./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7004d2b01bb7d5c4b1956f589017b61646e33c2f2be997467596b458e0de6322 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-4e7fbc6 [2022-11-23 14:48:04,454 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:48:04,457 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:48:04,484 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:48:04,485 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:48:04,486 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:48:04,488 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:48:04,490 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:48:04,492 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:48:04,493 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:48:04,494 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:48:04,495 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:48:04,496 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:48:04,497 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:48:04,499 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:48:04,500 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:48:04,501 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:48:04,502 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:48:04,504 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:48:04,506 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:48:04,508 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:48:04,509 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:48:04,511 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:48:04,512 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:48:04,516 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:48:04,517 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:48:04,517 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:48:04,518 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:48:04,519 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:48:04,520 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:48:04,520 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:48:04,521 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:48:04,522 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:48:04,523 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:48:04,524 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:48:04,524 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:48:04,525 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:48:04,526 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:48:04,526 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:48:04,527 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:48:04,528 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:48:04,529 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:48:04,554 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:48:04,555 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:48:04,555 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:48:04,556 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:48:04,556 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:48:04,557 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:48:04,557 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:48:04,557 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:48:04,558 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:48:04,558 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:48:04,558 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:48:04,558 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:48:04,559 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:48:04,559 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:48:04,559 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:48:04,560 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:48:04,560 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:48:04,560 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:48:04,561 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:48:04,561 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:48:04,562 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:48:04,562 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:48:04,562 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:48:04,562 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:48:04,563 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:48:04,563 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:48:04,563 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:48:04,563 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:48:04,564 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:48:04,564 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:48:04,564 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:48:04,564 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:48:04,565 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:48:04,565 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:48:04,565 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:48:04,565 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:48:04,566 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:48:04,566 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:48:04,566 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:48:04,566 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:48:04,567 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:48:04,567 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_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7004d2b01bb7d5c4b1956f589017b61646e33c2f2be997467596b458e0de6322 [2022-11-23 14:48:04,924 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:48:04,967 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:48:04,974 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:48:04,976 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:48:04,977 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:48:04,978 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c [2022-11-23 14:48:08,486 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:48:08,784 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:48:08,784 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c [2022-11-23 14:48:08,795 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/data/5754f77fb/68d87f90593b474d978b657143e0babe/FLAG7ff0b33d4 [2022-11-23 14:48:08,824 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/data/5754f77fb/68d87f90593b474d978b657143e0babe [2022-11-23 14:48:08,830 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:48:08,833 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:48:08,839 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:48:08,839 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:48:08,843 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:48:08,844 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:48:08" (1/1) ... [2022-11-23 14:48:08,845 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22c1b107 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:08, skipping insertion in model container [2022-11-23 14:48:08,846 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:48:08" (1/1) ... [2022-11-23 14:48:08,855 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:48:08,885 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:48:09,113 WARN L237 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_989e9610-4036-45b6-b841-9cde5fe60174/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c[490,503] [2022-11-23 14:48:09,140 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:48:09,154 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:48:09,165 WARN L237 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_989e9610-4036-45b6-b841-9cde5fe60174/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c[490,503] [2022-11-23 14:48:09,177 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:48:09,193 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:48:09,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09 WrapperNode [2022-11-23 14:48:09,194 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:48:09,195 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:48:09,196 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:48:09,196 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:48:09,205 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,213 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,250 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 91 [2022-11-23 14:48:09,250 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:48:09,251 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:48:09,251 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:48:09,251 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:48:09,264 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,266 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,283 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,283 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,287 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,292 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,293 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,294 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,296 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:48:09,297 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:48:09,297 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:48:09,297 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:48:09,298 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (1/1) ... [2022-11-23 14:48:09,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:48:09,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:09,352 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:48:09,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:48:09,401 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:48:09,402 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-23 14:48:09,402 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-23 14:48:09,402 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:48:09,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:48:09,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:48:09,403 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 14:48:09,403 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 14:48:09,483 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:48:09,486 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:48:09,681 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:48:09,731 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:48:09,731 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-23 14:48:09,740 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:48:09 BoogieIcfgContainer [2022-11-23 14:48:09,740 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:48:09,743 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:48:09,744 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:48:09,759 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:48:09,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:48:08" (1/3) ... [2022-11-23 14:48:09,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@160c2e80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:48:09, skipping insertion in model container [2022-11-23 14:48:09,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:09" (2/3) ... [2022-11-23 14:48:09,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@160c2e80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:48:09, skipping insertion in model container [2022-11-23 14:48:09,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:48:09" (3/3) ... [2022-11-23 14:48:09,776 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound20.c [2022-11-23 14:48:09,807 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:48:09,819 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:48:09,931 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:48:09,949 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@26d3427e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:48:09,950 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:48:09,956 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-23 14:48:09,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-23 14:48:09,969 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:09,970 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:09,973 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:09,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:09,984 INFO L85 PathProgramCache]: Analyzing trace with hash 1826888722, now seen corresponding path program 1 times [2022-11-23 14:48:09,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:09,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630382260] [2022-11-23 14:48:09,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:09,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:10,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:10,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:10,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630382260] [2022-11-23 14:48:10,224 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 14:48:10,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691394732] [2022-11-23 14:48:10,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:10,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:10,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:10,235 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:10,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:48:10,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:10,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-23 14:48:10,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:10,421 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:48:10,422 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:48:10,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691394732] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:10,424 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:48:10,424 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:48:10,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44934479] [2022-11-23 14:48:10,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:10,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-23 14:48:10,435 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:10,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-23 14:48:10,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:48:10,494 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 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 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 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) [2022-11-23 14:48:10,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:10,569 INFO L93 Difference]: Finished difference Result 54 states and 86 transitions. [2022-11-23 14:48:10,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-23 14:48:10,573 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 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 13 [2022-11-23 14:48:10,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:10,584 INFO L225 Difference]: With dead ends: 54 [2022-11-23 14:48:10,584 INFO L226 Difference]: Without dead ends: 28 [2022-11-23 14:48:10,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:48:10,593 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:10,595 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:48:10,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-23 14:48:10,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-23 14:48:10,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 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) [2022-11-23 14:48:10,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-11-23 14:48:10,644 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 13 [2022-11-23 14:48:10,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:10,646 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-11-23 14:48:10,646 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 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) [2022-11-23 14:48:10,647 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-11-23 14:48:10,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-23 14:48:10,648 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:10,649 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:10,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:10,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-23 14:48:10,850 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:10,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:10,851 INFO L85 PathProgramCache]: Analyzing trace with hash -828509657, now seen corresponding path program 1 times [2022-11-23 14:48:10,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:10,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71695494] [2022-11-23 14:48:10,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:10,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:10,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:10,896 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:10,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71695494] [2022-11-23 14:48:10,896 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 14:48:10,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658610522] [2022-11-23 14:48:10,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:10,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:10,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:10,899 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:10,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:48:11,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:11,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-23 14:48:11,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:11,143 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:48:11,144 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:48:11,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658610522] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:11,144 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:48:11,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:48:11,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690508958] [2022-11-23 14:48:11,145 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:11,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:48:11,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:11,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:48:11,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:48:11,148 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 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) [2022-11-23 14:48:11,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:11,180 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2022-11-23 14:48:11,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:48:11,181 