./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a 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_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur --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 776d32abf1ae3b62e7ad4a02cd7c02c0cc6433852a1fe73b7d30c6e216da832a --- 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-38b53e6 [2022-11-25 23:45:42,861 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:45:42,864 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:45:42,888 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:45:42,888 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:45:42,889 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:45:42,891 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:45:42,893 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:45:42,895 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:45:42,896 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:45:42,897 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:45:42,899 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:45:42,899 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:45:42,900 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:45:42,902 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:45:42,903 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:45:42,905 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:45:42,906 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:45:42,908 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:45:42,910 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:45:42,912 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:45:42,914 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:45:42,915 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:45:42,916 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:45:42,924 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:45:42,924 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:45:42,925 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:45:42,926 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:45:42,926 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:45:42,927 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:45:42,928 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:45:42,928 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:45:42,929 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:45:42,930 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:45:42,931 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:45:42,932 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:45:42,933 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:45:42,933 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:45:42,933 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:45:42,934 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:45:42,935 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:45:42,937 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 23:45:42,959 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:45:42,959 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:45:42,960 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:45:42,960 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:45:42,961 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:45:42,961 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:45:42,961 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:45:42,961 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:45:42,962 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:45:42,962 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:45:42,962 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:45:42,962 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:45:42,963 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:45:42,963 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:45:42,963 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:45:42,963 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:45:42,963 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:45:42,964 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:45:42,964 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:45:42,965 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:45:42,965 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:45:42,965 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:45:42,965 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:45:42,965 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 23:45:42,966 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:45:42,966 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 23:45:42,966 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:45:42,966 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 23:45:42,966 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:45:42,967 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 23:45:42,967 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:45:42,967 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:45:42,967 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:45:42,968 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:45:42,968 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:45:42,968 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:45:42,968 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 23:45:42,968 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:45:42,969 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:45:42,969 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 23:45:42,969 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:45:42,969 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_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 776d32abf1ae3b62e7ad4a02cd7c02c0cc6433852a1fe73b7d30c6e216da832a [2022-11-25 23:45:43,274 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:45:43,301 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:45:43,304 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:45:43,305 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:45:43,306 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:45:43,307 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c [2022-11-25 23:45:46,387 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:45:46,610 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:45:46,611 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c [2022-11-25 23:45:46,620 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/data/2860dbced/4c1fbcf55a264661aa0427ae707dfaa2/FLAG4be17290c [2022-11-25 23:45:46,646 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/data/2860dbced/4c1fbcf55a264661aa0427ae707dfaa2 [2022-11-25 23:45:46,651 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:45:46,653 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:45:46,658 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:45:46,658 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:45:46,662 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:45:46,663 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:46,666 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56d4a5ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46, skipping insertion in model container [2022-11-25 23:45:46,666 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:46,675 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:45:46,745 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:45:46,928 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c[490,503] [2022-11-25 23:45:46,948 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:45:46,957 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:45:46,968 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c[490,503] [2022-11-25 23:45:46,977 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:45:46,990 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:45:46,991 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46 WrapperNode [2022-11-25 23:45:46,991 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:45:46,992 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:45:46,992 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:45:46,992 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:45:47,000 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,008 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,026 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2022-11-25 23:45:47,026 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:45:47,027 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:45:47,027 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:45:47,028 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:45:47,037 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,038 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,039 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,039 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,043 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,047 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,048 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,049 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,050 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:45:47,051 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:45:47,052 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:45:47,052 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:45:47,053 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (1/1) ... [2022-11-25 23:45:47,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:45:47,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:47,088 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:45:47,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:45:47,135 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:45:47,135 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-25 23:45:47,135 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-25 23:45:47,136 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:45:47,136 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:45:47,136 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:45:47,136 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-25 23:45:47,137 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-25 23:45:47,210 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:45:47,213 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:45:47,408 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:45:47,434 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:45:47,434 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-25 23:45:47,438 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:45:47 BoogieIcfgContainer [2022-11-25 23:45:47,438 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:45:47,441 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:45:47,441 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:45:47,445 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:45:47,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:45:46" (1/3) ... [2022-11-25 23:45:47,446 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@375fbdb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:45:47, skipping insertion in model container [2022-11-25 23:45:47,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:45:46" (2/3) ... [2022-11-25 23:45:47,447 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@375fbdb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:45:47, skipping insertion in model container [2022-11-25 23:45:47,447 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:45:47" (3/3) ... [2022-11-25 23:45:47,448 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound10.c [2022-11-25 23:45:47,469 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:45:47,469 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 23:45:47,538 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:45:47,548 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;@2fe8dfcb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:45:47,549 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 23:45:47,553 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-25 23:45:47,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-25 23:45:47,561 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:47,562 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:45:47,566 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:47,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:47,573 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2022-11-25 23:45:47,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:47,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45749002] [2022-11-25 23:45:47,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:47,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:47,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:47,787 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:47,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45749002] [2022-11-25 23:45:47,795 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-25 23:45:47,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107468537] [2022-11-25 23:45:47,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:47,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:47,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:47,811 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:47,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:45:47,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:47,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-25 23:45:47,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:47,988 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 23:45:47,989 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:45:47,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107468537] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:45:47,990 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:45:47,990 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:45:47,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201895055] [2022-11-25 23:45:47,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:45:47,997 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-25 23:45:47,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:48,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-25 23:45:48,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 23:45:48,049 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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) [2022-11-25 23:45:48,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:48,099 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2022-11-25 23:45:48,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-25 23:45:48,101 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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 [2022-11-25 23:45:48,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:48,110 INFO L225 Difference]: With dead ends: 51 [2022-11-25 23:45:48,110 INFO L226 Difference]: Without dead ends: 28 [2022-11-25 23:45:48,113 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 23:45:48,117 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:48,119 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:45:48,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-25 23:45:48,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-25 23:45:48,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-25 23:45:48,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2022-11-25 23:45:48,153 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2022-11-25 23:45:48,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:48,155 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2022-11-25 23:45:48,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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) [2022-11-25 23:45:48,156 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2022-11-25 23:45:48,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-25 23:45:48,157 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:48,158 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:45:48,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 23:45:48,363 