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`nim check` gives `SIGSEGV: Illegal storage access` ; maybe because of sizeof #9610

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timotheecour opened this issue Nov 3, 2018 · 3 comments

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commented Nov 3, 2018

nim check Nim/lib/system/gc.nim gives SIGSEGV: Illegal storage access

Traceback (most recent call last)
/Users/timothee/git_clone/nim/Nim/compiler/nim.nim(108) nim
/Users/timothee/git_clone/nim/Nim/compiler/nim.nim(72) handleCmdLine
/Users/timothee/git_clone/nim/Nim/compiler/cmdlinehelper.nim(91) loadConfigsAndRunMainCommand
/Users/timothee/git_clone/nim/Nim/compiler/main.nim(254) mainCommand
/Users/timothee/git_clone/nim/Nim/compiler/main.nim(58) commandCheck
/Users/timothee/git_clone/nim/Nim/compiler/modules.nim(126) compileProject
/Users/timothee/git_clone/nim/Nim/compiler/modules.nim(71) compileModule
/Users/timothee/git_clone/nim/Nim/compiler/passes.nim(200) processModule
/Users/timothee/git_clone/nim/Nim/compiler/passes.nim(86) processTopLevelStmt
/Users/timothee/git_clone/nim/Nim/compiler/sem.nim(605) myProcess
/Users/timothee/git_clone/nim/Nim/compiler/sem.nim(568) semStmtAndGenerateGenerics
/Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim(1967) semStmt
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(913) semExprNoType
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2549) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim(1758) semProc
/Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim(1686) semProcAux
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(1600) semProcBody
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2531) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim(1908) semStmtList
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2529) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(1553) semAsgn
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(59) semExprWithType
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2508) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(277) semCast
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(59) semExprWithType
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2439) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2052) semMagic
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(894) semDirectOp
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(744) semOverloadedCallAnalyseEffects
/Users/timothee/git_clone/nim/Nim/compiler/semcall.nim(498) semOverloadedCall
/Users/timothee/git_clone/nim/Nim/compiler/semcall.nim(307) resolveOverloads
/Users/timothee/git_clone/nim/Nim/compiler/semcall.nim(93) pickBestCandidate
/Users/timothee/git_clone/nim/Nim/compiler/sigmatch.nim(2427) matches
/Users/timothee/git_clone/nim/Nim/compiler/sigmatch.nim(2367) matchesAux
/Users/timothee/git_clone/nim/Nim/compiler/sigmatch.nim(2185) prepareOperand
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(41) semOperand
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2430) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(234) semConv
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(59) semExprWithType
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2439) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2052) semMagic
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(895) semDirectOp
/Users/timothee/.choosenim/toolchains/nim-0.19.0/lib/system.nim(414) afterCallActions
SIGSEGV: Illegal storage access. (Attempt to read from nil?)

among other things, this causes NimLime to crash (and forces one to restart sublimetext)

