./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/pthread-divine/ring_2w1r-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/pthread-divine/ring_2w1r-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 509c3c8c1895397e4c0d03f6462ad0ca0ed3ce99b40d08b775ab8473dba5ee1f --- 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-2329fc7 [2022-12-14 14:49:05,609 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 14:49:05,611 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 14:49:05,628 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 14:49:05,628 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 14:49:05,629 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 14:49:05,630 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 14:49:05,632 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 14:49:05,633 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 14:49:05,634 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 14:49:05,635 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 14:49:05,636 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 14:49:05,636 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 14:49:05,637 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 14:49:05,638 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 14:49:05,639 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 14:49:05,640 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 14:49:05,641 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 14:49:05,642 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 14:49:05,644 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 14:49:05,645 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 14:49:05,646 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 14:49:05,647 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 14:49:05,648 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 14:49:05,651 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 14:49:05,652 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 14:49:05,652 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 14:49:05,653 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 14:49:05,653 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 14:49:05,654 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 14:49:05,654 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 14:49:05,655 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 14:49:05,656 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 14:49:05,656 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 14:49:05,657 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 14:49:05,657 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 14:49:05,658 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 14:49:05,658 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 14:49:05,659 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 14:49:05,659 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 14:49:05,660 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 14:49:05,661 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-12-14 14:49:05,680 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 14:49:05,680 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 14:49:05,680 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 14:49:05,681 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 14:49:05,681 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 14:49:05,681 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 14:49:05,682 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 14:49:05,682 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 14:49:05,682 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 14:49:05,682 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 14:49:05,682 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 14:49:05,682 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 14:49:05,683 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 14:49:05,683 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 14:49:05,683 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 14:49:05,683 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 14:49:05,683 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 14:49:05,683 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 14:49:05,684 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-12-14 14:49:05,684 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-12-14 14:49:05,685 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 14:49:05,685 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 14:49:05,685 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 14:49:05,685 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 14:49:05,685 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 14:49:05,685 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 14:49:05,685 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-12-14 14:49:05,686 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-12-14 14:49:05,686 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-12-14 14:49:05,686 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 14:49:05,686 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-12-14 14:49:05,686 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 14:49:05,686 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 14:49:05,687 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 14:49:05,687 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 14:49:05,687 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 14:49:05,687 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 14:49:05,687 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 14:49:05,687 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 14:49:05,688 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 14:49:05,688 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 14:49:05,688 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 14:49:05,688 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 509c3c8c1895397e4c0d03f6462ad0ca0ed3ce99b40d08b775ab8473dba5ee1f [2022-12-14 14:49:05,882 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 14:49:05,900 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 14:49:05,902 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 14:49:05,903 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 14:49:05,904 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 14:49:05,905 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/pthread-divine/ring_2w1r-1.i [2022-12-14 14:49:08,434 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 14:49:08,690 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 14:49:08,690 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i [2022-12-14 14:49:08,702 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/data/94b2a8a0d/c419d920250f4afd9bda1c68b3891ee6/FLAG59dfa3cd2 [2022-12-14 14:49:09,013 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/data/94b2a8a0d/c419d920250f4afd9bda1c68b3891ee6 [2022-12-14 14:49:09,015 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 14:49:09,017 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 14:49:09,018 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 14:49:09,018 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 14:49:09,022 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 14:49:09,022 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,024 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20ec99dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09, skipping insertion in model container [2022-12-14 14:49:09,024 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,032 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 14:49:09,070 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 14:49:09,171 WARN L611 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2022-12-14 14:49:09,339 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[39095,39108] [2022-12-14 14:49:09,343 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[39180,39193] [2022-12-14 14:49:09,344 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[39232,39245] [2022-12-14 14:49:09,397 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[49388,49401] [2022-12-14 14:49:09,398 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[49437,49450] [2022-12-14 14:49:09,400 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[49565,49578] [2022-12-14 14:49:09,401 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[49623,49636] [2022-12-14 14:49:09,405 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 14:49:09,413 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 14:49:09,422 WARN L611 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2022-12-14 14:49:09,443 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[39095,39108] [2022-12-14 14:49:09,443 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[39180,39193] [2022-12-14 14:49:09,444 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[39232,39245] [2022-12-14 14:49:09,455 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[49388,49401] [2022-12-14 14:49:09,456 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[49437,49450] [2022-12-14 14:49:09,457 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[49565,49578] [2022-12-14 14:49:09,457 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_c3d813b7-c906-41a2-bc7d-499353ac21ef/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i[49623,49636] [2022-12-14 14:49:09,460 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 14:49:09,507 INFO L208 MainTranslator]: Completed translation [2022-12-14 14:49:09,507 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09 WrapperNode [2022-12-14 14:49:09,507 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 14:49:09,508 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 14:49:09,508 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 14:49:09,508 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 14:49:09,513 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,529 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,557 INFO L138 Inliner]: procedures = 310, calls = 70, calls flagged for inlining = 10, calls inlined = 8, statements flattened = 203 [2022-12-14 14:49:09,557 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 14:49:09,558 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 14:49:09,558 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 14:49:09,558 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 14:49:09,565 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,565 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,568 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,568 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,575 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,579 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,581 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,583 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,585 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 14:49:09,586 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 14:49:09,586 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 14:49:09,586 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 14:49:09,586 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (1/1) ... [2022-12-14 14:49:09,591 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 14:49:09,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:49:09,611 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 14:49:09,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 14:49:09,637 INFO L130 BoogieDeclarations]: Found specification of procedure reader_two [2022-12-14 14:49:09,637 INFO L138 BoogieDeclarations]: Found implementation of procedure reader_two [2022-12-14 14:49:09,638 INFO L130 BoogieDeclarations]: Found specification of procedure writer_fn [2022-12-14 14:49:09,638 INFO L138 BoogieDeclarations]: Found implementation of procedure writer_fn [2022-12-14 14:49:09,638 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 14:49:09,638 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 14:49:09,638 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 14:49:09,638 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 14:49:09,638 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2022-12-14 14:49:09,638 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 14:49:09,638 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 14:49:09,639 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 14:49:09,639 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 14:49:09,640 WARN L209 