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:48,364 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:48,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:48,365 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2022-11-25 23:45:48,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:48,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414906110] [2022-11-25 23:45:48,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:48,366 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:48,406 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:45:48,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [644387461] [2022-11-25 23:45:48,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:48,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:48,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:48,410 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:48,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:45:48,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:48,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 23:45:48,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:48,594 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 23:45:48,594 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:45:48,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:48,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414906110] [2022-11-25 23:45:48,595 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:45:48,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644387461] [2022-11-25 23:45:48,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [644387461] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:45:48,596 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:45:48,596 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-25 23:45:48,596 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365543172] [2022-11-25 23:45:48,596 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:45:48,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:45:48,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:48,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:45:48,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:45:48,599 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-25 23:45:48,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:48,708 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-11-25 23:45:48,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 23:45:48,709 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2022-11-25 23:45:48,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:48,711 INFO L225 Difference]: With dead ends: 47 [2022-11-25 23:45:48,711 INFO L226 Difference]: Without dead ends: 40 [2022-11-25 23:45:48,711 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-25 23:45:48,713 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 30 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:48,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 78 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:45:48,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-25 23:45:48,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2022-11-25 23:45:48,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-25 23:45:48,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-11-25 23:45:48,728 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2022-11-25 23:45:48,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:48,729 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-11-25 23:45:48,729 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-25 23:45:48,729 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-11-25 23:45:48,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-25 23:45:48,730 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:48,731 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, 1] [2022-11-25 23:45:48,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-25 23:45:48,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:48,940 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:48,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:48,941 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2022-11-25 23:45:48,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:48,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153434251] [2022-11-25 23:45:48,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:48,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:48,961 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:45:48,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1470551519] [2022-11-25 23:45:48,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:48,962 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:48,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:48,964 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:48,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:45:49,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:49,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-25 23:45:49,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:49,219 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 23:45:49,220 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:45:49,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:49,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153434251] [2022-11-25 23:45:49,220 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:45:49,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470551519] [2022-11-25 23:45:49,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470551519] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:45:49,221 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:45:49,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-25 23:45:49,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606629789] [2022-11-25 23:45:49,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:45:49,222 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 23:45:49,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:49,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 23:45:49,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-25 23:45:49,224 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-25 23:45:49,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:49,333 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-11-25 23:45:49,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 23:45:49,334 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2022-11-25 23:45:49,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:49,335 INFO L225 Difference]: With dead ends: 46 [2022-11-25 23:45:49,335 INFO L226 Difference]: Without dead ends: 44 [2022-11-25 23:45:49,335 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-25 23:45:49,337 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 25 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:49,337 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 114 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:45:49,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-25 23:45:49,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-11-25 23:45:49,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-25 23:45:49,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2022-11-25 23:45:49,349 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2022-11-25 23:45:49,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:49,350 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2022-11-25 23:45:49,350 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-25 23:45:49,350 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2022-11-25 23:45:49,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-25 23:45:49,351 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:49,351 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] [2022-11-25 23:45:49,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 23:45:49,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:49,557 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:49,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:49,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2022-11-25 23:45:49,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:49,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732472841] [2022-11-25 23:45:49,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:49,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:49,606 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:45:49,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [969787969] [2022-11-25 23:45:49,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:49,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:49,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:49,626 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:49,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:45:49,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:49,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-25 23:45:49,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:49,780 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 23:45:49,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:45:49,906 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 23:45:49,906 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:49,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732472841] [2022-11-25 23:45:49,907 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:45:49,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969787969] [2022-11-25 23:45:49,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969787969] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:45:49,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [501591963] [2022-11-25 23:45:49,932 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-25 23:45:49,932 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:45:49,937 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:45:49,942 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:45:49,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:45:50,798 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:45:50,829 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:45:52,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [501591963] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:45:52,869 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:45:52,869 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2022-11-25 23:45:52,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565147392] [2022-11-25 23:45:52,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:45:52,870 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-25 23:45:52,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:52,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-25 23:45:52,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-25 23:45:52,872 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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) [2022-11-25 23:45:53,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:53,218 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2022-11-25 23:45:53,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 23:45:53,219 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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 26 [2022-11-25 23:45:53,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:53,223 INFO L225 Difference]: With dead ends: 71 [2022-11-25 23:45:53,223 INFO L226 Difference]: Without dead ends: 64 [2022-11-25 23:45:53,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-25 23:45:53,230 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 41 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:53,231 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 58 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:45:53,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-25 23:45:53,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2022-11-25 23:45:53,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-25 23:45:53,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2022-11-25 23:45:53,264 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2022-11-25 23:45:53,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:53,264 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2022-11-25 23:45:53,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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) [2022-11-25 23:45:53,264 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2022-11-25 23:45:53,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-25 23:45:53,265 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:53,266 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, 1] [2022-11-25 23:45:53,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 23:45:53,466 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:53,467 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:53,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:53,467 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2022-11-25 23:45:53,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:53,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104664192] [2022-11-25 23:45:53,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:53,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:53,490 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:45:53,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [982554659] [2022-11-25 23:45:53,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:53,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:53,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:53,495 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:53,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:45:53,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:53,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-25 23:45:53,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:53,625 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 23:45:53,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:45:53,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:53,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104664192] [2022-11-25 23:45:53,710 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:45:53,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982554659] [2022-11-25 23:45:53,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982554659] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:45:53,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [240706913] [2022-11-25 23:45:53,714 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-25 23:45:53,715 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:45:53,715 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:45:53,716 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:45:53,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:45:54,158 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-25 23:45:54,168 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:45:54,187 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:45:55,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [240706913] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:45:55,592 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:45:55,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [7] total 20 [2022-11-25 23:45:55,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316935562] [2022-11-25 23:45:55,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:45:55,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-25 23:45:55,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:55,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-25 23:45:55,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-25 23:45:55,595 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-25 23:45:56,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:56,042 INFO L93 Difference]: Finished difference Result 72 states and 97 transitions. [2022-11-25 23:45:56,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-25 23:45:56,042 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 29 [2022-11-25 23:45:56,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:56,044 INFO L225 Difference]: With dead ends: 72 [2022-11-25 23:45:56,044 