./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS --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 30672bd579b7f25ffa685cb80d8a419cb542781c19afe0226ba5d9d3cf26984c --- 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-8393723 [2022-11-19 07:14:43,282 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 07:14:43,287 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 07:14:43,315 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 07:14:43,315 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 07:14:43,323 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 07:14:43,326 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 07:14:43,334 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 07:14:43,336 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 07:14:43,339 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 07:14:43,341 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 07:14:43,342 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 07:14:43,343 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 07:14:43,349 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 07:14:43,351 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 07:14:43,352 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 07:14:43,355 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 07:14:43,357 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 07:14:43,358 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 07:14:43,362 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 07:14:43,370 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 07:14:43,371 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 07:14:43,372 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 07:14:43,373 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 07:14:43,376 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 07:14:43,377 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 07:14:43,377 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 07:14:43,378 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 07:14:43,378 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 07:14:43,379 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 07:14:43,379 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 07:14:43,380 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 07:14:43,381 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 07:14:43,381 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 07:14:43,385 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 07:14:43,387 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 07:14:43,387 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 07:14:43,388 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 07:14:43,388 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 07:14:43,389 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 07:14:43,389 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 07:14:43,390 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 07:14:43,428 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 07:14:43,428 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 07:14:43,428 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 07:14:43,428 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 07:14:43,429 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 07:14:43,429 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 07:14:43,429 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 07:14:43,429 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 07:14:43,430 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 07:14:43,430 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 07:14:43,430 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 07:14:43,430 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 07:14:43,430 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 07:14:43,434 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 07:14:43,434 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 07:14:43,434 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 07:14:43,435 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 07:14:43,435 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 07:14:43,436 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 07:14:43,436 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 07:14:43,436 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 07:14:43,436 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 07:14:43,436 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 07:14:43,437 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 07:14:43,437 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 07:14:43,437 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 07:14:43,437 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 07:14:43,439 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 07:14:43,439 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 07:14:43,440 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 07:14:43,440 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 07:14:43,440 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 07:14:43,440 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:14:43,440 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 07:14:43,441 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 07:14:43,441 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 07:14:43,442 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 07:14:43,442 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 07:14:43,442 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 07:14:43,442 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 07:14:43,442 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 07:14:43,443 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_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 30672bd579b7f25ffa685cb80d8a419cb542781c19afe0226ba5d9d3cf26984c [2022-11-19 07:14:43,737 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 07:14:43,766 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 07:14:43,768 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 07:14:43,770 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 07:14:43,771 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 07:14:43,772 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound100.c [2022-11-19 07:14:43,838 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/data/c6da2ecb8/adc9813d260044ce8db152a8a3abe70b/FLAG8de37fe8f [2022-11-19 07:14:44,370 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 07:14:44,373 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound100.c [2022-11-19 07:14:44,382 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/data/c6da2ecb8/adc9813d260044ce8db152a8a3abe70b/FLAG8de37fe8f [2022-11-19 07:14:44,721 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/data/c6da2ecb8/adc9813d260044ce8db152a8a3abe70b [2022-11-19 07:14:44,723 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 07:14:44,725 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 07:14:44,726 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 07:14:44,727 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 07:14:44,733 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 07:14:44,734 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:14:44" (1/1) ... [2022-11-19 07:14:44,735 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7bdaf223 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:44, skipping insertion in model container [2022-11-19 07:14:44,736 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:14:44" (1/1) ... [2022-11-19 07:14:44,743 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 07:14:44,763 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 07:14:44,981 WARN L234 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_3ff869a4-9dc8-4b16-9744-43d156085ad7/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound100.c[490,503] [2022-11-19 07:14:45,002 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:14:45,010 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 07:14:45,025 WARN L234 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_3ff869a4-9dc8-4b16-9744-43d156085ad7/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound100.c[490,503] [2022-11-19 07:14:45,036 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:14:45,052 INFO L208 MainTranslator]: Completed translation [2022-11-19 07:14:45,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45 WrapperNode [2022-11-19 07:14:45,053 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 07:14:45,054 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 07:14:45,054 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 07:14:45,055 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 07:14:45,066 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,077 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,095 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 84 [2022-11-19 07:14:45,096 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 07:14:45,097 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 07:14:45,098 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 07:14:45,098 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 07:14:45,107 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,107 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,110 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,111 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,122 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,130 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,131 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,132 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,133 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 07:14:45,134 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 07:14:45,134 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 07:14:45,135 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 07:14:45,139 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (1/1) ... [2022-11-19 07:14:45,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:14:45,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:45,164 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 07:14:45,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 07:14:45,212 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 07:14:45,212 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-19 07:14:45,212 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-19 07:14:45,212 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 07:14:45,213 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 07:14:45,213 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 07:14:45,213 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-19 07:14:45,213 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-19 07:14:45,275 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 07:14:45,278 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 07:14:45,513 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 07:14:45,553 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 07:14:45,566 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-19 07:14:45,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:14:45 BoogieIcfgContainer [2022-11-19 07:14:45,569 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 07:14:45,571 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 07:14:45,571 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 07:14:45,575 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 07:14:45,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:14:44" (1/3) ... [2022-11-19 07:14:45,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2016dcb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:14:45, skipping insertion in model container [2022-11-19 07:14:45,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:14:45" (2/3) ... [2022-11-19 07:14:45,577 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2016dcb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:14:45, skipping insertion in model container [2022-11-19 07:14:45,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:14:45" (3/3) ... [2022-11-19 07:14:45,578 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_unwindbound100.c [2022-11-19 07:14:45,609 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 07:14:45,610 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 07:14:45,697 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 07:14:45,709 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;@373005a8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 07:14:45,709 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 07:14:45,713 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-19 07:14:45,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-19 07:14:45,721 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:45,722 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:45,723 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:45,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:45,731 INFO L85 PathProgramCache]: Analyzing trace with hash 2133247598, now seen corresponding path program 1 times [2022-11-19 07:14:45,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:45,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394227761] [2022-11-19 07:14:45,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:45,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:45,882 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:14:45,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1559124466] [2022-11-19 07:14:45,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:45,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:45,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:45,891 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:45,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 07:14:45,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:45,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-19 07:14:46,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:46,034 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:14:46,035 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 07:14:46,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:46,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394227761] [2022-11-19 07:14:46,036 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:14:46,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559124466] [2022-11-19 07:14:46,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559124466] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:14:46,038 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:14:46,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 07:14:46,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360717221] [2022-11-19 07:14:46,041 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:14:46,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-19 07:14:46,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:46,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-19 07:14:46,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 07:14:46,083 INFO L87 Difference]: Start difference. First operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 07:14:46,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:46,125 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2022-11-19 07:14:46,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-19 07:14:46,128 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 19 [2022-11-19 07:14:46,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:46,137 INFO L225 Difference]: With dead ends: 50 [2022-11-19 07:14:46,137 INFO L226 Difference]: Without dead ends: 27 [2022-11-19 07:14:46,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 07:14:46,146 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 [2022-11-19 07:14:46,148 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] [2022-11-19 07:14:46,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-19 07:14:46,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-19 07:14:46,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 16 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 07:14:46,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 38 transitions. [2022-11-19 07:14:46,198 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 38 transitions. Word has length 19 [2022-11-19 07:14:46,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:46,200 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 38 transitions. [2022-11-19 07:14:46,200 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 07:14:46,201 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 38 transitions. [2022-11-19 07:14:46,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-19 07:14:46,204 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:46,205 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:46,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 07:14:46,410 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-19 07:14:46,410 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:46,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:46,411 INFO L85 PathProgramCache]: Analyzing trace with hash 635683218, now seen corresponding path program 1 times [2022-11-19 07:14:46,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:46,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647821574] [2022-11-19 07:14:46,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:46,412 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:46,427 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:14:46,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1649382412] [2022-11-19 07:14:46,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:46,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:46,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:46,429 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:46,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 07:14:46,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:46,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 07:14:46,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:46,566 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:14:46,566 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 