Date: Fri, 06 Feb 2009 12:28:09 +0200 From: Mikolaj Golub <to.my.trociny@gmail.com> To: Mikolaj Golub <to.my.trociny@gmail.com> Cc: Sergey S <ad.sergey@gmail.com>, remko@freebsd.org, freebsd-bugs@freebsd.org Subject: Re: misc/131290: How to completely freeze FreeBSD 7.1 under a non-privileged user Message-ID: <81myczuafa.fsf@zhuzha.ua1> In-Reply-To: <8663jo663f.fsf@kopusha.onet> (Mikolaj Golub's message of "Thu\, 05 Feb 2009 21\:23\:16 %2B0200") References: <200902021314.n12DEwd3098744@freefall.freebsd.org> <ab09a9970902021213h6e58a1b4o56bcfabb2e5da3e6@mail.gmail.com> <817i47oibn.fsf@zhuzha.ua1> <ab09a9970902030419j92add19y837afc7aa871aabb@mail.gmail.com> <86iqnrb8aa.fsf@kopusha.onet> <ab09a9970902050255x328b63fcob52921f8ef98ea4@mail.gmail.com> <81tz78nc5k.fsf@zhuzha.ua1> <ab09a9970902050751v5c626a91u1ab45fb861c796ba@mail.gmail.com> <8663jo663f.fsf@kopusha.onet>
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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
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