Well the crash is happening at the point where the perl interpreter has just finished executing the body of a require'd file (the require occurring as part of a 'use'). The interpreter is popping the CXt_EVAL context frame off the context stack (which was pushed on when the require'd file was about to be compiled). One step of popping the context is to decrement the recount of a temporary SV pointed to from within the context struct (which happens to hold the name of the file being compiled - or possibly the package name; can't remember which). The pointer stored in the context struct is obviously corrupt - it looks like part of the context struct has been overwritten with the text "nstance", as has been pointed out.

What the cause of this is, I don't know. Given that you're doing weird stuff with delaying execution, my initial instinct was that the context stack pointer has been decremented and then some other code has pushed a new context frame on, overwriting the eval context - all before the interpreter has actually returned from doing the require, However in this case, I would expect a new context frame (even of a different type than CXt_EVAL) to be mainly full of pointers and the like - not full of literal text. So it looks like a deeper problem with a rouge string pointer somewhere.

Dave.

In reply to Re: XS Error: Segfault with B::HooksAtRuntime by dave_the_m
in thread XS Error: Segfault with B::HooksAtRuntime by Ovid

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.