07:14:46,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:46,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647821574] [2022-11-19 07:14:46,567 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:14:46,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649382412] [2022-11-19 07:14:46,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649382412] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:14:46,568 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:14:46,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 07:14:46,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127038132] [2022-11-19 07:14:46,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:14:46,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:14:46,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:46,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:14:46,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:14:46,571 INFO L87 Difference]: Start difference. First operand 27 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 07:14:46,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:46,594 INFO L93 Difference]: Finished difference Result 37 states and 49 transitions. [2022-11-19 07:14:46,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:14:46,595 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2022-11-19 07:14:46,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:46,596 INFO L225 Difference]: With dead ends: 37 [2022-11-19 07:14:46,596 INFO L226 Difference]: Without dead ends: 29 [2022-11-19 07:14:46,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:14:46,598 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:14:46,598 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 91 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:14:46,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-19 07:14:46,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-19 07:14:46,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 07:14:46,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2022-11-19 07:14:46,606 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 20 [2022-11-19 07:14:46,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:46,607 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2022-11-19 07:14:46,607 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 07:14:46,607 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2022-11-19 07:14:46,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-19 07:14:46,608 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:46,608 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:46,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 07:14:46,813 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:46,814 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:46,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:46,815 INFO L85 PathProgramCache]: Analyzing trace with hash -1775243410, now seen corresponding path program 1 times [2022-11-19 07:14:46,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:46,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429794926] [2022-11-19 07:14:46,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:46,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:46,833 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:14:46,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [949118872] [2022-11-19 07:14:46,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:46,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:46,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:46,836 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:46,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 07:14:46,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:46,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 07:14:46,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:46,989 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 07:14:46,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:14:47,107 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 07:14:47,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:47,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429794926] [2022-11-19 07:14:47,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:14:47,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949118872] [2022-11-19 07:14:47,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949118872] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:14:47,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1421180986] [2022-11-19 07:14:47,131 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 07:14:47,131 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:14:47,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:14:47,140 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:14:47,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:14:47,917 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:14:47,942 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:14:49,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1421180986] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:14:49,799 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:14:49,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [5, 5] total 15 [2022-11-19 07:14:49,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498203029] [2022-11-19 07:14:49,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:14:49,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 07:14:49,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:49,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 07:14:49,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2022-11-19 07:14:49,801 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-19 07:14:50,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:50,556 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-11-19 07:14:50,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 07:14:50,559 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2022-11-19 07:14:50,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:50,560 INFO L225 Difference]: With dead ends: 38 [2022-11-19 07:14:50,560 INFO L226 Difference]: Without dead ends: 30 [2022-11-19 07:14:50,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2022-11-19 07:14:50,562 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:14:50,563 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 113 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:14:50,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-19 07:14:50,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-19 07:14:50,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 07:14:50,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2022-11-19 07:14:50,573 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 21 [2022-11-19 07:14:50,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:50,574 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2022-11-19 07:14:50,574 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-19 07:14:50,574 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2022-11-19 07:14:50,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-19 07:14:50,582 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:50,582 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:50,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 07:14:50,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:50,788 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:50,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:50,789 INFO L85 PathProgramCache]: Analyzing trace with hash -963684835, now seen corresponding path program 1 times [2022-11-19 07:14:50,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:50,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430470601] [2022-11-19 07:14:50,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:50,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:50,800 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:14:50,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1253426218] [2022-11-19 07:14:50,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:50,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:50,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:50,802 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:50,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 07:14:50,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:50,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-19 07:14:50,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:50,971 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 07:14:50,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:14:51,048 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:14:51,048 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:51,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430470601] [2022-11-19 07:14:51,052 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:14:51,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253426218] [2022-11-19 07:14:51,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253426218] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-19 07:14:51,054 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 07:14:51,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2022-11-19 07:14:51,054 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171259752] [2022-11-19 07:14:51,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:14:51,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:14:51,056 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:51,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:14:51,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-11-19 07:14:51,063 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 07:14:51,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:51,137 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2022-11-19 07:14:51,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 07:14:51,137 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 23 [2022-11-19 07:14:51,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:51,138 INFO L225 Difference]: With dead ends: 36 [2022-11-19 07:14:51,138 INFO L226 Difference]: Without dead ends: 34 [2022-11-19 07:14:51,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-19 07:14:51,140 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 8 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:14:51,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 95 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:14:51,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-19 07:14:51,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-11-19 07:14:51,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 07:14:51,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2022-11-19 07:14:51,153 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 23 [2022-11-19 07:14:51,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:51,153 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2022-11-19 07:14:51,153 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 07:14:51,154 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2022-11-19 07:14:51,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 07:14:51,154 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:51,155 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:51,167 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-19 07:14:51,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-11-19 07:14:51,360 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:51,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:51,360 INFO L85 PathProgramCache]: Analyzing trace with hash -748532437, now seen corresponding path program 1 times [2022-11-19 07:14:51,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:51,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959530734] [2022-11-19 07:14:51,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:51,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:51,371 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:14:51,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [227782667] [2022-11-19 07:14:51,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:51,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:51,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:51,373 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:51,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 07:14:51,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:51,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-19 07:14:51,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:51,495 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:14:51,495 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 07:14:51,495 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:51,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959530734] [2022-11-19 07:14:51,496 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:14:51,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227782667] [2022-11-19 07:14:51,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227782667] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:14:51,496 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:14:51,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 07:14:51,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722340338] [2022-11-19 07:14:51,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:14:51,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:14:51,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:51,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:14:51,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:14:51,498 INFO L87 Difference]: Start difference. First operand 34 states and 44 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 07:14:51,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:51,559 INFO L93 Difference]: Finished difference Result 59 states and 77 transitions. [2022-11-19 07:14:51,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 07:14:51,559 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 26 [2022-11-19 07:14:51,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:51,560 INFO L225 Difference]: With dead ends: 59 [2022-11-19 07:14:51,560 INFO L226 Difference]: Without dead ends: 36 [2022-11-19 07:14:51,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:14:51,562 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:14:51,562 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 91 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:14:51,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-19 07:14:51,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-11-19 07:14:51,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 23 states have internal predecessors, (27), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 07:14:51,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2022-11-19 07:14:51,598 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 26 [2022-11-19 07:14:51,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:51,599 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2022-11-19 07:14:51,599 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 07:14:51,599 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2022-11-19 07:14:51,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-19 07:14:51,600 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:51,600 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:51,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 07:14:51,817 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:51,817 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:51,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:51,817 INFO L85 PathProgramCache]: Analyzing trace with hash 47389219, now seen corresponding path program 1 times [2022-11-19 07:14:51,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:51,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351360617] [2022-11-19 07:14:51,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:51,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:51,827 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:14:51,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [833696321] [2022-11-19 07:14:51,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:51,827 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:51,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:51,829 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:51,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 07:14:51,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:51,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-19 07:14:51,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:52,103 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-19 07:14:52,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:14:52,261 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:14:52,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:52,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351360617] [2022-11-19 07:14:52,262 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:14:52,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833696321] [2022-11-19 07:14:52,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833696321] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-19 07:14:52,262 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 07:14:52,262 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 13 [2022-11-19 07:14:52,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221776369] [2022-11-19 07:14:52,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:14:52,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:14:52,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:52,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:14:52,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-11-19 07:14:52,264 INFO L87 Difference]: Start difference. First operand 36 states and 46 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, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-19 07:14:52,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:52,346 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2022-11-19 07:14:52,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 07:14:52,346 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, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 