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commented Nov 3, 2018

likewise with Nim/lib/pure/ioselects/ioselectors_select.nim

* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x0000000100196a77 nim_temp afterCallActions_Qn3T9bt6Cg4I7XaYRMg219aw(c=0x0000000100b645b0, n=0x0000000107bbc828, orig=0x0000000107bc1048, flags=4480) + 839 at /Users/timothee/git_clone/nim/Nim/lib/system.nim:469
   466
   467  template `!=`*(x, y: untyped): untyped =
   468    ## unequals operator. This is a shorthand for ``not (x == y)``.
-> 469    not (x == y)
   470
   471  template `>=`*(x, y: untyped): untyped =
   472    ## "is greater or equals" operator. This is the same as ``y <= x``.
Target 0: (nim_temp) stopped.
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x0000000100196a77 nim_temp afterCallActions_Qn3T9bt6Cg4I7XaYRMg219aw(c=0x0000000100b645b0, n=0x0000000107bbc828, orig=0x0000000107bc1048, flags=4480) + 839 at /Users/timothee/git_clone/nim/Nim/lib/system.nim:469
    frame #1: 0x000000010018c473 nim_temp semDirectOp_vJZwz9bfROKrfrtM50y74CQ_5(c=0x0000000100b645b0, n=0x0000000107bc6e10, flags=4480) + 243 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:895
    frame #2: 0x00000001001db32f nim_temp semMagic_NYxU2DkHA0Gt5fsL9bYZdog_2(c=0x0000000100b645b0, n=0x0000000107bc6e10, s=0x0000000104bcd4c8, flags=4480) + 5823 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2055
    frame #3: 0x000000010013eb3f nim_temp semExpr_vJZwz9bfROKrfrtM50y74CQ_2(c=0x0000000100b645b0, n=0x0000000107bc6e10, flags=4480) + 5375 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2442
    frame #4: 0x000000010020eac7 nim_temp semOperand_vJZwz9bfROKrfrtM50y74CQ_35(c=0x0000000100b645b0, n=0x0000000107bc6e10, flags=384) + 119 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:41
    frame #5: 0x00000001002aa007 nim_temp prepareOperand_2XvpHGePOMU89c3szM9bT9bMg(c=0x0000000100b645b0, formal=0x0000000104bbbca8, a=0x0000000107bc6e10) + 375 at /Users/timothee/git_clone/nim/Nim/compiler/sigmatch.nim:2185
    frame #6: 0x00000001002af01c nim_temp matchesAux_jWX5qJnM9cS16h0kw9aDyhrg(c=0x0000000100b645b0, n=0x0000000107bc6da0, nOrig=0x0000000107ba9d68, m=0x00007ffeefbf7c10, marker=0x00007ffeefbf7998) + 19900 at /Users/timothee/git_clone/nim/Nim/compiler/sigmatch.nim:2367
    frame #7: 0x00000001002b4094 nim_temp matches_BxEsf1Gt7Hq3usrwPERzyA_2(c=0x0000000100b645b0, n=0x0000000107bc6da0, nOrig=0x0000000107ba9d68, m=0x00007ffeefbf7c10) + 372 at /Users/timothee/git_clone/nim/Nim/compiler/sigmatch.nim:2427
    frame #8: 0x000000010019fd88 nim_temp pickBestCandidate_IETBO4nA4t9bpyaJXqQ9aSTg(c=0x0000000100b645b0, headSymbol=0x0000000107bc6d68, n=0x0000000107bc6da0, orig=0x0000000107ba9d68, initialBinding=0x0000000000000000, filter=487424, best=0x00007ffeefbf84d8, alt=0x00007ffeefbf81c0, errors=0x00007ffeefbf8578, diagnosticsFlag='\0', errorsEnabled='\0') + 1528 at /Users/timothee/git_clone/nim/Nim/compiler/semcall.nim:93
    frame #9: 0x00000001001a1483 nim_temp resolveOverloads_deoiEhU508ju9btmg2AXeFw(c=0x0000000100b645b0, n=0x0000000107bc6da0, orig=0x0000000107ba9d68, filter=487424, flags=2048, errors=0x00007ffeefbf8578, errorsEnabled='\0', Result=0x00007ffeefbf84d8) + 1027 at /Users/timothee/git_clone/nim/Nim/compiler/semcall.nim:307
    frame #10: 0x000000010015a072 nim_temp semOverloadedCall_pBkKnME6t9c8v6khuDD76Fg(c=0x0000000100b645b0, n=0x0000000107bc6da0, nOrig=0x0000000107ba9d68, filter=487424, flags=2048) + 258 at /Users/timothee/git_clone/nim/Nim/compiler/semcall.nim:498