CfgBuilder]: User set CodeBlockSize to LoopFreeBlock but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2022-12-14 14:49:09,744 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 14:49:09,746 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 14:49:10,103 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 14:49:10,109 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 14:49:10,109 INFO L300 CfgBuilder]: Removed 6 assume(true) statements. [2022-12-14 14:49:10,111 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:49:10 BoogieIcfgContainer [2022-12-14 14:49:10,111 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 14:49:10,112 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 14:49:10,112 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 14:49:10,114 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 14:49:10,115 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 02:49:09" (1/3) ... [2022-12-14 14:49:10,115 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39625806 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:49:10, skipping insertion in model container [2022-12-14 14:49:10,115 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:09" (2/3) ... [2022-12-14 14:49:10,115 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39625806 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:49:10, skipping insertion in model container [2022-12-14 14:49:10,115 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:49:10" (3/3) ... [2022-12-14 14:49:10,116 INFO L112 eAbstractionObserver]: Analyzing ICFG ring_2w1r-1.i [2022-12-14 14:49:10,130 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 14:49:10,130 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 61 error locations. [2022-12-14 14:49:10,130 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-12-14 14:49:10,200 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2022-12-14 14:49:10,224 INFO L115 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2022-12-14 14:49:10,235 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 283 places, 293 transitions, 602 flow [2022-12-14 14:49:10,237 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 283 places, 293 transitions, 602 flow [2022-12-14 14:49:10,238 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 283 places, 293 transitions, 602 flow [2022-12-14 14:49:10,308 INFO L130 PetriNetUnfolder]: 17/291 cut-off events. [2022-12-14 14:49:10,309 INFO L131 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2022-12-14 14:49:10,316 INFO L83 FinitePrefix]: Finished finitePrefix Result has 300 conditions, 291 events. 17/291 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 820 event pairs, 0 based on Foata normal form. 0/213 useless extension candidates. Maximal degree in co-relation 227. Up to 2 conditions per place. [2022-12-14 14:49:10,324 INFO L119 LiptonReduction]: Number of co-enabled transitions 31324 [2022-12-14 14:49:19,203 INFO L134 LiptonReduction]: Checked pairs total: 107824 [2022-12-14 14:49:19,203 INFO L136 LiptonReduction]: Total number of compositions: 307 [2022-12-14 14:49:19,209 INFO L113 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 116 places, 119 transitions, 254 flow [2022-12-14 14:49:19,639 INFO L135 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 24038 states, 19081 states have (on average 4.065300560767255) internal successors, (77570), 24037 states have internal predecessors, (77570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:19,656 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 14:49:19,662 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@7de1f38e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 14:49:19,663 INFO L358 AbstractCegarLoop]: Starting to check reachability of 99 error locations. [2022-12-14 14:49:19,688 INFO L276 IsEmpty]: Start isEmpty. Operand has 24038 states, 19081 states have (on average 4.065300560767255) internal successors, (77570), 24037 states have internal predecessors, (77570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:19,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2 [2022-12-14 14:49:19,692 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:19,692 INFO L195 NwaCegarLoop]: trace histogram [1] [2022-12-14 14:49:19,693 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:19,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:19,696 INFO L85 PathProgramCache]: Analyzing trace with hash 1158, now seen corresponding path program 1 times [2022-12-14 14:49:19,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:19,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986232101] [2022-12-14 14:49:19,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:19,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:19,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:19,800 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:19,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:19,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986232101] [2022-12-14 14:49:19,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986232101] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:19,801 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:19,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [0] imperfect sequences [] total 0 [2022-12-14 14:49:19,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829787828] [2022-12-14 14:49:19,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:19,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-12-14 14:49:19,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:19,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-12-14 14:49:19,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 14:49:19,862 INFO L87 Difference]: Start difference. First operand has 24038 states, 19081 states have (on average 4.065300560767255) internal successors, (77570), 24037 states have internal predecessors, (77570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 1 states have (on average 1.0) internal successors, (1), 1 states have internal predecessors, (1), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:20,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:20,223 INFO L93 Difference]: Finished difference Result 19244 states and 60216 transitions. [2022-12-14 14:49:20,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-12-14 14:49:20,226 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 1 states have (on average 1.0) internal successors, (1), 1 states have internal predecessors, (1), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 1 [2022-12-14 14:49:20,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:20,373 INFO L225 Difference]: With dead ends: 19244 [2022-12-14 14:49:20,374 INFO L226 Difference]: Without dead ends: 19244 [2022-12-14 14:49:20,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 0 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 14:49:20,377 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:20,378 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 39 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:49:20,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19244 states. [2022-12-14 14:49:20,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19244 to 19244. [2022-12-14 14:49:21,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19244 states, 16066 states have (on average 3.748039337731856) internal successors, (60216), 19243 states have internal predecessors, (60216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:21,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19244 states to 19244 states and 60216 transitions. [2022-12-14 14:49:21,142 INFO L78 Accepts]: Start accepts. Automaton has 19244 states and 60216 transitions. Word has length 1 [2022-12-14 14:49:21,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:21,142 INFO L495 AbstractCegarLoop]: Abstraction has 19244 states and 60216 transitions. [2022-12-14 14:49:21,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 1 states have (on average 1.0) internal successors, (1), 1 states have internal predecessors, (1), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:21,142 INFO L276 IsEmpty]: Start isEmpty. Operand 19244 states and 60216 transitions. [2022-12-14 14:49:21,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-12-14 14:49:21,143 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:21,143 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-12-14 14:49:21,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 14:49:21,144 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:21,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:21,144 INFO L85 PathProgramCache]: Analyzing trace with hash 1138377, now seen corresponding path program 1 times [2022-12-14 14:49:21,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:21,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900034639] [2022-12-14 14:49:21,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:21,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:21,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:21,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:21,352 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:21,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900034639] [2022-12-14 14:49:21,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1900034639] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:21,353 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:21,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 14:49:21,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321466292] [2022-12-14 14:49:21,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:21,354 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:49:21,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:21,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:49:21,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:49:21,355 INFO L87 Difference]: Start difference. First operand 19244 states and 60216 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:21,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:21,688 INFO L93 Difference]: Finished difference Result 19782 states and 61358 transitions. [2022-12-14 14:49:21,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:49:21,689 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-12-14 14:49:21,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:21,759 INFO L225 Difference]: With dead ends: 19782 [2022-12-14 14:49:21,759 INFO L226 Difference]: Without dead ends: 19782 [2022-12-14 14:49:21,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:49:21,761 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 90 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:21,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 33 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:49:21,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19782 states. [2022-12-14 14:49:22,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19782 to 19452. [2022-12-14 14:49:22,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19452 states, 16289 states have (on average 3.7456565780588127) internal successors, (61013), 19451 states have internal predecessors, (61013), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:22,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19452 states to 19452 states and 61013 transitions. [2022-12-14 14:49:22,272 INFO L78 Accepts]: Start accepts. Automaton has 19452 states and 61013 transitions. Word has length 3 [2022-12-14 14:49:22,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:22,273 INFO L495 AbstractCegarLoop]: Abstraction has 19452 states and 61013 transitions. [2022-12-14 14:49:22,273 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:22,273 INFO L276 IsEmpty]: Start isEmpty. Operand 19452 states and 61013 transitions. [2022-12-14 14:49:22,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-12-14 14:49:22,273 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:22,273 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-12-14 14:49:22,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 14:49:22,274 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:22,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:22,274 INFO L85 PathProgramCache]: Analyzing trace with hash 1138378, now seen corresponding path program 1 times [2022-12-14 14:49:22,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:22,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141430130] [2022-12-14 