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 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 14 [2022-11-23 14:48:11,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:11,182 INFO L225 Difference]: With dead ends: 37 [2022-11-23 14:48:11,183 INFO L226 Difference]: Without dead ends: 30 [2022-11-23 14:48:11,183 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:48:11,185 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:11,185 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 94 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:48:11,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-23 14:48:11,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-23 14:48:11,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 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) [2022-11-23 14:48:11,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2022-11-23 14:48:11,195 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 14 [2022-11-23 14:48:11,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:11,195 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2022-11-23 14:48:11,196 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 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) [2022-11-23 14:48:11,196 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2022-11-23 14:48:11,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 14:48:11,197 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:11,197 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:11,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:11,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:11,404 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:11,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:11,405 INFO L85 PathProgramCache]: Analyzing trace with hash 66369279, now seen corresponding path program 1 times [2022-11-23 14:48:11,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:11,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434463607] [2022-11-23 14:48:11,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:11,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:11,428 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:11,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1722723254] [2022-11-23 14:48:11,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:11,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:11,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:11,431 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:11,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:48:11,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:11,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-23 14:48:11,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:11,551 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:48:11,551 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:48:11,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:11,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434463607] [2022-11-23 14:48:11,552 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:11,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1722723254] [2022-11-23 14:48:11,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1722723254] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:11,553 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:48:11,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:48:11,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345623450] [2022-11-23 14:48:11,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:11,554 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:48:11,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:11,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:48:11,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:48:11,556 INFO L87 Difference]: Start difference. First operand 30 states and 40 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:48:11,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:11,660 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2022-11-23 14:48:11,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:48:11,661 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2022-11-23 14:48:11,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:11,662 INFO L225 Difference]: With dead ends: 50 [2022-11-23 14:48:11,662 INFO L226 Difference]: Without dead ends: 43 [2022-11-23 14:48:11,663 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:48:11,665 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 45 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:11,665 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 88 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:48:11,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-23 14:48:11,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2022-11-23 14:48:11,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 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) [2022-11-23 14:48:11,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2022-11-23 14:48:11,680 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 15 [2022-11-23 14:48:11,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:11,681 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2022-11-23 14:48:11,681 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:48:11,682 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2022-11-23 14:48:11,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-23 14:48:11,682 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:11,683 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:11,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:11,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:11,892 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:11,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:11,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1737104877, now seen corresponding path program 1 times [2022-11-23 14:48:11,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:11,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440085460] [2022-11-23 14:48:11,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:11,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:11,936 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:11,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [772869557] [2022-11-23 14:48:11,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:11,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:11,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:11,952 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:11,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:48:12,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:12,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-23 14:48:12,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:12,128 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:48:12,128 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:48:12,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:12,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440085460] [2022-11-23 14:48:12,130 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:12,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772869557] [2022-11-23 14:48:12,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772869557] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:12,131 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:48:12,131 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 14:48:12,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097534059] [2022-11-23 14:48:12,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:12,133 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:48:12,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:12,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:48:12,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:48:12,137 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 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) [2022-11-23 14:48:12,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:12,202 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2022-11-23 14:48:12,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:48:12,204 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 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 [2022-11-23 14:48:12,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:12,205 INFO L225 Difference]: With dead ends: 55 [2022-11-23 14:48:12,205 INFO L226 Difference]: Without dead ends: 33 [2022-11-23 14:48:12,206 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:48:12,207 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:12,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 119 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:48:12,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-23 14:48:12,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-23 14:48:12,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 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) [2022-11-23 14:48:12,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-11-23 14:48:12,217 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 20 [2022-11-23 14:48:12,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:12,218 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-11-23 14:48:12,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 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) [2022-11-23 14:48:12,218 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-11-23 14:48:12,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-23 14:48:12,219 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:12,220 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:12,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:12,426 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:12,426 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:12,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:12,427 INFO L85 PathProgramCache]: Analyzing trace with hash 148941760, now seen corresponding path program 1 times [2022-11-23 14:48:12,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:12,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224759992] [2022-11-23 14:48:12,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:12,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:12,449 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:12,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1569106179] [2022-11-23 14:48:12,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:12,450 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:12,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:12,451 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:12,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:48:12,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:12,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 14:48:12,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:12,878 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:48:12,878 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:48:12,879 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:12,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224759992] [2022-11-23 14:48:12,879 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:12,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569106179] [2022-11-23 14:48:12,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569106179] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:12,881 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:48:12,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-23 14:48:12,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877841939] [2022-11-23 14:48:12,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:12,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 14:48:12,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:12,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 14:48:12,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-23 14:48:12,883 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:48:13,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:13,028 INFO L93 Difference]: Finished difference Result 51 states and 68 transitions. [2022-11-23 14:48:13,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 14:48:13,029 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2022-11-23 14:48:13,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:13,032 INFO L225 Difference]: With dead ends: 51 [2022-11-23 14:48:13,032 INFO L226 Difference]: Without dead ends: 49 [2022-11-23 14:48:13,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-11-23 14:48:13,038 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 71 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:13,044 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 131 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:48:13,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-23 14:48:13,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2022-11-23 14:48:13,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 34 states have internal predecessors, (44), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 14:48:13,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2022-11-23 14:48:13,060 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 20 [2022-11-23 14:48:13,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:13,060 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2022-11-23 14:48:13,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:48:13,061 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2022-11-23 14:48:13,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-23 14:48:13,062 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:13,062 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:13,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:13,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:13,268 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:13,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:13,269 INFO L85 PathProgramCache]: Analyzing trace with hash -1894324762, now seen corresponding path program 1 times [2022-11-23 14:48:13,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:13,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576882731] [2022-11-23 14:48:13,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:13,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:13,287 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:13,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [618248808] [2022-11-23 14:48:13,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:13,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:13,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:13,289 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:13,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:48:13,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:13,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-23 14:48:13,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:13,417 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:48:13,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:13,520 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:48:13,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:13,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576882731] [2022-11-23 14:48:13,521 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:13,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618248808] [2022-11-23 14:48:13,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618248808] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:13,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1527993502] [2022-11-23 14:48:13,546 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 14:48:13,546 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:13,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:13,558 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:13,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:14,654 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:48:14,706 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:18,184 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1527993502] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:18,185 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:48:18,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 6] total 22 [2022-11-23 14:48:18,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507161350] [2022-11-23 14:48:18,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:18,186 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 14:48:18,186 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:18,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 14:48:18,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:48:18,189 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:48:20,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:20,252 INFO L93 Difference]: Finished difference Result 88 states and 125 transitions. [2022-11-23 14:48:20,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-23 14:48:20,253 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2022-11-23 14:48:20,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:20,255 INFO L225 Difference]: With dead ends: 88 [2022-11-23 14:48:20,255 INFO L226 Difference]: Without dead ends: 66 [2022-11-23 14:48:20,256 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=176, Invalid=580, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:48:20,257 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 18 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:20,257 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 145 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 14:48:20,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-23 14:48:20,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 56. [2022-11-23 14:48:20,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 42 states have internal predecessors, (54), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 14:48:20,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 75 transitions. [2022-11-23 14:48:20,280 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 75 transitions. Word has length 21 [2022-11-23 14:48:20,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:20,280 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 75 transitions. [2022-11-23 14:48:20,281 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:48:20,281 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 75 transitions. [2022-11-23 14:48:20,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-23 14:48:20,282 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:20,282 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:20,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:20,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:20,499 