./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-validator-v0.6/linux-stable-39a1d13-1-101_1a-drivers--block--virtio_blk.ko-entry_point.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff 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_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-validator-v0.6/linux-stable-39a1d13-1-101_1a-drivers--block--virtio_blk.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash e621fe5569ce23da8663d1ba84e0ea76474750cbbbe06c56ff4e5d6732ec9411 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:19:23,551 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:19:23,689 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-64bit-Taipan_Default.epf [2023-11-19 05:19:23,698 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:19:23,699 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:19:23,722 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:19:23,723 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:19:23,723 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:19:23,724 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:19:23,725 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:19:23,725 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:19:23,726 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:19:23,726 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:19:23,727 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:19:23,727 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:19:23,728 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:19:23,728 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:19:23,729 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:19:23,729 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:19:23,730 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:19:23,730 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:19:23,733 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:19:23,734 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:19:23,734 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:19:23,735 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:19:23,735 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:19:23,736 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:19:23,736 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:19:23,736 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:19:23,737 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:19:23,738 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:19:23,738 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:19:23,738 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:19:23,739 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:19:23,739 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:19:23,739 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:19:23,739 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:19:23,740 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:19:23,740 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:19:23,740 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:19:23,740 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:19:23,741 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:19:23,741 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e621fe5569ce23da8663d1ba84e0ea76474750cbbbe06c56ff4e5d6732ec9411 [2023-11-19 05:19:24,068 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:19:24,101 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:19:24,104 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:19:24,105 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:19:24,105 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:19:24,107 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/ldv-validator-v0.6/linux-stable-39a1d13-1-101_1a-drivers--block--virtio_blk.ko-entry_point.cil.out.i [2023-11-19 05:19:27,284 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:19:28,055 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:19:28,057 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/sv-benchmarks/c/ldv-validator-v0.6/linux-stable-39a1d13-1-101_1a-drivers--block--virtio_blk.ko-entry_point.cil.out.i [2023-11-19 05:19:28,104 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/data/901e241d7/26ab048765e44cfd8adb22a587a2e355/FLAG3a469ddcc [2023-11-19 05:19:28,125 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/data/901e241d7/26ab048765e44cfd8adb22a587a2e355 [2023-11-19 05:19:28,133 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:19:28,135 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:19:28,138 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:19:28,138 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:19:28,145 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:19:28,146 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:19:28" (1/1) ... [2023-11-19 05:19:28,147 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3346ec87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:28, skipping insertion in model container [2023-11-19 05:19:28,148 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:19:28" (1/1) ... [2023-11-19 05:19:28,311 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:19:29,286 WARN L240 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_e6491468-08e1-4955-a992-7541d8ca56f3/sv-benchmarks/c/ldv-validator-v0.6/linux-stable-39a1d13-1-101_1a-drivers--block--virtio_blk.ko-entry_point.cil.out.i[100586,100599] [2023-11-19 05:19:29,543 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:19:29,572 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:19:29,744 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring inline assembler instruction C: __asm__ volatile ("bt %2,%1\n\tsbb %0,%0": "=r" (oldbit): "m" (*((unsigned long *)addr)), "Ir" (nr)); [3095-3096] [2023-11-19 05:19:29,820 WARN L240 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_e6491468-08e1-4955-a992-7541d8ca56f3/sv-benchmarks/c/ldv-validator-v0.6/linux-stable-39a1d13-1-101_1a-drivers--block--virtio_blk.ko-entry_point.cil.out.i[100586,100599] [2023-11-19 