Re: Emacs crashes accidentally

[Andreas Schwab]

"Herbert Euler" <address@hidden> writes:

> PRINT_STRING calls STROUT in this way:
>
> (print.c, version 1.190.2.21, line 505-508)
>
>     /* strout is safe for output to a frame (echo area) or to
> print_buffer. */
>     strout (SDATA (string),
>             chars, SBYTES (string),
>             printcharfun, STRING_MULTIBYTE (string));
>
> "SDATA (string)" shall be 0x243d8ac (see also result of P *$ in gdb),
> but value of the first argument (PTR) of STROUT is 0x2469648.
> This is the reason why Emacs crashed.
>
> But, why did this happen?  Memory leak?

Looks like a GC violation.  See the comment for message_nolog:

   This may GC (insert may run before/after change hooks),
   so the buffer M must NOT point to a Lisp string.  */

Can you find out whether GC was called during the call to message_nolog
in strout?

Andreas.

-- 
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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