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:20,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:20,499 INFO L85 PathProgramCache]: Analyzing trace with hash -1377591568, now seen corresponding path program 1 times [2022-11-23 14:48:20,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:20,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232125746] [2022-11-23 14:48:20,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:20,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:20,515 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:20,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [818059283] [2022-11-23 14:48:20,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:20,522 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:20,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:20,523 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:20,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:48:20,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:20,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-23 14:48:20,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:21,079 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:48:21,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:21,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:21,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232125746] [2022-11-23 14:48:21,519 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:21,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818059283] [2022-11-23 14:48:21,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818059283] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:48:21,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [734138489] [2022-11-23 14:48:21,522 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-23 14:48:21,523 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:21,523 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:21,523 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:21,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:21,860 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-23 14:48:21,872 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:48:21,907 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:24,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [734138489] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:24,778 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:48:24,778 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [13] total 29 [2022-11-23 14:48:24,778 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828227500] [2022-11-23 14:48:24,778 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:24,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-23 14:48:24,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:24,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-23 14:48:24,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:48:24,780 INFO L87 Difference]: Start difference. First operand 56 states and 75 transitions. Second operand has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 14:48:25,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:25,280 INFO L93 Difference]: Finished difference Result 110 states and 150 transitions. [2022-11-23 14:48:25,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 14:48:25,281 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 25 [2022-11-23 14:48:25,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:25,283 INFO L225 Difference]: With dead ends: 110 [2022-11-23 14:48:25,283 INFO L226 Difference]: Without dead ends: 73 [2022-11-23 14:48:25,288 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:48:25,289 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 9 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:25,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 123 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:48:25,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-23 14:48:25,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2022-11-23 14:48:25,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 49 states have (on average 1.2653061224489797) internal successors, (62), 51 states have internal predecessors, (62), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-23 14:48:25,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2022-11-23 14:48:25,339 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 25 [2022-11-23 14:48:25,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:25,339 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2022-11-23 14:48:25,340 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 14:48:25,340 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2022-11-23 14:48:25,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-23 14:48:25,345 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:25,345 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:25,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:25,551 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:25,551 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:25,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:25,552 INFO L85 PathProgramCache]: Analyzing trace with hash -1856138177, now seen corresponding path program 1 times [2022-11-23 14:48:25,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:25,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556337945] [2022-11-23 14:48:25,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:25,552 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:25,575 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:25,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1536520733] [2022-11-23 14:48:25,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:25,576 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:25,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:25,583 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:25,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:48:25,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:25,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-23 14:48:25,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:25,948 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:48:25,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:26,085 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:48:26,085 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:26,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556337945] [2022-11-23 14:48:26,085 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:26,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536520733] [2022-11-23 14:48:26,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536520733] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:26,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [493623986] [2022-11-23 14:48:26,088 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-23 14:48:26,089 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:26,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:26,089 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:26,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:26,965 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2022-11-23 14:48:26,984 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:48:27,014 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:32,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [493623986] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:32,904 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:48:32,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [9, 6] total 30 [2022-11-23 14:48:32,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463346136] [2022-11-23 14:48:32,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:32,905 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-23 14:48:32,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:32,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-23 14:48:32,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2022-11-23 14:48:32,907 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:48:36,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:36,507 INFO L93 Difference]: Finished difference Result 108 states and 145 transitions. [2022-11-23 14:48:36,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-23 14:48:36,508 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2022-11-23 14:48:36,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:36,510 INFO L225 Difference]: With dead ends: 108 [2022-11-23 14:48:36,510 INFO L226 Difference]: Without dead ends: 86 [2022-11-23 14:48:36,511 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=192, Invalid=1290, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 14:48:36,511 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 22 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:36,512 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 154 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-23 14:48:36,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-23 14:48:36,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 80. [2022-11-23 14:48:36,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 54 states have (on average 1.2407407407407407) internal successors, (67), 57 states have internal predecessors, (67), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-23 14:48:36,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 104 transitions. [2022-11-23 14:48:36,565 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 104 transitions. Word has length 27 [2022-11-23 14:48:36,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:36,566 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 104 transitions. [2022-11-23 14:48:36,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:48:36,567 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 104 transitions. [2022-11-23 14:48:36,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-23 14:48:36,577 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:36,577 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:36,588 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-23 14:48:36,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:36,785 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:36,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:36,785 INFO L85 PathProgramCache]: Analyzing trace with hash -301475410, now seen corresponding path program 1 times [2022-11-23 14:48:36,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:36,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753523761] [2022-11-23 14:48:36,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:36,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:36,806 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:36,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [666544157] [2022-11-23 14:48:36,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:36,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:36,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:36,809 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:36,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 14:48:36,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:36,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-23 14:48:36,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:36,999 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:48:37,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:37,109 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:48:37,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:37,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753523761] [2022-11-23 14:48:37,110 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:37,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666544157] [2022-11-23 14:48:37,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666544157] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:37,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [499422654] [2022-11-23 14:48:37,113 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:48:37,114 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:37,114 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:37,114 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:37,114 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:45,673 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-23 14:48:45,682 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:48:45,711 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:51,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [499422654] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:51,613 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:48:51,613 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [6, 7] total 29 [2022-11-23 14:48:51,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718962579] [2022-11-23 14:48:51,614 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:51,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-23 14:48:51,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:51,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-23 14:48:51,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=607, Unknown=0, NotChecked=0, Total=812 [2022-11-23 14:48:51,616 INFO L87 Difference]: Start difference. First operand 80 states and 104 transitions. Second operand has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-23 14:48:52,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:52,459 INFO L93 Difference]: Finished difference Result 138 states and 185 transitions. [2022-11-23 14:48:52,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-23 14:48:52,460 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2022-11-23 14:48:52,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:52,463 INFO L225 Difference]: With dead ends: 138 [2022-11-23 14:48:52,464 INFO L226 Difference]: Without dead ends: 101 [2022-11-23 14:48:52,464 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 100 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=216, Invalid=654, Unknown=0, NotChecked=0, Total=870 [2022-11-23 14:48:52,465 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 10 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:52,466 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 116 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 14:48:52,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-23 14:48:52,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 85. [2022-11-23 14:48:52,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 61 states have internal predecessors, (74), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-23 14:48:52,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 111 transitions. [2022-11-23 14:48:52,502 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 111 transitions. Word has length 47 [2022-11-23 14:48:52,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:52,502 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 111 transitions. [2022-11-23 14:48:52,503 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-23 14:48:52,503 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 111 transitions. [2022-11-23 14:48:52,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 14:48:52,505 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:52,506 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:52,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:52,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:52,712 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:52,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:52,712 INFO L85 PathProgramCache]: Analyzing trace with hash 170701079, now seen corresponding path program 1 times [2022-11-23 14:48:52,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:52,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93816278] [2022-11-23 14:48:52,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:52,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:52,741 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:52,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1093728399] [2022-11-23 14:48:52,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:52,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:52,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:52,743 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:52,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 14:48:52,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:52,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 14:48:52,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:52,893 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 14:48:52,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:53,012 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 14:48:53,012 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:53,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93816278] [2022-11-23 14:48:53,012 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:53,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093728399] [2022-11-23 14:48:53,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093728399] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:53,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1632336811] [2022-11-23 14:48:53,015 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-23 14:48:53,016 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:53,016 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:53,017 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:53,017 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:59,688 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2022-11-23 14:48:59,739 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:48:59,768 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:49:03,092 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3013#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:49:03,092 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:49:03,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:49:03,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-23 14:49:03,093 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398383948] [2022-11-23 14:49:03,093 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:49:03,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 14:49:03,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:03,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 14:49:03,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2022-11-23 14:49:03,094 INFO L87 Difference]: Start difference. First operand 85 states and 111 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 14:49:03,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:03,255 INFO L93 Difference]: Finished difference Result 105 states and 134 transitions. [2022-11-23 14:49:03,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:49:03,256 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 48 [2022-11-23 14:49:03,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:03,257 INFO L225 Difference]: With dead ends: 105 [2022-11-23 14:49:03,258 INFO L226 Difference]: Without dead ends: 103 [2022-11-23 14:49:03,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:49:03,259 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 26 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:03,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 84 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:49:03,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-23 14:49:03,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2022-11-23 14:49:03,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 71 states have (on average 1.2535211267605635) internal successors, (89), 74 states have internal predecessors, (89), 21 states have call successors, (21), 8 states have call predecessors, (21), 8 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-23 14:49:03,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 130 transitions. [2022-11-23 14:49:03,289 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 130 transitions. Word has length 48 [2022-11-23 14:49:03,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:03,290 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 130 transitions. [2022-11-23 14:49:03,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 14:49:03,290 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 130 transitions. [2022-11-23 14:49:03,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 14:49:03,291 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:03,292 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:03,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:03,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 14:49:03,503 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:49:03,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:03,503 INFO L85 PathProgramCache]: Analyzing trace with hash -339484245, now seen corresponding path program 1 times [2022-11-23 14:49:03,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:03,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786459913] [2022-11-23 14:49:03,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:03,504 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:03,514 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:49:03,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [407688380] [2022-11-23 14:49:03,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:03,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:03,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:03,516 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:03,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 14:49:03,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:03,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 14:49:03,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:03,675 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:49:03,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:03,810 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:49:03,810 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:03,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786459913] [2022-11-23 14:49:03,810 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:49:03,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407688380] [2022-11-23 14:49:03,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407688380] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:49:03,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1037630232] [2022-11-23 14:49:03,813 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:49:03,813 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:49:03,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:49:03,813 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:49:03,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:49:09,478 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:49:13,962 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:49:13,968 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:49:13,998 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:49:32,519 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3627#(and (<= ~counter~0 22) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:49:32,519 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:49:32,520 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:49:32,520 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-23 14:49:32,520 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094116658] [2022-11-23 14:49:32,520 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:49:32,520 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 14:49:32,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:32,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 14:49:32,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1106, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 14:49:32,522 INFO L87 Difference]: Start difference. First operand 101 states and 130 transitions. Second operand has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 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) [2022-11-23 14:49:33,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:33,084 INFO L93 Difference]: Finished difference Result 508 states and 648 transitions. [2022-11-23 14:49:33,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-23 14:49:33,084 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 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 48 [2022-11-23 14:49:33,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:33,094 INFO L225 Difference]: With dead ends: 508 [2022-11-23 14:49:33,094 INFO L226 Difference]: Without dead ends: 501 [2022-11-23 14:49:33,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=302, Invalid=1590, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 14:49:33,096 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 273 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:33,096 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [273 Valid, 392 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:49:33,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2022-11-23 14:49:33,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 390. [2022-11-23 14:49:33,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 274 states have (on average 1.27007299270073) internal successors, (348), 284 states have internal predecessors, (348), 81 states have call successors, (81), 34 states have call predecessors, (81), 34 states have return successors, (76), 71 states have call predecessors, (76), 76 states have call successors, (76) [2022-11-23 14:49:33,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 505 transitions. [2022-11-23 14:49:33,191 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 505 transitions. Word has length 48 [2022-11-23 14:49:33,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:33,192 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 505 transitions. [2022-11-23 14:49:33,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 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) [2022-11-23 14:49:33,192 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 505 transitions. [2022-11-23 14:49:33,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-23 14:49:33,194 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:33,194 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:33,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:33,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:33,404 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:49:33,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:33,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1953712133, now seen corresponding path program 1 times [2022-11-23 14:49:33,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:33,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109962570] [2022-11-23 14:49:33,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:33,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:33,417 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:49:33,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1644392158] [2022-11-23 14:49:33,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:33,418 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:33,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:33,420 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:33,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 14:49:33,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:33,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-23 14:49:33,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:34,515 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-23 14:49:34,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:35,863 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-23 14:49:35,863 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:35,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109962570] [2022-11-23 14:49:35,863 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:49:35,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644392158] [2022-11-23 14:49:35,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1644392158] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:49:35,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1255991436] [2022-11-23 14:49:35,866 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:49:35,866 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:49:35,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:49:35,867 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:49:35,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:49:42,474 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:49:46,357 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-23 14:49:46,362 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:49:46,389 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:50:13,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5255#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:50:13,471 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:50:13,471 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:50:13,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2022-11-23 14:50:13,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616579620] [2022-11-23 14:50:13,472 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:50:13,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 14:50:13,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:50:13,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 14:50:13,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=2014, Unknown=0, NotChecked=0, Total=2256 [2022-11-23 14:50:13,475 INFO L87 Difference]: Start difference. First operand 390 states and 505 transitions. Second operand has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-23 14:50:28,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:50:28,965 INFO L93 Difference]: Finished difference Result 845 states and 1155 transitions. [2022-11-23 14:50:28,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-23 14:50:28,966 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 49 [2022-11-23 14:50:28,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:50:28,971 INFO L225 Difference]: With dead ends: 845 [2022-11-23 14:50:28,971 INFO L226 Difference]: Without dead ends: 641 [2022-11-23 14:50:28,974 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 36.3s TimeCoverageRelationStatistics Valid=670, Invalid=5030, Unknown=0, NotChecked=0, Total=5700 [2022-11-23 14:50:28,974 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 301 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 1295 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 1543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 1295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:50:28,975 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [307 Valid, 459 Invalid, 1543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 1295 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2022-11-23 14:50:28,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2022-11-23 14:50:29,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 501. [2022-11-23 14:50:29,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 364 states have (on average 1.3104395604395604) internal successors, (477), 371 states have internal predecessors, (477), 101 states have call successors, (101), 35 states have call predecessors, (101), 35 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2022-11-23 14:50:29,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 676 transitions. [2022-11-23 14:50:29,141 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 676 transitions. Word has length 49 [2022-11-23 14:50:29,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:50:29,142 INFO L495 AbstractCegarLoop]: Abstraction has 501 states and 676 transitions. [2022-11-23 14:50:29,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-23 14:50:29,142 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 676 transitions. [2022-11-23 14:50:29,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-23 14:50:29,143 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:50:29,144 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:50:29,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 14:50:29,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:29,351 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:50:29,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:50:29,351 INFO L85 PathProgramCache]: Analyzing trace with hash -324758054, now seen corresponding path program 1 times [2022-11-23 14:50:29,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:50:29,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85383723] [2022-11-23 14:50:29,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:29,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:50:29,363 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:50:29,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [309557745] [2022-11-23 14:50:29,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:29,364 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:29,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:50:29,365 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:50:29,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 14:50:29,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:50:29,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 14:50:29,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:50:29,503 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-23 14:50:29,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:50:29,590 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-23 14:50:29,590 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:50:29,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85383723] [2022-11-23 14:50:29,590 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:50:29,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309557745] [2022-11-23 14:50:29,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [309557745] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:50:29,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1872663144] [2022-11-23 14:50:29,593 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-23 14:50:29,593 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:50:29,593 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:50:29,594 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:50:29,594 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:50:39,766 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:50:39,771 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:50:39,797 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:50:46,006 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7559#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:50:46,006 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:50:46,006 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:50:46,006 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-23 14:50:46,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230910655] [2022-11-23 14:50:46,006 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:50:46,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 14:50:46,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:50:46,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 14:50:46,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=872, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:50:46,008 INFO L87 Difference]: Start difference. First operand 501 states and 676 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:50:46,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:50:46,264 INFO L93 Difference]: Finished difference Result 533 states and 705 transitions. [2022-11-23 14:50:46,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:50:46,264 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 50 [2022-11-23 14:50:46,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:50:46,267 INFO L225 Difference]: With dead ends: 533 [2022-11-23 14:50:46,268 INFO L226 Difference]: Without dead ends: 531 [2022-11-23 14:50:46,269 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=136, Invalid=986, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 14:50:46,269 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 26 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:50:46,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 131 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:50:46,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2022-11-23 14:50:46,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 525. [2022-11-23 14:50:46,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 382 states have (on average 1.2958115183246073) internal successors, (495), 389 states have internal predecessors, (495), 101 states have call successors, (101), 41 states have call predecessors, (101), 41 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2022-11-23 14:50:46,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 694 transitions. [2022-11-23 14:50:46,426 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 694 transitions. Word has length 50 [2022-11-23 14:50:46,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:50:46,426 INFO L495 AbstractCegarLoop]: Abstraction has 525 states and 694 transitions. [2022-11-23 14:50:46,427 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:50:46,427 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 694 transitions. [2022-11-23 14:50:46,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-23 14:50:46,428 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:50:46,429 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:50:46,440 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-23 