05:19:29,823 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring inline assembler instruction C: __asm__ volatile ("1:\tud2\n.pushsection __bug_table,\"a\"\n2:\t.long 1b - 2b, %c0 - 2b\n\t.word %c1, 0\n\t.org 2b+%c2\n.popsection": : "i" ((char *)"include/linux/scatterlist.h"), "i" (63), "i" (12UL)); [3611-3612] [2023-11-19 05:19:29,832 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring inline assembler instruction C: __asm__ volatile ("1:\tud2\n.pushsection __bug_table,\"a\"\n2:\t.long 1b - 2b, %c0 - 2b\n\t.word %c1, 0\n\t.org 2b+%c2\n.popsection": : "i" ((char *)"include/linux/scatterlist.h"), "i" (65), "i" (12UL)); [3619-3620] [2023-11-19 05:19:29,833 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring inline assembler instruction C: __asm__ volatile ("1:\tud2\n.pushsection __bug_table,\"a\"\n2:\t.long 1b - 2b, %c0 - 2b\n\t.word %c1, 0\n\t.org 2b+%c2\n.popsection": : "i" ((char *)"include/linux/scatterlist.h"), "i" (66), "i" (12UL)); [3627-3628] [2023-11-19 05:19:29,894 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring inline assembler instruction C: __asm__ volatile ("1:\tud2\n.pushsection __bug_table,\"a\"\n2:\t.long 1b - 2b, %c0 - 2b\n\t.word %c1, 0\n\t.org 2b+%c2\n.popsection": : "i" ((char *)"/home/ldvuser/gratinskiy/commit-tester-runs/6-cpa-svcomp-newdeg/commit-tester-work/task-011--linux-stable--dir/work/current--X--drivers/block/virtio_blk.ko--X--defaultlinux-stable-39a1d13-1--X--101_1a--X--cpachecker/linux-stable-39a1d13-1/csd_deg_dscv/11/dscv_tempdir/dscv/ri/101_1a/drivers/block/virtio_blk.o.c.prepared"), "i" (151), "i" (12UL)); [3842-3843] [2023-11-19 05:19:29,914 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring inline assembler instruction C: __asm__ volatile ("1:\tud2\n.pushsection __bug_table,\"a\"\n2:\t.long 1b - 2b, %c0 - 2b\n\t.word %c1, 0\n\t.org 2b+%c2\n.popsection": : "i" ((char *)"/home/ldvuser/gratinskiy/commit-tester-runs/6-cpa-svcomp-newdeg/commit-tester-work/task-011--linux-stable--dir/work/current--X--drivers/block/virtio_blk.ko--X--defaultlinux-stable-39a1d13-1--X--101_1a--X--cpachecker/linux-stable-39a1d13-1/csd_deg_dscv/11/dscv_tempdir/dscv/ri/101_1a/drivers/block/virtio_blk.o.c.prepared"), "i" (205), "i" (12UL)); [3917-3918] [2023-11-19 05:19:30,142 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring inline assembler instruction C: __asm__ volatile ("1:\tud2\n.pushsection __bug_table,\"a\"\n2:\t.long 1b - 2b, %c0 - 2b\n\t.word %c1, 0\n\t.org 2b+%c2\n.popsection": : "i" ((char *)"/home/ldvuser/gratinskiy/commit-tester-runs/6-cpa-svcomp-newdeg/commit-tester-work/task-011--linux-stable--dir/work/current--X--drivers/block/virtio_blk.ko--X--defaultlinux-stable-39a1d13-1--X--101_1a--X--cpachecker/linux-stable-39a1d13-1/csd_deg_dscv/11/dscv_tempdir/dscv/ri/101_1a/drivers/block/virtio_blk.o.c.prepared"), "i" (495), "i" (12UL)); [4238-4239] [2023-11-19 05:19:30,203 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:19:30,260 WARN L675 CHandler]: The function kmem_cache_alloc_notrace is called, but not defined or handled by StandardFunctionHandler. [2023-11-19 05:19:30,260 WARN L675 CHandler]: The function sprintf is called, but not defined or handled by StandardFunctionHandler. [2023-11-19 05:19:30,269 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:19:30,270 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30 WrapperNode [2023-11-19 05:19:30,270 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:19:30,272 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:19:30,272 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:19:30,272 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:19:30,282 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,370 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,519 INFO L138 Inliner]: procedures = 155, calls = 555, calls flagged for inlining = 94, calls inlined = 94, statements flattened = 1961 [2023-11-19 05:19:30,520 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:19:30,521 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:19:30,521 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:19:30,521 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:19:30,532 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,533 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,572 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,573 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,674 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,688 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,713 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,740 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,776 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:19:30,778 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:19:30,778 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:19:30,778 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:19:30,779 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (1/1) ... [2023-11-19 05:19:30,791 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:19:30,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:30,823 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:19:30,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:19:30,872 INFO L130 BoogieDeclarations]: Found specification of procedure blk_queue_max_segment_size [2023-11-19 05:19:30,872 INFO L138 BoogieDeclarations]: Found implementation of procedure blk_queue_max_segment_size [2023-11-19 05:19:30,873 INFO L130 BoogieDeclarations]: Found specification of procedure virtio_config_buf [2023-11-19 05:19:30,873 INFO L138 BoogieDeclarations]: Found implementation of procedure virtio_config_buf [2023-11-19 05:19:30,873 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2023-11-19 05:19:30,873 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2023-11-19 05:19:30,873 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:19:30,874 INFO L130 BoogieDeclarations]: Found specification of procedure req_get_ioprio [2023-11-19 05:19:30,874 INFO L138 BoogieDeclarations]: Found implementation of procedure req_get_ioprio [2023-11-19 05:19:30,874 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~X~int~X~$Pointer$~X~int~TO~VOID [2023-11-19 05:19:30,874 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~X~int~X~$Pointer$~X~int~TO~VOID [2023-11-19 05:19:30,875 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2023-11-19 05:19:30,875 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2023-11-19 05:19:30,875 INFO L130 BoogieDeclarations]: Found specification of procedure mempool_free [2023-11-19 05:19:30,876 INFO L138 BoogieDeclarations]: Found implementation of procedure mempool_free [2023-11-19 05:19:30,877 INFO L130 BoogieDeclarations]: Found specification of procedure sg_set_buf [2023-11-19 05:19:30,877 INFO L138 BoogieDeclarations]: Found implementation of procedure sg_set_buf [2023-11-19 05:19:30,877 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2023-11-19 05:19:30,878 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2023-11-19 05:19:30,878 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:19:30,879 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2023-11-19 05:19:30,879 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2023-11-19 05:19:30,880 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2023-11-19 05:19:30,880 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2023-11-19 05:19:30,880 INFO L130 BoogieDeclarations]: Found specification of procedure index_to_minor [2023-11-19 05:19:30,880 INFO L138 BoogieDeclarations]: Found implementation of procedure index_to_minor [2023-11-19 05:19:30,881 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-19 05:19:30,881 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-19 05:19:30,881 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:19:30,881 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop___0 [2023-11-19 05:19:30,881 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop___0 [2023-11-19 05:19:30,882 INFO L130 BoogieDeclarations]: Found specification of procedure kmem_cache_alloc_notrace [2023-11-19 05:19:30,882 INFO L130 BoogieDeclarations]: Found specification of procedure spinlock_check [2023-11-19 05:19:30,882 INFO L138 BoogieDeclarations]: Found implementation of procedure spinlock_check [2023-11-19 05:19:30,882 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:19:30,882 INFO L130 BoogieDeclarations]: Found specification of procedure virtio_has_feature [2023-11-19 05:19:30,883 INFO L138 BoogieDeclarations]: Found implementation of procedure virtio_has_feature [2023-11-19 05:19:30,883 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:19:30,883 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 05:19:30,883 INFO L130 BoogieDeclarations]: Found specification of procedure sprintf [2023-11-19 05:19:30,883 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~TO~VOID [2023-11-19 05:19:30,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~TO~VOID [2023-11-19 05:19:30,884 INFO L130 BoogieDeclarations]: Found specification of procedure virtblk_remove [2023-11-19 05:19:30,884 INFO L138 BoogieDeclarations]: Found implementation of procedure virtblk_remove [2023-11-19 05:19:30,884 INFO L130 BoogieDeclarations]: Found specification of procedure mempool_destroy [2023-11-19 05:19:30,884 INFO L138 BoogieDeclarations]: Found implementation of procedure mempool_destroy [2023-11-19 05:19:30,884 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 05:19:30,885 INFO L130 BoogieDeclarations]: Found specification of procedure rcu_read_lock_sched_notrace [2023-11-19 05:19:30,885 INFO L138 BoogieDeclarations]: Found implementation of procedure rcu_read_lock_sched_notrace [2023-11-19 05:19:30,885 INFO L130 BoogieDeclarations]: Found specification of procedure PTR_ERR [2023-11-19 05:19:30,885 INFO L138 BoogieDeclarations]: Found implementation of procedure PTR_ERR [2023-11-19 05:19:30,885 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_is_err [2023-11-19 05:19:30,886 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_is_err [2023-11-19 05:19:30,886 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:19:30,886 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-19 05:19:30,887 INFO L130 BoogieDeclarations]: Found specification of procedure trace_kmalloc [2023-11-19 05:19:30,888 INFO L138 BoogieDeclarations]: Found implementation of procedure trace_kmalloc [2023-11-19 05:19:30,888 INFO L130 BoogieDeclarations]: Found specification of procedure put_disk [2023-11-19 05:19:30,889 INFO L138 BoogieDeclarations]: Found implementation of procedure put_disk [2023-11-19 05:19:30,889 INFO L130 BoogieDeclarations]: Found specification of procedure blk_queue_ordered [2023-11-19 05:19:30,889 INFO L138 BoogieDeclarations]: Found implementation of procedure blk_queue_ordered [2023-11-19 05:19:30,890 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:19:30,890 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_zalloc [2023-11-19 05:19:30,890 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_zalloc [2023-11-19 05:19:30,890 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:19:30,891 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:19:30,892 INFO L130 BoogieDeclarations]: Found specification of procedure IS_ERR [2023-11-19 05:19:30,892 INFO L138 BoogieDeclarations]: Found implementation of procedure IS_ERR [2023-11-19 05:19:31,532 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:19:31,537 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:19:32,236 INFO L767 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2023-11-19 05:19:32,344 INFO L767 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stop___0FINAL: assume true; [2023-11-19 05:19:33,464 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:19:34,631 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:19:34,631 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-19 05:19:34,645 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:19:34 BoogieIcfgContainer [2023-11-19 05:19:34,645 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:19:34,649 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:19:34,649 