,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-13 18:03:42,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 176. [2021-11-13 18:03:42,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 116 states have (on average 1.1724137931034482) internal successors, (136), 122 states have internal predecessors, (136), 37 states have call successors, (37), 22 states have call predecessors, (37), 22 states have return successors, (33), 31 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-13 18:03:42,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 206 transitions. [2021-11-13 18:03:42,432 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 206 transitions. Word has length 46 [2021-11-13 18:03:42,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:42,432 INFO L470 AbstractCegarLoop]: Abstraction has 176 states and 206 transitions. [2021-11-13 18:03:42,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-13 18:03:42,433 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 206 transitions. [2021-11-13 18:03:42,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-13 18:03:42,434 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:42,434 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:42,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-13 18:03:42,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:42,656 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:42,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:42,656 INFO L85 PathProgramCache]: Analyzing trace with hash 2103377515, now seen corresponding path program 1 times [2021-11-13 18:03:42,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:42,657 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634631490] [2021-11-13 18:03:42,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:42,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:42,667 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:03:42,667 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [998385015] [2021-11-13 18:03:42,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:42,668 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:42,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:03:42,669 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:03:42,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-13 18:03:42,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:42,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-13 18:03:42,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:03:43,273 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-13 18:03:43,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:03:43,568 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-13 18:03:43,569 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:03:43,569 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634631490] [2021-11-13 18:03:43,569 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:03:43,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998385015] [2021-11-13 18:03:43,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998385015] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:03:43,571 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:03:43,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-11-13 18:03:43,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287610750] [2021-11-13 18:03:43,574 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:03:43,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 18:03:43,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:03:43,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 18:03:43,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:03:43,577 INFO L87 Difference]: Start difference. First operand 176 states and 206 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 6 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-13 18:03:43,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:03:43,874 INFO L93 Difference]: Finished difference Result 225 states and 271 transitions. [2021-11-13 18:03:43,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-13 18:03:43,875 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 6 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 46 [2021-11-13 18:03:43,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:03:43,877 INFO L225 Difference]: With dead ends: 225 [2021-11-13 18:03:43,877 INFO L226 Difference]: Without dead ends: 217 [2021-11-13 18:03:43,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-11-13 18:03:43,879 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 44 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 157.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.83ms SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 191.87ms IncrementalHoareTripleChecker+Time [2021-11-13 18:03:43,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 255 Invalid, 163 Unknown, 0 Unchecked, 3.83ms Time], IncrementalHoareTripleChecker [28 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 191.87ms Time] [2021-11-13 18:03:43,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-11-13 18:03:43,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 202. [2021-11-13 18:03:43,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 135 states have (on average 1.1703703703703703) internal successors, (158), 141 states have internal predecessors, (158), 41 states have call successors, (41), 25 states have call predecessors, (41), 25 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-11-13 18:03:43,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 236 transitions. [2021-11-13 18:03:43,904 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 236 transitions. Word has length 46 [2021-11-13 18:03:43,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:03:43,904 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 236 transitions. [2021-11-13 18:03:43,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 6 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-13 18:03:43,905 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 236 transitions. [2021-11-13 18:03:43,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-13 18:03:43,907 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:03:43,907 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:03:43,945 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-13 18:03:44,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:44,131 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:03:44,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:03:44,132 INFO L85 PathProgramCache]: Analyzing trace with hash 98519191, now seen corresponding path program 1 times [2021-11-13 18:03:44,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:03:44,132 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383943140] [2021-11-13 18:03:44,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:44,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:03:44,142 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:03:44,143 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [611655122] [2021-11-13 18:03:44,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:03:44,143 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:03:44,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:03:44,144 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:03:44,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-13 18:03:44,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:03:44,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-13 18:03:44,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:03:45,165 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 36 proven. 10 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-13 18:03:45,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:04:09,397 WARN L227 SmtUtils]: Spent 13.70s on a formula simplification that was a NOOP. DAG size: 49 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:05:46,264 WARN L227 SmtUtils]: Spent 28.22s on a formula simplification that was a NOOP. DAG size: 50 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:07:15,648 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 36 proven. 