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Date:      Fri, 30 Jul 2004 14:02:21 +0200
From:      Eric Masson <e-masson@kisoft-services.com>
To:        Mailing List FreeBSD Current <freebsd-current@FreeBSD.org>
Subject:   Re: ffs snapshots & large disks
Message-ID:  <86n01hu2ia.fsf@srvbsdnanssv.interne.kisoft-services.com>
In-Reply-To: <864qnpvn0y.fsf@srvbsdnanssv.interne.kisoft-services.com> (Eric Masson's message of "Fri, 30 Jul 2004 11:53:49 %2B0200")
References:  <864qnpvn0y.fsf@srvbsdnanssv.interne.kisoft-services.com>

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>>>>> "Eric" == Eric Masson <e-masson@kisoft-services.com> writes:

Followup to myself.

 Eric> Is there any way to speed up snapshot creation ?

Well, I removed the src directory from vol0 and shut down the machine
via shutdown -p now and everything went fine except i got a lor (similar
to id 006 in page http://sources.zabbadoz.net/freebsd/lor.html) at next
reboot :
Mounting root from ufs:/dev/amrd0s1a
lock order reversal
 1st 0xc26bf948 vnode interlock (vnode interlock) @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:1906
 2nd 0xc103a100 system map (system map) @ /usr/src/sys/vm/vm_map.c:2223
KDB: stack backtrace:
kdb_backtrace(0,ffffffff,c08b9568,c08ba7b0,c0848a5c) at kdb_backtrace+0x29
witness_checkorder(c103a100,9,c0804b23,8af) at witness_checkorder+0x544
_mtx_lock_flags(c103a100,0,c0804b23,8af) at _mtx_lock_flags+0x5b
_vm_map_lock(c103a0a0,c0804b23,8af) at _vm_map_lock+0x21
vm_map_remove(c103a0a0,c26e1000,c26e9000,dd04dba0,c074cdc1) at vm_map_remove+0x1f
kmem_free(c103a0a0,c26e1000,8000,dd04dbb8,c074eb17) at kmem_free+0x25
page_free(c26e1000,8000,22,8000,dd04dbd0) at page_free+0x29
uma_large_free(c26b33c0) at uma_large_free+0x7f
free(c26e1000,c0881ae0,c2667600,0,c265c000) at free+0xe1
ffs_snapshot_unmount(c265c000) at ffs_snapshot_unmount+0xe7
ffs_flushfiles(c265c000,0,c23c2000) at ffs_flushfiles+0x40
softdep_flushfiles(c265c000,0,c23c2000,c26bf738,0) at softdep_flushfiles+0x1e
ffs_unmount(c265c000,8000000,c23c2000,0,0) at ffs_unmount+0x32
dounmount(c265c000,8000000,c23c2000,410a0a31,8c4052) at dounmount+0x1c4
unmount(c23c2000,dd04dd14,2,1,206) at unmount+0x1e0
syscall(2f,2f,2f,804a72f,8052a51) at syscall+0x217
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (22, FreeBSD ELF32, unmount), eip = 0x280c32b7, esp = 0xbfbfe51c, ebp = 0xbfbfe5c8 ---

I then rm'ed the snapshot named snap0 in /vol0/.snap and later shut down
the box via shutdown -p now. syncer process timed out, last message
before stop was "giving up on 41 buffers."

Since last startup, the box is fscking all filesystems (none were marked
clean)

Is this an expected behaviour atm ?

I can offer shell access to the box if needed.

Regards

Eric Masson

-- 
 FG> Quelle rapport entre vendre/acheter des livres et
 FG> etre bibliophile?
 On n'a pas toujours l'opportunité de les voler.
 -+- FF in <http://www.le-gnu.net>; - À l'insu de son plein gré -+-



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