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:19:34,653 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:19:34,653 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:19:28" (1/3) ... [2023-11-19 05:19:34,654 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39f7211e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:19:34, skipping insertion in model container [2023-11-19 05:19:34,655 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:30" (2/3) ... [2023-11-19 05:19:34,655 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39f7211e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:19:34, skipping insertion in model container [2023-11-19 05:19:34,655 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:19:34" (3/3) ... [2023-11-19 05:19:34,657 INFO L112 eAbstractionObserver]: Analyzing ICFG linux-stable-39a1d13-1-101_1a-drivers--block--virtio_blk.ko-entry_point.cil.out.i [2023-11-19 05:19:34,682 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:19:34,683 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:19:34,758 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:19:34,766 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@29047feb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:19:34,766 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:19:34,774 INFO L276 IsEmpty]: Start isEmpty. Operand has 325 states, 210 states have (on average 1.3428571428571427) internal successors, (282), 223 states have internal predecessors, (282), 88 states have call successors, (88), 27 states have call predecessors, (88), 25 states have return successors, (83), 83 states have call predecessors, (83), 83 states have call successors, (83) [2023-11-19 05:19:34,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-19 05:19:34,787 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:34,788 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:34,789 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:34,795 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:34,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1236850561, now seen corresponding path program 1 times [2023-11-19 05:19:34,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:34,809 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185921409] [2023-11-19 05:19:34,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:34,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:35,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:35,449 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:35,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:35,450 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185921409] [2023-11-19 05:19:35,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185921409] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:35,451 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:35,452 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:19:35,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371142904] [2023-11-19 05:19:35,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:35,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:19:35,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:35,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:19:35,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:19:35,520 INFO L87 Difference]: Start difference. First operand has 325 states, 210 states have (on average 1.3428571428571427) internal successors, (282), 223 states have internal predecessors, (282), 88 states have call successors, (88), 27 states have call predecessors, (88), 25 states have return successors, (83), 83 states have call predecessors, (83), 83 states have call successors, (83) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:19:36,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:36,481 INFO L93 Difference]: Finished difference Result 900 states and 1255 transitions. [2023-11-19 05:19:36,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:19:36,484 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-11-19 05:19:36,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:36,508 INFO L225 Difference]: With dead ends: 900 [2023-11-19 05:19:36,508 INFO L226 Difference]: Without dead ends: 551 [2023-11-19 05:19:36,519 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 [2023-11-19 05:19:36,523 INFO L413 NwaCegarLoop]: 344 mSDtfsCounter, 377 mSDsluCounter, 338 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 377 SdHoareTripleChecker+Valid, 682 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:36,525 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [377 Valid, 682 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-19 05:19:36,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2023-11-19 05:19:36,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 548. [2023-11-19 05:19:36,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 356 states have (on average 1.2696629213483146) internal successors, (452), 365 states have internal predecessors, (452), 148 states have call successors, (148), 44 states have call predecessors, (148), 43 states have return successors, (146), 146 states have call predecessors, (146), 146 states have call successors, (146) [2023-11-19 05:19:36,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 746 transitions. [2023-11-19 05:19:36,697 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 746 transitions. Word has length 18 [2023-11-19 05:19:36,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:36,698 INFO L495 AbstractCegarLoop]: Abstraction has 548 states and 746 transitions. [2023-11-19 05:19:36,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:19:36,699 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 746 transitions. [2023-11-19 05:19:36,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:19:36,701 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:36,702 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:36,702 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:19:36,703 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:36,704 