10 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-13 18:07:15,649 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:07:15,649 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383943140] [2021-11-13 18:07:15,649 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:07:15,649 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611655122] [2021-11-13 18:07:15,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611655122] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:07:15,649 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:07:15,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2021-11-13 18:07:15,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102853532] [2021-11-13 18:07:15,650 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:07:15,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-13 18:07:15,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:07:15,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-13 18:07:15,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-11-13 18:07:15,652 INFO L87 Difference]: Start difference. First operand 202 states and 236 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 16 states have internal predecessors, (40), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 8 states have call predecessors, (16), 6 states have call successors, (16) [2021-11-13 18:07:32,193 WARN L227 SmtUtils]: Spent 14.34s on a formula simplification. DAG size of input: 51 DAG size of output: 24 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:07:36,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:07:36,219 INFO L93 Difference]: Finished difference Result 246 states and 294 transitions. [2021-11-13 18:07:36,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-13 18:07:36,220 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 16 states have internal predecessors, (40), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 8 states have call predecessors, (16), 6 states have call successors, (16) Word has length 60 [2021-11-13 18:07:36,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:07:36,222 INFO L225 Difference]: With dead ends: 246 [2021-11-13 18:07:36,222 INFO L226 Difference]: Without dead ends: 240 [2021-11-13 18:07:36,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 60.6s TimeCoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2021-11-13 18:07:36,224 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 87 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 301 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4153.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.33ms SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4214.29ms IncrementalHoareTripleChecker+Time [2021-11-13 18:07:36,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 211 Invalid, 432 Unknown, 0 Unchecked, 5.33ms Time], IncrementalHoareTripleChecker [131 Valid, 301 Invalid, 0 Unknown, 0 Unchecked, 4214.29ms Time] [2021-11-13 18:07:36,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-11-13 18:07:36,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 228. [2021-11-13 18:07:36,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 156 states have (on average 1.1794871794871795) internal successors, (184), 161 states have internal predecessors, (184), 45 states have call successors, (45), 27 states have call predecessors, (45), 26 states have return successors, (42), 39 states have call predecessors, (42), 42 states have call successors, (42) [2021-11-13 18:07:36,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 271 transitions. [2021-11-13 18:07:36,250 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 271 transitions. Word has length 60 [2021-11-13 18:07:36,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:07:36,250 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 271 transitions. [2021-11-13 18:07:36,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 16 states have internal predecessors, (40), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 8 states have call predecessors, (16), 6 states have call successors, (16) [2021-11-13 18:07:36,251 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 271 transitions. [2021-11-13 18:07:36,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-13 18:07:36,252 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:07:36,253 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:07:36,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-13 18:07:36,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-13 18:07:36,474 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:07:36,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:07:36,475 INFO L85 PathProgramCache]: Analyzing trace with hash -902942769, now seen corresponding path program 1 times [2021-11-13 18:07:36,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:07:36,475 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058859541] [2021-11-13 18:07:36,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:07:36,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:07:36,492 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:07:36,499 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1962197781] [2021-11-13 18:07:36,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:07:36,500 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:07:36,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:07:36,501 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:07:36,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-13 18:07:36,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:07:36,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-13 18:07:36,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:07:38,625 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 45 proven. 34 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-13 18:07:38,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:08:00,161 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:08:00,161 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058859541] [2021-11-13 18:08:00,161 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:08:00,161 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962197781] [2021-11-13 18:08:00,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962197781] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:08:00,161 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:08:00,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-11-13 18:08:00,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392960674] [2021-11-13 18:08:00,161 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:08:00,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 18:08:00,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:08:00,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 18:08:00,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2021-11-13 18:08:00,162 INFO L87 Difference]: Start difference. First operand 228 states and 271 transitions. Second operand has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-11-13 18:08:02,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:08:02,341 INFO L93 Difference]: Finished difference Result 233 states and 275 transitions. [2021-11-13 18:08:02,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-13 18:08:02,342 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) Word has length 71 [2021-11-13 18:08:02,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:08:02,344 INFO L225 Difference]: With dead ends: 233 [2021-11-13 18:08:02,344 INFO L226 Difference]: Without dead ends: 209 [2021-11-13 18:08:02,345 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2021-11-13 18:08:02,345 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 19 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 628.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.63ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 674.24ms IncrementalHoareTripleChecker+Time [2021-11-13 18:08:02,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 263 Invalid, 313 Unknown, 0 Unchecked, 3.63ms Time], IncrementalHoareTripleChecker [16 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 674.24ms Time] [2021-11-13 18:08:02,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-13 18:08:02,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2021-11-13 18:08:02,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 143 states have (on average 1.1888111888111887) internal successors, (170), 148 states have internal predecessors, (170), 41 states have call successors, (41), 25 states have call predecessors, (41), 24 states have return successors, (38), 35 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-13 18:08:02,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 249 transitions. [2021-11-13 18:08:02,370 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 249 transitions. Word has length 71 [2021-11-13 18:08:02,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:08:02,370 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 249 transitions. [2021-11-13 18:08:02,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-11-13 18:08:02,371 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 249 transitions. [2021-11-13 18:08:02,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-13 18:08:02,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:08:02,375 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:08:02,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-13 18:08:02,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-13 18:08:02,592 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:08:02,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:08:02,592 INFO L85 PathProgramCache]: Analyzing trace with hash -2111904302, now seen corresponding path program 1 times [2021-11-13 18:08:02,593 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:08:02,593 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086273308] [2021-11-13 18:08:02,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:08:02,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:08:02,608 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:08:02,608 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1264660273] [2021-11-13 18:08:02,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:08:02,609 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:08:02,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:08:02,610 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:08:02,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-13 18:08:02,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:08:02,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-13 18:08:02,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:08:02,900 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 40 proven. 0 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-13 18:08:02,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:08:02,901 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:08:02,901 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086273308] [2021-11-13 18:08:02,901 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:08:02,902 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264660273] [2021-11-13 18:08:02,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1264660273] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:08:02,902 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:08:02,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 18:08:02,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756647656] [2021-11-13 18:08:02,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:08:02,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:08:02,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:08:02,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:08:02,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:08:02,904 INFO L87 Difference]: Start difference. First operand 209 states and 249 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-13 18:08:03,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:08:03,019 INFO L93 Difference]: Finished difference Result 222 states and 265 transitions. [2021-11-13 18:08:03,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:08:03,020 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 75 [2021-11-13 18:08:03,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:08:03,021 INFO L225 Difference]: With dead ends: 222 [2021-11-13 18:08:03,022 INFO L226 Difference]: Without dead ends: 212 [2021-11-13 18:08:03,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:08:03,023 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 16 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 86.06ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.03ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 98.10ms IncrementalHoareTripleChecker+Time [2021-11-13 18:08:03,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 135 Invalid, 43 Unknown, 0 Unchecked, 1.03ms Time], IncrementalHoareTripleChecker [7 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 98.10ms Time] [2021-11-13 18:08:03,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-13 18:08:03,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 208. [2021-11-13 18:08:03,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 143 states have (on average 1.1538461538461537) internal successors, (165), 146 states have internal predecessors, (165), 40 states have call successors, (40), 24 states have call predecessors, (40), 24 states have return successors, (38), 37 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-13 18:08:03,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 243 transitions. [2021-11-13 18:08:03,045 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 243 transitions. Word has length 75 [2021-11-13 18:08:03,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:08:03,047 INFO L470 AbstractCegarLoop]: Abstraction has 208 states and 243 transitions. [2021-11-13 18:08:03,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-13 18:08:03,047 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 243 transitions. [2021-11-13 18:08:03,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-13 18:08:03,048 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:08:03,049 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:08:03,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-13 18:08:03,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-13 18:08:03,264 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:08:03,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:08:03,264 INFO L85 PathProgramCache]: Analyzing trace with hash -1315137972, now seen corresponding path program 2 times [2021-11-13 18:08:03,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:08:03,264 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815717814] [2021-11-13 18:08:03,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:08:03,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:08:03,289 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:08:03,290 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1063288257] [2021-11-13 18:08:03,290 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:08:03,290 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:08:03,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:08:03,295 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:08:03,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-13 18:08:03,390 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:08:03,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:08:03,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-13 18:08:03,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:08:04,524 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 40 proven. 52 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-13 18:08:04,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:08:32,284 WARN L227 SmtUtils]: Spent 6.90s on a formula simplification that was a NOOP. DAG size: 132 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:09:23,129 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 40 proven. 52 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-13 18:09:23,129 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:09:23,129 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815717814] [2021-11-13 18:09:23,129 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:09:23,129 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063288257] [2021-11-13 18:09:23,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063288257] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:09:23,129 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:09:23,130 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 24 [2021-11-13 18:09:23,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394359986] [2021-11-13 18:09:23,130 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:09:23,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 18:09:23,131 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:09:23,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 18:09:23,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=444, Unknown=1, NotChecked=0, Total=552 [2021-11-13 18:09:23,132 INFO L87 Difference]: Start difference. First operand 208 states and 243 transitions. Second operand has 24 states, 24 states have (on average 2.25) internal successors, (54), 22 states have internal predecessors, (54), 12 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (26), 11 states have call predecessors, (26), 10 states have call successors, (26) [2021-11-13 18:10:24,256 WARN L227 SmtUtils]: Spent 57.69s on a formula simplification. DAG size of input: 178 DAG size of output: 92 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:10:26,677 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:11:03,391 WARN L227 SmtUtils]: Spent 31.26s on a formula simplification. DAG size of input: 57 DAG size of output: 54 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:11:22,912 WARN L227 SmtUtils]: Spent 16.73s on a formula simplification. DAG size of input: 76 DAG size of output: 64 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:11:30,523 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:11:41,029 WARN L227 SmtUtils]: Spent 8.89s on a formula simplification. DAG size of input: 64 DAG size of output: 45 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:11:46,161 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:11:52,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:11:52,605 INFO L93 Difference]: Finished difference Result 300 states and 366 transitions. [2021-11-13 18:11:52,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-13 18:11:52,605 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.25) internal successors, (54), 22 states have internal predecessors, (54), 12 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (26), 11 states have call predecessors, (26), 10 states have call successors, (26) Word has length 92 [2021-11-13 18:11:52,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:11:52,607 INFO L225 Difference]: With dead ends: 300 [2021-11-13 18:11:52,607 INFO L226 Difference]: Without dead ends: 244 [2021-11-13 18:11:52,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 147.6s TimeCoverageRelationStatistics Valid=251, Invalid=937, Unknown=2, NotChecked=0, Total=1190 [2021-11-13 18:11:52,609 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 146 mSDsluCounter, 480 mSDsCounter, 0 mSdLazyCounter, 795 mSolverCounterSat, 250 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21427.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 531 SdHoareTripleChecker+Invalid, 1046 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.46ms SdHoareTripleChecker+Time, 250 IncrementalHoareTripleChecker+Valid, 795 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21623.79ms IncrementalHoareTripleChecker+Time [2021-11-13 18:11:52,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 531 Invalid, 1046 Unknown, 0 Unchecked, 11.46ms Time], IncrementalHoareTripleChecker [250 Valid, 795 Invalid, 1 Unknown, 0 Unchecked, 21623.79ms Time] [2021-11-13 18:11:52,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-13 18:11:52,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 214. [2021-11-13 18:11:52,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 147 states have (on average 1.1428571428571428) internal successors, (168), 151 states have internal predecessors, (168), 39 states have call successors, (39), 27 states have call predecessors, (39), 27 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-11-13 18:11:52,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 244 transitions. [2021-11-13 18:11:52,642 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 244 transitions. Word has length 92 [2021-11-13 18:11:52,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:11:52,642 INFO L470 AbstractCegarLoop]: Abstraction has 214 states and 244 transitions. [2021-11-13 18:11:52,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.25) internal successors, (54), 22 states have internal predecessors, (54), 12 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (26), 11 states have call predecessors, (26), 10 states have call successors, (26) [2021-11-13 18:11:52,643 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 244 transitions. [2021-11-13 18:11:52,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-13 18:11:52,644 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:11:52,644 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:11:52,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-13 18:11:52,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-13 18:11:52,852 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:11:52,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:11:52,852 INFO L85 PathProgramCache]: Analyzing trace with hash 2115368915, now seen corresponding path program 3 times [2021-11-13 18:11:52,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:11:52,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001421474] [2021-11-13 18:11:52,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:11:52,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:11:52,861 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:11:52,861 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1765739238] [2021-11-13 18:11:52,862 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 18:11:52,862 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:11:52,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:11:52,873 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:11:52,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-13 18:11:53,048 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-13 18:11:53,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:11:53,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-13 18:11:53,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:11:53,552 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 65 proven. 67 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2021-11-13 18:11:53,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:12:08,327 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:12:08,327 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001421474] [2021-11-13 18:12:08,327 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:12:08,328 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765739238] [2021-11-13 18:12:08,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1765739238] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:12:08,328 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:12:08,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-13 18:12:08,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353692543] [2021-11-13 18:12:08,328 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:12:08,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-13 18:12:08,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:12:08,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-13 18:12:08,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-11-13 18:12:08,329 INFO L87 Difference]: Start difference. First operand 214 states and 244 transitions. Second operand has 12 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 11 states have internal predecessors, (32), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-13 18:12:09,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:12:09,756 INFO L93 Difference]: Finished difference Result 244 states and 283 transitions. [2021-11-13 18:12:09,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-13 18:12:09,757 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 11 states have internal predecessors, (32), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 97 [2021-11-13 18:12:09,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:12:09,759 INFO L225 Difference]: With dead ends: 244 [2021-11-13 18:12:09,759 INFO L226 Difference]: Without dead ends: 222 [2021-11-13 18:12:09,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=107, Invalid=445, Unknown=0, NotChecked=0, Total=552 [2021-11-13 18:12:09,760 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 61 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 351.60ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.90ms SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 396.22ms IncrementalHoareTripleChecker+Time [2021-11-13 18:12:09,760 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 268 Invalid, 369 Unknown, 0 Unchecked, 2.90ms Time], IncrementalHoareTripleChecker [55 Valid, 314 Invalid, 0 Unknown, 0 Unchecked, 396.22ms Time] [2021-11-13 18:12:09,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-11-13 18:12:09,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 221. [2021-11-13 18:12:09,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 151 states have (on average 1.1390728476821192) internal successors, (172), 155 states have internal predecessors, (172), 41 states have call successors, (41), 28 states have call predecessors, (41), 28 states have return successors, (39), 37 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-13 18:12:09,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 252 transitions. [2021-11-13 18:12:09,805 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 252 transitions. Word has length 97 [2021-11-13 18:12:09,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:12:09,805 INFO L470 AbstractCegarLoop]: Abstraction has 221 states and 252 transitions. [2021-11-13 18:12:09,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 11 states have internal predecessors, (32), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-13 18:12:09,806 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 252 transitions. [2021-11-13 18:12:09,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-13 18:12:09,808 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:12:09,809 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:12:09,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-13 18:12:10,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-13 18:12:10,036 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:12:10,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:12:10,036 INFO L85 PathProgramCache]: Analyzing trace with hash 57999976, now seen corresponding path program 1 times [2021-11-13 18:12:10,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:12:10,036 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320316168] [2021-11-13 18:12:10,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:12:10,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:12:10,044 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:12:10,044 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [866432758] [2021-11-13 18:12:10,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:12:10,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:12:10,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:12:10,052 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:12:10,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-13 18:12:10,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:12:10,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-13 18:12:10,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:12:10,323 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 120 proven. 260 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-13 18:12:10,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:12:10,593 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 28 proven. 44 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2021-11-13 18:12:10,593 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:12:10,593 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320316168] [2021-11-13 18:12:10,593 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:12:10,593 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866432758] [2021-11-13 18:12:10,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [866432758] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:12:10,594 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:12:10,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-11-13 18:12:10,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871671533] [2021-11-13 18:12:10,594 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:12:10,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 18:12:10,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:12:10,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 18:12:10,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-11-13 18:12:10,596 INFO L87 Difference]: Start difference. First operand 221 states and 252 transitions. Second operand has 14 states, 14 states have (on average 4.357142857142857) internal successors, (61), 14 states have internal predecessors, (61), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2021-11-13 18:12:11,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:12:11,196 INFO L93 Difference]: Finished difference Result 583 states and 710 transitions. [2021-11-13 18:12:11,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 18:12:11,197 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.357142857142857) internal successors, (61), 14 states have internal predecessors, (61), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) Word has length 98 [2021-11-13 18:12:11,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:12:11,201 INFO L225 Difference]: With dead ends: 583 [2021-11-13 18:12:11,201 INFO L226 Difference]: Without dead ends: 515 [2021-11-13 18:12:11,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2021-11-13 18:12:11,204 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 238 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 385.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.70ms SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 457.43ms IncrementalHoareTripleChecker+Time [2021-11-13 18:12:11,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 268 Invalid, 303 Unknown, 0 Unchecked, 3.70ms Time], IncrementalHoareTripleChecker [138 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 457.43ms Time] [2021-11-13 18:12:11,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2021-11-13 18:12:11,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 453. [2021-11-13 18:12:11,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 303 states have (on average 1.1848184818481848) internal successors, (359), 319 states have internal predecessors, (359), 94 states have call successors, (94), 56 states have call predecessors, (94), 55 states have return successors, (87), 77 states have call predecessors, (87), 87 states have call successors, (87) [2021-11-13 18:12:11,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 540 transitions. [2021-11-13 18:12:11,287 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 540 transitions. Word has length 98 [2021-11-13 18:12:11,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:12:11,288 INFO L470 AbstractCegarLoop]: Abstraction has 453 states and 540 transitions. [2021-11-13 18:12:11,288 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.357142857142857) internal successors, (61), 14 states have internal predecessors, (61), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2021-11-13 18:12:11,288 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 540 transitions. [2021-11-13 18:12:11,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-13 18:12:11,290 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:12:11,290 