28 [2022-11-19 07:14:52,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:52,347 INFO L225 Difference]: With dead ends: 50 [2022-11-19 07:14:52,347 INFO L226 Difference]: Without dead ends: 48 [2022-11-19 07:14:52,348 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-11-19 07:14:52,348 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 7 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:14:52,349 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 121 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:14:52,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-19 07:14:52,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2022-11-19 07:14:52,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 28 states have (on average 1.25) internal successors, (35), 29 states have internal predecessors, (35), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-19 07:14:52,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 62 transitions. [2022-11-19 07:14:52,365 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 62 transitions. Word has length 28 [2022-11-19 07:14:52,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:52,365 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 62 transitions. [2022-11-19 07:14:52,365 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, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-19 07:14:52,366 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 62 transitions. [2022-11-19 07:14:52,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-19 07:14:52,366 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:52,367 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:52,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 07:14:52,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:52,573 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:52,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:52,573 INFO L85 PathProgramCache]: Analyzing trace with hash 2024014237, now seen corresponding path program 1 times [2022-11-19 07:14:52,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:52,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960422253] [2022-11-19 07:14:52,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:52,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:52,583 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:14:52,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [748572043] [2022-11-19 07:14:52,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:52,583 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:52,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:52,584 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:52,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 07:14:52,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:52,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-19 07:14:52,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:52,868 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 07:14:52,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:14:53,029 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-19 07:14:53,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:53,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960422253] [2022-11-19 07:14:53,030 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:14:53,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748572043] [2022-11-19 07:14:53,030 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748572043] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-19 07:14:53,030 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 07:14:53,031 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2022-11-19 07:14:53,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73299582] [2022-11-19 07:14:53,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:14:53,031 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:14:53,032 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:53,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:14:53,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-19 07:14:53,033 INFO L87 Difference]: Start difference. First operand 47 states and 62 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, (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) [2022-11-19 07:14:53,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:53,111 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2022-11-19 07:14:53,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 07:14:53,112 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, (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 33 [2022-11-19 07:14:53,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:53,113 INFO L225 Difference]: With dead ends: 54 [2022-11-19 07:14:53,113 INFO L226 Difference]: Without dead ends: 52 [2022-11-19 07:14:53,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-11-19 07:14:53,121 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 7 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:14:53,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 112 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:14:53,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-19 07:14:53,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2022-11-19 07:14:53,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 32 states have internal predecessors, (38), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-19 07:14:53,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 65 transitions. [2022-11-19 07:14:53,157 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 65 transitions. Word has length 33 [2022-11-19 07:14:53,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:53,158 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 65 transitions. [2022-11-19 07:14:53,158 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, (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) [2022-11-19 07:14:53,158 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 65 transitions. [2022-11-19 07:14:53,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-19 07:14:53,161 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:53,162 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:53,175 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 07:14:53,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:53,367 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:53,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:53,368 INFO L85 PathProgramCache]: Analyzing trace with hash 613928483, now seen corresponding path program 1 times [2022-11-19 07:14:53,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:53,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135098283] [2022-11-19 07:14:53,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:53,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:53,394 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:14:53,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1921035426] [2022-11-19 07:14:53,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:53,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:53,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:53,398 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:53,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 07:14:53,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:53,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-19 07:14:53,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:53,634 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-19 07:14:53,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:14:53,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:53,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135098283] [2022-11-19 07:14:53,734 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:14:53,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921035426] [2022-11-19 07:14:53,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1921035426] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:14:53,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [305848607] [2022-11-19 07:14:53,737 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-19 07:14:53,737 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:14:53,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:14:53,737 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:14:53,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:14:55,164 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-19 07:14:55,174 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:14:55,192 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:15:09,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [305848607] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:15:09,986 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 07:15:09,987 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [7] total 22 [2022-11-19 07:15:09,987 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111542237] [2022-11-19 07:15:09,987 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:15:09,988 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-19 07:15:09,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:15:09,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-19 07:15:09,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2022-11-19 07:15:09,989 INFO L87 Difference]: Start difference. First operand 51 states and 65 transitions. Second operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-19 07:15:10,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:15:10,986 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2022-11-19 07:15:10,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-19 07:15:10,986 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 38 [2022-11-19 07:15:10,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:15:10,988 INFO L225 Difference]: With dead ends: 75 [2022-11-19 07:15:10,988 INFO L226 Difference]: Without dead ends: 73 [2022-11-19 07:15:10,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 47 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2022-11-19 07:15:10,989 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 7 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:15:10,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 117 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 07:15:10,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-19 07:15:11,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2022-11-19 07:15:11,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 45 states have internal predecessors, (50), 18 states have call successors, (18), 9 states have call predecessors, (18), 9 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-11-19 07:15:11,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2022-11-19 07:15:11,012 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 38 [2022-11-19 07:15:11,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:15:11,012 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2022-11-19 07:15:11,013 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-19 07:15:11,013 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2022-11-19 07:15:11,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-19 07:15:11,014 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:15:11,014 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 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] [2022-11-19 07:15:11,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 07:15:11,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-19 07:15:11,223 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:15:11,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:15:11,223 INFO L85 PathProgramCache]: Analyzing trace with hash 55138950, now seen corresponding path program 1 times [2022-11-19 07:15:11,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:15:11,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164844634] [2022-11-19 07:15:11,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:15:11,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:15:11,235 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:15:11,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1673847750] [2022-11-19 07:15:11,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:15:11,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:15:11,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:15:11,240 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:15:11,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 07:15:11,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:15:11,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 07:15:11,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:15:11,383 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 07:15:11,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:15:11,483 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 07:15:11,484 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:15:11,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164844634] [2022-11-19 07:15:11,484 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:15:11,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1673847750] [2022-11-19 07:15:11,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1673847750] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:15:11,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1787997836] [2022-11-19 07:15:11,490 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-19 07:15:11,490 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:15:11,491 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:15:11,491 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:15:11,491 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:15:23,389 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-19 07:15:23,394 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:15:23,414 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:15:32,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1787997836] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:15:32,393 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:15:32,393 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [5, 6] total 26 [2022-11-19 07:15:32,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144359551] [2022-11-19 07:15:32,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:15:32,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 07:15:32,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:15:32,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 07:15:32,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=492, Unknown=0, NotChecked=0, Total=650 [2022-11-19 07:15:32,395 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-19 07:15:35,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:15:35,696 INFO L93 Difference]: Finished difference Result 114 states and 143 transitions. [2022-11-19 07:15:35,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-19 07:15:35,697 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 47 [2022-11-19 07:15:35,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:15:35,698 INFO L225 Difference]: With dead ends: 114 [2022-11-19 07:15:35,699 INFO L226 Difference]: Without dead ends: 91 [2022-11-19 07:15:35,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 103 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=173, Invalid=529, Unknown=0, NotChecked=0, Total=702 [2022-11-19 07:15:35,700 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 6 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:15:35,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 121 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 07:15:35,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-19 07:15:35,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-11-19 07:15:35,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 57 states have (on average 1.1578947368421053) internal successors, (66), 58 states have internal predecessors, (66), 22 states have call successors, (22), 11 states have call predecessors, (22), 11 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-11-19 07:15:35,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 109 transitions. [2022-11-19 07:15:35,730 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 109 transitions. Word has length 47 [2022-11-19 07:15:35,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:15:35,730 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 109 transitions. [2022-11-19 07:15:35,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-19 07:15:35,731 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 109 transitions. [2022-11-19 07:15:35,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-19 07:15:35,732 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:15:35,732 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 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] [2022-11-19 07:15:35,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 07:15:35,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-19 07:15:35,937 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:15:35,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:15:35,937 INFO L85 PathProgramCache]: Analyzing trace with hash -885230527, now seen corresponding path program 1 times [2022-11-19 07:15:35,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:15:35,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047988737] [2022-11-19 07:15:35,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:15:35,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:15:35,946 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:15:35,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1654489543] [2022-11-19 07:15:35,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:15:35,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:15:35,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:15:35,947 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:15:35,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 07:15:36,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:15:36,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 07:15:36,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:15:36,094 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 07:15:36,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:15:36,178 