14:49:22,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:22,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:22,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:22,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:22,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:22,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141430130] [2022-12-14 14:49:22,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1141430130] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:22,404 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:22,404 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 14:49:22,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216938205] [2022-12-14 14:49:22,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:22,404 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 14:49:22,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:22,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 14:49:22,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 14:49:22,405 INFO L87 Difference]: Start difference. First operand 19452 states and 61013 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:22,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:22,587 INFO L93 Difference]: Finished difference Result 19394 states and 60872 transitions. [2022-12-14 14:49:22,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:49:22,587 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-12-14 14:49:22,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:22,652 INFO L225 Difference]: With dead ends: 19394 [2022-12-14 14:49:22,652 INFO L226 Difference]: Without dead ends: 19394 [2022-12-14 14:49:22,653 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 14:49:22,654 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 93 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:22,654 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 21 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:49:22,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19394 states. [2022-12-14 14:49:23,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19394 to 19394. [2022-12-14 14:49:23,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19394 states, 16260 states have (on average 3.7436654366543665) internal successors, (60872), 19393 states have internal predecessors, (60872), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:23,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19394 states to 19394 states and 60872 transitions. [2022-12-14 14:49:23,072 INFO L78 Accepts]: Start accepts. Automaton has 19394 states and 60872 transitions. Word has length 3 [2022-12-14 14:49:23,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:23,072 INFO L495 AbstractCegarLoop]: Abstraction has 19394 states and 60872 transitions. [2022-12-14 14:49:23,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:23,073 INFO L276 IsEmpty]: Start isEmpty. Operand 19394 states and 60872 transitions. [2022-12-14 14:49:23,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 14:49:23,073 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:23,073 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 14:49:23,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 14:49:23,074 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:23,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:23,074 INFO L85 PathProgramCache]: Analyzing trace with hash -445553292, now seen corresponding path program 1 times [2022-12-14 14:49:23,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:23,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198553228] [2022-12-14 14:49:23,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:23,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:23,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:23,115 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:23,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:23,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198553228] [2022-12-14 14:49:23,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198553228] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:23,116 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:23,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 14:49:23,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759093074] [2022-12-14 14:49:23,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:23,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:49:23,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:23,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:49:23,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:49:23,117 INFO L87 Difference]: Start difference. First operand 19394 states and 60872 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:23,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:23,502 INFO L93 Difference]: Finished difference Result 35410 states and 111430 transitions. [2022-12-14 14:49:23,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:49:23,503 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 14:49:23,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:23,646 INFO L225 Difference]: With dead ends: 35410 [2022-12-14 14:49:23,646 INFO L226 Difference]: Without dead ends: 35410 [2022-12-14 14:49:23,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:49:23,647 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 81 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:23,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 102 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:49:23,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35410 states. [2022-12-14 14:49:24,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35410 to 20208. [2022-12-14 14:49:24,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20208 states, 17074 states have (on average 3.7116668618952793) internal successors, (63373), 20207 states have internal predecessors, (63373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:24,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20208 states to 20208 states and 63373 transitions. [2022-12-14 14:49:24,443 INFO L78 Accepts]: Start accepts. Automaton has 20208 states and 63373 transitions. Word has length 6 [2022-12-14 14:49:24,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:24,444 INFO L495 AbstractCegarLoop]: Abstraction has 20208 states and 63373 transitions. [2022-12-14 14:49:24,444 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:24,444 INFO L276 IsEmpty]: Start isEmpty. Operand 20208 states and 63373 transitions. [2022-12-14 14:49:24,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 14:49:24,445 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:24,445 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:24,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 14:49:24,445 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting writer_fnErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:24,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:24,446 INFO L85 PathProgramCache]: Analyzing trace with hash -927358836, now seen corresponding path program 1 times [2022-12-14 14:49:24,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:24,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407554445] [2022-12-14 14:49:24,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:24,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:24,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:24,545 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:24,545 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:24,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407554445] [2022-12-14 14:49:24,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407554445] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:24,545 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:24,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 14:49:24,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660979232] [2022-12-14 14:49:24,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:24,546 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 14:49:24,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:24,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 14:49:24,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 14:49:24,547 INFO L87 Difference]: Start difference. First operand 20208 states and 63373 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:25,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:25,036 INFO L93 Difference]: Finished difference Result 17117 states and 53278 transitions. [2022-12-14 14:49:25,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 14:49:25,037 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 14:49:25,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:25,081 INFO L225 Difference]: With dead ends: 17117 [2022-12-14 14:49:25,081 INFO L226 Difference]: Without dead ends: 17117 [2022-12-14 14:49:25,081 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-12-14 14:49:25,082 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 347 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 713 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 347 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:25,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [347 Valid, 180 Invalid, 734 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 713 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 14:49:25,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17117 states. [2022-12-14 14:49:25,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17117 to 15078. [2022-12-14 14:49:25,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15078 states, 13294 states have (on average 3.561982849405747) internal successors, (47353), 15077 states have internal predecessors, (47353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:25,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15078 states to 15078 states and 47353 transitions. [2022-12-14 14:49:25,364 INFO L78 Accepts]: Start accepts. Automaton has 15078 states and 47353 transitions. Word has length 7 [2022-12-14 14:49:25,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:25,365 INFO L495 AbstractCegarLoop]: Abstraction has 15078 states and 47353 transitions. [2022-12-14 14:49:25,365 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:25,365 INFO L276 IsEmpty]: Start isEmpty. Operand 15078 states and 47353 transitions. [2022-12-14 14:49:25,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 14:49:25,366 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:25,366 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:25,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-12-14 14:49:25,366 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting writer_fnErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:25,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:25,366 INFO L85 PathProgramCache]: Analyzing trace with hash -927358835, now seen corresponding path program 1 times [2022-12-14 14:49:25,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:25,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116797585] [2022-12-14 14:49:25,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:25,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:25,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:25,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:25,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:25,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116797585] [2022-12-14 14:49:25,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116797585] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:25,510 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:25,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 14:49:25,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731878317] [2022-12-14 14:49:25,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:25,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 14:49:25,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:25,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 14:49:25,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 14:49:25,511 INFO L87 Difference]: Start difference. First operand 15078 states and 47353 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:26,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:26,011 INFO L93 Difference]: Finished difference Result 12335 states and 38707 transitions. [2022-12-14 14:49:26,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 14:49:26,011 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 14:49:26,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:26,037 INFO L225 Difference]: With dead ends: 12335 [2022-12-14 14:49:26,038 INFO L226 Difference]: Without dead ends: 12335 [2022-12-14 