Date: Thu, 30 Jul 2009 15:11:47 +0300 From: Andriy Gapon <avg@freebsd.org> To: Thomas Backman <serenity@exscape.org> Cc: freebsd-fs@freebsd.org, FreeBSD current <freebsd-current@freebsd.org>, Pawel Jakub Dawidek <pjd@freebsd.org> Subject: Re: zfs: Fatal trap 12: page fault while in kernel mode Message-ID: <4A718E03.6030909@freebsd.org> In-Reply-To: <86983A55-E5C4-4C04-A4C7-0AE9A9EE37A3@exscape.org> References: <20090727072503.GA52309@jpru.ffm.jpru.de> <4A6E06E6.9030300@mail.zedat.fu-berlin.de> <4A6EC9E2.5070200@icyb.net.ua> <20090729084723.GD1586@garage.freebsd.pl> <F4F82B3E-C119-40EF-9AA4-937052876D1E@exscape.org> <4A7030B6.8010205@icyb.net.ua> <97D5950F-4E4D-4446-AC22-92679135868D@exscape.org> <4A7048A9.4020507@icyb.net.ua> <52AA86CB-6C06-4370-BA73-CE19175467D0@exscape.org> <4A705299.8060504@icyb.net.ua> <D3491B77-DA5C-4E10-BE1D-D6EF8CFB112E@exscape.org> <4A7054E1.5060402@icyb.net.ua> <5918824D-A67C-43E6-8685-7B72A52B9CAE@exscape.org> <4A705E50.8070307@icyb.net.ua> <4A70728C.7020004@freebsd.org> <6D47A34B-0753-4CED-BF3D-C505B37748FC@exscape.org> <4A708455.5070304@freebsd.org> <86983A55-E5C4-4C04-A4C7-0AE9A9EE37A3@exscape.org>
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on 29/07/2009 21:04 Thomas Backman said the following: > Thanks for your work :) > However, bad news: it didn't help. It *might* have gotten us further, > though, because the DDB backtrace now looks like this: > > _sx_xlock_hard() > _sx_xlock() > zfs_znode_free() > zfs_freebsd_inactive() > VOP_INACTIVE_APV() > vinactive() > vput() > dounmount() > unmount() > syscall() > XFast_syscall() > Oh my bad. I missed the fact that recycle would do zfs_znode_free, so it seems like zfs_znode_free was called twice on the same znode. Could you please try replacing zfs_znode_free(zp); with vrecycle(vp, curthread); in the same block (instead of adding the latter before the former). Sorry, if this looks like shooting in the dark - because this is what it is. I am not familiar with the code and it's hard to follow all possibilities without good understanding. -- Andriy Gapon
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