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:36,704 INFO L85 PathProgramCache]: Analyzing trace with hash 561207668, now seen corresponding path program 1 times [2023-11-19 05:19:36,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:36,705 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749482625] [2023-11-19 05:19:36,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:36,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:36,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:36,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:36,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:36,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749482625] [2023-11-19 05:19:36,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [749482625] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:36,920 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:36,920 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:19:36,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744640066] [2023-11-19 05:19:36,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:36,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:19:36,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:36,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:19:36,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:19:36,924 INFO L87 Difference]: Start difference. First operand 548 states and 746 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:19:37,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:37,571 INFO L93 Difference]: Finished difference Result 1070 states and 1454 transitions. [2023-11-19 05:19:37,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:19:37,571 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2023-11-19 05:19:37,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:37,580 INFO L225 Difference]: With dead ends: 1070 [2023-11-19 05:19:37,581 INFO L226 Difference]: Without dead ends: 1064 [2023-11-19 05:19:37,582 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 [2023-11-19 05:19:37,583 INFO L413 NwaCegarLoop]: 319 mSDtfsCounter, 362 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 626 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:37,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [362 Valid, 626 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 05:19:37,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1064 states. [2023-11-19 05:19:37,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1064 to 1064. [2023-11-19 05:19:37,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1064 states, 692 states have (on average 1.2658959537572254) internal successors, (876), 709 states have internal predecessors, (876), 285 states have call successors, (285), 87 states have call predecessors, (285), 86 states have return successors, (283), 283 states have call predecessors, (283), 283 states have call successors, (283) [2023-11-19 05:19:37,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 1444 transitions. [2023-11-19 05:19:37,660 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 1444 transitions. Word has length 21 [2023-11-19 05:19:37,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:37,660 INFO L495 AbstractCegarLoop]: Abstraction has 1064 states and 1444 transitions. [2023-11-19 05:19:37,661 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:19:37,661 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 1444 transitions. [2023-11-19 05:19:37,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-11-19 05:19:37,669 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:37,669 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:37,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:19:37,670 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:37,670 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:37,670 INFO L85 PathProgramCache]: Analyzing trace with hash 1187275267, now seen corresponding path program 1 times [2023-11-19 05:19:37,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:37,671 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894260007] [2023-11-19 05:19:37,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:37,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:37,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:37,812 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:19:37,813 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:37,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894260007] [2023-11-19 05:19:37,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894260007] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:37,813 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:37,814 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:19:37,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104937568] [2023-11-19 05:19:37,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:37,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:19:37,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:37,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:19:37,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:19:37,817 INFO L87 Difference]: Start difference. First operand 1064 states and 1444 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-19 05:19:38,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:38,593 INFO L93 Difference]: Finished difference Result 3058 states and 4130 transitions. [2023-11-19 05:19:38,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:19:38,595 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 68 [2023-11-19 05:19:38,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:38,611 INFO L225 Difference]: With dead ends: 3058 [2023-11-19 05:19:38,612 INFO L226 Difference]: Without dead ends: 1998 [2023-11-19 05:19:38,617 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 [2023-11-19 05:19:38,618 INFO L413 NwaCegarLoop]: 329 mSDtfsCounter, 326 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 638 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:38,619 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [326 