INFO L226 Difference]: Without dead ends: 70 [2022-11-25 23:45:56,044 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-25 23:45:56,045 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 74 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:56,046 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 57 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:45:56,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-25 23:45:56,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 65. [2022-11-25 23:45:56,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 21 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-25 23:45:56,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2022-11-25 23:45:56,081 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 29 [2022-11-25 23:45:56,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:56,081 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2022-11-25 23:45:56,082 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-25 23:45:56,082 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2022-11-25 23:45:56,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-25 23:45:56,083 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:56,083 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:45:56,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 23:45:56,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:56,289 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:56,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:56,290 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2022-11-25 23:45:56,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:56,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051444505] [2022-11-25 23:45:56,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:56,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:56,301 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:45:56,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [863487603] [2022-11-25 23:45:56,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:56,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:56,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:56,303 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:56,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:45:56,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:56,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-25 23:45:56,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:56,502 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 23:45:56,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:45:56,682 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 23:45:56,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:56,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051444505] [2022-11-25 23:45:56,682 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:45:56,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863487603] [2022-11-25 23:45:56,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [863487603] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:45:56,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1100428394] [2022-11-25 23:45:56,691 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-25 23:45:56,692 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:45:56,694 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:45:56,694 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:45:56,695 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:45:57,419 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-25 23:45:57,425 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:45:57,441 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:45:59,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1100428394] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:45:59,748 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:45:59,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [8, 6] total 26 [2022-11-25 23:45:59,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503143652] [2022-11-25 23:45:59,749 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:45:59,749 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-25 23:45:59,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:59,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-25 23:45:59,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-25 23:45:59,751 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 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) [2022-11-25 23:46:00,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:00,245 INFO L93 Difference]: Finished difference Result 96 states and 128 transitions. [2022-11-25 23:46:00,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-25 23:46:00,246 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 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 29 [2022-11-25 23:46:00,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:00,247 INFO L225 Difference]: With dead ends: 96 [2022-11-25 23:46:00,247 INFO L226 Difference]: Without dead ends: 94 [2022-11-25 23:46:00,248 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-25 23:46:00,249 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 55 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:00,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 56 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:46:00,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-25 23:46:00,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-11-25 23:46:00,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 51 states have (on average 1.196078431372549) internal successors, (61), 54 states have internal predecessors, (61), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2022-11-25 23:46:00,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 118 transitions. [2022-11-25 23:46:00,291 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 118 transitions. Word has length 29 [2022-11-25 23:46:00,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:00,292 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 118 transitions. [2022-11-25 23:46:00,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 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) [2022-11-25 23:46:00,292 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 118 transitions. [2022-11-25 23:46:00,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-25 23:46:00,294 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:00,294 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, 1, 1] [2022-11-25 23:46:00,304 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-25 23:46:00,499 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-25 23:46:00,499 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:00,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:00,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2022-11-25 23:46:00,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:00,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284132897] [2022-11-25 23:46:00,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:00,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:00,513 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:46:00,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1463567935] [2022-11-25 23:46:00,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:00,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:00,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:00,515 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:00,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:46:00,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:00,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-25 23:46:00,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:01,586 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:46:01,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:02,793 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-25 23:46:02,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:02,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284132897] [2022-11-25 23:46:02,793 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:46:02,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1463567935] [2022-11-25 23:46:02,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1463567935] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:02,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [766252193] [2022-11-25 23:46:02,796 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-25 23:46:02,796 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:02,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:02,797 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:02,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:11,694 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-25 23:46:11,697 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:46:11,710 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:23,675 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2087#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:23,675 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:23,675 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:46:23,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 26 [2022-11-25 23:46:23,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602774609] [2022-11-25 23:46:23,675 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:23,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 23:46:23,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:23,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 23:46:23,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1853, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 23:46:23,679 INFO L87 Difference]: Start difference. First operand 88 states and 118 transitions. Second operand has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-25 23:46:38,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:38,903 INFO L93 Difference]: Finished difference Result 218 states and 311 transitions. [2022-11-25 23:46:38,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-25 23:46:38,904 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) Word has length 51 [2022-11-25 23:46:38,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:38,908 INFO L225 Difference]: With dead ends: 218 [2022-11-25 23:46:38,908 INFO L226 Difference]: Without dead ends: 180 [2022-11-25 23:46:38,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1517 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=554, Invalid=4276, Unknown=0, NotChecked=0, Total=4830 [2022-11-25 23:46:38,911 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 137 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 1498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:38,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [151 Valid, 196 Invalid, 1498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 6.4s Time] [2022-11-25 23:46:38,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-11-25 23:46:39,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 137. [2022-11-25 23:46:39,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 87 states have (on average 1.2413793103448276) internal successors, (108), 88 states have internal predecessors, (108), 41 states have call successors, (41), 8 states have call predecessors, (41), 8 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2022-11-25 23:46:39,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 189 transitions. [2022-11-25 23:46:39,019 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 189 transitions. Word has length 51 [2022-11-25 23:46:39,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:39,020 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 189 transitions. [2022-11-25 23:46:39,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-25 23:46:39,020 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 189 transitions. [2022-11-25 23:46:39,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-25 23:46:39,022 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:39,022 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:39,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:39,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:39,229 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:39,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:39,229 INFO L85 PathProgramCache]: Analyzing trace with hash -900294476, now seen corresponding path program 1 times [2022-11-25 23:46:39,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:39,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26655488] [2022-11-25 23:46:39,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:39,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:39,263 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:46:39,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [332392862] [2022-11-25 23:46:39,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:39,263 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:39,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:39,266 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:39,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 23:46:39,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:39,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 23:46:39,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:39,371 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-25 23:46:39,372 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:46:39,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:39,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26655488] [2022-11-25 23:46:39,372 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:46:39,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332392862] [2022-11-25 23:46:39,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332392862] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:46:39,373 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:46:39,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-25 23:46:39,373 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582021207] [2022-11-25 23:46:39,375 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:46:39,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:46:39,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:39,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:46:39,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:46:39,379 INFO L87 Difference]: Start difference. First operand 137 states and 189 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-25 23:46:39,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:39,553 INFO L93 Difference]: Finished difference Result 229 states and 321 transitions. [2022-11-25 23:46:39,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:46:39,554 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2022-11-25 23:46:39,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:39,560 INFO L225 Difference]: With dead ends: 229 [2022-11-25 23:46:39,560 INFO L226 Difference]: Without dead ends: 166 [2022-11-25 23:46:39,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-25 23:46:39,565 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 3 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:39,567 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 84 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:46:39,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-11-25 23:46:39,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 155. [2022-11-25 23:46:39,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 93 states have (on average 1.2365591397849462) internal successors, (115), 94 states have internal predecessors, (115), 53 states have call successors, (53), 8 states have call predecessors, (53), 8 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-25 23:46:39,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 220 transitions. [2022-11-25 23:46:39,699 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 220 transitions. Word has length 54 [2022-11-25 23:46:39,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:39,699 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 220 transitions. [2022-11-25 