Date: Wed, 29 Jul 2009 19:02:20 +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: <4A70728C.7020004@freebsd.org> In-Reply-To: <4A705E50.8070307@icyb.net.ua> 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>
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on 29/07/2009 17:36 Andriy Gapon said the following:
> on 29/07/2009 17:10 Thomas Backman said the following:
> [snip]
>> (kgdb) fr 11
> [snip]
>> (kgdb) p *sx
>> $8 = {lock_object = {lo_name = 0xffffffff80b5634c "zp->z_lock", lo_flags
>> = 40894464 [0x2700000, btw], lo_data = 0, lo_witness = 0x0},
>> sx_lock = 6}
>>
>> ... as you might notice, I'm mostly clueless as to what I'm doing here. :o
>> Hope that helps (a bit), though.
>
> Yes, it does and a lot.
> sx_lock = 6 means that this sx lock is destroyed:
> #define SX_LOCK_DESTROYED \
> (SX_LOCK_SHARED_WAITERS | SX_LOCK_EXCLUSIVE_WAITERS)
>
> And lo_name tells that this is zp->z_lock.
> This lock is destroyed in zfs_znode_cache_destructor.
> Not enough knowledge for me to proceed further.
So I guess that this is a case when zfs_znode_delete() was called on znode that
was still referenced from some vnode. When the vnode gets reclaimed we get this
problem.
Could you please examine vp in frame 15 or 16?
--
Andriy Gapon
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