GNU bug report logs - #61960
30.0.50; Unexec build reliably crashes during loadup

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Package: emacs;

Reported by: Eli Zaretskii <eliz <at> gnu.org>

Date: Sat, 4 Mar 2023 14:56:02 UTC

Severity: normal

Found in version 30.0.50

Done: Stefan Kangas <stefankangas <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Konstantin Kharlamov <hi-angel <at> yandex.ru>
To: 61960 <at> debbugs.gnu.org
Subject: bug#61960: 30.0.50; Unexec build reliably crashes during loadup
Date: Sat, 04 Mar 2023 23:26:31 +0300

On Sat, 2023-03-04 at 23:05 +0300, Konstantin Kharlamov wrote:
> So, I kind of reproduced the problem… But it doesn't happen reliably.
> 
> I reconfigured the build with the exact flags, ran `make clean` and `make`,
> and
> it did fail with a `free(): invalid pointer`.
> 
> However, entering the `src/` dir and running `./temacs --batch -l loadup --
> temacs=bootstrap` doesn't reproduce crash, it finishes successfully.
> 
> Gotta figure out under what exactly conditions crash happens.

UPD: did find the command that crashes:

	./temacs --__aslr-disabled -batch -l loadup --temacs=dump

I think this command is run internally by `temacs`. I found it by running a bpftrace command alongside the build:

	 sudo bpftrace -e 'tracepoint:syscalls:sys_enter_exec*{ printf("pid: %d, comm: %s, args: ", pid, comm); join(args->argv); }'
This bug report was last modified 94 days ago.

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