From owner-freebsd-bugs@FreeBSD.ORG Fri Feb 6 10:28:16 2009 Return-Path: Delivered-To: freebsd-bugs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id CC58C106566B; Fri, 6 Feb 2009 10:28:16 +0000 (UTC) (envelope-from to.my.trociny@gmail.com) Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.156]) by mx1.freebsd.org (Postfix) with ESMTP id 26E478FC0A; Fri, 6 Feb 2009 10:28:15 +0000 (UTC) (envelope-from to.my.trociny@gmail.com) Received: by fg-out-1718.google.com with SMTP id l26so389407fgb.35 for ; Fri, 06 Feb 2009 02:28:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:to:cc:subject:references :organization:from:date:in-reply-to:message-id:user-agent :mime-version:content-type; bh=Aq3vsIV+qL5UMvRqBxIyJPhCBZFzWh84wScvpQ/WzNM=; b=glXmF7KvTrLjQ+WU4pK2+mTfsgikvlV3u8NLNKpAZ2rBN38Q010UECTnI9MPTxfQHH NhK017ogNDOvOBxQLGD4y6vg/KkG2PnmxLLkYtWYpF4UzBQnvBE1Kc7/neBPLZmQt7Hg aG3rZv7cxpbyTBusnW59OOOJJZmV/e9RA0zc4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=to:cc:subject:references:organization:from:date:in-reply-to :message-id:user-agent:mime-version:content-type; b=Jm5JWJsk/sfSRd4gwRBV0eP0/Koso+Y7YCfpT3BXqUSC7nMe2qXyOof6AqJnfRTT+C 1it1B5/wyBZRZ57yhv9Z4+SfI1OCKCRrgtOvZPeyttZ/ZnB11LKciGjoR6iGItlIaRWo Q+fs38ts7Y/H3y+Ios3ht45sH4u/EmYcAA3uo= Received: by 10.86.84.5 with SMTP id h5mr258324fgb.64.1233916095243; Fri, 06 Feb 2009 02:28:15 -0800 (PST) Received: from localhost (ms.singlescrowd.net [80.85.90.67]) by mx.google.com with ESMTPS id l19sm3918366fgb.57.2009.02.06.02.28.13 (version=TLSv1/SSLv3 cipher=RC4-MD5); Fri, 06 Feb 2009 02:28:14 -0800 (PST) To: Mikolaj Golub References: <200902021314.n12DEwd3098744@freefall.freebsd.org> <817i47oibn.fsf@zhuzha.ua1> <86iqnrb8aa.fsf@kopusha.onet> <81tz78nc5k.fsf@zhuzha.ua1> <8663jo663f.fsf@kopusha.onet> Organization: TOA Ukraine From: Mikolaj Golub Date: Fri, 06 Feb 2009 12:28:09 +0200 In-Reply-To: <8663jo663f.fsf@kopusha.onet> (Mikolaj Golub's message of "Thu\, 05 Feb 2009 21\:23\:16 +0200") Message-ID: <81myczuafa.fsf@zhuzha.ua1> User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Sergey S , remko@freebsd.org, freebsd-bugs@freebsd.org Subject: Re: misc/131290: How to completely freeze FreeBSD 7.1 under a non-privileged user X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Feb 2009 10:28:17 -0000 On Thu, 05 Feb 2009 21:23:16 +0200 Mikolaj Golub wrote: > On Thu, 5 Feb 2009 07:51:31 -0800 Sergey S wrote: > > SS> Hello. > > >> I can't hang the system running many cycles of loop.sh... > > SS> :( > > SS> I've no idea, what can be done in order to elucidate the problem... > > When I went home I left the machine with loop.sh run and now it is not > pingable, so it looks like it hangs :-) Tomorrow, I will know this for sure. > > I noticed from your top output that your system was idle when you did your > test while mine was rather loaded. That is why, I suppose, it required more > time for me to hang it. Yes, it hanged. I added to the GENERIC kernel config the followin options: options INVARIANTS options INVARIANT_SUPPORT options WITNESS options DEBUG_LOCKS options DEBUG_VFS_LOCKS options DIAGNOSTIC options KDB options DDB and run script on idle system. The system froze on the second cycle run. It did not panic and I was not able to enter the debugger, so no crush dump is available. Then I changed the scheduler to 4BSD. It hangs with 4BSD too but it looks like it requires more cycles. When it froze first time with 4BSD I managed to enter debugger pressing Ctr-ALt-ESC. But I made silly thing, I decided to check if the system would resume to normal state if I just return from the debugger. It did not and I was not able to enter ddb again. After this I hanged the system several times to try to enter ddb but without success :-( -- Mikolaj Golub