    frame #11: 0x0000000100196cfb nim_temp semOverloadedCallAnalyseEffects_9b1JieByYAFP9bIuFhYqD8AA(c=0x0000000100b645b0, n=0x0000000107bc6da0, nOrig=0x0000000107ba9d68, flags=2048) + 251 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:744
    frame #12: 0x000000010018c412 nim_temp semDirectOp_vJZwz9bfROKrfrtM50y74CQ_5(c=0x0000000100b645b0, n=0x0000000107bc6da0, flags=2048) + 146 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:894
    frame #13: 0x000000010013eb0c nim_temp semExpr_vJZwz9bfROKrfrtM50y74CQ_2(c=0x0000000100b645b0, n=0x0000000107bc6da0, flags=2048) + 5324 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2441
    frame #14: 0x0000000100141744 nim_temp semExprWithType_vJZwz9bfROKrfrtM50y74CQ(c=0x0000000100b645b0, n=0x0000000107bc6da0, flags=0) + 116 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:59
    frame #15: 0x00000001001e60fb nim_temp semCast_7YxUILpPxooC5qqa89a54dw_36(c=0x0000000100b645b0, n=0x0000000107bc6cf8) + 555 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:277
    frame #16: 0x000000010013fcd2 nim_temp semExpr_vJZwz9bfROKrfrtM50y74CQ_2(c=0x0000000100b645b0, n=0x0000000107bc6cf8, flags=3072) + 9874 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2511
    frame #17: 0x0000000100141744 nim_temp semExprWithType_vJZwz9bfROKrfrtM50y74CQ(c=0x0000000100b645b0, n=0x0000000107bc6cf8, flags=1024) + 116 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:59
    frame #18: 0x0000000100187ec3 nim_temp semAsgn_mkzYzG9avRzHz5NmIFyZdRg(c=0x0000000100b645b0, n=0x0000000107bc6cc0, mode='\0') + 4147 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:1559
    frame #19: 0x000000010013ff8b nim_temp semExpr_vJZwz9bfROKrfrtM50y74CQ_2(c=0x0000000100b645b0, n=0x0000000107bc6cc0, flags=0) + 10571 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2532
    frame #20: 0x00000001001e9905 nim_temp semStmtList_vJZwz9bfROKrfrtM50y74CQ_28(c=0x0000000100b645b0, n=0x0000000107bc64e0, flags=0) + 661 at /Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim:1914
    frame #21: 0x000000010013ffe3 nim_temp semExpr_vJZwz9bfROKrfrtM50y74CQ_2(c=0x0000000100b645b0, n=0x0000000107bc64e0, flags=0) + 10659 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2534
    frame #22: 0x000000010019ec15 nim_temp semProcBody_7YxUILpPxooC5qqa89a54dw_4(c=0x0000000100b645b0, n=0x0000000107bc64e0) + 149 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:1600
    frame #23: 0x000000010019ddaa nim_temp semProcAux_HtuGXsziiAueY6wARBVVAA(c=0x0000000100b645b0, n=0x0000000107bc6390, kind='\f', validPragmas="", phase='\0') + 13482 at /Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim:1692
    frame #24: 0x000000010020b3a7 nim_temp semProc_7YxUILpPxooC5qqa89a54dw_52(c=0x0000000100b645b0, n=0x0000000107bc6390) + 119 at /Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim:1764
    frame #25: 0x00000001001402e9 nim_temp semExpr_vJZwz9bfROKrfrtM50y74CQ_2(c=0x0000000100b645b0, n=0x0000000107bc6390, flags=0) + 11433 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2552
    frame #26: 0x00000001001e9905 nim_temp semStmtList_vJZwz9bfROKrfrtM50y74CQ_28(c=0x0000000100b645b0, n=0x0000000107bc6358, flags=0) + 661 at /Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim:1914
    frame #27: 0x000000010013ffe3 nim_temp semExpr_vJZwz9bfROKrfrtM50y74CQ_2(c=0x0000000100b645b0, n=0x0000000107bc6358, flags=0) + 10659 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2534
    frame #28: 0x00000001001a9434 nim_temp semWhen_5C4HPXQuhxlMYIzPbe36lg(c=0x0000000100b645b0, n=0x0000000107bc87f0, semCheck='\x01') + 4532 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2104