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 07:15:36,178 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:15:36,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047988737] [2022-11-19 07:15:36,179 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:15:36,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654489543] [2022-11-19 07:15:36,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1654489543] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:15:36,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667207104] [2022-11-19 07:15:36,182 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-19 07:15:36,182 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:15:36,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:15:36,183 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:15:36,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:15:51,833 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-19 07:15:51,838 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:15:51,854 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:16:00,821 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3003#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:16:00,821 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:16:00,822 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:16:00,822 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-11-19 07:16:00,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784653839] [2022-11-19 07:16:00,822 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:16:00,823 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-19 07:16:00,823 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:16:00,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-19 07:16:00,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=874, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 07:16:00,824 INFO L87 Difference]: Start difference. First operand 91 states and 109 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2022-11-19 07:16:01,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:16:01,113 INFO L93 Difference]: Finished difference Result 239 states and 287 transitions. [2022-11-19 07:16:01,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 07:16:01,113 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 49 [2022-11-19 07:16:01,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:16:01,115 INFO L225 Difference]: With dead ends: 239 [2022-11-19 07:16:01,115 INFO L226 Difference]: Without dead ends: 216 [2022-11-19 07:16:01,116 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=212, Invalid=1120, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 07:16:01,117 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 88 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:16:01,117 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 197 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:16:01,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-11-19 07:16:01,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 202. [2022-11-19 07:16:01,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 130 states have (on average 1.1615384615384616) internal successors, (151), 133 states have internal predecessors, (151), 46 states have call successors, (46), 25 states have call predecessors, (46), 25 states have return successors, (43), 43 states have call predecessors, (43), 43 states have call successors, (43) [2022-11-19 07:16:01,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 240 transitions. [2022-11-19 07:16:01,171 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 240 transitions. Word has length 49 [2022-11-19 07:16:01,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:16:01,172 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 240 transitions. [2022-11-19 07:16:01,172 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2022-11-19 07:16:01,172 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 240 transitions. [2022-11-19 07:16:01,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-19 07:16:01,173 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:16:01,173 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 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] [2022-11-19 07:16:01,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 07:16:01,378 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:01,378 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:16:01,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:16:01,379 INFO L85 PathProgramCache]: Analyzing trace with hash -1699609543, now seen corresponding path program 1 times [2022-11-19 07:16:01,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:16:01,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720356451] [2022-11-19 07:16:01,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:01,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:16:01,396 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:16:01,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [863909769] [2022-11-19 07:16:01,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:01,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:01,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:16:01,398 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:16:01,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 07:16:01,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:16:01,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-19 07:16:01,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:16:01,586 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-19 07:16:01,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:16:01,708 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-19 07:16:01,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:16:01,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720356451] [2022-11-19 07:16:01,709 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:16:01,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863909769] [2022-11-19 07:16:01,709 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [863909769] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:16:01,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [653461099] [2022-11-19 07:16:01,714 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:16:01,715 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:16:01,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:16:01,716 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:16:01,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:16:07,368 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-19 07:16:07,372 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:16:07,395 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:16:18,376 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4033#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:16:18,376 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:16:18,377 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:16:18,377 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-19 07:16:18,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890262943] [2022-11-19 07:16:18,377 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:16:18,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-19 07:16:18,378 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:16:18,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-19 07:16:18,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2022-11-19 07:16:18,379 INFO L87 Difference]: Start difference. First operand 202 states and 240 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2022-11-19 07:16:18,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:16:18,672 INFO L93 Difference]: Finished difference Result 231 states and 277 transitions. [2022-11-19 07:16:18,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 07:16:18,673 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 61 [2022-11-19 07:16:18,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:16:18,676 INFO L225 Difference]: With dead ends: 231 [2022-11-19 07:16:18,676 INFO L226 Difference]: Without dead ends: 229 [2022-11-19 07:16:18,677 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=140, Invalid=852, Unknown=0, NotChecked=0, Total=992 [2022-11-19 07:16:18,678 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 19 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:16:18,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 76 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:16:18,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-11-19 07:16:18,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 228. [2022-11-19 07:16:18,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 145 states have (on average 1.1448275862068966) internal successors, (166), 150 states have internal predecessors, (166), 54 states have call successors, (54), 28 states have call predecessors, (54), 28 states have return successors, (51), 49 states have call predecessors, (51), 51 states have call successors, (51) [2022-11-19 07:16:18,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 271 transitions. [2022-11-19 07:16:18,735 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 271 transitions. Word has length 61 [2022-11-19 07:16:18,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:16:18,736 INFO L495 AbstractCegarLoop]: Abstraction has 228 states and 271 transitions. [2022-11-19 07:16:18,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2022-11-19 07:16:18,736 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 271 transitions. [2022-11-19 07:16:18,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-19 07:16:18,738 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:16:18,738 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 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, 1, 1, 1, 1] [2022-11-19 07:16:18,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 07:16:18,943 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:18,944 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:16:18,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:16:18,944 INFO L85 PathProgramCache]: Analyzing trace with hash 1184603440, now seen corresponding path program 1 times [2022-11-19 07:16:18,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:16:18,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811362496] [2022-11-19 07:16:18,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:18,944 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:16:18,953 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:16:18,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [251345242] [2022-11-19 07:16:18,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:18,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:18,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:16:18,955 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:16:18,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 07:16:19,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:16:19,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 07:16:19,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:16:19,134 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 16 proven. 73 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-11-19 07:16:19,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:16:19,237 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-19 07:16:19,237 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:16:19,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811362496] [2022-11-19 07:16:19,237 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:16:19,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251345242] [2022-11-19 07:16:19,238 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [251345242] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:16:19,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1400030177] [2022-11-19 07:16:19,240 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-19 07:16:19,240 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:16:19,241 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:16:19,241 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:16:19,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:16:31,269 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-11-19 07:16:31,272 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:16:31,287 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:16:35,178 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5147#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-19 07:16:35,179 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:16:35,179 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:16:35,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-11-19 07:16:35,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572192493] [2022-11-19 07:16:35,179 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:16:35,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 07:16:35,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:16:35,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 07:16:35,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=733, Unknown=0, NotChecked=0, Total=930 [2022-11-19 07:16:35,181 INFO L87 Difference]: Start difference. First operand 228 states and 271 transitions. Second operand has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 7 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 6 states have call predecessors, (24), 6 states have call successors, (24) [2022-11-19 07:16:35,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:16:35,561 INFO L93 Difference]: Finished difference Result 372 states and 446 transitions. [2022-11-19 07:16:35,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-19 07:16:35,562 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 7 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 6 states have call predecessors, (24), 6 states have call successors, (24) Word has length 70 [2022-11-19 07:16:35,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:16:35,569 INFO L225 Difference]: With dead ends: 372 [2022-11-19 07:16:35,570 INFO L226 Difference]: Without dead ends: 352 [2022-11-19 07:16:35,571 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=255, Invalid=1077, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 07:16:35,572 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 122 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:16:35,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 288 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:16:35,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-11-19 07:16:35,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 336. [2022-11-19 07:16:35,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 209 states have (on average 1.1483253588516746) internal successors, (240), 218 states have internal predecessors, (240), 86 states have call successors, (86), 40 states have call predecessors, (86), 40 states have return successors, (81), 77 states have call predecessors, (81), 81 states have call successors, (81) [2022-11-19 07:16:35,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 407 transitions. [2022-11-19 07:16:35,676 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 407 transitions. Word has length 70 [2022-11-19 07:16:35,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:16:35,677 INFO L495 AbstractCegarLoop]: Abstraction has 336 states and 407 transitions. [2022-11-19 07:16:35,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 7 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 6 states have call predecessors, (24), 6 states have call successors, (24) [2022-11-19 07:16:35,677 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 407 transitions. [2022-11-19 07:16:35,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-19 07:16:35,678 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:16:35,679 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 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, 1, 1, 1] [2022-11-19 07:16:35,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 07:16:35,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-19 07:16:35,885 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:16:35,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:16:35,885 INFO L85 PathProgramCache]: Analyzing trace with hash -1938585712, now seen corresponding path program 1 times [2022-11-19 07:16:35,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:16:35,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282667106] [2022-11-19 07:16:35,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:35,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:16:35,898 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:16:35,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [202005636] [2022-11-19 07:16:35,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:35,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:35,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:16:35,902 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:16:35,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 07:16:35,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:16:35,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-19 07:16:35,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:16:36,536 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-11-19 07:16:36,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:16:37,352 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-19 07:16:37,352 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:16:37,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282667106] [2022-11-19 07:16:37,353 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:16:37,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [202005636] [2022-11-19 07:16:37,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [202005636] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:16:37,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2092413841] [2022-11-19 07:16:37,355 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-19 07:16:37,355 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:16:37,355 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:16:37,356 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:16:37,356 