From: Paul Eggert <eggert@cs.ucla.edu>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 42931-done@debbugs.gnu.org, larsi@gnus.org, bruno@clisp.org,
p.stephani2@gmail.com, psainty@rcon.net.nz
Subject: bug#42931: 27.1; json-pretty-print-buffer on ~2MB line causes core dump
Date: Tue, 25 Aug 2020 11:19:04 -0700 [thread overview]
Message-ID: <6e7b8005-3865-50d1-be6a-5673fc6dc5c9@cs.ucla.edu> (raw)
In-Reply-To: <83k0xn5k45.fsf@gnu.org>
On 8/24/20 11:12 PM, Eli Zaretskii wrote:
> What about "normal" Emacs builds? They usually have between 2MB and
> 8MB of stack. Should we worry about stack overflow in these cases?
No. On x86-64 Ubuntu 18.04.5 each recursion level consumes 304 bytes. Dividing 2
MB by 304 gives you 6578 stack frames, which means the algorithm could handle a
vector of 2**6578 entries, which can't exist anywhere in the known physical
universe.
On real machines it'd have to be reeeeally tiny stack for this recursion to be a
significant problem now, so tiny that Emacs would crash for countless other
reasons. I'll take the liberty of closing the bug report.
prev parent reply other threads:[~2020-08-25 18:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-19 13:50 bug#42931: 27.1; json-pretty-print-buffer on ~2MB line causes core dump Phil Sainty
2020-08-19 14:15 ` Lars Ingebrigtsen
2020-08-19 15:18 ` Eli Zaretskii
2020-08-20 13:22 ` Lars Ingebrigtsen
2020-08-20 13:26 ` Philipp Stephani
2020-08-20 13:39 ` Eli Zaretskii
2020-08-24 23:46 ` Paul Eggert
2020-08-25 6:12 ` Eli Zaretskii
2020-08-25 18:19 ` Paul Eggert [this message]
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