14:50:46,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-23 14:50:46,635 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:50:46,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:50:46,635 INFO L85 PathProgramCache]: Analyzing trace with hash -1947795252, now seen corresponding path program 1 times [2022-11-23 14:50:46,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:50:46,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124362945] [2022-11-23 14:50:46,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:46,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:50:46,646 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:50:46,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [96094260] [2022-11-23 14:50:46,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:46,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:46,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:50:46,649 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:50:46,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 14:50:46,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:50:46,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-23 14:50:46,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:50:46,784 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 14:50:46,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:50:46,886 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 14:50:46,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:50:46,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124362945] [2022-11-23 14:50:46,886 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:50:46,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96094260] [2022-11-23 14:50:46,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96094260] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:50:46,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2135887498] [2022-11-23 14:50:46,889 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:50:46,889 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:50:46,890 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:50:46,890 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:50:46,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:51:10,444 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2022-11-23 14:51:10,486 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:51:10,510 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:51:14,890 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9414#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:51:14,890 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:51:14,891 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:51:14,891 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-11-23 14:51:14,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536918641] [2022-11-23 14:51:14,891 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:51:14,892 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-23 14:51:14,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:51:14,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-23 14:51:14,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1063, Unknown=0, NotChecked=0, Total=1260 [2022-11-23 14:51:14,893 INFO L87 Difference]: Start difference. First operand 525 states and 694 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 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) [2022-11-23 14:51:15,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:51:15,371 INFO L93 Difference]: Finished difference Result 790 states and 1036 transitions. [2022-11-23 14:51:15,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 14:51:15,372 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 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 55 [2022-11-23 14:51:15,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:51:15,375 INFO L225 Difference]: With dead ends: 790 [2022-11-23 14:51:15,375 INFO L226 Difference]: Without dead ends: 528 [2022-11-23 14:51:15,377 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 602 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=239, Invalid=1401, Unknown=0, NotChecked=0, Total=1640 [2022-11-23 14:51:15,378 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 139 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:51:15,378 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 252 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:51:15,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2022-11-23 14:51:15,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 503. [2022-11-23 14:51:15,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 363 states have (on average 1.2506887052341598) internal successors, (454), 368 states have internal predecessors, (454), 98 states have call successors, (98), 41 states have call predecessors, (98), 41 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2022-11-23 14:51:15,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 648 transitions. [2022-11-23 14:51:15,597 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 648 transitions. Word has length 55 [2022-11-23 14:51:15,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:51:15,598 INFO L495 AbstractCegarLoop]: Abstraction has 503 states and 648 transitions. [2022-11-23 14:51:15,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 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) [2022-11-23 14:51:15,598 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 648 transitions. [2022-11-23 14:51:15,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-23 14:51:15,600 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:51:15,600 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:51:15,611 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 14:51:15,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-23 14:51:15,806 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:51:15,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:51:15,807 INFO L85 PathProgramCache]: Analyzing trace with hash -897475049, now seen corresponding path program 2 times [2022-11-23 14:51:15,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:51:15,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217288217] [2022-11-23 14:51:15,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:15,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:51:15,820 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:51:15,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1538374851] [2022-11-23 14:51:15,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:51:15,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:51:15,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:51:15,823 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:51:15,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 14:51:15,886 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:51:15,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:51:15,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-23 14:51:15,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:51:16,031 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2022-11-23 14:51:16,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:51:16,135 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-23 14:51:16,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:51:16,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217288217] [2022-11-23 14:51:16,136 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:51:16,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538374851] [2022-11-23 14:51:16,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538374851] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 14:51:16,136 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:51:16,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 12 [2022-11-23 14:51:16,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260552720] [2022-11-23 14:51:16,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:51:16,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:51:16,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:51:16,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:51:16,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-23 14:51:16,137 INFO L87 Difference]: Start difference. First operand 503 states and 648 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:51:16,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:51:16,358 INFO L93 Difference]: Finished difference Result 544 states and 686 transitions. [2022-11-23 14:51:16,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:51:16,358 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 58 [2022-11-23 14:51:16,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:51:16,361 INFO L225 Difference]: With dead ends: 544 [2022-11-23 14:51:16,362 INFO L226 Difference]: Without dead ends: 542 [2022-11-23 14:51:16,362 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-11-23 14:51:16,363 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 11 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:51:16,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 111 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:51:16,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2022-11-23 14:51:16,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 535. [2022-11-23 14:51:16,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 535 states, 387 states have (on average 1.2299741602067182) internal successors, (476), 392 states have internal predecessors, (476), 98 states have call successors, (98), 49 states have call predecessors, (98), 49 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2022-11-23 14:51:16,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 670 transitions. [2022-11-23 14:51:16,530 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 670 transitions. Word has length 58 [2022-11-23 14:51:16,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:51:16,531 INFO L495 AbstractCegarLoop]: Abstraction has 535 states and 670 transitions. [2022-11-23 14:51:16,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:51:16,531 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 670 transitions. [2022-11-23 14:51:16,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-23 14:51:16,533 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:51:16,533 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 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, 1, 1, 1] [2022-11-23 14:51:16,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 14:51:16,739 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:51:16,739 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:51:16,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:51:16,740 INFO L85 PathProgramCache]: Analyzing trace with hash 1281872666, now seen corresponding path program 2 times [2022-11-23 14:51:16,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:51:16,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541037818] [2022-11-23 14:51:16,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:16,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:51:16,750 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:51:16,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1886194125] [2022-11-23 14:51:16,750 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:51:16,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:51:16,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:51:16,752 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:51:16,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 14:51:16,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:51:16,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:51:16,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 14:51:16,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:51:16,980 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 14:51:16,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:51:17,079 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-23 14:51:17,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:51:17,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541037818] [2022-11-23 14:51:17,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:51:17,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886194125] [2022-11-23 14:51:17,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886194125] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 14:51:17,079 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:51:17,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2022-11-23 14:51:17,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758882060] [2022-11-23 14:51:17,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:51:17,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:51:17,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:51:17,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:51:17,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2022-11-23 14:51:17,081 INFO L87 Difference]: Start difference. First operand 535 states and 670 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:51:17,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:51:17,412 INFO L93 Difference]: Finished difference Result 613 states and 770 transitions. [2022-11-23 14:51:17,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:51:17,413 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 60 [2022-11-23 14:51:17,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:51:17,416 INFO L225 Difference]: With dead ends: 613 [2022-11-23 14:51:17,416 INFO L226 Difference]: Without dead ends: 611 [2022-11-23 14:51:17,417 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-23 14:51:17,417 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 8 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:51:17,418 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 109 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:51:17,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2022-11-23 14:51:17,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 602. [2022-11-23 14:51:17,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 428 states have (on average 1.2289719626168225) internal successors, (526), 434 states have internal predecessors, (526), 116 states have call successors, (116), 57 states have call predecessors, (116), 57 states have return successors, (114), 110 states have call predecessors, (114), 114 states have call successors, (114) [2022-11-23 14:51:17,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 756 transitions. [2022-11-23 14:51:17,679 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 756 transitions. Word has length 60 [2022-11-23 14:51:17,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:51:17,680 INFO L495 AbstractCegarLoop]: Abstraction has 602 states and 756 transitions. [2022-11-23 14:51:17,680 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:51:17,680 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 756 transitions. [2022-11-23 14:51:17,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-23 14:51:17,682 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:51:17,682 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:51:17,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 14:51:17,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 14:51:17,889 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:51:17,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:51:17,889 INFO L85 PathProgramCache]: Analyzing trace with hash 1844245864, now seen corresponding path program 1 times [2022-11-23 14:51:17,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:51:17,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302087418] [2022-11-23 14:51:17,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:17,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:51:17,913 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:51:17,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1653600531] [2022-11-23 14:51:17,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:17,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:51:17,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:51:17,925 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:51:17,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 14:51:17,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:51:17,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-23 14:51:18,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:51:18,092 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:51:18,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:51:18,222 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:51:18,222 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:51:18,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302087418] [2022-11-23 14:51:18,223 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:51:18,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1653600531] [2022-11-23 14:51:18,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1653600531] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:51:18,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [433025346] [2022-11-23 14:51:18,225 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:51:18,225 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:51:18,226 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:51:18,226 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:51:18,226 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:51:23,392 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:51:28,036 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:51:28,041 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:51:28,063 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:51:45,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15591#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:51:45,428 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:51:45,428 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:51:45,428 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2022-11-23 14:51:45,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686380178] [2022-11-23 14:51:45,428 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:51:45,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 14:51:45,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:51:45,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 14:51:45,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1151, Unknown=0, NotChecked=0, Total=1406 [2022-11-23 14:51:45,430 INFO L87 Difference]: Start difference. First operand 602 states and 756 transitions. Second operand has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 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) [2022-11-23 14:51:46,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:51:46,545 INFO L93 Difference]: Finished difference Result 1248 states and 1622 