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:16:51,754 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-19 07:16:51,758 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:16:51,773 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:17:01,039 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6648#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:17:01,039 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:17:01,039 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:17:01,039 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2022-11-19 07:17:01,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141326486] [2022-11-19 07:17:01,039 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:17:01,039 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 07:17:01,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:17:01,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 07:17:01,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1632, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 07:17:01,040 INFO L87 Difference]: Start difference. First operand 336 states and 407 transitions. Second operand has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-19 07:17:16,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:17:16,229 INFO L93 Difference]: Finished difference Result 458 states and 584 transitions. [2022-11-19 07:17:16,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 07:17:16,230 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 71 [2022-11-19 07:17:16,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:17:16,233 INFO L225 Difference]: With dead ends: 458 [2022-11-19 07:17:16,233 INFO L226 Difference]: Without dead ends: 454 [2022-11-19 07:17:16,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1161 ImplicationChecksByTransitivity, 17.4s TimeCoverageRelationStatistics Valid=491, Invalid=3799, Unknown=0, NotChecked=0, Total=4290 [2022-11-19 07:17:16,235 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 251 mSDsluCounter, 452 mSDsCounter, 0 mSdLazyCounter, 836 mSolverCounterSat, 262 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 255 SdHoareTripleChecker+Valid, 534 SdHoareTripleChecker+Invalid, 1098 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 262 IncrementalHoareTripleChecker+Valid, 836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:17:16,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [255 Valid, 534 Invalid, 1098 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [262 Valid, 836 Invalid, 0 Unknown, 0 Unchecked, 7.5s Time] [2022-11-19 07:17:16,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2022-11-19 07:17:16,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 424. [2022-11-19 07:17:16,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 266 states have (on average 1.1879699248120301) internal successors, (316), 274 states have internal predecessors, (316), 113 states have call successors, (113), 45 states have call predecessors, (113), 44 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2022-11-19 07:17:16,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 537 transitions. [2022-11-19 07:17:16,373 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 537 transitions. Word has length 71 [2022-11-19 07:17:16,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:17:16,373 INFO L495 AbstractCegarLoop]: Abstraction has 424 states and 537 transitions. [2022-11-19 07:17:16,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-19 07:17:16,374 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 537 transitions. [2022-11-19 07:17:16,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-19 07:17:16,375 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:17:16,375 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 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, 1, 1, 1, 1, 1] [2022-11-19 07:17:16,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 07:17:16,580 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:17:16,580 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:17:16,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:17:16,580 INFO L85 PathProgramCache]: Analyzing trace with hash -1382598768, now seen corresponding path program 1 times [2022-11-19 07:17:16,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:17:16,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486425377] [2022-11-19 07:17:16,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:17:16,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:17:16,588 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:17:16,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1216083040] [2022-11-19 07:17:16,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:17:16,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:17:16,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:17:16,590 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:17:16,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 07:17:16,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:17:16,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-19 07:17:16,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:17:17,261 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 35 proven. 20 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2022-11-19 07:17:17,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:17:17,561 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 40 proven. 7 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2022-11-19 07:17:17,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:17:17,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486425377] [2022-11-19 07:17:17,561 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:17:17,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216083040] [2022-11-19 07:17:17,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216083040] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:17:17,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1304970742] [2022-11-19 07:17:17,563 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-19 07:17:17,563 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:17:17,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:17:17,564 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:17:17,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:17:29,232 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-11-19 07:17:29,235 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:17:29,250 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:17:33,794 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8478#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-19 07:17:33,794 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:17:33,794 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:17:33,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 19 [2022-11-19 07:17:33,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999160036] [2022-11-19 07:17:33,795 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:17:33,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-19 07:17:33,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:17:33,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-19 07:17:33,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1376, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 07:17:33,797 INFO L87 Difference]: Start difference. First operand 424 states and 537 transitions. Second operand has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) [2022-11-19 07:17:39,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:17:39,043 INFO L93 Difference]: Finished difference Result 556 states and 710 transitions. [2022-11-19 07:17:39,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-19 07:17:39,043 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) Word has length 76 [2022-11-19 07:17:39,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:17:39,046 INFO L225 Difference]: With dead ends: 556 [2022-11-19 07:17:39,046 INFO L226 Difference]: Without dead ends: 522 [2022-11-19 07:17:39,048 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 762 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=300, Invalid=2250, Unknown=0, NotChecked=0, Total=2550 [2022-11-19 07:17:39,048 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 109 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 750 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 856 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 750 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:17:39,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 299 Invalid, 856 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 750 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-19 07:17:39,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2022-11-19 07:17:39,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 453. [2022-11-19 07:17:39,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 293 states have (on average 1.174061433447099) internal successors, (344), 300 states have internal predecessors, (344), 109 states have call successors, (109), 50 states have call predecessors, (109), 50 states have return successors, (105), 102 states have call predecessors, (105), 105 states have call successors, (105) [2022-11-19 07:17:39,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 558 transitions. [2022-11-19 07:17:39,179 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 558 transitions. Word has length 76 [2022-11-19 07:17:39,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:17:39,179 INFO L495 AbstractCegarLoop]: Abstraction has 453 states and 558 transitions. [2022-11-19 07:17:39,180 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) [2022-11-19 07:17:39,180 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 558 transitions. [2022-11-19 07:17:39,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-11-19 07:17:39,181 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:17:39,181 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:17:39,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 07:17:39,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 07:17:39,387 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:17:39,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:17:39,388 INFO L85 PathProgramCache]: Analyzing trace with hash -698925503, now seen corresponding path program 1 times [2022-11-19 07:17:39,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:17:39,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292448418] [2022-11-19 07:17:39,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:17:39,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:17:39,408 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:17:39,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [283816487] [2022-11-19 07:17:39,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:17:39,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:17:39,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:17:39,411 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:17:39,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 07:17:39,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:17:39,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-19 07:17:39,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:17:40,476 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 51 proven. 26 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2022-11-19 07:17:40,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:17:42,253 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 51 proven. 23 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2022-11-19 07:17:42,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:17:42,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292448418] [2022-11-19 07:17:42,254 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:17:42,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283816487] [2022-11-19 07:17:42,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283816487] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:17:42,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1063103315] [2022-11-19 07:17:42,256 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 07:17:42,257 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:17:42,257 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:17:42,257 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:17:42,257 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:17:53,988 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2022-11-19 07:17:53,991 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:17:54,006 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:18:07,589 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10538#(and (<= ~counter~0 101) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-19 07:18:07,589 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:18:07,589 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:18:07,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 21 [2022-11-19 07:18:07,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878688503] [2022-11-19 07:18:07,590 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:18:07,590 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-19 07:18:07,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:18:07,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-19 07:18:07,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=1415, Unknown=2, NotChecked=0, Total=1640 [2022-11-19 07:18:07,592 INFO L87 Difference]: Start difference. First operand 453 states and 558 transitions. Second operand has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-19 07:18:08,679 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2022-11-19 07:18:22,944 WARN L233 SmtUtils]: Spent 12.04s on a formula simplification that was a NOOP. DAG size: 68 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 07:18:28,996 WARN L233 SmtUtils]: Spent 5.37s on a formula simplification that was a NOOP. DAG size: 61 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 07:18:41,752 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 07:18:47,366 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 07:19:00,583 WARN L233 SmtUtils]: Spent 5.01s on a formula simplification that was a NOOP. DAG size: 65 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 07:19:06,763 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 07:19:21,554 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 07:19:32,451 WARN L233 SmtUtils]: Spent 6.77s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 07:19:32,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:19:32,461 INFO L93 Difference]: Finished difference Result 584 states and 743 transitions. [2022-11-19 07:19:32,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-19 07:19:32,461 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) Word has length 88 [2022-11-19 07:19:32,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:19:32,465 INFO L225 Difference]: With dead ends: 584 [2022-11-19 07:19:32,465 INFO L226 Difference]: Without dead ends: 582 [2022-11-19 07:19:32,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 222 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1053 ImplicationChecksByTransitivity, 76.7s TimeCoverageRelationStatistics Valid=520, Invalid=2895, Unknown=7, NotChecked=0, Total=3422 [2022-11-19 07:19:32,470 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 172 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 921 mSolverCounterSat, 192 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 1117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 921 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:19:32,472 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 252 Invalid, 1117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 921 Invalid, 4 Unknown, 0 Unchecked, 22.5s Time] [2022-11-19 07:19:32,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2022-11-19 07:19:32,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 554. [2022-11-19 07:19:32,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 554 states, 362 states have (on average 1.1961325966850829) internal successors, (433), 370 states have internal predecessors, (433), 137 states have call successors, (137), 54 states have call predecessors, (137), 54 states have return successors, (133), 129 states have call predecessors, (133), 133 states have call successors, (133) [2022-11-19 07:19:32,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 554 states to 554 states and 703 transitions. [2022-11-19 07:19:32,807 INFO L78 Accepts]: Start accepts. Automaton has 554 states and 703 transitions. Word has length 88 [2022-11-19 07:19:32,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:19:32,807 INFO L495 AbstractCegarLoop]: Abstraction has 554 states and 703 transitions. [2022-11-19 07:19:32,808 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-19 07:19:32,808 INFO L276 IsEmpty]: Start isEmpty. Operand 554 states and 703 transitions. [2022-11-19 07:19:32,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-19 07:19:32,811 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:19:32,812 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:19:32,822 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-19 07:19:33,022 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 07:19:33,022 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:19:33,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:19:33,022 INFO L85 PathProgramCache]: Analyzing trace with hash -1250044008, now seen corresponding path program 2 times [2022-11-19 07:19:33,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:19:33,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900766540] [2022-11-19 07:19:33,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:19:33,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:19:33,034 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:19:33,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1365986164] [2022-11-19 07:19:33,034 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:19:33,035 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:19:33,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:19:33,036 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:19:33,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 