    frame #29: 0x000000010013f0d1 nim_temp semExpr_vJZwz9bfROKrfrtM50y74CQ_2(c=0x0000000100b645b0, n=0x0000000107bc87f0, flags=64) + 6801 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2458
    frame #30: 0x00000001001e9905 nim_temp semStmtList_vJZwz9bfROKrfrtM50y74CQ_28(c=0x0000000100b645b0, n=0x0000000107bcf8d0, flags=64) + 661 at /Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim:1914
    frame #31: 0x000000010013ffe3 nim_temp semExpr_vJZwz9bfROKrfrtM50y74CQ_2(c=0x0000000100b645b0, n=0x0000000107bcf8d0, flags=64) + 10659 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:2534
    frame #32: 0x000000010013d5c8 nim_temp semExprNoType_7YxUILpPxooC5qqa89a54dw_2(c=0x0000000100b645b0, n=0x0000000107bcf8d0) + 248 at /Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim:913
    frame #33: 0x0000000100141455 nim_temp semStmt_vJZwz9bfROKrfrtM50y74CQ_3(c=0x0000000100b645b0, n=0x0000000107bcf8d0, flags=0) + 165 at /Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim:1973
    frame #34: 0x0000000100211d82 nim_temp semStmtAndGenerateGenerics_7YxUILpPxooC5qqa89a54dw_62(c=0x0000000100b645b0, n=0x0000000107bcf8d0) + 850 at /Users/timothee/git_clone/nim/Nim/compiler/sem.nim:568
    frame #35: 0x0000000100212261 nim_temp myProcess_QAJdPOwMq9buTNGNGQO3ImA(context=0x0000000100b645b0, n=0x0000000107bcf8d0) + 417 at /Users/timothee/git_clone/nim/Nim/compiler/sem.nim:605
    frame #36: 0x0000000100270e04 nim_temp processTopLevelStmt_ZAiAbwXmDdFhEBV9b9avo9bNQ(graph=0x0000000100b5d6d8, n=0x0000000107bcf8d0, a=0x00007ffeefbfbc00) + 660 at /Users/timothee/git_clone/nim/Nim/compiler/passes.nim:86
    frame #37: 0x0000000100272c59 nim_temp processModule_zPTa50e0M05UK8aJ9bS48aw(graph=0x0000000100b5d6d8, module=0x0000000105504288, stream=0x0000000000000000) + 5849 at /Users/timothee/git_clone/nim/Nim/compiler/passes.nim:194
    frame #38: 0x0000000100551918 nim_temp compileModule_G7A63DimkOmtueyLoB89c8w(graph=0x0000000100b5d6d8, fileIdx=11, flags=4096) + 520 at /Users/timothee/git_clone/nim/Nim/compiler/modules.nim:76
    frame #39: 0x0000000100552393 nim_temp compileProject_KlDcF6rnOBDQLo439cvjPjg(graph=0x0000000100b5d6d8, projectFileIdx=-1) + 563 at /Users/timothee/git_clone/nim/Nim/compiler/modules.nim:126
    frame #40: 0x00000001000e293f nim_temp commandCheck_ikP0vuP6oxqlYdG7q9cY7sA_5(graph=0x0000000100b5d6d8) + 223 at /Users/timothee/git_clone/nim/Nim/compiler/main.nim:58
    frame #41: 0x00000001000e542a nim_temp mainCommand_ikP0vuP6oxqlYdG7q9cY7sA(graph=0x0000000100b5d6d8) + 8314 at /Users/timothee/git_clone/nim/Nim/compiler/main.nim:254
    frame #42: 0x000000010055aaac nim_temp loadConfigsAndRunMainCommand_Zakie0oLAV2ve6DuAr547w(self=0x0000000100b2bd68, cache=0x0000000100b16030, conf=0x0000000100b0f048) + 3404 at /Users/timothee/git_clone/nim/Nim/compiler/cmdlinehelper.nim:91
    frame #43: 0x00000001000219e7 nim_temp handleCmdLine_I9aitIr13Z1B6wHv5vzMf2w(cache=0x0000000100b16030, conf=0x0000000100b0f048) + 535 at /Users/timothee/git_clone/nim/Nim/compiler/nim.nim:72
    frame #44: 0x0000000100022960 nim_temp NimMainModule + 192 at /Users/timothee/git_clone/nim/Nim/compiler/nim.nim:108
    frame #45: 0x0000000100022899 nim_temp NimMainInner + 9 at /Users/timothee/git_clone/nim/Nim/lib/system.nim:3388
    frame #46: 0x00000001000229da nim_temp NimMain + 42 at /Users/timothee/git_clone/nim/Nim/lib/system.nim:3396
    frame #47: 0x0000000100022a27 nim_temp main(argc=3, args=0x00007ffeefbfc540, env=0x00007ffeefbfc560) + 71 at /Users/timothee/git_clone/nim/Nim/lib/system.nim:3403
    frame #48: 0x00007fff6115b085 libdyld.dylib start + 1
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commented Nov 3, 2018

