Date: Tue, 13 Jun 2006 00:20:22 GMT From: Matthieu Michaud <ohmer@epita.info> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/97591: 6.1-RELEASE crashes on fork bomb Message-ID: <200606130020.k5D0KM9u065231@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
The following reply was made to PR kern/97591; it has been noted by GNATS.
From: Matthieu Michaud <ohmer@epita.info>
To: Maxim Konovalov <maxim@macomnet.ru>
Cc: bug-followup@freebsd.org
Subject: Re: kern/97591: 6.1-RELEASE crashes on fork bomb
Date: Tue, 13 Jun 2006 02:16:32 +0200
On Fri, 2006-06-09 at 21:40 +0400, Maxim Konovalov wrote:
> Hi Matthieu,
>
> > >Description:
> > my fresh installed 6.1-RELEASE workstation doesn't survive to a
> > simple fork bomb. after launching the bomb, it freezes a few seconds
> > and then my computer reboots. afair, 5.4 systems survived it.
> >
> > i didn't tweak my kernel, i just use home compiled GENERIC without
> > overriden CFLAGS. everything is almost default install. what about
> > adding a forkbomb in regression tests ?
>
> Please clarify what you mean by "home compiled GENERIC"? Do you
> change anything there? Have you changed anything in /boot/loader.conf
> or /etc/sysctl.conf?
i meant that i used the official GENERIC kernel configuration file but i
compiled it myself. the only kernel module i use is snd_ich (and sound
obviously). that's stick into my /boot/loader.conf and i didn't set any
value with /etc/sysctl.conf
> > >How-To-Repeat:
> > echo 'int main() { for(;;) fork(); }' | gcc -x c - && ./a.out
>
> While we definitly have some problems in pmap(9) code in 7.0 aka HEAD
> I can't reproduce the problem on RELENG_6 system.
i tried to reproduce it but couldn't. when i tried it, just
before filling a PR, it did exactly the same thing 3 times : run, fork
few seconds and suddenly reboot. i can't explain it.
> Please try to obtain a backtrace from the kernel core file or ddb.
>
> http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html
i activated it, i'll try to crash it again, have a core dump and send
useful information. for now, i don't see any reason to keep this PR
open as it seem to be a very rare case.
--
Matthieu Michaud
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200606130020.k5D0KM9u065231>