07:19:33,102 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 07:19:33,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:19:33,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-19 07:19:33,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:19:33,141 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2022-11-19 07:19:33,141 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 07:19:33,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:19:33,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900766540] [2022-11-19 07:19:33,142 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:19:33,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365986164] [2022-11-19 07:19:33,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365986164] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:19:33,142 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:19:33,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 07:19:33,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525705294] [2022-11-19 07:19:33,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:19:33,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:19:33,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:19:33,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:19:33,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:19:33,144 INFO L87 Difference]: Start difference. First operand 554 states and 703 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-11-19 07:19:33,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:19:33,479 INFO L93 Difference]: Finished difference Result 722 states and 935 transitions. [2022-11-19 07:19:33,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 07:19:33,480 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 98 [2022-11-19 07:19:33,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:19:33,483 INFO L225 Difference]: With dead ends: 722 [2022-11-19 07:19:33,483 INFO L226 Difference]: Without dead ends: 519 [2022-11-19 07:19:33,484 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-19 07:19:33,484 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 12 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:19:33,485 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 147 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:19:33,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2022-11-19 07:19:33,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 494. [2022-11-19 07:19:33,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 494 states, 319 states have (on average 1.188087774294671) internal successors, (379), 327 states have internal predecessors, (379), 126 states have call successors, (126), 48 states have call predecessors, (126), 48 states have return successors, (123), 118 states have call predecessors, (123), 123 states have call successors, (123) [2022-11-19 07:19:33,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 628 transitions. [2022-11-19 07:19:33,738 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 628 transitions. Word has length 98 [2022-11-19 07:19:33,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:19:33,738 INFO L495 AbstractCegarLoop]: Abstraction has 494 states and 628 transitions. [2022-11-19 07:19:33,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-11-19 07:19:33,738 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 628 transitions. [2022-11-19 07:19:33,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-19 07:19:33,740 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:19:33,740 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:19:33,746 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-19 07:19:33,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 07:19:33,947 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:19:33,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:19:33,948 INFO L85 PathProgramCache]: Analyzing trace with hash 1144504099, now seen corresponding path program 1 times [2022-11-19 07:19:33,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:19:33,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922577892] [2022-11-19 07:19:33,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:19:33,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:19:33,963 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:19:33,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1699850583] [2022-11-19 07:19:33,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:19:33,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:19:33,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:19:33,965 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:19:33,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 07:19:34,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:19:34,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-19 07:19:34,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:19:34,198 INFO L134 CoverageAnalysis]: Checked inductivity of 348 backedges. 35 proven. 229 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-19 07:19:34,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:19:34,369 INFO L134 CoverageAnalysis]: Checked inductivity of 348 backedges. 35 proven. 37 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-11-19 07:19:34,369 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:19:34,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922577892] [2022-11-19 07:19:34,369 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:19:34,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699850583] [2022-11-19 07:19:34,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699850583] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:19:34,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055685488] [2022-11-19 07:19:34,371 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-19 07:19:34,372 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:19:34,372 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:19:34,372 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:19:34,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:19:40,654 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2022-11-19 07:19:40,687 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:19:40,701 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:19:43,830 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14960#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|))' at error location [2022-11-19 07:19:43,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:19:43,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:19:43,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2022-11-19 07:19:43,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156893045] [2022-11-19 07:19:43,831 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:19:43,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 07:19:43,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:19:43,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 07:19:43,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=1013, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 07:19:43,833 INFO L87 Difference]: Start difference. First operand 494 states and 628 transitions. Second operand has 18 states, 18 states have (on average 3.8333333333333335) internal successors, (69), 18 states have internal predecessors, (69), 9 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) [2022-11-19 07:19:45,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:19:45,118 INFO L93 Difference]: Finished difference Result 1252 states and 1698 transitions. [2022-11-19 07:19:45,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-19 07:19:45,119 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.8333333333333335) internal successors, (69), 18 states have internal predecessors, (69), 9 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) Word has length 104 [2022-11-19 07:19:45,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:19:45,125 INFO L225 Difference]: With dead ends: 1252 [2022-11-19 07:19:45,125 INFO L226 Difference]: Without dead ends: 1132 [2022-11-19 07:19:45,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 255 SyntacticMatches, 20 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1717 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=505, Invalid=1847, Unknown=0, NotChecked=0, Total=2352 [2022-11-19 07:19:45,128 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 313 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:19:45,128 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [313 Valid, 368 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:19:45,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1132 states. [2022-11-19 07:19:45,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1132 to 1108. [2022-11-19 07:19:45,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1108 states, 691 states have (on average 1.1765557163531115) internal successors, (813), 708 states have internal predecessors, (813), 320 states have call successors, (320), 96 states have call predecessors, (320), 96 states have return successors, (311), 303 states have call predecessors, (311), 311 states have call successors, (311) [2022-11-19 07:19:45,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1108 states to 1108 states and 1444 transitions. [2022-11-19 07:19:45,641 INFO L78 Accepts]: Start accepts. Automaton has 1108 states and 1444 transitions. Word has length 104 [2022-11-19 07:19:45,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:19:45,642 INFO L495 AbstractCegarLoop]: Abstraction has 1108 states and 1444 transitions. [2022-11-19 07:19:45,642 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.8333333333333335) internal successors, (69), 18 states have internal predecessors, (69), 9 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) [2022-11-19 07:19:45,642 INFO L276 IsEmpty]: Start isEmpty. Operand 1108 states and 1444 transitions. [2022-11-19 07:19:45,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-19 07:19:45,644 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:19:45,644 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:19:45,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 07:19:45,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 07:19:45,850 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:19:45,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:19:45,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1878404201, now seen corresponding path program 2 times [2022-11-19 07:19:45,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:19:45,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416972587] [2022-11-19 07:19:45,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:19:45,851 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:19:45,863 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:19:45,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [82956433] [2022-11-19 07:19:45,863 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:19:45,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:19:45,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:19:45,865 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:19:45,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 07:19:46,147 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 07:19:46,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:19:46,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-19 07:19:46,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:19:46,826 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 31 proven. 39 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-11-19 07:19:46,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:19:47,828 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 28 proven. 39 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-11-19 07:19:47,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:19:47,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416972587] [2022-11-19 07:19:47,829 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:19:47,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82956433] [2022-11-19 07:19:47,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82956433] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:19:47,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1887940408] [2022-11-19 07:19:47,830 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 07:19:47,831 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:19:47,831 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:19:47,831 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:19:47,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:19:59,500 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2022-11-19 07:19:59,504 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:19:59,518 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:20:06,047 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19161#(and (<= ~counter~0 101) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-19 07:20:06,047 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:20:06,047 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:20:06,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 19 [2022-11-19 07:20:06,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095822398] [2022-11-19 07:20:06,047 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:20:06,048 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-19 07:20:06,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:20:06,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-19 07:20:06,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1295, Unknown=0, NotChecked=0, Total=1482 [2022-11-19 07:20:06,049 INFO L87 Difference]: Start difference. First operand 1108 states and 1444 transitions. Second operand has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) [2022-11-19 07:20:24,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:20:24,401 INFO L93 Difference]: Finished difference Result 1688 states and 2278 transitions. [2022-11-19 07:20:24,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 07:20:24,401 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) Word has length 106 [2022-11-19 07:20:24,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:20:24,409 INFO L225 Difference]: With dead ends: 1688 [2022-11-19 07:20:24,409 INFO L226 Difference]: Without dead ends: 1686 [2022-11-19 07:20:24,412 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1440 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=685, Invalid=4427, Unknown=0, NotChecked=0, Total=5112 [2022-11-19 07:20:24,412 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 142 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 1074 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 1248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 1074 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:20:24,413 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 666 Invalid, 1248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 1074 Invalid, 0 Unknown, 0 Unchecked, 7.9s Time] [2022-11-19 07:20:24,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1686 states. [2022-11-19 07:20:25,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1686 to 1572. [2022-11-19 07:20:25,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1572 states, 967 states have (on average 1.1985522233712513) internal successors, (1159), 984 states have internal predecessors, (1159), 480 states have call successors, (480), 124 states have call predecessors, (480), 124 states have return successors, (471), 463 states have call predecessors, (471), 471 states have call successors, (471) [2022-11-19 07:20:25,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1572 states to 1572 states and 2110 transitions. [2022-11-19 07:20:25,324 INFO L78 Accepts]: Start accepts. Automaton has 1572 states and 2110 transitions. Word has length 106 [2022-11-19 07:20:25,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:20:25,325 INFO L495 AbstractCegarLoop]: Abstraction has 1572 states and 2110 transitions. [2022-11-19 07:20:25,326 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) [2022-11-19 07:20:25,326 INFO L276 IsEmpty]: Start isEmpty. Operand 1572 states and 2110 transitions. [2022-11-19 07:20:25,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-19 07:20:25,329 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:20:25,329 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:20:25,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 07:20:25,535 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 07:20:25,536 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:20:25,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:20:25,536 INFO L85 PathProgramCache]: Analyzing trace with hash -1268150453, now seen corresponding path program 3 times [2022-11-19 07:20:25,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:20:25,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553608738] [2022-11-19 07:20:25,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:20:25,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:20:25,545 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:20:25,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1560081176] [2022-11-19 07:20:25,545 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:20:25,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:20:25,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:20:25,547 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:20:25,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 07:20:25,629 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:20:25,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:20:25,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-19 07:20:25,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:20:26,594 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 57 proven. 59 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2022-11-19 07:20:26,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:20:28,592 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 65 proven. 