23:46:39,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-25 23:46:39,700 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 220 transitions. [2022-11-25 23:46:39,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-25 23:46:39,713 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:39,713 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 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] [2022-11-25 23:46:39,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:39,926 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:39,927 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:39,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:39,927 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2022-11-25 23:46:39,927 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:39,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89276343] [2022-11-25 23:46:39,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:39,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:39,939 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:46:39,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [270624521] [2022-11-25 23:46:39,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:39,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:39,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:39,943 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:39,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 23:46:40,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:40,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-25 23:46:40,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:40,178 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 25 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-25 23:46:40,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:40,320 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-25 23:46:40,320 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:40,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89276343] [2022-11-25 23:46:40,321 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:46:40,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270624521] [2022-11-25 23:46:40,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270624521] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:40,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [488281971] [2022-11-25 23:46:40,324 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-25 23:46:40,324 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:40,324 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:40,325 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:40,325 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:46,738 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-25 23:46:46,742 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:46:46,756 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:48,708 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3853#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:48,708 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:48,709 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:46:48,709 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 14 [2022-11-25 23:46:48,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949854766] [2022-11-25 23:46:48,709 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:48,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 23:46:48,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:48,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 23:46:48,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2022-11-25 23:46:48,711 INFO L87 Difference]: Start difference. First operand 155 states and 220 transitions. Second operand has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-25 23:46:49,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:49,368 INFO L93 Difference]: Finished difference Result 198 states and 272 transitions. [2022-11-25 23:46:49,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 23:46:49,369 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) Word has length 61 [2022-11-25 23:46:49,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:49,371 INFO L225 Difference]: With dead ends: 198 [2022-11-25 23:46:49,371 INFO L226 Difference]: Without dead ends: 196 [2022-11-25 23:46:49,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 148 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=180, Invalid=1152, Unknown=0, NotChecked=0, Total=1332 [2022-11-25 23:46:49,373 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 59 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:49,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 111 Invalid, 387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:46:49,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-25 23:46:49,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 167. [2022-11-25 23:46:49,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 102 states have (on average 1.2156862745098038) internal successors, (124), 103 states have internal predecessors, (124), 53 states have call successors, (53), 11 states have call predecessors, (53), 11 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-25 23:46:49,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 229 transitions. [2022-11-25 23:46:49,497 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 229 transitions. Word has length 61 [2022-11-25 23:46:49,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:49,498 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 229 transitions. [2022-11-25 23:46:49,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-25 23:46:49,498 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 229 transitions. [2022-11-25 23:46:49,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-25 23:46:49,500 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:49,500 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:49,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:49,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-25 23:46:49,711 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:49,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:49,712 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 2 times [2022-11-25 23:46:49,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:49,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361189320] [2022-11-25 23:46:49,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:49,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:49,720 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:46:49,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [750877189] [2022-11-25 23:46:49,720 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:46:49,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:49,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:49,722 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:49,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 23:46:49,787 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:46:49,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:46:49,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-25 23:46:49,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:50,371 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-25 23:46:50,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:50,956 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:46:50,956 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:50,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361189320] [2022-11-25 23:46:50,956 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:46:50,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [750877189] [2022-11-25 23:46:50,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [750877189] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:50,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2048473740] [2022-11-25 23:46:50,959 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-25 23:46:50,959 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:50,959 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:50,960 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:50,960 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:57,031 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-25 23:46:57,087 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:46:57,098 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:01,626 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4824#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:01,626 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:01,626 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:47:01,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-25 23:47:01,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219107370] [2022-11-25 23:47:01,627 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:01,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 23:47:01,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:01,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 23:47:01,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1765, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 23:47:01,629 INFO L87 Difference]: Start difference. First operand 167 states and 229 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-25 23:47:19,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:19,216 INFO L93 Difference]: Finished difference Result 450 states and 637 transitions. [2022-11-25 23:47:19,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-25 23:47:19,216 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 59 [2022-11-25 23:47:19,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:19,219 INFO L225 Difference]: With dead ends: 450 [2022-11-25 23:47:19,220 INFO L226 Difference]: Without dead ends: 379 [2022-11-25 23:47:19,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 126 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2139 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=781, Invalid=5225, Unknown=0, NotChecked=0, Total=6006 [2022-11-25 23:47:19,222 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 268 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 1155 mSolverCounterSat, 336 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 1491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 1155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:19,223 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 376 Invalid, 1491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [336 Valid, 1155 Invalid, 0 Unknown, 0 Unchecked, 9.4s Time] [2022-11-25 23:47:19,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2022-11-25 23:47:19,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 248. [2022-11-25 23:47:19,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 156 states have (on average 1.2243589743589745) internal successors, (191), 157 states have internal predecessors, (191), 77 states have call successors, (77), 14 states have call predecessors, (77), 14 states have return successors, (76), 76 states have call predecessors, (76), 76 states have call successors, (76) [2022-11-25 23:47:19,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 344 transitions. [2022-11-25 23:47:19,399 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 344 transitions. Word has length 59 [2022-11-25 23:47:19,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:19,400 INFO L495 AbstractCegarLoop]: Abstraction has 248 states and 344 transitions. [2022-11-25 23:47:19,400 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-25 23:47:19,400 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 344 transitions. [2022-11-25 23:47:19,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-25 23:47:19,401 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:19,402 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:19,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:19,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-25 23:47:19,608 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:19,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:19,608 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 3 times [2022-11-25 23:47:19,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:19,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978823890] [2022-11-25 23:47:19,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:19,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:19,619 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:47:19,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [749312887] [2022-11-25 23:47:19,619 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:47:19,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:19,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:19,621 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:19,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 23:47:19,683 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:47:19,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:47:19,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 23:47:19,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:19,742 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:47:19,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:19,819 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:47:19,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:19,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978823890] [2022-11-25 23:47:19,820 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:47:19,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749312887] [2022-11-25 23:47:19,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [749312887] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:19,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [580199809] [2022-11-25 23:47:19,822 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-25 23:47:19,822 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:19,823 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:19,823 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:19,823 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:29,547 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-25 23:47:29,550 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:47:29,562 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:31,499 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6355#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:31,499 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:31,499 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:47:31,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-11-25 23:47:31,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204992923] [2022-11-25 23:47:31,499 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:31,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-25 23:47:31,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:31,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-25 23:47:31,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2022-11-25 23:47:31,501 INFO L87 Difference]: Start difference. First operand 248 states and 344 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-25 23:47:32,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:32,056 INFO L93 Difference]: Finished difference Result 357 states and 500 transitions. [2022-11-25 23:47:32,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-25 23:47:32,057 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2022-11-25 23:47:32,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:32,059 INFO L225 Difference]: With dead ends: 357 [2022-11-25 23:47:32,059 INFO L226 Difference]: Without dead ends: 259 [2022-11-25 23:47:32,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=244, Invalid=1562, Unknown=0, NotChecked=0, Total=1806 [2022-11-25 23:47:32,061 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 81 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:32,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 196 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:47:32,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-25 23:47:32,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 229. [2022-11-25 23:47:32,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 141 states have (on average 1.1914893617021276) internal successors, (168), 142 states have internal predecessors, (168), 73 states have call successors, (73), 14 states have call predecessors, (73), 14 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2022-11-25 23:47:32,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 313 transitions. [2022-11-25 23:47:32,214 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 313 transitions. Word has length 59 [2022-11-25 23:47:32,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:32,215 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 313 transitions. [2022-11-25 23:47:32,215 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-25 23:47:32,215 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 313 transitions. [2022-11-25 23:47:32,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-25 23:47:32,217 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:32,217 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:32,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:32,420 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:32,420 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:32,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:32,420 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2022-11-25 23:47:32,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:32,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638913422] [2022-11-25 23:47:32,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:32,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:32,428 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:47:32,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1853969008] [2022-11-25 23:47:32,428 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:47:32,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:32,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:32,432 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:32,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 23:47:32,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:32,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-25 23:47:32,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:32,625 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2022-11-25 23:47:32,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:32,722 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-25 23:47:32,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:32,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638913422] [2022-11-25 23:47:32,723 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:47:32,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853969008] [2022-11-25 23:47:32,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853969008] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-25 23:47:32,723 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:47:32,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2022-11-25 23:47:32,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875787833] [2022-11-25 23:47:32,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:47:32,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:47:32,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:32,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:47:32,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:47:32,725 INFO L87 Difference]: Start difference. First operand 229 states and 313 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-25 23:47:32,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:32,990 INFO L93 Difference]: Finished difference Result 261 states and 358 transitions. [2022-11-25 23:47:32,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:47:32,991 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 64 [2022-11-25 23:47:32,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:32,993 INFO L225 Difference]: With dead ends: 261 [2022-11-25 23:47:32,993 INFO L226 Difference]: Without dead ends: 259 [2022-11-25 23:47:32,994 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-25 23:47:32,994 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:32,995 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 105 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:47:32,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-25 23:47:33,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 255. [2022-11-25 23:47:33,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 153 states have (on average 1.196078431372549) internal successors, (183), 154 states have internal predecessors, (183), 85 states have call successors, (85), 16 states have call predecessors, (85), 16 states have return successors, (84), 84 states have call predecessors, (84), 84 states have call successors, (84) [2022-11-25 23:47:33,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 352 transitions. [2022-11-25 23:47:33,237 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 352 transitions. Word has length 64 [2022-11-25 23:47:33,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:33,237 INFO L495 AbstractCegarLoop]: Abstraction has 255 states and 352 transitions. [2022-11-25 23:47:33,238 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-25 23:47:33,238 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 352 transitions. [2022-11-25 23:47:33,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-25 23:47:33,239 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:33,239 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:33,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:33,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-25 23:47:33,445 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:33,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:33,446 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2022-11-25 23:47:33,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:33,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264039489] [2022-11-25 23:47:33,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:33,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:33,454 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:47:33,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1597565533] [2022-11-25 23:47:33,454 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:47:33,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:33,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:33,456 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:33,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 23:47:33,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:47:33,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:47:33,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-25 23:47:33,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:34,246 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 13 proven. 22 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-25 23:47:34,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:35,304 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-25 23:47:35,305 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:35,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264039489] [2022-11-25 23:47:35,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:47:35,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597565533] [2022-11-25 23:47:35,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597565533] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:35,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1254591560] [2022-11-25 23:47:35,308 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-25 23:47:35,308 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:35,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:35,309 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:35,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:41,801 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-25 23:47:41,850 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:47:41,863 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:49,277 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8914#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:49,277 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:49,278 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:47:49,278 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-25 23:47:49,278 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823298001] [2022-11-25 23:47:49,278 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:49,278 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 23:47:49,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:49,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 23:47:49,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1768, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 23:47:49,280 INFO L87 Difference]: Start difference. First operand 255 states and 352 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-25 23:48:14,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:48:14,636 INFO L93 Difference]: Finished difference Result 395 states and 560 transitions. [2022-11-25 23:48:14,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-25 23:48:14,637 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 64 [2022-11-25 23:48:14,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:48:14,639 INFO L225 Difference]: With dead ends: 395 [2022-11-25 23:48:14,639 INFO L226 Difference]: Without dead ends: 393 [2022-11-25 23:48:14,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 140 SyntacticMatches, 7 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1783 ImplicationChecksByTransitivity, 22.9s TimeCoverageRelationStatistics Valid=654, Invalid=4316, Unknown=0, NotChecked=0, Total=4970 [2022-11-25 23:48:14,641 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 280 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 1101 mSolverCounterSat, 378 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 1479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 378 IncrementalHoareTripleChecker+Valid, 1101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:48:14,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [280 Valid, 369 Invalid, 1479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [378 Valid, 1101 Invalid, 0 Unknown, 0 Unchecked, 10.4s Time] [2022-11-25 23:48:14,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2022-11-25 23:48:14,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 342. [2022-11-25 23:48:14,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 202 states have (on average 1.2128712871287128) internal successors, (245), 203 states have internal predecessors, (245), 121 states have call successors, (121), 18 states have call predecessors, (121), 18 states have return successors, (120), 120 states have call predecessors, (120), 120 states have call successors, (120) [2022-11-25 23:48:14,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 486 transitions. [2022-11-25 23:48:14,895 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 486 transitions. Word has length 64 [2022-11-25 23:48:14,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:48:14,895 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 486 transitions. [2022-11-25 23:48:14,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-25 23:48:14,895 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 486 transitions. [2022-11-25 23:48:14,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-25 23:48:14,897 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:48:14,897 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:48:14,903 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-25 23:48:15,097 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-25 23:48:15,098 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:48:15,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:48:15,098 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2022-11-25 23:48:15,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:48:15,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625917856] [2022-11-25 23:48:15,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:48:15,099 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:48:15,108 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:48:15,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1543050109] [2022-11-25 23:48:15,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:48:15,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:48:15,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:48:15,110 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:48:15,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 23:48:15,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:48:15,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-25 23:48:15,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:48:16,115 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-11-25 23:48:16,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:48:17,905 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 16 proven. 19 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-25 23:48:17,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:48:17,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625917856] [2022-11-25 23:48:17,905 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:48:17,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543050109] [2022-11-25 23:48:17,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543050109] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:48:17,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1146285549] [2022-11-25 23:48:17,908 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-25 23:48:17,908 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:48:17,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:48:17,909 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:48:17,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:48:23,980 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-25 23:48:24,026 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:48:24,039 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:48:31,821 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10640#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:48:31,821 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:48:31,821 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:48:31,821 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 29 [2022-11-25 23:48:31,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739636633] [2022-11-25 23:48:31,822 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:48:31,822 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-25 23:48:31,822 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:48:31,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-25 23:48:31,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1861, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 23:48:31,824 INFO L87 Difference]: Start difference. First operand 342 states and 486 transitions. Second operand has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) [2022-11-25 23:48:40,000 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:49:29,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:49:29,451 INFO L93 Difference]: Finished difference Result 489 states and 696 transitions. [2022-11-25 23:49:29,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-25 23:49:29,452 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) Word has length 78 [2022-11-25 23:49:29,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:49:29,455 INFO L225 Difference]: With dead ends: 489 [2022-11-25 23:49:29,455 INFO L226 Difference]: Without dead ends: 485 [2022-11-25 23:49:29,459 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 172 SyntacticMatches, 16 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4345 ImplicationChecksByTransitivity, 51.3s TimeCoverageRelationStatistics Valid=1513, Invalid=10259, Unknown=0, NotChecked=0, Total=11772 [2022-11-25 23:49:29,459 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 284 mSDsluCounter, 532 mSDsCounter, 0 mSdLazyCounter, 2187 mSolverCounterSat, 585 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 