Gentoo Archives: gentoo-user

From: "Joshua M. Murphy" <poisonbl@×××××.com>
To: gentoo-user <gentoo-user@l.g.o>
Subject: Re: [gentoo-user] segfault from C stack overflow
Date: Fri, 05 Feb 2021 13:53:25
Message-Id: CAOTuDKoxxvB+z4Kg27CVACGbOx2buYyC3-YnuwRZwTAtrPGSZg@mail.gmail.com
In Reply to: [gentoo-user] segfault from C stack overflow by karl@aspodata.se
1 On Fri, Feb 5, 2021 at 8:44 AM <karl@××××××××.se> wrote:
2 >
3 > When emerging R, I got:
4 >
5 > ...
6 > ** R
7 > ** data
8 > *** moving datasets to lazyload DB
9 > ** demo
10 > ** inst
11 > ** byte-compile and prepare package for lazy loading
12 > Error: segfault from C stack overflow
13 > ...
14 >
15 > Since linux automatically grows the stack, doesn't this mean
16 > that I'm out of memory.
17 >
18 > Btw.
19 > # prlimit -s
20 > RESOURCE DESCRIPTION SOFT HARD UNITS
21 > STACK max stack size 8388608 unlimited bytes
22 >
23 > and prlimit --stack=-1:-1 doesn't change the soft limit.
24 >
25 > Regards,
26 > /Karl Hammar
27
28 No, a stack overflow isn't a failure to allocate more space on the
29 stack, it's writing more data to a variable on the stack than what had
30 been allocated for it. For example, if you declare an array for 10
31 characters, then write 30 characters to it, it's a stack overflow
32 (because the variable's on the stack, and you overflowed the
33 boundaries of it).
34
35 --
36 Poison [BLX]
37 Joshua M. Murphy