transitions. [2022-11-23 14:51:46,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-23 14:51:46,546 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 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 60 [2022-11-23 14:51:46,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:51:46,553 INFO L225 Difference]: With dead ends: 1248 [2022-11-23 14:51:46,554 INFO L226 Difference]: Without dead ends: 1097 [2022-11-23 14:51:46,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 827 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=368, Invalid=1794, Unknown=0, NotChecked=0, Total=2162 [2022-11-23 14:51:46,556 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 289 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:51:46,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 355 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:51:46,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1097 states. [2022-11-23 14:51:47,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1097 to 1030. [2022-11-23 14:51:47,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1030 states, 720 states have (on average 1.2166666666666666) internal successors, (876), 735 states have internal predecessors, (876), 219 states have call successors, (219), 90 states have call predecessors, (219), 90 states have return successors, (214), 204 states have call predecessors, (214), 214 states have call successors, (214) [2022-11-23 14:51:47,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1030 states to 1030 states and 1309 transitions. [2022-11-23 14:51:47,082 INFO L78 Accepts]: Start accepts. Automaton has 1030 states and 1309 transitions. Word has length 60 [2022-11-23 14:51:47,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:51:47,083 INFO L495 AbstractCegarLoop]: Abstraction has 1030 states and 1309 transitions. [2022-11-23 14:51:47,083 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 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) [2022-11-23 14:51:47,083 INFO L276 IsEmpty]: Start isEmpty. Operand 1030 states and 1309 transitions. [2022-11-23 14:51:47,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-23 14:51:47,087 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:51:47,088 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:51:47,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-23 14:51:47,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 14:51:47,300 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:51:47,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:51:47,301 INFO L85 PathProgramCache]: Analyzing trace with hash 186118403, now seen corresponding path program 1 times [2022-11-23 14:51:47,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:51:47,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038659536] [2022-11-23 14:51:47,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:47,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:51:47,309 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:51:47,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1880623789] [2022-11-23 14:51:47,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:47,310 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:51:47,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:51:47,311 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:51:47,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-23 14:51:47,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:51:47,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-23 14:51:47,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:51:48,548 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-23 14:51:48,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:51:49,198 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-23 14:51:49,199 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:51:49,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038659536] [2022-11-23 14:51:49,199 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:51:49,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880623789] [2022-11-23 14:51:49,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880623789] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:51:49,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2014372530] [2022-11-23 14:51:49,201 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:51:49,201 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:51:49,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:51:49,202 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:51:49,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:51:53,424 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2022-11-23 14:51:53,425 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:51:56,919 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:51:56,924 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:51:56,946 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:52:08,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19262#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:52:08,654 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:52:08,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:52:08,655 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 22 [2022-11-23 14:52:08,655 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982666046] [2022-11-23 14:52:08,655 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:52:08,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 14:52:08,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:52:08,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 14:52:08,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1780, Unknown=0, NotChecked=0, Total=1980 [2022-11-23 14:52:08,657 INFO L87 Difference]: Start difference. First operand 1030 states and 1309 transitions. Second operand has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-23 14:52:53,752 WARN L233 SmtUtils]: Spent 5.89s on a formula simplification. DAG size of input: 35 DAG size of output: 30 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:53:27,826 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:53:29,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:53:29,627 INFO L93 Difference]: Finished difference Result 1748 states and 2329 transitions. [2022-11-23 14:53:29,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-23 14:53:29,628 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 61 [2022-11-23 14:53:29,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:53:29,635 INFO L225 Difference]: With dead ends: 1748 [2022-11-23 14:53:29,636 INFO L226 Difference]: Without dead ends: 1420 [2022-11-23 14:53:29,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1908 ImplicationChecksByTransitivity, 66.9s TimeCoverageRelationStatistics Valid=703, Invalid=5777, Unknown=0, NotChecked=0, Total=6480 [2022-11-23 14:53:29,640 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 330 mSDsluCounter, 646 mSDsCounter, 0 mSdLazyCounter, 1447 mSolverCounterSat, 303 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 731 SdHoareTripleChecker+Invalid, 1750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 303 IncrementalHoareTripleChecker+Valid, 1447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:53:29,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [334 Valid, 731 Invalid, 1750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [303 Valid, 1447 Invalid, 0 Unknown, 0 Unchecked, 26.2s Time] [2022-11-23 14:53:29,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1420 states. [2022-11-23 14:53:30,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1420 to 1146. [2022-11-23 14:53:30,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1146 states, 813 states have (on average 1.2533825338253382) internal successors, (1019), 835 states have internal predecessors, (1019), 247 states have call successors, (247), 85 states have call predecessors, (247), 85 states have return successors, (242), 225 states have call predecessors, (242), 242 states have call successors, (242) [2022-11-23 14:53:30,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1146 states to 1146 states and 1508 transitions. [2022-11-23 14:53:30,245 INFO L78 Accepts]: Start accepts. Automaton has 1146 states and 1508 transitions. Word has length 61 [2022-11-23 14:53:30,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:53:30,246 INFO L495 AbstractCegarLoop]: Abstraction has 1146 states and 1508 transitions. [2022-11-23 14:53:30,246 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-23 14:53:30,246 INFO L276 IsEmpty]: Start isEmpty. Operand 1146 states and 1508 transitions. [2022-11-23 14:53:30,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-23 14:53:30,247 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:53:30,248 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:53:30,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-23 14:53:30,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:53:30,455 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:53:30,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:53:30,455 INFO L85 PathProgramCache]: Analyzing trace with hash 1039137595, now seen corresponding path program 2 times [2022-11-23 14:53:30,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:53:30,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208428806] [2022-11-23 14:53:30,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:53:30,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:53:30,474 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:53:30,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1602512688] [2022-11-23 14:53:30,475 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:53:30,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:53:30,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:53:30,476 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:53:30,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-23 14:53:30,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:53:30,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:53:30,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-23 14:53:30,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:53:30,607 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-23 14:53:30,607 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:53:30,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:53:30,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208428806] [2022-11-23 14:53:30,608 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:53:30,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602512688] [2022-11-23 14:53:30,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602512688] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:53:30,608 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:53:30,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:53:30,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636362217] [2022-11-23 14:53:30,609 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:53:30,609 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:53:30,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:53:30,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:53:30,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:53:30,610 INFO L87 Difference]: Start difference. First operand 1146 states and 1508 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-23 14:53:31,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:53:31,205 INFO L93 Difference]: Finished difference Result 1441 states and 1900 transitions. [2022-11-23 14:53:31,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:53:31,206 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 61 [2022-11-23 14:53:31,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:53:31,211 INFO L225 Difference]: With dead ends: 1441 [2022-11-23 14:53:31,212 INFO L226 Difference]: Without dead ends: 1209 [2022-11-23 14:53:31,213 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-23 14:53:31,214 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 30 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:53:31,215 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 137 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:53:31,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1209 states. [2022-11-23 14:53:31,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1209 to 1010. [2022-11-23 14:53:31,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1010 states, 719 states have (on average 1.228094575799722) internal successors, (883), 732 states have internal predecessors, (883), 205 states have call successors, (205), 85 states have call predecessors, (205), 85 states have return successors, (200), 192 states have call predecessors, (200), 200 states have call successors, (200) [2022-11-23 14:53:31,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1010 states to 1010 states and 1288 transitions. [2022-11-23 14:53:31,721 INFO L78 Accepts]: Start accepts. Automaton has 1010 states and 1288 transitions. Word has length 61 [2022-11-23 14:53:31,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:53:31,721 INFO L495 AbstractCegarLoop]: Abstraction has 1010 states and 1288 transitions. [2022-11-23 14:53:31,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-23 14:53:31,722 INFO L276 IsEmpty]: Start isEmpty. Operand 1010 states and 1288 transitions. [2022-11-23 14:53:31,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-23 14:53:31,724 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:53:31,724 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:53:31,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-23 14:53:31,930 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:53:31,930 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:53:31,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:53:31,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1945599548, now seen corresponding path program 3 times [2022-11-23 14:53:31,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:53:31,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227363572] [2022-11-23 14:53:31,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:53:31,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:53:31,938 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:53:31,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [440354127] [2022-11-23 14:53:31,939 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:53:31,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:53:31,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:53:31,942 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:53:31,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-23 14:53:32,006 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:53:32,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:53:32,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 14:53:32,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:53:32,058 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-23 14:53:32,058 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:53:32,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:53:32,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227363572] [2022-11-23 14:53:32,059 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:53:32,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [440354127] [2022-11-23 14:53:32,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [440354127] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:53:32,059 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:53:32,060 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:53:32,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077574363] [2022-11-23 14:53:32,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:53:32,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:53:32,061 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:53:32,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:53:32,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:53:32,062 INFO L87 Difference]: Start difference. First operand 1010 states and 1288 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-23 14:53:32,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:53:32,602 INFO L93 Difference]: Finished difference Result 1627 states and 2121 transitions. [2022-11-23 14:53:32,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:53:32,602 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 64 [2022-11-23 14:53:32,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:53:32,607 INFO L225 Difference]: With dead ends: 1627 [2022-11-23 14:53:32,608 INFO L226 Difference]: Without dead ends: 1176 [2022-11-23 14:53:32,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:53:32,610 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 12 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:53:32,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 96 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:53:32,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1176 states. [2022-11-23 14:53:33,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1176 to 1126. [2022-11-23 14:53:33,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 787 states have (on average 1.2325285895806861) internal successors, (970), 796 states have internal predecessors, (970), 253 states have call successors, (253), 85 states have call predecessors, (253), 85 states have return successors, (248), 244 states have call predecessors, (248), 248 states have call successors, (248) [2022-11-23 14:53:33,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 1471 transitions. [2022-11-23 14:53:33,212 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 1471 transitions. Word has length 64 [2022-11-23 14:53:33,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:53:33,212 INFO L495 AbstractCegarLoop]: Abstraction has 1126 states and 1471 transitions. [2022-11-23 14:53:33,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-23 14:53:33,213 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 1471 transitions. [2022-11-23 14:53:33,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-23 14:53:33,214 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:53:33,214 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:53:33,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-23 14:53:33,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:53:33,419 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:53:33,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:53:33,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1497093235, now seen corresponding path program 4 times [2022-11-23 14:53:33,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:53:33,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886181720] [2022-11-23 14:53:33,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:53:33,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:53:33,428 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:53:33,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1695067449] [2022-11-23 14:53:33,428 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:53:33,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:53:33,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:53:33,432 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:53:33,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-23 14:53:33,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:53:33,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-23 14:53:33,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:53:34,804 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-23 14:53:34,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:53:38,310 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 16 proven. 