623 SdHoareTripleChecker+Invalid, 2772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 585 IncrementalHoareTripleChecker+Valid, 2187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.9s IncrementalHoareTripleChecker+Time [2022-11-25 23:49:29,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 623 Invalid, 2772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [585 Valid, 2187 Invalid, 0 Unknown, 0 Unchecked, 14.9s Time] [2022-11-25 23:49:29,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2022-11-25 23:49:30,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 441. [2022-11-25 23:49:30,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 253 states have (on average 1.225296442687747) internal successors, (310), 254 states have internal predecessors, (310), 165 states have call successors, (165), 22 states have call predecessors, (165), 22 states have return successors, (164), 164 states have call predecessors, (164), 164 states have call successors, (164) [2022-11-25 23:49:30,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 639 transitions. [2022-11-25 23:49:30,076 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 639 transitions. Word has length 78 [2022-11-25 23:49:30,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:49:30,076 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 639 transitions. [2022-11-25 23:49:30,077 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) [2022-11-25 23:49:30,077 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 639 transitions. [2022-11-25 23:49:30,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-25 23:49:30,078 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:49:30,078 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:49:30,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-25 23:49:30,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-25 23:49:30,278 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:49:30,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:49:30,279 INFO L85 PathProgramCache]: Analyzing trace with hash -1729932497, now seen corresponding path program 1 times [2022-11-25 23:49:30,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:49:30,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320508229] [2022-11-25 23:49:30,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:30,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:49:30,289 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:49:30,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1129672017] [2022-11-25 23:49:30,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:30,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:30,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:49:30,291 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:49:30,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 23:49:30,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:49:30,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-25 23:49:30,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:49:30,667 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-25 23:49:30,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:49:31,297 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2022-11-25 23:49:31,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:49:31,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320508229] [2022-11-25 23:49:31,298 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:49:31,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1129672017] [2022-11-25 23:49:31,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1129672017] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:49:31,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [681027254] [2022-11-25 23:49:31,300 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-25 23:49:31,300 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:49:31,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:49:31,301 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:49:31,301 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:49:33,704 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-11-25 23:49:33,742 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:49:33,754 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:49:36,772 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12760#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:49:36,772 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:49:36,772 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:49:36,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2022-11-25 23:49:36,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102842165] [2022-11-25 23:49:36,772 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:49:36,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-25 23:49:36,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:49:36,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-25 23:49:36,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1235, Unknown=0, NotChecked=0, Total=1406 [2022-11-25 23:49:36,774 INFO L87 Difference]: Start difference. First operand 441 states and 639 transitions. Second operand has 21 states, 20 states have (on average 1.9) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-25 23:49:43,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:49:43,093 INFO L93 Difference]: Finished difference Result 1040 states and 1644 transitions. [2022-11-25 23:49:43,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-25 23:49:43,094 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 81 [2022-11-25 23:49:43,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:49:43,100 INFO L225 Difference]: With dead ends: 1040 [2022-11-25 23:49:43,100 INFO L226 Difference]: Without dead ends: 1038 [2022-11-25 23:49:43,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 198 SyntacticMatches, 11 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1910 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=736, Invalid=4094, Unknown=0, NotChecked=0, Total=4830 [2022-11-25 23:49:43,103 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 174 mSDsluCounter, 449 mSDsCounter, 0 mSdLazyCounter, 843 mSolverCounterSat, 293 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 542 SdHoareTripleChecker+Invalid, 1136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 293 IncrementalHoareTripleChecker+Valid, 843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:49:43,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [178 Valid, 542 Invalid, 1136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [293 Valid, 843 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-25 23:49:43,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1038 states. [2022-11-25 23:49:44,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1038 to 852. [2022-11-25 23:49:44,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 852 states, 426 states have (on average 1.3051643192488263) internal successors, (556), 427 states have internal predecessors, (556), 401 states have call successors, (401), 24 states have call predecessors, (401), 24 states have return successors, (400), 400 states have call predecessors, (400), 400 states have call successors, (400) [2022-11-25 23:49:44,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 852 states to 852 states and 1357 transitions. [2022-11-25 23:49:44,345 INFO L78 Accepts]: Start accepts. Automaton has 852 states and 1357 transitions. Word has length 81 [2022-11-25 23:49:44,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:49:44,346 INFO L495 AbstractCegarLoop]: Abstraction has 852 states and 1357 transitions. [2022-11-25 23:49:44,346 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-25 23:49:44,347 INFO L276 IsEmpty]: Start isEmpty. Operand 852 states and 1357 transitions. [2022-11-25 23:49:44,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-25 23:49:44,348 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:49:44,348 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:49:44,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-25 23:49:44,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:44,554 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:49:44,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:49:44,555 INFO L85 PathProgramCache]: Analyzing trace with hash 144664241, now seen corresponding path program 1 times [2022-11-25 23:49:44,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:49:44,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325877338] [2022-11-25 23:49:44,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:44,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:49:44,565 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:49:44,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1810800145] [2022-11-25 23:49:44,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:44,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:44,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:49:44,567 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:49:44,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 23:49:44,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:49:44,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-25 23:49:44,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:49:45,459 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 20 proven. 21 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-25 23:49:45,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:49:46,577 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-11-25 23:49:46,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:49:46,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325877338] [2022-11-25 23:49:46,577 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:49:46,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810800145] [2022-11-25 23:49:46,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810800145] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:49:46,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [344836802] [2022-11-25 23:49:46,579 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-25 23:49:46,579 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:49:46,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:49:46,580 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:49:46,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:49:52,534 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-25 23:49:52,575 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:49:52,611 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:50:03,289 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16502#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-25 23:50:03,289 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:50:03,289 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:50:03,289 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 22 [2022-11-25 23:50:03,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382883164] [2022-11-25 23:50:03,289 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:50:03,290 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-25 23:50:03,290 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:50:03,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-25 23:50:03,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1250, Unknown=0, NotChecked=0, Total=1406 [2022-11-25 23:50:03,291 INFO L87 Difference]: Start difference. First operand 852 states and 1357 transitions. Second operand has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 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) [2022-11-25 23:50:20,617 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:50:46,485 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:50:57,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:50:57,625 INFO L93 Difference]: Finished difference Result 1152 states and 1820 transitions. [2022-11-25 23:50:57,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-25 23:50:57,626 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 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 81 [2022-11-25 23:50:57,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:50:57,632 INFO L225 Difference]: With dead ends: 1152 [2022-11-25 23:50:57,633 INFO L226 Difference]: Without dead ends: 1150 [2022-11-25 23:50:57,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 187 SyntacticMatches, 18 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2363 ImplicationChecksByTransitivity, 39.0s TimeCoverageRelationStatistics Valid=887, Invalid=5119, Unknown=0, NotChecked=0, Total=6006 [2022-11-25 23:50:57,635 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 179 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 1614 mSolverCounterSat, 346 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 1962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 346 IncrementalHoareTripleChecker+Valid, 1614 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:50:57,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [179 Valid, 498 Invalid, 1962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [346 Valid, 1614 Invalid, 2 Unknown, 0 Unchecked, 25.1s Time] [2022-11-25 23:50:57,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1150 states. [2022-11-25 23:50:59,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1150 to 1056. [2022-11-25 23:50:59,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1056 states, 533 states have (on average 1.3076923076923077) internal successors, (697), 534 states have internal predecessors, (697), 493 states have call successors, (493), 29 states have call predecessors, (493), 29 states have return successors, (492), 492 states have call predecessors, (492), 492 states have call successors, (492) [2022-11-25 23:50:59,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1056 states to 1056 states and 1682 transitions. [2022-11-25 23:50:59,275 INFO L78 Accepts]: Start accepts. Automaton has 1056 states and 1682 transitions. Word has length 81 [2022-11-25 23:50:59,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:50:59,275 INFO L495 AbstractCegarLoop]: Abstraction has 1056 states and 1682 transitions. [2022-11-25 23:50:59,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 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) [2022-11-25 23:50:59,276 INFO L276 IsEmpty]: Start isEmpty. Operand 1056 states and 1682 transitions. [2022-11-25 23:50:59,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-25 23:50:59,277 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:50:59,277 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:50:59,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-25 23:50:59,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-25 23:50:59,483 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:50:59,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:50:59,484 INFO L85 PathProgramCache]: Analyzing trace with hash 646028470, now seen corresponding path program 6 times [2022-11-25 23:50:59,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:50:59,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2127426837] [2022-11-25 23:50:59,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:50:59,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:50:59,493 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:50:59,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [409010089] [2022-11-25 23:50:59,493 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:50:59,493 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:50:59,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:50:59,498 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:50:59,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-25 23:50:59,562 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:50:59,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:50:59,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-25 23:50:59,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:51:01,643 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 34 proven. 44 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-25 23:51:01,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:51:02,827 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-25 23:51:02,827 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:51:02,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2127426837] [2022-11-25 23:51:02,827 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:51:02,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409010089] [2022-11-25 23:51:02,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409010089] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:51:02,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [783900870] [2022-11-25 23:51:02,829 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-25 23:51:02,830 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:51:02,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:51:02,830 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:51:02,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:51:08,806 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-25 23:51:08,854 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:51:08,867 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:51:12,451 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20807#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:51:12,452 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:51:12,452 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:51:12,452 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 8] total 24 [2022-11-25 23:51:12,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028849096] [2022-11-25 23:51:12,452 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:51:12,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-25 23:51:12,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:51:12,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-25 23:51:12,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1624, Unknown=0, NotChecked=0, Total=1806 [2022-11-25 23:51:12,454 INFO L87 Difference]: Start difference. First operand 1056 states and 1682 transitions. Second operand has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-25 23:51:36,830 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:51:39,383 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:51:54,215 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 [] [2022-11-25 23:51:56,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:51:56,211 INFO L93 Difference]: Finished difference Result 1259 states and 1986 transitions. [2022-11-25 23:51:56,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-25 23:51:56,212 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) Word has length 84 [2022-11-25 23:51:56,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:51:56,216 INFO L225 Difference]: With dead ends: 1259 [2022-11-25 23:51:56,216 INFO L226 Difference]: Without dead ends: 1257 [2022-11-25 23:51:56,217 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 206 SyntacticMatches, 11 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1598 ImplicationChecksByTransitivity, 27.2s TimeCoverageRelationStatistics Valid=396, Invalid=3385, Unknown=1, NotChecked=0, Total=3782 [2022-11-25 23:51:56,218 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 111 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 1081 mSolverCounterSat, 158 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 1241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 1081 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:51:56,218 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 293 Invalid, 1241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 1081 Invalid, 2 Unknown, 0 Unchecked, 19.8s Time] [2022-11-25 23:51:56,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1257 states. [2022-11-25 23:51:57,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1257 to 1107. [2022-11-25 23:51:57,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1107 states, 568 states have (on average 1.2940140845070423) internal successors, (735), 571 states have internal predecessors, (735), 503 states have call successors, (503), 35 states have call predecessors, (503), 35 states have return successors, (502), 500 states have call predecessors, (502), 502 states have call successors, (502) [2022-11-25 23:51:57,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1107 states to 1107 states and 1740 transitions. [2022-11-25 23:51:57,883 INFO L78 Accepts]: Start accepts. Automaton has 1107 states and 1740 transitions. Word has length 84 [2022-11-25 23:51:57,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:51:57,883 INFO L495 AbstractCegarLoop]: Abstraction has 1107 states and 1740 transitions. [2022-11-25 23:51:57,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-25 23:51:57,884 INFO L276 IsEmpty]: Start isEmpty. Operand 1107 states and 1740 transitions. [2022-11-25 23:51:57,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-25 23:51:57,886 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:51:57,886 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 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, 1, 1, 1, 1] [2022-11-25 23:51:57,895 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-25 23:51:58,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-25 23:51:58,092 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:51:58,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:51:58,093 INFO L85 PathProgramCache]: Analyzing trace with hash 355863159, now seen corresponding path program 2 times [2022-11-25 23:51:58,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:51:58,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441989713] [2022-11-25 23:51:58,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:51:58,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:51:58,102 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:51:58,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [709139290] [2022-11-25 23:51:58,102 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:51:58,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:51:58,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:51:58,104 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:51:58,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-25 23:51:58,195 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 23:51:58,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:51:58,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-25 23:51:58,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:51:59,334 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 27 proven. 27 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-25 23:51:59,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:52:01,759 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 24 proven. 27 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-11-25 23:52:01,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:52:01,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441989713] [2022-11-25 23:52:01,759 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:52:01,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709139290] [2022-11-25 23:52:01,759 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709139290] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:52:01,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2067927085] [2022-11-25 23:52:01,761 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-25 23:52:01,761 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:52:01,762 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:52:01,762 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:52:01,762 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:52:07,779 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-25 23:52:07,819 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:52:07,831 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:52:13,716 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25428#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:52:13,716 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:52:13,716 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:52:13,717 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 29 [2022-11-25 23:52:13,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593333647] [2022-11-25 23:52:13,717 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:52:13,717 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-25 23:52:13,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:52:13,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-25 23:52:13,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=1845, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 23:52:13,719 INFO L87 Difference]: Start difference. First operand 1107 states and 1740 transitions. Second operand has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2022-11-25 23:52:26,502 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:52:34,613 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:52:52,373 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.75s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:53:32,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:53:32,444 INFO L93 Difference]: Finished difference Result 1756 states and 2758 transitions. [2022-11-25 23:53:32,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-11-25 23:53:32,444 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) Word has length 98 [2022-11-25 23:53:32,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:53:32,451 INFO L225 Difference]: With dead ends: 1756 [2022-11-25 23:53:32,451 INFO L226 Difference]: Without dead ends: 1344 [2022-11-25 23:53:32,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 226 SyntacticMatches, 22 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6176 ImplicationChecksByTransitivity, 55.2s TimeCoverageRelationStatistics Valid=2347, Invalid=13153, Unknown=0, NotChecked=0, Total=15500 [2022-11-25 23:53:32,456 INFO L413 NwaCegarLoop]: 99 mSDtfsCounter, 317 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 2054 mSolverCounterSat, 577 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 690 SdHoareTripleChecker+Invalid, 2632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 577 IncrementalHoareTripleChecker+Valid, 2054 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 28.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:53:32,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [317 Valid, 690 Invalid, 2632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [577 Valid, 2054 Invalid, 1 Unknown, 0 Unchecked, 28.0s Time] [2022-11-25 23:53:32,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1344 states. [2022-11-25 23:53:34,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1344 to 1191. [2022-11-25 23:53:34,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1191 states, 608 states have (on average 1.2911184210526316) internal successors, (785), 611 states have internal predecessors, (785), 543 states have call successors, (543), 39 states have call predecessors, (543), 39 states have return successors, (542), 540 states have call predecessors, (542), 542 states have call successors, (542) [2022-11-25 23:53:34,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1191 states to 1191 states and 1870 transitions. [2022-11-25 23:53:34,491 INFO L78 Accepts]: Start accepts. Automaton has 1191 states and 1870 transitions. Word has length 98 [2022-11-25 23:53:34,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:53:34,491 INFO L495 AbstractCegarLoop]: Abstraction has 1191 states and 1870 transitions. [2022-11-25 23:53:34,492 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2022-11-25 23:53:34,492 INFO L276 IsEmpty]: Start isEmpty. Operand 1191 states and 1870 transitions. [2022-11-25 23:53:34,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-25 23:53:34,494 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:53:34,495 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:53:34,505 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-25 23:53:34,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-25 23:53:34,700 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:53:34,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:53:34,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1281823225, now seen corresponding path program 3 times [2022-11-25 23:53:34,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:53:34,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018957434] [2022-11-25 23:53:34,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:53:34,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:53:34,710 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:53:34,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [997670447] [2022-11-25 23:53:34,711 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:53:34,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:53:34,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:53:34,714 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:53:34,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-25 23:53:34,800 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:53:34,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:53:34,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-25 23:53:34,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:53:36,245 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 52 proven. 46 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2022-11-25 23:53:36,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:53:44,053 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 50 proven. 45 refuted. 0 times theorem prover too weak. 243 trivial. 0 not checked. [2022-11-25 23:53:44,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:53:44,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018957434] [2022-11-25 23:53:44,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:53:44,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997670447] [2022-11-25 23:53:44,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [997670447] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:53:44,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1692955869] [2022-11-25 23:53:44,055 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-25 23:53:44,055 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:53:44,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:53:44,056 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:53:44,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:53:49,975 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-25 23:53:49,979 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:53:49,992 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:54:07,135 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31157#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:54:07,136 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:54:07,136 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:54:07,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2022-11-25 23:54:07,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433100792] [2022-11-25 23:54:07,136 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:54:07,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-25 23:54:07,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:54:07,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-25 23:54:07,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=323, Invalid=2539, Unknown=0, NotChecked=0, Total=2862 [2022-11-25 23:54:07,139 INFO L87 Difference]: Start difference. First operand 1191 states and 1870 transitions. Second operand has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) [2022-11-25 23:54:17,762 WARN L233 SmtUtils]: Spent 6.06s on a formula simplification that was a NOOP. DAG size: 107 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:54:28,086 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:54:32,459 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:54:36,805 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:54:50,162 WARN L233 SmtUtils]: Spent 9.27s on a formula simplification that was a NOOP. DAG size: 114 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:54:54,084 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:55:00,943 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:55:03,744 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:55:06,404 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:55:08,218 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:55:10,223 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:55:12,226 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:55:22,596 WARN L233 SmtUtils]: Spent 5.93s on a formula simplification that was a NOOP. DAG size: 109 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:55:30,940 WARN L233 SmtUtils]: Spent 7.04s on a formula simplification that was a NOOP. DAG size: 113 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:55:40,742 WARN L233 SmtUtils]: Spent 8.44s on a formula simplification that was a NOOP. DAG size: 117 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:55:44,200 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:55:47,145 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:55:48,700 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:56:08,572 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:56:11,017 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.37s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:56:27,397 WARN L233 SmtUtils]: Spent 9.69s on a formula simplification that was a NOOP. DAG size: 121 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:56:34,057 WARN L233 SmtUtils]: Spent 5.23s on a formula simplification that was a NOOP. DAG size: 104 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:56:36,768 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:56:39,070 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:56:42,589 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:57:01,938 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:57:17,431 WARN L233 SmtUtils]: Spent 5.86s on a formula simplification that was a NOOP. DAG size: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:57:31,550 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:57:34,068 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:57:40,287 WARN L233 SmtUtils]: Spent 5.47s on a formula simplification. DAG size of input: 112 DAG size of output: 110 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:57:51,136 WARN L233 SmtUtils]: Spent 7.99s on a formula simplification. DAG size of input: 110 DAG size of output: 108 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:57:57,762 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.59s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:58:07,249 WARN L233 SmtUtils]: Spent 6.92s on a formula simplification that was a NOOP. DAG size: 119 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:58:11,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:11,700 INFO L93 Difference]: Finished difference Result 1696 states and 2652 transitions. [2022-11-25 23:58:11,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-11-25 23:58:11,701 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) Word has length 103 [2022-11-25 23:58:11,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:11,709 INFO L225 Difference]: With dead ends: 1696 [2022-11-25 23:58:11,710 INFO L226 Difference]: Without dead ends: 1687 [2022-11-25 23:58:11,713 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 243 SyntacticMatches, 12 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7302 ImplicationChecksByTransitivity, 185.2s TimeCoverageRelationStatistics Valid=3045, Invalid=16137, Unknown=0, NotChecked=0, Total=19182 [2022-11-25 23:58:11,714 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 360 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 3229 mSolverCounterSat, 704 mSolverCounterUnsat, 17 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 76.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 3950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 704 IncrementalHoareTripleChecker+Valid, 3229 IncrementalHoareTripleChecker+Invalid, 17 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 76.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:11,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [360 Valid, 484 Invalid, 3950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [704 Valid, 3229 Invalid, 17 Unknown, 0 Unchecked, 76.6s Time] [2022-11-25 23:58:11,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1687 states. [2022-11-25 23:58:14,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1687 to 1325. [2022-11-25 23:58:14,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1325 states, 680 states have (on average 1.2897058823529413) internal successors, (877), 683 states have internal predecessors, (877), 599 states have call successors, (599), 45 states have call predecessors, (599), 45 states have return successors, (598), 596 states have call predecessors, (598), 598 states have call successors, (598) [2022-11-25 23:58:14,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1325 states to 1325 states and 2074 transitions. [2022-11-25 23:58:14,568 INFO L78 Accepts]: Start accepts. Automaton has 1325 states and 2074 transitions. Word has length 103 [2022-11-25 23:58:14,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:14,569 INFO L495 AbstractCegarLoop]: Abstraction has 1325 states and 2074 transitions. [2022-11-25 23:58:14,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) [2022-11-25 23:58:14,570 INFO L276 IsEmpty]: Start isEmpty. Operand 1325 states and 2074 transitions. [2022-11-25 23:58:14,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-25 23:58:14,572 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:14,572 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 4, 4, 4, 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] [2022-11-25 23:58:14,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:14,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:14,778 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:14,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:14,778 INFO L85 PathProgramCache]: Analyzing trace with hash 1547138168, now seen corresponding path program 2 times [2022-11-25 23:58:14,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:14,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850185903] [2022-11-25 23:58:14,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:14,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:14,787 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:58:14,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [246915317] [2022-11-25 23:58:14,787 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:58:14,787 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:14,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:14,789 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:14,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-25 23:58:14,884 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-25 23:58:14,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:58:14,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 71 conjunts are in the unsatisfiable core [2022-11-25 23:58:14,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:16,701 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 70 proven. 35 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2022-11-25 23:58:16,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:18,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:18,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850185903] [2022-11-25 23:58:18,202 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:58:18,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246915317] [2022-11-25 23:58:18,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246915317] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:18,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1381849052] [2022-11-25 23:58:18,204 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-25 23:58:18,204 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:18,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:18,205 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:18,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:24,058 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-25 23:58:24,099 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:58:24,112 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:35,499 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36762#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:35,499 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:35,499 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:58:35,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-11-25 23:58:35,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758420987] [2022-11-25 23:58:35,500 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:35,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-25 23:58:35,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:35,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-25 23:58:35,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1609, Unknown=0, NotChecked=0, Total=1806 [2022-11-25 23:58:35,501 INFO L87 Difference]: Start difference. First operand 1325 states and 2074 transitions. Second operand has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-25 23:58:40,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:40,678 INFO L93 Difference]: Finished difference Result 1495 states and 2324 transitions. [2022-11-25 23:58:40,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:58:40,678 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 108 [2022-11-25 23:58:40,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:40,684 INFO L225 Difference]: With dead ends: 1495 [2022-11-25 23:58:40,684 INFO L226 Difference]: Without dead ends: 1493 [2022-11-25 23:58:40,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 169 SyntacticMatches, 25 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1768 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=290, Invalid=2362, Unknown=0, NotChecked=0, Total=2652 [2022-11-25 23:58:40,686 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 83 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 821 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 821 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:40,686 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 194 Invalid, 892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 821 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-25 23:58:40,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1493 states. [2022-11-25 23:58:43,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1493 to 1401. [2022-11-25 23:58:43,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1401 states, 723 states have (on average 1.2863070539419088) internal successors, (930), 726 states have internal predecessors, (930), 627 states have call successors, (627), 50 states have call predecessors, (627), 50 states have return successors, (626), 624 states have call predecessors, (626), 626 states have call successors, (626) [2022-11-25 23:58:43,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1401 states to 1401 states and 2183 transitions. [2022-11-25 23:58:43,698 INFO L78 Accepts]: Start accepts. Automaton has 1401 states and 2183 transitions. Word has length 108 [2022-11-25 23:58:43,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:43,700 INFO L495 AbstractCegarLoop]: Abstraction has 1401 states and 2183 transitions. [2022-11-25 23:58:43,700 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-25 23:58:43,700 INFO L276 IsEmpty]: Start isEmpty. Operand 1401 states and 2183 transitions. [2022-11-25 23:58:43,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-25 23:58:43,703 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:43,703 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 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] [2022-11-25 23:58:43,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:43,914 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:43,915 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:43,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:43,915 INFO L85 PathProgramCache]: Analyzing trace with hash -1168736987, now seen corresponding path program 3 times [2022-11-25 23:58:43,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:43,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458963161] [2022-11-25 23:58:43,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:43,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:43,926 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:58:43,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1123669477] [2022-11-25 23:58:43,926 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:58:43,926 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:43,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:43,929 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:43,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ab42a4-e4cb-488d-94d9-2206fe79f933/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-25 23:58:44,071 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:58:44,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:58:44,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 78 conjunts are in the unsatisfiable core [2022-11-25 23:58:44,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:45,308 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 28 proven. 56 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2022-11-25 23:58:45,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:47,931 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 26 proven. 55 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2022-11-25 23:58:47,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:47,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458963161] [2022-11-25 23:58:47,931 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:58:47,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123669477] [2022-11-25 23:58:47,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1123669477] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:47,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [495538209] [2022-11-25 23:58:47,936 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-25 23:58:47,936 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:47,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:47,936 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:47,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:53,663 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-25 23:58:53,707 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:58:53,720 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:59:19,290 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42291#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:59:19,290 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:59:19,290 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:59:19,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16] total 32 [2022-11-25 23:59:19,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197215830] [2022-11-25 23:59:19,291 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:59:19,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-25 23:59:19,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:59:19,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-25 23:59:19,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=2029, Unknown=0, NotChecked=0, Total=2256 [2022-11-25 23:59:19,293 INFO L87 Difference]: Start difference. First operand 1401 states and 2183 transitions. Second operand has 32 states, 31 states have (on average 2.193548387096774) internal successors, (68), 29 states have internal predecessors, (68), 10 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 10 states have call successors, (32) [2022-11-25 23:59:40,780 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:59:42,815 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:59:44,817 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 [] [2022-11-26 00:00:15,446 WARN L233 SmtUtils]: Spent 15.46s on a formula simplification. DAG size of input: 107 DAG size of output: 100 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)