14:49:26,038 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-12-14 14:49:26,039 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 338 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:26,039 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [338 Valid, 126 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 14:49:26,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12335 states. [2022-12-14 14:49:26,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12335 to 10503. [2022-12-14 14:49:26,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10503 states, 9924 states have (on average 3.3294034663442162) internal successors, (33041), 10502 states have internal predecessors, (33041), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:26,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10503 states to 10503 states and 33041 transitions. [2022-12-14 14:49:26,233 INFO L78 Accepts]: Start accepts. Automaton has 10503 states and 33041 transitions. Word has length 7 [2022-12-14 14:49:26,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:26,233 INFO L495 AbstractCegarLoop]: Abstraction has 10503 states and 33041 transitions. [2022-12-14 14:49:26,233 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:26,233 INFO L276 IsEmpty]: Start isEmpty. Operand 10503 states and 33041 transitions. [2022-12-14 14:49:26,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 14:49:26,234 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:26,234 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:26,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-12-14 14:49:26,234 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:26,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:26,235 INFO L85 PathProgramCache]: Analyzing trace with hash -927250098, now seen corresponding path program 1 times [2022-12-14 14:49:26,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:26,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750732495] [2022-12-14 14:49:26,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:26,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:26,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:26,292 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:26,292 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:26,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750732495] [2022-12-14 14:49:26,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750732495] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:26,293 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:26,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:49:26,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399124423] [2022-12-14 14:49:26,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:26,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 14:49:26,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:26,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 14:49:26,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 14:49:26,294 INFO L87 Difference]: Start difference. First operand 10503 states and 33041 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:26,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:26,627 INFO L93 Difference]: Finished difference Result 8667 states and 26683 transitions. [2022-12-14 14:49:26,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 14:49:26,627 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 14:49:26,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:26,645 INFO L225 Difference]: With dead ends: 8667 [2022-12-14 14:49:26,645 INFO L226 Difference]: Without dead ends: 8667 [2022-12-14 14:49:26,645 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-12-14 14:49:26,646 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 230 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:26,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [230 Valid, 87 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 14:49:26,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8667 states. [2022-12-14 14:49:26,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8667 to 8344. [2022-12-14 14:49:26,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8344 states, 7945 states have (on average 3.2892385147891754) internal successors, (26133), 8343 states have internal predecessors, (26133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:26,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8344 states to 8344 states and 26133 transitions. [2022-12-14 14:49:26,774 INFO L78 Accepts]: Start accepts. Automaton has 8344 states and 26133 transitions. Word has length 7 [2022-12-14 14:49:26,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:26,774 INFO L495 AbstractCegarLoop]: Abstraction has 8344 states and 26133 transitions. [2022-12-14 14:49:26,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:26,774 INFO L276 IsEmpty]: Start isEmpty. Operand 8344 states and 26133 transitions. [2022-12-14 14:49:26,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 14:49:26,775 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:26,775 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:26,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-12-14 14:49:26,775 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:26,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:26,775 INFO L85 PathProgramCache]: Analyzing trace with hash -927250097, now seen corresponding path program 1 times [2022-12-14 14:49:26,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:26,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949464984] [2022-12-14 14:49:26,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:26,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:26,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:26,867 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:26,868 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:26,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949464984] [2022-12-14 14:49:26,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949464984] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:26,868 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:26,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:49:26,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191857431] [2022-12-14 14:49:26,868 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:26,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 14:49:26,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:26,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 14:49:26,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 14:49:26,869 INFO L87 Difference]: Start difference. First operand 8344 states and 26133 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:27,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:27,170 INFO L93 Difference]: Finished difference Result 6304 states and 19580 transitions. [2022-12-14 14:49:27,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 14:49:27,170 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 14:49:27,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:27,190 INFO L225 Difference]: With dead ends: 6304 [2022-12-14 14:49:27,191 INFO L226 Difference]: Without dead ends: 6304 [2022-12-14 14:49:27,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-12-14 14:49:27,191 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 237 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:27,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [237 Valid, 90 Invalid, 296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 14:49:27,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6304 states. [2022-12-14 14:49:27,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6304 to 6304. [2022-12-14 14:49:27,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6304 states, 6095 states have (on average 3.2124692370795733) internal successors, (19580), 6303 states have internal predecessors, (19580), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:27,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6304 states to 6304 states and 19580 transitions. [2022-12-14 14:49:27,319 INFO L78 Accepts]: Start accepts. Automaton has 6304 states and 19580 transitions. Word has length 7 [2022-12-14 14:49:27,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:27,320 INFO L495 AbstractCegarLoop]: Abstraction has 6304 states and 19580 transitions. [2022-12-14 14:49:27,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:27,320 INFO L276 IsEmpty]: Start isEmpty. Operand 6304 states and 19580 transitions. [2022-12-14 14:49:27,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 14:49:27,320 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:27,321 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:27,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-12-14 14:49:27,321 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting writer_fnErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:27,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:27,321 INFO L85 PathProgramCache]: Analyzing trace with hash -1716491241, now seen corresponding path program 1 times [2022-12-14 14:49:27,321 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:27,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352244298] [2022-12-14 14:49:27,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:27,322 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:27,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:27,793 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:27,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:27,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352244298] [2022-12-14 14:49:27,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [352244298] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:27,794 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:27,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-12-14 14:49:27,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561760981] [2022-12-14 14:49:27,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:27,794 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 14:49:27,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:27,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 14:49:27,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2022-12-14 14:49:27,795 INFO L87 Difference]: Start difference. First operand 6304 states and 19580 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:28,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:28,924 INFO L93 Difference]: Finished difference Result 8835 states and 27723 transitions. [2022-12-14 14:49:28,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 14:49:28,925 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 14:49:28,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:28,943 INFO L225 Difference]: With dead ends: 8835 [2022-12-14 14:49:28,943 INFO L226 Difference]: Without dead ends: 8835 [2022-12-14 14:49:28,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2022-12-14 14:49:28,943 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 401 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 1610 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 401 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 1614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:28,944 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [401 Valid, 202 Invalid, 1614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1610 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 14:49:28,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8835 states. [2022-12-14 14:49:29,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8835 to 7841. [2022-12-14 14:49:29,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7841 states, 7632 states have (on average 3.257206498951782) internal successors, (24859), 7840 states have internal predecessors, (24859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:29,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7841 states to 7841 states and 24859 transitions. [2022-12-14 14:49:29,070 INFO L78 Accepts]: Start accepts. Automaton has 7841 states and 24859 transitions. Word has length 10 [2022-12-14 14:49:29,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:29,071 INFO L495 AbstractCegarLoop]: Abstraction has 7841 states and 24859 transitions. [2022-12-14 14:49:29,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:29,071 INFO L276 IsEmpty]: Start isEmpty. Operand 7841 states and 24859 transitions. [2022-12-14 14:49:29,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 14:49:29,071 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:29,071 