Valid, 638 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 05:19:38,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1998 states. [2023-11-19 05:19:38,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1998 to 1993. [2023-11-19 05:19:38,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1993 states, 1289 states have (on average 1.2583397982932505) internal successors, (1622), 1322 states have internal predecessors, (1622), 532 states have call successors, (532), 172 states have call predecessors, (532), 171 states have return successors, (530), 530 states have call predecessors, (530), 530 states have call successors, (530) [2023-11-19 05:19:38,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1993 states to 1993 states and 2684 transitions. [2023-11-19 05:19:38,797 INFO L78 Accepts]: Start accepts. Automaton has 1993 states and 2684 transitions. Word has length 68 [2023-11-19 05:19:38,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:38,800 INFO L495 AbstractCegarLoop]: Abstraction has 1993 states and 2684 transitions. [2023-11-19 05:19:38,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-19 05:19:38,800 INFO L276 IsEmpty]: Start isEmpty. Operand 1993 states and 2684 transitions. [2023-11-19 05:19:38,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-19 05:19:38,810 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:38,810 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:38,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:19:38,811 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:38,812 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:38,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1575884974, now seen corresponding path program 1 times [2023-11-19 05:19:38,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:38,812 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111988190] [2023-11-19 05:19:38,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:38,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:38,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:39,424 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-11-19 05:19:39,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:39,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111988190] [2023-11-19 05:19:39,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111988190] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:39,425 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:39,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:19:39,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190777109] [2023-11-19 05:19:39,426 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:39,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:19:39,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:39,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:19:39,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:19:39,428 INFO L87 Difference]: Start difference. First operand 1993 states and 2684 transitions. Second operand has 5 states, 5 states have (on average 10.6) internal successors, (53), 4 states have internal predecessors, (53), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 2 states have call successors, (9) [2023-11-19 05:19:40,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:40,438 INFO L93 Difference]: Finished difference Result 3047 states and 4143 transitions. [2023-11-19 05:19:40,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:19:40,439 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.6) internal successors, (53), 4 states have internal predecessors, (53), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 2 states have call successors, (9) Word has length 86 [2023-11-19 05:19:40,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:40,463 INFO L225 Difference]: With dead ends: 3047 [2023-11-19 05:19:40,463 INFO L226 Difference]: Without dead ends: 2009 [2023-11-19 05:19:40,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:19:40,475 INFO L413 NwaCegarLoop]: 319 mSDtfsCounter, 0 mSDsluCounter, 951 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1270 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:40,479 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 1270 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-19 05:19:40,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2009 states. [2023-11-19 05:19:40,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2009 to 1997. [2023-11-19 05:19:40,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1997 states, 1291 states have (on average 1.2579395817195973) internal successors, (1624), 1326 states have internal predecessors, (1624), 532 states have call successors, (532), 172 states have call predecessors, (532), 173 states have return successors, (546), 530 states have call predecessors, (546), 530 states have call successors, (546) [2023-11-19 05:19:40,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1997 states to 1997 states and 2702 transitions. [2023-11-19 05:19:40,647 INFO L78 Accepts]: Start accepts. Automaton has 1997 states and 2702 transitions. Word has length 86 [2023-11-19 05:19:40,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:40,649 INFO L495 AbstractCegarLoop]: Abstraction has 1997 states and 2702 transitions. [2023-11-19 05:19:40,650 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.6) internal successors, (53), 4 states have internal predecessors, (53), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 2 states have call successors, (9) [2023-11-19 05:19:40,650 INFO L276 IsEmpty]: Start isEmpty. Operand 1997 states and 2702 transitions. [2023-11-19 05:19:40,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2023-11-19 05:19:40,659 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:40,663 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:40,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 05:19:40,665 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:40,665 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:40,666 INFO L85 PathProgramCache]: Analyzing trace with