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:12:11,321 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-13 18:12:11,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-13 18:12:11,508 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:12:11,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:12:11,508 INFO L85 PathProgramCache]: Analyzing trace with hash 900247290, now seen corresponding path program 2 times [2021-11-13 18:12:11,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:12:11,509 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524234034] [2021-11-13 18:12:11,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:12:11,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:12:11,528 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:12:11,529 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1562780340] [2021-11-13 18:12:11,529 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:12:11,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:12:11,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:12:11,530 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:12:11,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-13 18:12:11,607 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:12:11,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:12:11,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-13 18:12:11,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:12:20,237 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 102 proven. 70 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-11-13 18:12:20,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:12:21,065 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 110 proven. 2 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2021-11-13 18:12:21,065 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:12:21,065 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524234034] [2021-11-13 18:12:21,065 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:12:21,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562780340] [2021-11-13 18:12:21,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1562780340] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:12:21,066 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:12:21,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9] total 21 [2021-11-13 18:12:21,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127355741] [2021-11-13 18:12:21,066 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:12:21,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-13 18:12:21,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:12:21,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-13 18:12:21,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-11-13 18:12:21,068 INFO L87 Difference]: Start difference. First operand 453 states and 540 transitions. Second operand has 21 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 11 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 10 states have call predecessors, (22), 9 states have call successors, (22) [2021-11-13 18:12:22,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:12:22,723 INFO L93 Difference]: Finished difference Result 474 states and 562 transitions. [2021-11-13 18:12:22,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-13 18:12:22,723 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 11 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 10 states have call predecessors, (22), 9 states have call successors, (22) Word has length 103 [2021-11-13 18:12:22,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:12:22,727 INFO L225 Difference]: With dead ends: 474 [2021-11-13 18:12:22,727 INFO L226 Difference]: Without dead ends: 413 [2021-11-13 18:12:22,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 184 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2021-11-13 18:12:22,728 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 55 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 466 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1464.07ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.56ms SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1545.67ms IncrementalHoareTripleChecker+Time [2021-11-13 18:12:22,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 331 Invalid, 532 Unknown, 0 Unchecked, 3.56ms Time], IncrementalHoareTripleChecker [66 Valid, 466 Invalid, 0 Unknown, 0 Unchecked, 1545.67ms Time] [2021-11-13 18:12:22,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2021-11-13 18:12:22,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 406. [2021-11-13 18:12:22,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 271 states have (on average 1.1808118081180812) internal successors, (320), 288 states have internal predecessors, (320), 84 states have call successors, (84), 50 states have call predecessors, (84), 50 states have return successors, (81), 67 states have call predecessors, (81), 81 states have call successors, (81) [2021-11-13 18:12:22,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 485 transitions. [2021-11-13 18:12:22,812 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 485 transitions. Word has length 103 [2021-11-13 18:12:22,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:12:22,812 INFO L470 AbstractCegarLoop]: Abstraction has 406 states and 485 transitions. [2021-11-13 18:12:22,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 11 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 10 states have call predecessors, (22), 9 states have call successors, (22) [2021-11-13 18:12:22,813 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 485 transitions. [2021-11-13 18:12:22,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-13 18:12:22,814 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:12:22,814 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:12:22,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-13 18:12:23,031 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-13 18:12:23,032 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:12:23,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:12:23,032 INFO L85 PathProgramCache]: Analyzing trace with hash -353318641, now seen corresponding path program 1 times [2021-11-13 18:12:23,032 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:12:23,033 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958924677] [2021-11-13 18:12:23,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:12:23,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:12:23,055 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:12:23,056 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1437103788] [2021-11-13 18:12:23,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:12:23,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:12:23,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:12:23,058 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:12:23,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-13 18:12:23,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:12:23,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-13 18:12:23,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:12:23,438 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 32 proven. 470 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-13 18:12:23,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:12:23,784 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 32 proven. 