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:29,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-12-14 14:49:29,072 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:29,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:29,072 INFO L85 PathProgramCache]: Analyzing trace with hash 1522964039, now seen corresponding path program 1 times [2022-12-14 14:49:29,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:29,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922602219] [2022-12-14 14:49:29,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:29,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:29,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:29,343 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:29,343 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:29,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922602219] [2022-12-14 14:49:29,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922602219] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:29,343 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:29,343 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-12-14 14:49:29,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144899130] [2022-12-14 14:49:29,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:29,344 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-12-14 14:49:29,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:29,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-12-14 14:49:29,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-12-14 14:49:29,345 INFO L87 Difference]: Start difference. First operand 7841 states and 24859 transitions. Second operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:30,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:30,265 INFO L93 Difference]: Finished difference Result 9538 states and 29952 transitions. [2022-12-14 14:49:30,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 14:49:30,266 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 14:49:30,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:30,290 INFO L225 Difference]: With dead ends: 9538 [2022-12-14 14:49:30,290 INFO L226 Difference]: Without dead ends: 9538 [2022-12-14 14:49:30,290 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2022-12-14 14:49:30,290 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 403 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 1157 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 403 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 1161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:30,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [403 Valid, 157 Invalid, 1161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1157 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 14:49:30,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9538 states. [2022-12-14 14:49:30,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9538 to 8937. [2022-12-14 14:49:30,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8937 states, 8728 states have (on average 3.240146654445463) internal successors, (28280), 8936 states have internal predecessors, (28280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:30,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8937 states to 8937 states and 28280 transitions. [2022-12-14 14:49:30,514 INFO L78 Accepts]: Start accepts. Automaton has 8937 states and 28280 transitions. Word has length 10 [2022-12-14 14:49:30,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:30,514 INFO L495 AbstractCegarLoop]: Abstraction has 8937 states and 28280 transitions. [2022-12-14 14:49:30,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:30,514 INFO L276 IsEmpty]: Start isEmpty. Operand 8937 states and 28280 transitions. [2022-12-14 14:49:30,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 14:49:30,515 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:30,515 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:30,515 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-12-14 14:49:30,515 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting writer_fnErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:30,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:30,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1671613607, now seen corresponding path program 1 times [2022-12-14 14:49:30,516 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:30,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996702043] [2022-12-14 14:49:30,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:30,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:30,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:30,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:30,990 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:30,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996702043] [2022-12-14 14:49:30,991 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996702043] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:30,991 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:30,991 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-12-14 14:49:30,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841781234] [2022-12-14 14:49:30,991 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:30,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-12-14 14:49:30,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:30,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-12-14 14:49:30,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-12-14 14:49:30,992 INFO L87 Difference]: Start difference. First operand 8937 states and 28280 transitions. Second operand has 11 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:32,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:32,390 INFO L93 Difference]: Finished difference Result 11340 states and 35949 transitions. [2022-12-14 14:49:32,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 14:49:32,390 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-12-14 14:49:32,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:32,419 INFO L225 Difference]: With dead ends: 11340 [2022-12-14 14:49:32,419 INFO L226 Difference]: Without dead ends: 11340 [2022-12-14 14:49:32,419 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2022-12-14 14:49:32,420 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 345 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 1723 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 1742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1723 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:32,420 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [345 Valid, 162 Invalid, 1742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1723 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 14:49:32,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11340 states. [2022-12-14 14:49:32,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11340 to 8700. [2022-12-14 14:49:32,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8700 states, 8491 states have (on average 3.234248027323048) internal successors, (27462), 8699 states have internal predecessors, (27462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:32,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8700 states to 8700 states and 27462 transitions. [2022-12-14 14:49:32,626 INFO L78 Accepts]: Start accepts. Automaton has 8700 states and 27462 transitions. Word has length 11 [2022-12-14 14:49:32,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:32,627 INFO L495 AbstractCegarLoop]: Abstraction has 8700 states and 27462 transitions. [2022-12-14 14:49:32,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:32,627 INFO L276 IsEmpty]: Start isEmpty. Operand 8700 states and 27462 transitions. [2022-12-14 14:49:32,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 14:49:32,627 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:32,627 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:32,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-12-14 14:49:32,628 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:32,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:32,628 INFO L85 PathProgramCache]: Analyzing trace with hash -32736965, now seen corresponding path program 1 times [2022-12-14 14:49:32,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:32,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418237752] [2022-12-14 14:49:32,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:32,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:32,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:33,010 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:33,011 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:33,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418237752] [2022-12-14 14:49:33,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418237752] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:33,011 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:33,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-12-14 14:49:33,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034796016] [2022-12-14 14:49:33,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:33,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 14:49:33,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:33,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 14:49:33,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-12-14 14:49:33,012 INFO L87 Difference]: Start difference. First operand 8700 states and 27462 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:34,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:34,186 INFO L93 Difference]: Finished difference Result 9306 states and 29196 transitions. [2022-12-14 14:49:34,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 14:49:34,187 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-12-14 14:49:34,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:34,210 INFO L225 Difference]: With dead ends: 9306 [2022-12-14 14:49:34,210 INFO L226 Difference]: Without dead ends: 9306 [2022-12-14 14:49:34,210 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2022-12-14 14:49:34,211 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 493 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 1215 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 493 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 1230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:34,211 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [493 Valid, 114 Invalid, 1230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1215 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 14:49:34,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9306 states. [2022-12-14 14:49:34,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9306 to 8463. [2022-12-14 14:49:34,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8463 states, 8254 states have (on average 3.2224376060092075) internal successors, (26598), 8462 states have internal predecessors, (26598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:34,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8463 states to 8463 states and 26598 transitions. [2022-12-14 14:49:34,413 INFO L78 Accepts]: Start accepts. Automaton has 8463 states and 26598 transitions. Word has length 11 [2022-12-14 14:49:34,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:34,413 INFO L495 AbstractCegarLoop]: Abstraction has 8463 states and 26598 transitions. [2022-12-14 14:49:34,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:34,413 INFO L276 IsEmpty]: Start isEmpty. Operand 8463 states and 26598 transitions. [2022-12-14 14:49:34,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 14:49:34,414 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:34,414 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:34,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-12-14 14:49:34,414 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting reader_twoErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:34,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:34,415 INFO L85 PathProgramCache]: Analyzing trace with hash 572570681, now seen corresponding path program 1 times [2022-12-14 14:49:34,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:34,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285491267] [2022-12-14 14:49:34,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:34,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:34,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:34,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:34,534 