hash 217556437, now seen corresponding path program 1 times [2023-11-19 05:19:40,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:40,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066785426] [2023-11-19 05:19:40,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:40,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:40,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:41,123 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-11-19 05:19:41,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:41,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066785426] [2023-11-19 05:19:41,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066785426] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:41,124 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:41,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:19:41,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246100847] [2023-11-19 05:19:41,125 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:41,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:19:41,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:41,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:19:41,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:19:41,127 INFO L87 Difference]: Start difference. First operand 1997 states and 2702 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-11-19 05:19:41,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:41,876 INFO L93 Difference]: Finished difference Result 3982 states and 5388 transitions. [2023-11-19 05:19:41,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:19:41,877 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 97 [2023-11-19 05:19:41,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:41,932 INFO L225 Difference]: With dead ends: 3982 [2023-11-19 05:19:41,933 INFO L226 Difference]: Without dead ends: 1998 [2023-11-19 05:19:41,944 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 [2023-11-19 05:19:41,948 INFO L413 NwaCegarLoop]: 319 mSDtfsCounter, 0 mSDsluCounter, 319 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 638 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:41,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 638 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 05:19:41,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1998 states. [2023-11-19 05:19:42,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1998 to 1998. [2023-11-19 05:19:42,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1998 states, 1292 states have (on average 1.2577399380804954) internal successors, (1625), 1327 states have internal predecessors, (1625), 532 states have call successors, (532), 172 states have call predecessors, (532), 173 states have return successors, (546), 530 states have call predecessors, (546), 530 states have call successors, (546) [2023-11-19 05:19:42,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1998 states to 1998 states and 2703 transitions. [2023-11-19 05:19:42,152 INFO L78 Accepts]: Start accepts. Automaton has 1998 states and 2703 transitions. Word has length 97 [2023-11-19 05:19:42,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:42,153 INFO L495 AbstractCegarLoop]: Abstraction has 1998 states and 2703 transitions. [2023-11-19 05:19:42,153 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-11-19 05:19:42,154 INFO L276 IsEmpty]: Start isEmpty. Operand 1998 states and 2703 transitions. [2023-11-19 05:19:42,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-11-19 05:19:42,161 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:42,162 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:42,162 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 05:19:42,162 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:42,163 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:42,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1784393919, now seen corresponding path program 1 times [2023-11-19 05:19:42,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:42,164 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409727579] [2023-11-19 05:19:42,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:42,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:42,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:42,700 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-11-19 05:19:42,700 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:42,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409727579] [2023-11-19 05:19:42,701 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409727579] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:19:42,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425362458] [2023-11-19 05:19:42,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:42,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:42,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:42,707 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:19:42,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6491468-08e1-4955-a992-7541d8ca56f3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:19:43,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:43,325 INFO L262 TraceCheckSpWp]: Trace formula consists of 918 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:19:43,345 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:19:43,413 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-11-19 05:19:43,414 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:19:43,544 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-11-19 05:19:43,545 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425362458] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:19:43,545 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [886456549] [2023-11-19 05:19:43,571 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2023-11-19 05:19:43,571 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:19:43,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:19:43,583 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:19:43,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs