[gentoo-user] segfault from C stack overflow

[gentoo-user] segfault from C stack overflow

[karl]

When emerging R, I got:

...
** R
** data
*** moving datasets to lazyload DB
** demo
** inst
** byte-compile and prepare package for lazy loading
Error: segfault from C stack overflow
...

Since linux automatically grows the stack, doesn't this mean
that I'm out of memory.

Btw. 
# prlimit -s
RESOURCE DESCRIPTION       SOFT      HARD UNITS
STACK    max stack size 8388608 unlimited bytes

and prlimit --stack=-1:-1 doesn't change the soft limit.

Regards,
/Karl Hammar

Re: [gentoo-user] segfault from C stack overflow

[Joshua M. Murphy]

On Fri, Feb 5, 2021 at 8:44 AM <karl@aspodata.se> wrote:
>
> When emerging R, I got:
>
> ...
> ** R
> ** data
> *** moving datasets to lazyload DB
> ** demo
> ** inst
> ** byte-compile and prepare package for lazy loading
> Error: segfault from C stack overflow
> ...
>
> Since linux automatically grows the stack, doesn't this mean
> that I'm out of memory.
>
> Btw.
> # prlimit -s
> RESOURCE DESCRIPTION       SOFT      HARD UNITS
> STACK    max stack size 8388608 unlimited bytes
>
> and prlimit --stack=-1:-1 doesn't change the soft limit.
>
> Regards,
> /Karl Hammar

No, a stack overflow isn't a failure to allocate more space on the
stack, it's writing more data to a variable on the stack than what had
been allocated for it. For example, if you declare an array for 10
characters, then write 30 characters to it, it's a stack overflow
(because the variable's on the stack, and you overflowed the
boundaries of it).

-- 
Poison [BLX]
Joshua M. Murphy