48 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2022-11-19 07:20:28,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:20:28,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553608738] [2022-11-19 07:20:28,592 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:20:28,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560081176] [2022-11-19 07:20:28,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560081176] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:20:28,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1879765291] [2022-11-19 07:20:28,594 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 07:20:28,594 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:20:28,594 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:20:28,595 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:20:28,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:20:41,112 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 19 iterations. Over-approximation may be very coarse. [2022-11-19 07:20:48,553 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 07:20:48,558 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:20:48,573 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:21:02,230 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24834#(and (<= 2 ~counter~0) (<= ~counter~0 101) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:21:02,230 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:21:02,230 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:21:02,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 27 [2022-11-19 07:21:02,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378176381] [2022-11-19 07:21:02,231 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:21:02,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-19 07:21:02,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:21:02,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-19 07:21:02,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=2102, Unknown=0, NotChecked=0, Total=2352 [2022-11-19 07:21:02,233 INFO L87 Difference]: Start difference. First operand 1572 states and 2110 transitions. Second operand has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 24 states have internal predecessors, (62), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 13 states have call predecessors, (36), 13 states have call successors, (36) [2022-11-19 07:21:26,855 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.26s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 07:21:31,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:21:31,422 INFO L93 Difference]: Finished difference Result 1957 states and 2610 transitions. [2022-11-19 07:21:31,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-19 07:21:31,423 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 24 states have internal predecessors, (62), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 13 states have call predecessors, (36), 13 states have call successors, (36) Word has length 110 [2022-11-19 07:21:31,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:21:31,431 INFO L225 Difference]: With dead ends: 1957 [2022-11-19 07:21:31,431 INFO L226 Difference]: Without dead ends: 1953 [2022-11-19 07:21:31,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 280 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1922 ImplicationChecksByTransitivity, 29.2s TimeCoverageRelationStatistics Valid=858, Invalid=5462, Unknown=0, NotChecked=0, Total=6320 [2022-11-19 07:21:31,434 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 267 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 1326 mSolverCounterSat, 341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 1667 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 341 IncrementalHoareTripleChecker+Valid, 1326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:21:31,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [269 Valid, 369 Invalid, 1667 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [341 Valid, 1326 Invalid, 0 Unknown, 0 Unchecked, 13.5s Time] [2022-11-19 07:21:31,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1953 states. [2022-11-19 07:21:32,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1953 to 1837. [2022-11-19 07:21:32,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1837 states, 1145 states have (on average 1.1965065502183405) internal successors, (1370), 1166 states have internal predecessors, (1370), 535 states have call successors, (535), 157 states have call predecessors, (535), 156 states have return successors, (526), 513 states have call predecessors, (526), 526 states have call successors, (526) [2022-11-19 07:21:32,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1837 states to 1837 states and 2431 transitions. [2022-11-19 07:21:32,686 INFO L78 Accepts]: Start accepts. Automaton has 1837 states and 2431 transitions. Word has length 110 [2022-11-19 07:21:32,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:21:32,686 INFO L495 AbstractCegarLoop]: Abstraction has 1837 states and 2431 transitions. [2022-11-19 07:21:32,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 24 states have internal predecessors, (62), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 13 states have call predecessors, (36), 13 states have call successors, (36) [2022-11-19 07:21:32,687 INFO L276 IsEmpty]: Start isEmpty. Operand 1837 states and 2431 transitions. [2022-11-19 07:21:32,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-19 07:21:32,689 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:21:32,689 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:21:32,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 07:21:32,895 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:21:32,895 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:21:32,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:21:32,895 INFO L85 PathProgramCache]: Analyzing trace with hash -600095698, now seen corresponding path program 3 times [2022-11-19 07:21:32,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:21:32,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310154111] [2022-11-19 07:21:32,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:21:32,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:21:32,905 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:21:32,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1121768447] [2022-11-19 07:21:32,906 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:21:32,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:21:32,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:21:32,907 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:21:32,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 07:21:32,995 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:21:32,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:21:32,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-19 07:21:32,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:21:34,044 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 32 proven. 55 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2022-11-19 07:21:34,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:21:36,824 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 32 proven. 52 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2022-11-19 07:21:36,824 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:21:36,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310154111] [2022-11-19 07:21:36,825 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:21:36,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1121768447] [2022-11-19 07:21:36,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1121768447] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:21:36,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [55005733] [2022-11-19 07:21:36,827 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-19 07:21:36,827 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:21:36,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:21:36,827 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:21:36,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:21:47,486 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-11-19 07:21:47,490 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:21:47,508 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:21:55,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31343#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-19 07:21:55,297 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:21:55,297 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:21:55,298 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 27 [2022-11-19 07:21:55,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044794151] [2022-11-19 07:21:55,298 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:21:55,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-19 07:21:55,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:21:55,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-19 07:21:55,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1923, Unknown=0, NotChecked=0, Total=2162 [2022-11-19 07:21:55,300 INFO L87 Difference]: Start difference. First operand 1837 states and 2431 transitions. Second operand has 27 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 24 states have internal predecessors, (59), 14 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) [2022-11-19 07:23:08,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:23:08,290 INFO L93 Difference]: Finished difference Result 2196 states and 2931 transitions. [2022-11-19 07:23:08,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-19 07:23:08,291 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 24 states have internal predecessors, (59), 14 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) Word has length 121 [2022-11-19 07:23:08,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:23:08,301 INFO L225 Difference]: With dead ends: 2196 [2022-11-19 07:23:08,301 INFO L226 Difference]: Without dead ends: 2161 [2022-11-19 07:23:08,304 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 315 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3379 ImplicationChecksByTransitivity, 50.9s TimeCoverageRelationStatistics Valid=1432, Invalid=8870, Unknown=0, NotChecked=0, Total=10302 [2022-11-19 07:23:08,305 INFO L413 NwaCegarLoop]: 154 mSDtfsCounter, 406 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 2063 mSolverCounterSat, 586 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 414 SdHoareTripleChecker+Valid, 1148 SdHoareTripleChecker+Invalid, 2649 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 586 IncrementalHoareTripleChecker+Valid, 2063 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:23:08,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [414 Valid, 1148 Invalid, 2649 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [586 Valid, 2063 Invalid, 0 Unknown, 0 Unchecked, 30.4s Time] [2022-11-19 07:23:08,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2161 states. [2022-11-19 07:23:09,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2161 to 2008. [2022-11-19 07:23:09,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2008 states, 1252 states have (on average 1.1956869009584665) internal successors, (1497), 1272 states have internal predecessors, (1497), 583 states have call successors, (583), 173 states have call predecessors, (583), 172 states have return successors, (574), 562 states have call predecessors, (574), 574 states have call successors, (574) [2022-11-19 07:23:09,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2008 states to 2008 states and 2654 transitions. [2022-11-19 07:23:09,625 INFO L78 Accepts]: Start accepts. Automaton has 2008 states and 2654 transitions. Word has length 121 [2022-11-19 07:23:09,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:23:09,626 INFO L495 AbstractCegarLoop]: Abstraction has 2008 states and 2654 transitions. [2022-11-19 07:23:09,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 24 states have internal predecessors, (59), 14 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) [2022-11-19 07:23:09,626 INFO L276 IsEmpty]: Start isEmpty. Operand 2008 states and 2654 transitions. [2022-11-19 07:23:09,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-11-19 07:23:09,629 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:23:09,629 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:23:09,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-19 07:23:09,835 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:23:09,835 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:23:09,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:23:09,835 INFO L85 PathProgramCache]: Analyzing trace with hash -1584885405, now seen corresponding path program 4 times [2022-11-19 07:23:09,835 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:23:09,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497000713] [2022-11-19 07:23:09,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:23:09,836 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:23:09,846 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:23:09,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1588968712] [2022-11-19 07:23:09,848 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:23:09,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:23:09,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:23:09,850 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:23:09,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 07:23:11,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:23:11,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-19 07:23:11,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:23:26,071 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 131 proven. 89 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2022-11-19 07:23:26,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:23:49,792 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:23:49,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497000713] [2022-11-19 07:23:49,793 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:23:49,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588968712] [2022-11-19 07:23:49,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1588968712] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:23:49,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [910968047] [2022-11-19 07:23:49,795 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 07:23:49,795 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:23:49,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:23:49,796 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:23:49,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:24:03,222 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2022-11-19 07:24:03,227 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:24:03,246 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:24:23,097 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38498#(and (<= ~counter~0 101) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-19 07:24:23,097 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:24:23,097 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-19 07:24:23,097 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-11-19 07:24:23,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045263035] [2022-11-19 07:24:23,098 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-19 07:24:23,098 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 07:24:23,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:24:23,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 07:24:23,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=2284, Unknown=7, NotChecked=0, Total=2652 [2022-11-19 07:24:23,100 INFO L87 Difference]: Start difference. First operand 2008 states and 2654 transitions. Second operand has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 9 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 9 states have call predecessors, (23), 9 states have call successors, (23) [2022-11-19 07:24:30,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:24:30,140 INFO L93 Difference]: Finished difference Result 2085 states and 2714 transitions. [2022-11-19 07:24:30,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-19 07:24:30,141 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 9 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 9 states have call predecessors, (23), 9 states have call successors, (23) Word has length 138 [2022-11-19 07:24:30,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:24:30,152 INFO L225 Difference]: With dead ends: 2085 [2022-11-19 07:24:30,152 INFO L226 Difference]: Without dead ends: 2081 [2022-11-19 07:24:30,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 323 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1211 ImplicationChecksByTransitivity, 40.4s TimeCoverageRelationStatistics Valid=489, Invalid=3164, Unknown=7, NotChecked=0, Total=3660 [2022-11-19 07:24:30,156 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 88 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 965 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 1045 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 965 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:24:30,157 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 330 Invalid, 1045 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 965 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-11-19 07:24:30,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2081 states. [2022-11-19 07:24:32,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2081 to 2071. [2022-11-19 07:24:32,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2071 states, 1300 states have (on average 1.1876923076923076) internal successors, (1544), 1319 states have internal predecessors, (1544), 582 states have call successors, (582), 189 states have call predecessors, (582), 188 states have return successors, (574), 562 states have call predecessors, (574), 574 states have call successors, (574) [2022-11-19 07:24:32,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2071 states to 2071 states and 2700 transitions. [2022-11-19 07:24:32,231 INFO L78 Accepts]: Start accepts. Automaton has 2071 states and 2700 transitions. Word has length 138 [2022-11-19 07:24:32,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:24:32,232 INFO L495 AbstractCegarLoop]: Abstraction has 2071 states and 2700 transitions. [2022-11-19 07:24:32,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 9 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 9 states have call predecessors, (23), 9 states have call successors, (23) [2022-11-19 07:24:32,232 INFO L276 IsEmpty]: Start isEmpty. Operand 2071 states and 2700 transitions. [2022-11-19 07:24:32,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-11-19 07:24:32,235 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:24:32,235 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:24:32,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-19 07:24:32,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:24:32,446 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:24:32,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:24:32,447 INFO L85 PathProgramCache]: Analyzing trace with hash 393851770, now seen corresponding path program 4 times [2022-11-19 07:24:32,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:24:32,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080662561] [2022-11-19 07:24:32,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:24:32,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:24:32,461 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:24:32,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [109717000] [2022-11-19 07:24:32,461 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:24:32,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:24:32,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:24:32,463 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:24:32,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 07:24:32,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:24:32,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 55 conjunts are in the unsatisfiable core [2022-11-19 07:24:32,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:24:34,019 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 40 proven. 