46 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-11-13 18:12:23,784 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:12:23,784 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958924677] [2021-11-13 18:12:23,784 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:12:23,784 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437103788] [2021-11-13 18:12:23,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437103788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:12:23,784 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:12:23,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2021-11-13 18:12:23,785 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453375557] [2021-11-13 18:12:23,785 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:12:23,785 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-13 18:12:23,786 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:12:23,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-13 18:12:23,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2021-11-13 18:12:23,786 INFO L87 Difference]: Start difference. First operand 406 states and 485 transitions. Second operand has 18 states, 18 states have (on average 4.222222222222222) internal successors, (76), 18 states have internal predecessors, (76), 13 states have call successors, (33), 8 states have call predecessors, (33), 7 states have return successors, (32), 12 states have call predecessors, (32), 12 states have call successors, (32) [2021-11-13 18:12:24,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:12:24,694 INFO L93 Difference]: Finished difference Result 781 states and 958 transitions. [2021-11-13 18:12:24,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-13 18:12:24,695 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.222222222222222) internal successors, (76), 18 states have internal predecessors, (76), 13 states have call successors, (33), 8 states have call predecessors, (33), 7 states have return successors, (32), 12 states have call predecessors, (32), 12 states have call successors, (32) Word has length 110 [2021-11-13 18:12:24,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:12:24,700 INFO L225 Difference]: With dead ends: 781 [2021-11-13 18:12:24,700 INFO L226 Difference]: Without dead ends: 761 [2021-11-13 18:12:24,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=236, Invalid=466, Unknown=0, NotChecked=0, Total=702 [2021-11-13 18:12:24,702 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 241 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 611.64ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.46ms SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 689.27ms IncrementalHoareTripleChecker+Time [2021-11-13 18:12:24,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 376 Invalid, 391 Unknown, 0 Unchecked, 4.46ms Time], IncrementalHoareTripleChecker [144 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 689.27ms Time] [2021-11-13 18:12:24,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 761 states. [2021-11-13 18:12:24,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 761 to 746. [2021-11-13 18:12:24,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 746 states, 511 states have (on average 1.1291585127201567) internal successors, (577), 536 states have internal predecessors, (577), 148 states have call successors, (148), 86 states have call predecessors, (148), 86 states have return successors, (147), 123 states have call predecessors, (147), 147 states have call successors, (147) [2021-11-13 18:12:24,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 746 states to 746 states and 872 transitions. [2021-11-13 18:12:24,825 INFO L78 Accepts]: Start accepts. Automaton has 746 states and 872 transitions. Word has length 110 [2021-11-13 18:12:24,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:12:24,826 INFO L470 AbstractCegarLoop]: Abstraction has 746 states and 872 transitions. [2021-11-13 18:12:24,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.222222222222222) internal successors, (76), 18 states have internal predecessors, (76), 13 states have call successors, (33), 8 states have call predecessors, (33), 7 states have return successors, (32), 12 states have call predecessors, (32), 12 states have call successors, (32) [2021-11-13 18:12:24,826 INFO L276 IsEmpty]: Start isEmpty. Operand 746 states and 872 transitions. [2021-11-13 18:12:24,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-13 18:12:24,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:12:24,828 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:12:24,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-13 18:12:25,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:12:25,048 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:12:25,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:12:25,048 INFO L85 PathProgramCache]: Analyzing trace with hash 71111063, now seen corresponding path program 1 times [2021-11-13 18:12:25,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:12:25,048 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615757116] [2021-11-13 18:12:25,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:12:25,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:12:25,055 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:12:25,061 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1230487959] [2021-11-13 18:12:25,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:12:25,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:12:25,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:12:25,062 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:12:25,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-13 18:12:25,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:12:25,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 18:12:25,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:12:25,461 INFO L134 CoverageAnalysis]: Checked inductivity of 560 backedges. 167 proven. 0 refuted. 0 times theorem prover too weak. 393 trivial. 0 not checked. [2021-11-13 18:12:25,462 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:12:25,462 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:12:25,462 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615757116] [2021-11-13 18:12:25,462 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:12:25,462 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230487959] [2021-11-13 18:12:25,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230487959] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:12:25,462 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:12:25,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 18:12:25,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521888423] [2021-11-13 18:12:25,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:12:25,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:12:25,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:12:25,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:12:25,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:12:25,464 INFO L87 Difference]: Start difference. First operand 746 states and 872 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-13 18:12:25,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:12:25,631 INFO L93 Difference]: Finished difference Result 996 states and 1151 transitions. [2021-11-13 18:12:25,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:12:25,632 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 110 [2021-11-13 18:12:25,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:12:25,637 INFO L225 Difference]: With dead ends: 996 [2021-11-13 18:12:25,638 INFO L226 Difference]: Without dead ends: 697 [2021-11-13 18:12:25,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:12:25,640 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 8 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 44.