26 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-23 14:53:38,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:53:38,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886181720] [2022-11-23 14:53:38,310 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:53:38,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695067449] [2022-11-23 14:53:38,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695067449] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:53:38,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [714341205] [2022-11-23 14:53:38,312 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:53:38,312 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:53:38,313 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:53:38,313 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:53:38,313 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:53:43,714 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:53:46,885 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:53:46,890 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:53:46,913 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:54:11,741 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31792#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:54:11,741 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:54:11,741 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:54:11,742 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 28 [2022-11-23 14:54:11,742 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035786809] [2022-11-23 14:54:11,742 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:54:11,742 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-23 14:54:11,743 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:54:11,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-23 14:54:11,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=2173, Unknown=0, NotChecked=0, Total=2450 [2022-11-23 14:54:11,744 INFO L87 Difference]: Start difference. First operand 1126 states and 1471 transitions. Second operand has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-23 14:54:47,029 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:54:49,031 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:54:51,039 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:55:04,612 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.79s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:55:06,769 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.49s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:55:30,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:30,861 INFO L93 Difference]: Finished difference Result 1694 states and 2285 transitions. [2022-11-23 14:55:30,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-23 14:55:30,862 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) Word has length 66 [2022-11-23 14:55:30,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:30,869 INFO L225 Difference]: With dead ends: 1694 [2022-11-23 14:55:30,869 INFO L226 Difference]: Without dead ends: 1688 [2022-11-23 14:55:30,873 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 146 SyntacticMatches, 3 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2493 ImplicationChecksByTransitivity, 67.3s TimeCoverageRelationStatistics Valid=1107, Invalid=6549, Unknown=0, NotChecked=0, Total=7656 [2022-11-23 14:55:30,873 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 455 mSDsluCounter, 705 mSDsCounter, 0 mSdLazyCounter, 1426 mSolverCounterSat, 369 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 39.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 456 SdHoareTripleChecker+Valid, 801 SdHoareTripleChecker+Invalid, 1798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 369 IncrementalHoareTripleChecker+Valid, 1426 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 39.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:30,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [456 Valid, 801 Invalid, 1798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [369 Valid, 1426 Invalid, 3 Unknown, 0 Unchecked, 39.2s Time] [2022-11-23 14:55:30,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1688 states. [2022-11-23 14:55:31,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1688 to 1430. [2022-11-23 14:55:31,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1430 states, 1014 states have (on average 1.2504930966469427) internal successors, (1268), 1022 states have internal predecessors, (1268), 310 states have call successors, (310), 106 states have call predecessors, (310), 105 states have return successors, (306), 301 states have call predecessors, (306), 306 states have call successors, (306) [2022-11-23 14:55:31,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1430 states to 1430 states and 1884 transitions. [2022-11-23 14:55:31,564 INFO L78 Accepts]: Start accepts. Automaton has 1430 states and 1884 transitions. Word has length 66 [2022-11-23 14:55:31,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:31,564 INFO L495 AbstractCegarLoop]: Abstraction has 1430 states and 1884 transitions. [2022-11-23 14:55:31,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-23 14:55:31,564 INFO L276 IsEmpty]: Start isEmpty. Operand 1430 states and 1884 transitions. [2022-11-23 14:55:31,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-23 14:55:31,566 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:31,566 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:31,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:31,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:31,774 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:31,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:31,775 INFO L85 PathProgramCache]: Analyzing trace with hash 1524056252, now seen corresponding path program 1 times [2022-11-23 14:55:31,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:31,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549415692] [2022-11-23 14:55:31,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:31,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:31,785 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:55:31,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1059425083] [2022-11-23 14:55:31,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:31,786 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:31,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:31,799 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:31,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-23 14:55:31,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:31,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-23 14:55:31,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:32,072 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:55:32,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:32,299 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:55:32,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:32,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549415692] [2022-11-23 14:55:32,299 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:55:32,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059425083] [2022-11-23 14:55:32,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059425083] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:32,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1432415989] [2022-11-23 14:55:32,304 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:55:32,305 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:32,305 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:32,305 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:32,305 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:37,478 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2022-11-23 14:55:37,478 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:55:39,285 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:55:39,290 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:55:39,314 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:50,826 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36807#(and (<= ~counter~0 22) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:50,826 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:50,826 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:55:50,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-11-23 14:55:50,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939160815] [2022-11-23 14:55:50,826 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:50,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 14:55:50,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:50,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 14:55:50,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1673, Unknown=0, NotChecked=0, Total=2070 [2022-11-23 14:55:50,828 INFO L87 Difference]: Start difference. First operand 1430 states and 1884 transitions. Second operand has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 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) [2022-11-23 14:55:53,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:53,395 INFO L93 Difference]: Finished difference Result 3913 states and 5424 transitions. [2022-11-23 14:55:53,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-23 14:55:53,396 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 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 68 [2022-11-23 14:55:53,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:53,407 INFO L225 Difference]: With dead ends: 3913 [2022-11-23 14:55:53,408 INFO L226 Difference]: Without dead ends: 3390 [2022-11-23 14:55:53,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 157 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1336 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=674, Invalid=2986, Unknown=0, NotChecked=0, Total=3660 [2022-11-23 14:55:53,412 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 524 mSDsluCounter, 498 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 236 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 524 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 236 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:53,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [524 Valid, 590 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [236 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 14:55:53,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3390 states. [2022-11-23 14:55:55,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3390 to 3265. [2022-11-23 14:55:55,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3265 states, 2334 states have (on average 1.2609254498714653) internal successors, (2943), 2349 states have internal predecessors, (2943), 736 states have call successors, (736), 195 states have call predecessors, (736), 194 states have return successors, (726), 720 states have call predecessors, (726), 726 states have call successors, (726) [2022-11-23 14:55:55,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3265 states to 3265 states and 4405 transitions. [2022-11-23 14:55:55,191 INFO L78 Accepts]: Start accepts. Automaton has 3265 states and 4405 transitions. Word has length 68 [2022-11-23 14:55:55,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:55,191 INFO L495 AbstractCegarLoop]: Abstraction has 3265 states and 4405 transitions. [2022-11-23 14:55:55,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 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) [2022-11-23 14:55:55,191 INFO L276 IsEmpty]: Start isEmpty. Operand 3265 states and 4405 transitions. [2022-11-23 14:55:55,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-23 14:55:55,193 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:55,193 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 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, 1, 1] [2022-11-23 14:55:55,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:55,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:55,399 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:55,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:55,399 INFO L85 PathProgramCache]: Analyzing trace with hash 689077281, now seen corresponding path program 1 times [2022-11-23 14:55:55,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:55,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164127442] [2022-11-23 14:55:55,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:55,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:55,408 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:55:55,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [980586578] [2022-11-23 14:55:55,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:55,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:55,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:55,410 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:55,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-23 14:55:55,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:55,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-23 14:55:55,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:56,898 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 34 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-23 14:55:56,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:56:00,564 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 33 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2022-11-23 14:56:00,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:56:00,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164127442] [2022-11-23 14:56:00,564 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:56:00,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980586578] [2022-11-23 14:56:00,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980586578] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:56:00,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [68664531] [2022-11-23 14:56:00,566 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:56:00,566 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:56:00,566 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:56:00,567 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:56:00,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:56:38,965 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2022-11-23 14:56:39,008 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:56:39,033 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:56:46,254 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47701#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-23 14:56:46,254 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:56:46,254 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:56:46,255 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2022-11-23 14:56:46,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542654258] [2022-11-23 14:56:46,255 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:56:46,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-23 14:56:46,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:56:46,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-23 14:56:46,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2398, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 14:56:46,256 INFO L87 Difference]: Start difference. First operand 3265 states and 4405 transitions. Second operand has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-23 14:57:22,423 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:57:59,901 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:58:22,805 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:58:33,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:33,723 INFO L93 Difference]: Finished difference Result 5368 states and 7465 transitions. [2022-11-23 14:58:33,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-11-23 14:58:33,724 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 79 [2022-11-23 14:58:33,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:33,744 INFO L225 Difference]: With dead ends: 5368 [2022-11-23 14:58:33,744 INFO L226 Difference]: Without dead ends: 5317 [2022-11-23 14:58:33,751 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 167 SyntacticMatches, 18 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7652 ImplicationChecksByTransitivity, 75.0s TimeCoverageRelationStatistics Valid=2799, Invalid=15833, Unknown=0, NotChecked=0, Total=18632 [2022-11-23 14:58:33,751 INFO L413 NwaCegarLoop]: 97 mSDtfsCounter, 650 mSDsluCounter, 1059 mSDsCounter, 0 mSdLazyCounter, 2697 mSolverCounterSat, 709 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 36.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 650 SdHoareTripleChecker+Valid, 1156 SdHoareTripleChecker+Invalid, 3408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 709 IncrementalHoareTripleChecker+Valid, 2697 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 36.9s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:33,752 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [650 Valid, 1156 Invalid, 3408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [709 Valid, 2697 Invalid, 2 Unknown, 0 Unchecked, 36.9s Time] [2022-11-23 14:58:33,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5317 states. [2022-11-23 14:58:37,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5317 to 4128. [2022-11-23 14:58:37,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4128 states, 3001 states have (on average 1.279573475508164) internal successors, (3840), 3014 states have internal predecessors, (3840), 902 states have call successors, (902), 225 states have call predecessors, (902), 224 states have return successors, (892), 888 states have call predecessors, (892), 892 states have call successors, (892) [2022-11-23 14:58:37,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4128 states to 4128 states and 5634 transitions. [2022-11-23 14:58:37,425 INFO L78 Accepts]: Start accepts. Automaton has 4128 states and 5634 transitions. Word has length 79 [2022-11-23 14:58:37,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:37,426 INFO L495 AbstractCegarLoop]: Abstraction has 4128 states and 5634 transitions. [2022-11-23 14:58:37,426 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-23 14:58:37,426 INFO L276 IsEmpty]: Start isEmpty. Operand 4128 states and 5634 transitions. [2022-11-23 14:58:37,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-11-23 14:58:37,428 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:37,428 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:58:37,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-23 14:58:37,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:37,635 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:37,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:37,635 INFO L85 PathProgramCache]: Analyzing trace with hash 1576694894, now seen corresponding path program 2 times [2022-11-23 14:58:37,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:37,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132239695] [2022-11-23 14:58:37,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:37,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:37,645 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:58:37,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [113063268] [2022-11-23 14:58:37,645 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:58:37,645 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:37,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:37,647 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:37,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-23 14:58:37,732 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 14:58:37,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:58:37,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-23 14:58:37,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:58:37,942 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 120 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-23 14:58:37,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:58:38,236 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 56 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-23 14:58:38,236 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:58:38,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132239695] [2022-11-23 14:58:38,236 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:58:38,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113063268] [2022-11-23 14:58:38,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113063268] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:58:38,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [258034167] [2022-11-23 14:58:38,238 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:58:38,238 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:58:38,239 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:58:38,239 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:58:38,239 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:58:40,862 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2022-11-23 14:58:40,862 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:58:44,308 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:58:44,313 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:58:44,339 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:58:54,053 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62188#(and (<= ~counter~0 22) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:58:54,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:58:54,053 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:58:54,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2022-11-23 14:58:54,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778811530] [2022-11-23 14:58:54,053 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:58:54,054 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-23 14:58:54,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:58:54,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-23 14:58:54,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=1802, Unknown=0, NotChecked=0, Total=2256 [2022-11-23 14:58:54,055 INFO L87 Difference]: Start difference. First operand 4128 states and 5634 transitions. Second operand has 24 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 24 states have internal predecessors, (92), 6 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-11-23 14:58:59,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:59,748 INFO L93 Difference]: Finished difference Result 5419 states and 7456 transitions. [2022-11-23 14:58:59,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-23 14:58:59,748 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 24 states have internal predecessors, (92), 6 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) Word has length 89 [2022-11-23 14:58:59,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:59,764 INFO L225 Difference]: With dead ends: 5419 [2022-11-23 14:58:59,765 INFO L226 Difference]: Without dead ends: 5377 [2022-11-23 14:58:59,767 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 215 SyntacticMatches, 4 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1519 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=806, Invalid=3354, Unknown=0, NotChecked=0, Total=4160 [2022-11-23 14:58:59,768 INFO L413 NwaCegarLoop]: 106 mSDtfsCounter, 717 mSDsluCounter, 527 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 377 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 717 SdHoareTripleChecker+Valid, 633 SdHoareTripleChecker+Invalid, 741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 377 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:59,768 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [717 Valid, 633 Invalid, 741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [377 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 14:58:59,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5377 states. [2022-11-23 14:59:03,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5377 to 5158. [2022-11-23 14:59:03,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5158 states, 3778 states have (on average 1.2501323451561672) internal successors, (4723), 3823 states have internal predecessors, (4723), 1122 states have call successors, (1122), 258 states have call predecessors, (1122), 257 states have return successors, (1110), 1076 states have call predecessors, (1110), 1110 states have call successors, (1110) [2022-11-23 14:59:03,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5158 states to 5158 states and 6955 transitions. [2022-11-23 14:59:03,763 INFO L78 Accepts]: Start accepts. Automaton has 5158 states and 6955 transitions. Word has length 89 [2022-11-23 14:59:03,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:03,764 INFO L495 AbstractCegarLoop]: Abstraction has 5158 states and 6955 transitions. [2022-11-23 14:59:03,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 24 states have internal predecessors, (92), 6 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-11-23 14:59:03,764 INFO L276 IsEmpty]: Start isEmpty. Operand 5158 states and 6955 transitions. [2022-11-23 14:59:03,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-23 14:59:03,766 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:03,766 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:03,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:03,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-23 14:59:03,972 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:03,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:03,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1613266328, now seen corresponding path program 2 times [2022-11-23 14:59:03,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:03,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081315647] [2022-11-23 14:59:03,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:03,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:03,980 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:59:03,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [412545737] [2022-11-23 14:59:03,981 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:59:03,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:03,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:03,983 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:03,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-23 14:59:04,046 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:59:04,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:04,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 14:59:04,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:04,112 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-11-23 14:59:04,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:04,199 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-11-23 14:59:04,199 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:04,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081315647] [2022-11-23 14:59:04,199 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:59:04,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412545737] [2022-11-23 14:59:04,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [412545737] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:04,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [976837300] [2022-11-23 14:59:04,201 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:59:04,201 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:04,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:04,202 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:04,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:07,584 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:59:11,254 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 14:59:11,261 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:59:11,282 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:30,444 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '77991#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:59:30,444 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:30,444 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:59:30,445 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-11-23 14:59:30,445 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161871099] [2022-11-23 14:59:30,445 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:30,445 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 14:59:30,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:30,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 14:59:30,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2022-11-23 14:59:30,446 INFO L87 Difference]: Start difference. First operand 5158 states and 6955 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-23 14:59:36,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:36,725 INFO L93 Difference]: Finished difference Result 6867 states and 9553 transitions. [2022-11-23 14:59:36,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 14:59:36,725 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 90 [2022-11-23 14:59:36,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:36,755 INFO L225 Difference]: With dead ends: 6867 [2022-11-23 14:59:36,756 INFO L226 Difference]: Without dead ends: 6815 [2022-11-23 14:59:36,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 237 SyntacticMatches, 10 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=223, Invalid=1669, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 14:59:36,759 INFO L413 NwaCegarLoop]: 99 mSDtfsCounter, 122 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:36,760 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 362 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:59:36,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6815 states. [2022-11-23 14:59:40,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6815 to 5044. [2022-11-23 14:59:40,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5044 states, 3629 states have (on average 1.2554422705979609) internal successors, (4556), 3680 states have internal predecessors, (4556), 1157 states have call successors, (1157), 258 states have call predecessors, (1157), 257 states have return successors, (1145), 1105 states have call predecessors, (1145), 1145 states have call successors, (1145) [2022-11-23 14:59:40,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5044 states to 5044 states and 6858 transitions. [2022-11-23 14:59:40,884 INFO L78 Accepts]: Start accepts. Automaton has 5044 states and 6858 transitions. Word has length 90 [2022-11-23 14:59:40,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:40,885 INFO L495 AbstractCegarLoop]: Abstraction has 5044 states and 6858 transitions. [2022-11-23 14:59:40,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-23 14:59:40,885 INFO L276 IsEmpty]: Start isEmpty. Operand 5044 states and 6858 transitions. [2022-11-23 14:59:40,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-23 14:59:40,888 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:40,888 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:40,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:41,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-23 14:59:41,100 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:41,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:41,100 INFO L85 PathProgramCache]: Analyzing trace with hash -307282759, now seen corresponding path program 2 times [2022-11-23 14:59:41,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:41,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901474609] [2022-11-23 14:59:41,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:41,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:41,110 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:59:41,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1218210245] [2022-11-23 14:59:41,110 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:59:41,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:41,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:41,112 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:41,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_989e9610-4036-45b6-b841-9cde5fe60174/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-23 14:59:41,208 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 14:59:41,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:41,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-23 14:59:41,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:42,708 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 35 refuted. 0 times theorem prover too weak. 265 trivial. 0 not checked. [2022-11-23 14:59:42,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:44,444 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 34 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-11-23 14:59:44,444 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:44,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901474609] [2022-11-23 14:59:44,444 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:59:44,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218210245] [2022-11-23 14:59:44,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218210245] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:44,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1160752540] [2022-11-23 14:59:44,446 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:59:44,446 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:44,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:44,447 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:44,447 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:18,669 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-23 15:00:18,738 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 15:00:18,759 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:24,879 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '95931#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 15:00:24,880 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:24,880 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:00:24,880 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 30 [2022-11-23 15:00:24,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121266115] [2022-11-23 15:00:24,880 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:24,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-23 15:00:24,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:24,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-23 15:00:24,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2608, Unknown=0, NotChecked=0, Total=2862 [2022-11-23 15:00:24,882 INFO L87 Difference]: Start difference. First operand 5044 states and 6858 transitions. Second operand has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2022-11-23 15:00:34,132 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:00:42,713 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:00:56,969 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:01:11,114 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:01:34,134 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:01:44,317 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.45s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:02:07,374 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:02:19,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:02:19,324 INFO L93 Difference]: Finished difference Result 8643 states and 11839 transitions. [2022-11-23 15:02:19,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-11-23 15:02:19,326 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) Word has length 99 [2022-11-23 15:02:19,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:02:19,348 INFO L225 Difference]: With dead ends: 8643 [2022-11-23 15:02:19,348 INFO L226 Difference]: Without dead ends: 6117 [2022-11-23 15:02:19,357 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5857 ImplicationChecksByTransitivity, 69.3s TimeCoverageRelationStatistics Valid=2421, Invalid=15401, Unknown=0, NotChecked=0, Total=17822 [2022-11-23 15:02:19,358 INFO L413 NwaCegarLoop]: 126 mSDtfsCounter, 551 mSDsluCounter, 998 mSDsCounter, 0 mSdLazyCounter, 2094 mSolverCounterSat, 674 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 45.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 551 SdHoareTripleChecker+Valid, 1124 SdHoareTripleChecker+Invalid, 2770 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 674 IncrementalHoareTripleChecker+Valid, 2094 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 46.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:02:19,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [551 Valid, 1124 Invalid, 2770 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [674 Valid, 2094 Invalid, 2 Unknown, 0 Unchecked, 46.0s Time] [2022-11-23 15:02:19,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6117 states.