/cc @krux02 it looks related to sizeof:
nim check shows Error: cannot evaluate 'sizeof' because its type is not defined completely right before SIGSEGV: Illegal storage access

minimized to remove all dependencies:

const platformHeaders = """#include <sys/select.h>
                             #include <sys/time.h>
                             #include <sys/types.h>
                             #include <unistd.h>"""
type
  Fdset {.importc: "fd_set", header: platformHeaders, pure, final.} = object

when hasThreadSupport:
  type
    SelectorImpl[T] = object
else:
  type
    SelectorImpl[T] = object

type
  SelectEventImpl = object
    rsock: distinct int

proc newSelectEvent*() =
  let temp0=sizeof(SelectEventImpl)
Traceback (most recent call last)
/Users/timothee/git_clone/nim/Nim/compiler/nim.nim(108) nim
/Users/timothee/git_clone/nim/Nim/compiler/nim.nim(72) handleCmdLine
/Users/timothee/git_clone/nim/Nim/compiler/cmdlinehelper.nim(91) loadConfigsAndRunMainCommand
/Users/timothee/git_clone/nim/Nim/compiler/main.nim(254) mainCommand
/Users/timothee/git_clone/nim/Nim/compiler/main.nim(58) commandCheck
/Users/timothee/git_clone/nim/Nim/compiler/modules.nim(126) compileProject
/Users/timothee/git_clone/nim/Nim/compiler/modules.nim(71) compileModule
/Users/timothee/git_clone/nim/Nim/compiler/passes.nim(197) processModule
/Users/timothee/git_clone/nim/Nim/compiler/passes.nim(86) processTopLevelStmt
/Users/timothee/git_clone/nim/Nim/compiler/sem.nim(605) myProcess
/Users/timothee/git_clone/nim/Nim/compiler/sem.nim(568) semStmtAndGenerateGenerics
/Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim(1977) semStmt
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(913) semExprNoType
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2552) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim(1764) semProc
/Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim(1692) semProcAux
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(1600) semProcBody
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2534) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim(1914) semStmtList
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2537) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semstmts.nim(438) semVarOrLet
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(59) semExprWithType
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2442) semExpr
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(2055) semMagic
/Users/timothee/git_clone/nim/Nim/compiler/semexprs.nim(895) semDirectOp
/Users/timothee/git_clone/nim/Nim/lib/system.nim(469) afterCallActions
SIGSEGV: Illegal storage access. (Attempt to read from nil?)

[EDIT] indeed, seems like a regression, 0.19.0 didn't give SIGSEGV

@timotheecour timotheecour changed the title `nim check Nim/lib/system/gc.nim` gives `SIGSEGV: Illegal storage access` `nim check` gives `SIGSEGV: Illegal storage access` ; maybe because of sizeof Nov 3, 2018

@Araq Araq closed this in a2e6a87 Nov 3, 2018

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commented Nov 3, 2018

@Araq thanks!

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