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.83ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 56.33ms IncrementalHoareTripleChecker+Time [2021-11-13 18:12:25,641 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 125 Invalid, 41 Unknown, 0 Unchecked, 0.83ms Time], IncrementalHoareTripleChecker [4 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 56.33ms Time] [2021-11-13 18:12:25,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2021-11-13 18:12:25,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 693. [2021-11-13 18:12:25,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 693 states, 481 states have (on average 1.1101871101871101) internal successors, (534), 498 states have internal predecessors, (534), 125 states have call successors, (125), 86 states have call predecessors, (125), 86 states have return successors, (124), 108 states have call predecessors, (124), 124 states have call successors, (124) [2021-11-13 18:12:25,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 693 states to 693 states and 783 transitions. [2021-11-13 18:12:25,770 INFO L78 Accepts]: Start accepts. Automaton has 693 states and 783 transitions. Word has length 110 [2021-11-13 18:12:25,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:12:25,773 INFO L470 AbstractCegarLoop]: Abstraction has 693 states and 783 transitions. [2021-11-13 18:12:25,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-13 18:12:25,774 INFO L276 IsEmpty]: Start isEmpty. Operand 693 states and 783 transitions. [2021-11-13 18:12:25,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-13 18:12:25,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:12:25,775 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:12:25,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-13 18:12:25,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:12:25,996 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:12:25,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:12:25,996 INFO L85 PathProgramCache]: Analyzing trace with hash 802368810, now seen corresponding path program 4 times [2021-11-13 18:12:25,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:12:25,996 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558257457] [2021-11-13 18:12:25,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:12:25,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:12:26,014 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:12:26,014 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [849428098] [2021-11-13 18:12:26,014 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 18:12:26,014 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:12:26,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:12:26,018 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:12:26,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-13 18:12:26,099 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 18:12:26,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:12:26,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-13 18:12:26,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:12:26,808 INFO L134 CoverageAnalysis]: Checked inductivity of 628 backedges. 78 proven. 54 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2021-11-13 18:12:26,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:12:36,208 WARN L227 SmtUtils]: Spent 5.60s on a formula simplification. DAG size of input: 30 DAG size of output: 14 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:12:43,123 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:12:43,123 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558257457] [2021-11-13 18:12:43,123 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:12:43,123 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849428098] [2021-11-13 18:12:43,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849428098] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:12:43,124 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:12:43,124 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-11-13 18:12:43,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630839046] [2021-11-13 18:12:43,124 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:12:43,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 18:12:43,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:12:43,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 18:12:43,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-11-13 18:12:43,125 INFO L87 Difference]: Start difference. First operand 693 states and 783 transitions. Second operand has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-13 18:12:43,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:12:43,944 INFO L93 Difference]: Finished difference Result 817 states and 929 transitions. [2021-11-13 18:12:43,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-13 18:12:43,945 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) Word has length 115 [2021-11-13 18:12:43,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:12:43,953 INFO L225 Difference]: With dead ends: 817 [2021-11-13 18:12:43,953 INFO L226 Difference]: Without dead ends: 697 [2021-11-13 18:12:43,954 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 123 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-11-13 18:12:43,955 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 17 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 541 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 436.09ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.15ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 513.09ms IncrementalHoareTripleChecker+Time [2021-11-13 18:12:43,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 467 Invalid, 555 Unknown, 0 Unchecked, 4.15ms Time], IncrementalHoareTripleChecker [14 Valid, 541 Invalid, 0 Unknown, 0 Unchecked, 513.09ms Time] [2021-11-13 18:12:43,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2021-11-13 18:12:44,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 697. [2021-11-13 18:12:44,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 697 states, 484 states have (on average 1.1053719008264462) internal successors, (535), 501 states have internal predecessors, (535), 125 states have call successors, (125), 87 states have call predecessors, (125), 87 states have return successors, (123), 108 states have call predecessors, (123), 123 states have call successors, (123) [2021-11-13 18:12:44,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 697 states to 697 states and 783 transitions. [2021-11-13 18:12:44,078 INFO L78 Accepts]: Start accepts. Automaton has 697 states and 783 transitions. Word has length 115 [2021-11-13 18:12:44,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:12:44,078 INFO L470 AbstractCegarLoop]: Abstraction has 697 states and 783 transitions. [2021-11-13 18:12:44,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-13 18:12:44,079 INFO L276 IsEmpty]: Start isEmpty. Operand 697 states and 783 transitions. [2021-11-13 18:12:44,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-13 18:12:44,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:12:44,082 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:12:44,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-13 18:12:44,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-13 18:12:44,296 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:12:44,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:12:44,296 INFO L85 PathProgramCache]: Analyzing trace with hash 488955713, now seen corresponding path program 5 times [2021-11-13 18:12:44,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:12:44,296 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186140577] [2021-11-13 18:12:44,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:12:44,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:12:44,303 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:12:44,308 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1918048449] [2021-11-13 18:12:44,308 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 18:12:44,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:12:44,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:12:44,310 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:12:44,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a0ea5b5-c45c-483f-ba78-19371474f023/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-13 18:12:44,533 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-13 18:12:44,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:12:44,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-13 18:12:44,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:12:46,493 INFO L134 CoverageAnalysis]: Checked inductivity of 711 backedges. 191 proven. 139 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2021-11-13 18:12:46,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:15:25,398 WARN L227 SmtUtils]: Spent 1.64m on a formula simplification. DAG size of input: 104 DAG size of output: 88 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)