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:34,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285491267] [2022-12-14 14:49:34,534 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1285491267] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:34,534 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:34,534 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:49:34,534 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96668905] [2022-12-14 14:49:34,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:34,535 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 14:49:34,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:34,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 14:49:34,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 14:49:34,536 INFO L87 Difference]: Start difference. First operand 8463 states and 26598 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:34,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:34,783 INFO L93 Difference]: Finished difference Result 7791 states and 24471 transitions. [2022-12-14 14:49:34,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 14:49:34,784 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-12-14 14:49:34,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:34,804 INFO L225 Difference]: With dead ends: 7791 [2022-12-14 14:49:34,804 INFO L226 Difference]: Without dead ends: 7791 [2022-12-14 14:49:34,804 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-12-14 14:49:34,805 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 222 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:34,805 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 21 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 14:49:34,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7791 states. [2022-12-14 14:49:34,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7791 to 7791. [2022-12-14 14:49:34,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7791 states, 7606 states have (on average 3.217328424927689) internal successors, (24471), 7790 states have internal predecessors, (24471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:34,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7791 states to 7791 states and 24471 transitions. [2022-12-14 14:49:34,968 INFO L78 Accepts]: Start accepts. Automaton has 7791 states and 24471 transitions. Word has length 13 [2022-12-14 14:49:34,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:34,969 INFO L495 AbstractCegarLoop]: Abstraction has 7791 states and 24471 transitions. [2022-12-14 14:49:34,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:34,969 INFO L276 IsEmpty]: Start isEmpty. Operand 7791 states and 24471 transitions. [2022-12-14 14:49:34,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 14:49:34,970 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:34,970 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:34,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-12-14 14:49:34,970 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:34,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:34,970 INFO L85 PathProgramCache]: Analyzing trace with hash 572570655, now seen corresponding path program 1 times [2022-12-14 14:49:34,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:34,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3230206] [2022-12-14 14:49:34,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:34,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:34,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:35,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:35,034 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:35,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3230206] [2022-12-14 14:49:35,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3230206] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:35,034 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:35,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:49:35,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205186850] [2022-12-14 14:49:35,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:35,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 14:49:35,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:35,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 14:49:35,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 14:49:35,036 INFO L87 Difference]: Start difference. First operand 7791 states and 24471 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:35,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:35,214 INFO L93 Difference]: Finished difference Result 7343 states and 23053 transitions. [2022-12-14 14:49:35,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 14:49:35,215 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-12-14 14:49:35,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:35,233 INFO L225 Difference]: With dead ends: 7343 [2022-12-14 14:49:35,233 INFO L226 Difference]: Without dead ends: 7343 [2022-12-14 14:49:35,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-12-14 14:49:35,234 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 169 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:35,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 31 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:49:35,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7343 states. [2022-12-14 14:49:35,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7343 to 7343. [2022-12-14 14:49:35,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7343 states, 7174 states have (on average 3.2134095344298856) internal successors, (23053), 7342 states have internal predecessors, (23053), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:35,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7343 states to 7343 states and 23053 transitions. [2022-12-14 14:49:35,390 INFO L78 Accepts]: Start accepts. Automaton has 7343 states and 23053 transitions. Word has length 13 [2022-12-14 14:49:35,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:35,390 INFO L495 AbstractCegarLoop]: Abstraction has 7343 states and 23053 transitions. [2022-12-14 14:49:35,391 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:35,391 INFO L276 IsEmpty]: Start isEmpty. Operand 7343 states and 23053 transitions. [2022-12-14 14:49:35,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 14:49:35,392 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:35,392 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:35,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-12-14 14:49:35,392 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:35,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:35,392 INFO L85 PathProgramCache]: Analyzing trace with hash 569821054, now seen corresponding path program 1 times [2022-12-14 14:49:35,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:35,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251588552] [2022-12-14 14:49:35,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:35,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:35,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:35,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:35,418 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:35,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251588552] [2022-12-14 14:49:35,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251588552] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:35,418 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:35,419 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:49:35,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435225143] [2022-12-14 14:49:35,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:35,419 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:49:35,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:35,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:49:35,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:49:35,419 INFO L87 Difference]: Start difference. First operand 7343 states and 23053 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:35,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:35,578 INFO L93 Difference]: Finished difference Result 10809 states and 34441 transitions. [2022-12-14 14:49:35,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:49:35,579 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 14:49:35,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:35,607 INFO L225 Difference]: With dead ends: 10809 [2022-12-14 14:49:35,607 INFO L226 Difference]: Without dead ends: 10809 [2022-12-14 14:49:35,607 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:49:35,608 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 49 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:35,608 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 58 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:49:35,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10809 states. [2022-12-14 14:49:35,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10809 to 7575. [2022-12-14 14:49:35,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7575 states, 7406 states have (on average 3.2572238725357816) internal successors, (24123), 7574 states have internal predecessors, (24123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:35,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7575 states to 7575 states and 24123 transitions. [2022-12-14 14:49:35,799 INFO L78 Accepts]: Start accepts. Automaton has 7575 states and 24123 transitions. Word has length 14 [2022-12-14 14:49:35,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:35,799 INFO L495 AbstractCegarLoop]: Abstraction has 7575 states and 24123 transitions. [2022-12-14 14:49:35,799 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:35,800 INFO L276 IsEmpty]: Start isEmpty. Operand 7575 states and 24123 transitions. [2022-12-14 14:49:35,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 14:49:35,801 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:35,801 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:35,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-12-14 14:49:35,801 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:35,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:35,801 INFO L85 PathProgramCache]: Analyzing trace with hash -434865505, now seen corresponding path program 1 times [2022-12-14 14:49:35,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:35,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531716615] [2022-12-14 14:49:35,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:35,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:35,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:35,848 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:35,848 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:35,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531716615] [2022-12-14 14:49:35,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531716615] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:49:35,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965674285] [2022-12-14 14:49:35,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:35,849 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:49:35,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:49:35,850 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:49:35,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 14:49:35,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:35,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 14:49:35,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:49:35,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:35,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:49:35,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:35,999 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965674285] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:49:36,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [41191945] [2022-12-14 14:49:36,008 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 14:49:36,010 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:49:36,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-12-14 14:49:36,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621965004] [2022-12-14 14:49:36,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:49:36,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 14:49:36,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:36,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 14:49:36,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2022-12-14 14:49:36,012 INFO L87 Difference]: Start difference. First operand 7575 states and 24123 transitions. Second operand has 7 states, 6 states have (on average 5.5) internal successors, (33), 7 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:36,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:36,430 INFO L93 Difference]: Finished difference Result 20010 states and 63518 transitions. [2022-12-14 14:49:36,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 14:49:36,431 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.5) internal successors, (33), 7 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 14:49:36,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:36,493 INFO L225 Difference]: With dead ends: 20010 [2022-12-14 14:49:36,493 INFO L226 Difference]: Without dead ends: 20010 [2022-12-14 14:49:36,494 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2022-12-14 14:49:36,494 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 427 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 427 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:36,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [427 Valid, 182 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 282 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 14:49:36,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20010 states. [2022-12-14 14:49:36,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20010 to 18342. [2022-12-14 14:49:36,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18342 states, 18173 states have (on average 3.3214659109668188) internal successors, (60361), 18341 states have internal predecessors, (60361), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:36,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18342 states to 18342 states and 60361 transitions. [2022-12-14 14:49:36,949 INFO L78 Accepts]: Start accepts. Automaton has 18342 states and 60361 transitions. Word has length 14 [2022-12-14 14:49:36,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:36,950 INFO L495 AbstractCegarLoop]: Abstraction has 18342 states and 60361 transitions. [2022-12-14 14:49:36,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.5) internal successors, (33), 7 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:36,950 INFO L276 IsEmpty]: Start isEmpty. Operand 18342 states and 60361 transitions. [2022-12-14 14:49:36,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 14:49:36,951 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:36,951 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:36,957 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 14:49:37,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 14:49:37,153 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting reader_twoErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:37,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:37,154 INFO L85 PathProgramCache]: Analyzing trace with hash 484643927, now seen corresponding path program 1 times [2022-12-14 14:49:37,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:37,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759030153] [2022-12-14 14:49:37,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:37,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:37,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:37,478 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:37,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:37,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759030153] [2022-12-14 14:49:37,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759030153] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:37,478 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:37,478 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 14:49:37,478 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801613104] [2022-12-14 14:49:37,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:37,479 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 14:49:37,479 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:37,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 14:49:37,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-12-14 14:49:37,480 INFO L87 Difference]: Start difference. First operand 18342 states and 60361 transitions. Second operand has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:37,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:37,909 INFO L93 Difference]: Finished difference Result 18289 states and 60147 transitions. [2022-12-14 14:49:37,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 14:49:37,909 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-12-14 14:49:37,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:37,956 INFO L225 Difference]: With dead ends: 18289 [2022-12-14 14:49:37,956 INFO L226 Difference]: Without dead ends: 18288 [2022-12-14 14:49:37,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2022-12-14 14:49:37,957 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 58 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 511 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:37,957 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 118 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 511 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 14:49:37,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18288 states. [2022-12-14 14:49:38,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18288 to 18288. [2022-12-14 14:49:38,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18288 states, 18113 states have (on average 3.320543256224811) internal successors, (60145), 18287 states have internal predecessors, (60145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:38,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18288 states to 18288 states and 60145 transitions. [2022-12-14 14:49:38,290 INFO L78 Accepts]: Start accepts. Automaton has 18288 states and 60145 transitions. Word has length 15 [2022-12-14 14:49:38,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:38,291 INFO L495 AbstractCegarLoop]: Abstraction has 18288 states and 60145 transitions. [2022-12-14 14:49:38,291 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:38,291 INFO L276 IsEmpty]: Start isEmpty. Operand 18288 states and 60145 transitions. [2022-12-14 14:49:38,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 14:49:38,292 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:38,292 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:38,292 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-12-14 14:49:38,292 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting reader_twoErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:38,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:38,293 INFO L85 PathProgramCache]: Analyzing trace with hash -1274169433, now seen corresponding path program 1 times [2022-12-14 14:49:38,293 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:38,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808109302] [2022-12-14 14:49:38,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:38,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:38,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:38,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:38,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:38,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808109302] [2022-12-14 14:49:38,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808109302] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:38,556 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:38,556 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 14:49:38,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472837593] [2022-12-14 14:49:38,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:38,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 14:49:38,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:38,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 14:49:38,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-12-14 14:49:38,557 INFO L87 Difference]: Start difference. First operand 18288 states and 60145 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:39,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:39,051 INFO L93 Difference]: Finished difference Result 18853 states and 61518 transitions. [2022-12-14 14:49:39,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 14:49:39,051 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-12-14 14:49:39,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:39,102 INFO L225 Difference]: With dead ends: 18853 [2022-12-14 14:49:39,102 INFO L226 Difference]: Without dead ends: 18852 [2022-12-14 14:49:39,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2022-12-14 14:49:39,103 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 183 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 603 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 603 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:39,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 106 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 603 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 14:49:39,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18852 states. [2022-12-14 14:49:39,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18852 to 18343. [2022-12-14 14:49:39,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18343 states, 18168 states have (on average 3.321994715984148) internal successors, (60354), 18342 states have internal predecessors, (60354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:39,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18343 states to 18343 states and 60354 transitions. [2022-12-14 14:49:39,418 INFO L78 Accepts]: Start accepts. Automaton has 18343 states and 60354 transitions. Word has length 16 [2022-12-14 14:49:39,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:39,418 INFO L495 AbstractCegarLoop]: Abstraction has 18343 states and 60354 transitions. [2022-12-14 14:49:39,418 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:39,419 INFO L276 IsEmpty]: Start isEmpty. Operand 18343 states and 60354 transitions. [2022-12-14 14:49:39,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 14:49:39,420 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:39,420 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:39,420 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-12-14 14:49:39,420 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting reader_twoErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:39,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:39,421 INFO L85 PathProgramCache]: Analyzing trace with hash 2139094587, now seen corresponding path program 2 times [2022-12-14 14:49:39,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:39,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234126302] [2022-12-14 14:49:39,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:39,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:39,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:39,674 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:39,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:39,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234126302] [2022-12-14 14:49:39,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234126302] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:39,674 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:39,674 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 14:49:39,674 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212550858] [2022-12-14 14:49:39,675 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:39,675 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 14:49:39,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:39,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 14:49:39,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-12-14 14:49:39,676 INFO L87 Difference]: Start difference. First operand 18343 states and 60354 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:40,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:40,208 INFO L93 Difference]: Finished difference Result 18255 states and 59368 transitions. [2022-12-14 14:49:40,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 14:49:40,208 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-12-14 14:49:40,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:40,262 INFO L225 Difference]: With dead ends: 18255 [2022-12-14 14:49:40,262 INFO L226 Difference]: Without dead ends: 18254 [2022-12-14 14:49:40,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2022-12-14 14:49:40,263 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 143 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:40,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 106 Invalid, 606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 14:49:40,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18254 states. [2022-12-14 14:49:40,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18254 to 17714. [2022-12-14 14:49:40,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17714 states, 17539 states have (on average 3.3102229317520955) internal successors, (58058), 17713 states have internal predecessors, (58058), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:40,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17714 states to 17714 states and 58058 transitions. [2022-12-14 14:49:40,564 INFO L78 Accepts]: Start accepts. Automaton has 17714 states and 58058 transitions. Word has length 16 [2022-12-14 14:49:40,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:40,564 INFO L495 AbstractCegarLoop]: Abstraction has 17714 states and 58058 transitions. [2022-12-14 14:49:40,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:40,564 INFO L276 IsEmpty]: Start isEmpty. Operand 17714 states and 58058 transitions. [2022-12-14 14:49:40,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 14:49:40,566 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:40,566 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:40,566 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-12-14 14:49:40,566 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:40,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:40,566 INFO L85 PathProgramCache]: Analyzing trace with hash -1699214253, now seen corresponding path program 1 times [2022-12-14 14:49:40,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:40,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454356318] [2022-12-14 14:49:40,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:40,567 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:40,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:40,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:40,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:40,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454356318] [2022-12-14 14:49:40,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454356318] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:40,604 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:40,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:49:40,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950721090] [2022-12-14 14:49:40,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:40,605 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:49:40,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:40,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:49:40,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:49:40,605 INFO L87 Difference]: Start difference. First operand 17714 states and 58058 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:40,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:40,699 INFO L93 Difference]: Finished difference Result 6929 states and 19387 transitions. [2022-12-14 14:49:40,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:49:40,699 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-12-14 14:49:40,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:40,711 INFO L225 Difference]: With dead ends: 6929 [2022-12-14 14:49:40,711 INFO L226 Difference]: Without dead ends: 6929 [2022-12-14 14:49:40,711 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:49:40,712 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 65 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:40,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 47 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:49:40,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6929 states. [2022-12-14 14:49:40,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6929 to 6806. [2022-12-14 14:49:40,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6806 states, 6673 states have (on average 2.888655777011839) internal successors, (19276), 6805 states have internal predecessors, (19276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:40,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6806 states to 6806 states and 19276 transitions. [2022-12-14 14:49:40,808 INFO L78 Accepts]: Start accepts. Automaton has 6806 states and 19276 transitions. Word has length 16 [2022-12-14 14:49:40,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:40,808 INFO L495 AbstractCegarLoop]: Abstraction has 6806 states and 19276 transitions. [2022-12-14 14:49:40,808 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:49:40,808 INFO L276 IsEmpty]: Start isEmpty. Operand 6806 states and 19276 transitions. [2022-12-14 14:49:40,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 14:49:40,809 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:40,809 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:40,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-12-14 14:49:40,810 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting writer_fnErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2022-12-14 14:49:40,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:40,810 INFO L85 PathProgramCache]: Analyzing trace with hash 1217303576, now seen corresponding path program 1 times [2022-12-14 14:49:40,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:40,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40400888] [2022-12-14 14:49:40,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:40,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:40,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:41,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:41,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:41,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40400888] [2022-12-14 14:49:41,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40400888] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:49:41,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162181339] [2022-12-14 14:49:41,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:41,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:49:41,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:49:41,269 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:49:41,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3d813b7-c906-41a2-bc7d-499353ac21ef/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 14:49:41,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:41,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 14:49:41,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:49:41,497 INFO L321 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2022-12-14 14:49:41,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 31 [2022-12-14 14:49:41,699 INFO L321 Elim1Store]: treesize reduction 19, result has 60.4 percent of original size [2022-12-14 14:49:41,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 63 treesize of output 60 [2022-12-14 14:49:41,914 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 14:49:41,915 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 10 [2022-12-14 14:49:41,947 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:49:41,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:49:42,036 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 36 [2022-12-14 14:49:43,453 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 14:49:43,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 570 treesize of output 562 [2022-12-14 14:50:15,546 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2022-12-14 14:50:15,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2022-12-14 14:50:15,636 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2022-12-14 14:50:15,766 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2022-12-14 14:50:15,781 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,788 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,795 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,801 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,808 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,815 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,823 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,830 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,837 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,845 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,852 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,859 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,865 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,872 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,876 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,882 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,889 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,896 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,900 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,905 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,912 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,919 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,926 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,933 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,937 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,944 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,952 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,959 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,965 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,969 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,975 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,984 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,990 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,995 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:15,999 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,006 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,010 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,019 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,025 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,032 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,039 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,045 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,052 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,056 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,061 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,066 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,070 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,075 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,079 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,085 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,090 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,094 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,098 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,104 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,107 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,111 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,116 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,120 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,125 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,130 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,133 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,138 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,145 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,150 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:16,155 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-12-14 14:50:17,794 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 14:50:17,795 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 892 treesize of output 1324 [2022-12-14 14:50:31,451 WARN L718 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2022-12-14 14:51:00,704 WARN L718 sPolynomialRelations]: Constructing 128(two to the power of 7 dual juncts. [2022-12-14 14:53:14,206 WARN L718 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2022-12-14 14:54:02,393 WARN L718 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2022-12-14 14:55:38,643 WARN L718 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2022-12-14 14:56:32,881 WARN L718 sPolynomialRelations]: Constructing 128(two to the power of 7 dual juncts. [2022-12-14 14:59:15,799 WARN L718 sPolynomialRelations]: Constructing 128(two to the power of 7 dual juncts. [2022-12-14 15:02:16,254 WARN L718 sPolynomialRelations]: Constructing 256(two to the power of 8 dual juncts.