Date: Tue, 03 Feb 2009 22:00:13 +0200 From: Mikolaj Golub <to.my.trociny@gmail.com> To: Sergey S <ad.sergey@gmail.com> Cc: remko@freebsd.org, Mikolaj Golub <to.my.trociny@gmail.com>, freebsd-bugs@freebsd.org Subject: Re: misc/131290: How to completely freeze FreeBSD 7.1 under a non-privileged user Message-ID: <86iqnrb8aa.fsf@kopusha.onet> In-Reply-To: <ab09a9970902030419j92add19y837afc7aa871aabb@mail.gmail.com> (Sergey S.'s message of "Tue\, 3 Feb 2009 04\:19\:33 -0800") References: <200902021314.n12DEwd3098744@freefall.freebsd.org> <ab09a9970902021213h6e58a1b4o56bcfabb2e5da3e6@mail.gmail.com> <817i47oibn.fsf@zhuzha.ua1> <ab09a9970902030419j92add19y837afc7aa871aabb@mail.gmail.com>
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On Tue, 3 Feb 2009 04:19:33 -0800 Sergey S wrote: >> I have tried your scripts and have not managed to reproduce the hang, even >> running the loop script without sleep. SS> It's very strange, because the bug is 100% reprodusable to me (on two SS> separate computers) :( Sorry, I missed previously that your system was amd64. I tried on i386 FreeBSD 7.1-STABLE. Currently, I don't have amd64 where I can install erlang and do such tests. >> http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html SS> Thanks for your suggestion. I hope it will help. >> But I would recommend you to start from simpler techniques, e.g. running in >> parallel top and other system utilities and writing the output to the file for >> further investigation. Something like this: >> >> top -b -s1 -S -d1000 1000 > top.output & >> ./gistfile1.sh SS> I've done it. gzipped top.output is attached to this letter. So, according to top output (I don't see the script process here) it hanged the system in less then one second? I have observed freezes when top with -S option froze while without -S option worked. You can try removing -S option. But I am afraid this won't help and you will have to make the system core dump (as described at URL above) and do post-mortem analysis of the dump. -- Mikolaj Golub
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