76 refuted. 0 times theorem prover too weak. 769 trivial. 0 not checked. [2022-11-19 07:24:34,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:24:43,403 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 40 proven. 73 refuted. 0 times theorem prover too weak. 772 trivial. 0 not checked. [2022-11-19 07:24:43,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:24:43,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080662561] [2022-11-19 07:24:43,404 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:24:43,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109717000] [2022-11-19 07:24:43,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109717000] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:24:43,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501830558] [2022-11-19 07:24:43,406 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-19 07:24:43,406 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:24:43,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:24:43,407 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:24:43,407 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:24:55,666 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-11-19 07:24:55,670 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:24:55,689 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:25:04,119 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45558#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-19 07:25:04,119 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:25:04,119 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:25:04,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-19 07:25:04,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341360835] [2022-11-19 07:25:04,120 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:25:04,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 07:25:04,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:25:04,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 07:25:04,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=1832, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 07:25:04,122 INFO L87 Difference]: Start difference. First operand 2071 states and 2700 transitions. Second operand has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) [2022-11-19 07:26:22,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:26:22,295 INFO L93 Difference]: Finished difference Result 2230 states and 2907 transitions. [2022-11-19 07:26:22,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-19 07:26:22,299 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) Word has length 140 [2022-11-19 07:26:22,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:26:22,305 INFO L225 Difference]: With dead ends: 2230 [2022-11-19 07:26:22,305 INFO L226 Difference]: Without dead ends: 2199 [2022-11-19 07:26:22,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 374 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2034 ImplicationChecksByTransitivity, 46.0s TimeCoverageRelationStatistics Valid=967, Invalid=6173, Unknown=0, NotChecked=0, Total=7140 [2022-11-19 07:26:22,308 INFO L413 NwaCegarLoop]: 147 mSDtfsCounter, 256 mSDsluCounter, 848 mSDsCounter, 0 mSdLazyCounter, 2151 mSolverCounterSat, 427 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 40.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 995 SdHoareTripleChecker+Invalid, 2578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 427 IncrementalHoareTripleChecker+Valid, 2151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 41.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:26:22,309 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [260 Valid, 995 Invalid, 2578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [427 Valid, 2151 Invalid, 0 Unknown, 0 Unchecked, 41.1s Time] [2022-11-19 07:26:22,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2199 states. [2022-11-19 07:26:23,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2199 to 2140. [2022-11-19 07:26:23,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2140 states, 1340 states have (on average 1.1835820895522389) internal successors, (1586), 1359 states have internal predecessors, (1586), 605 states have call successors, (605), 194 states have call predecessors, (605), 194 states have return successors, (598), 586 states have call predecessors, (598), 598 states have call successors, (598) [2022-11-19 07:26:23,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2140 states to 2140 states and 2789 transitions. [2022-11-19 07:26:23,914 INFO L78 Accepts]: Start accepts. Automaton has 2140 states and 2789 transitions. Word has length 140 [2022-11-19 07:26:23,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:26:23,914 INFO L495 AbstractCegarLoop]: Abstraction has 2140 states and 2789 transitions. [2022-11-19 07:26:23,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) [2022-11-19 07:26:23,915 INFO L276 IsEmpty]: Start isEmpty. Operand 2140 states and 2789 transitions. [2022-11-19 07:26:23,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-11-19 07:26:23,917 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:26:23,917 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:26:23,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-19 07:26:24,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:26:24,128 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:26:24,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:26:24,129 INFO L85 PathProgramCache]: Analyzing trace with hash 408986690, now seen corresponding path program 2 times [2022-11-19 07:26:24,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:26:24,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489135327] [2022-11-19 07:26:24,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:26:24,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:26:24,150 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:26:24,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [678790975] [2022-11-19 07:26:24,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:26:24,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:26:24,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:26:24,152 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:26:24,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-19 07:26:24,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 07:26:24,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:26:24,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-19 07:26:24,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:26:24,488 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 40 proven. 728 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-11-19 07:26:24,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:26:24,748 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 40 proven. 88 refuted. 0 times theorem prover too weak. 772 trivial. 0 not checked. [2022-11-19 07:26:24,749 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:26:24,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489135327] [2022-11-19 07:26:24,749 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:26:24,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678790975] [2022-11-19 07:26:24,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678790975] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:26:24,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1451721255] [2022-11-19 07:26:24,751 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-19 07:26:24,751 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:26:24,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:26:24,751 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:26:24,751 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:26:37,480 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-11-19 07:26:37,484 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:26:37,499 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:26:41,859 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53045#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-19 07:26:41,859 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:26:41,859 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:26:41,860 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-11-19 07:26:41,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700598759] [2022-11-19 07:26:41,860 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:26:41,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 07:26:41,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:26:41,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 07:26:41,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=1228, Unknown=0, NotChecked=0, Total=1640 [2022-11-19 07:26:41,862 INFO L87 Difference]: Start difference. First operand 2140 states and 2789 transitions. Second operand has 22 states, 22 states have (on average 3.8636363636363638) internal successors, (85), 22 states have internal predecessors, (85), 13 states have call successors, (49), 8 states have call predecessors, (49), 7 states have return successors, (48), 12 states have call predecessors, (48), 12 states have call successors, (48) [2022-11-19 07:26:45,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:26:45,254 INFO L93 Difference]: Finished difference Result 3273 states and 4358 transitions. [2022-11-19 07:26:45,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-19 07:26:45,254 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.8636363636363638) internal successors, (85), 22 states have internal predecessors, (85), 13 states have call successors, (49), 8 states have call predecessors, (49), 7 states have return successors, (48), 12 states have call predecessors, (48), 12 states have call successors, (48) Word has length 147 [2022-11-19 07:26:45,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:26:45,283 INFO L225 Difference]: With dead ends: 3273 [2022-11-19 07:26:45,283 INFO L226 Difference]: Without dead ends: 3239 [2022-11-19 07:26:45,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 400 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1117 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=725, Invalid=2467, Unknown=0, NotChecked=0, Total=3192 [2022-11-19 07:26:45,286 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 471 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 322 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 471 SdHoareTripleChecker+Valid, 531 SdHoareTripleChecker+Invalid, 696 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 322 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:26:45,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [471 Valid, 531 Invalid, 696 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [322 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:26:45,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3239 states. [2022-11-19 07:26:47,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3239 to 3178. [2022-11-19 07:26:47,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3178 states, 1979 states have (on average 1.182920667003537) internal successors, (2341), 2017 states have internal predecessors, (2341), 924 states have call successors, (924), 274 states have call predecessors, (924), 274 states have return successors, (911), 886 states have call predecessors, (911), 911 states have call successors, (911) [2022-11-19 07:26:47,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3178 states to 3178 states and 4176 transitions. [2022-11-19 07:26:47,612 INFO L78 Accepts]: Start accepts. Automaton has 3178 states and 4176 transitions. Word has length 147 [2022-11-19 07:26:47,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:26:47,613 INFO L495 AbstractCegarLoop]: Abstraction has 3178 states and 4176 transitions. [2022-11-19 07:26:47,613 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.8636363636363638) internal successors, (85), 22 states have internal predecessors, (85), 13 states have call successors, (49), 8 states have call predecessors, (49), 7 states have return successors, (48), 12 states have call predecessors, (48), 12 states have call successors, (48) [2022-11-19 07:26:47,613 INFO L276 IsEmpty]: Start isEmpty. Operand 3178 states and 4176 transitions. [2022-11-19 07:26:47,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-11-19 07:26:47,615 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:26:47,616 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:26:47,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-19 07:26:47,823 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-19 07:26:47,824 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:26:47,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:26:47,824 INFO L85 PathProgramCache]: Analyzing trace with hash 526567797, now seen corresponding path program 5 times [2022-11-19 07:26:47,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:26:47,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097245349] [2022-11-19 07:26:47,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:26:47,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:26:47,835 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:26:47,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1833836878] [2022-11-19 07:26:47,835 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:26:47,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:26:47,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:26:47,837 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:26:47,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ff869a4-9dc8-4b16-9744-43d156085ad7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-19 07:26:48,475 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 07:26:48,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:26:48,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 90 conjunts are in the unsatisfiable core [2022-11-19 07:26:48,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:26:55,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 166 proven. 98 refuted. 0 times theorem prover too weak. 916 trivial. 0 not checked. [2022-11-19 07:26:55,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:27:01,970 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:27:01,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097245349] [2022-11-19 07:27:01,970 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:27:01,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833836878] [2022-11-19 07:27:01,971 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833836878] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:27:01,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [298185826] [2022-11-19 07:27:01,973 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 07:27:01,973 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:27:01,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:27:01,973 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:27:01,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:27:16,372 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2022-11-19 07:27:16,377 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-19 07:27:16,397 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:29:11,555 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '63433#(and (<= ~counter~0 101) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-19 07:29:11,555 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:29:11,555 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-19 07:29:11,555 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-11-19 07:29:11,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136598639] [2022-11-19 07:29:11,555 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-19 07:29:11,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 07:29:11,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:29:11,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 07:29:11,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=2106, Unknown=4, NotChecked=0, Total=2450 [2022-11-19 07:29:11,557 INFO L87 Difference]: Start difference. First operand 3178 states and 4176 transitions. Second operand has 20 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 9 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 7 states have call predecessors, (19), 9 states have call successors, (19)