ZFS + xattr -> panic loop

[javocado]

Apologies:

FreeBSD hostname 8.3-RELEASE FreeBSD 8.3-RELEASE #1: Wed Sep 18 16:59:03
MDT 2013    amd64

On Thu, Nov 13, 2014 at 12:20 PM, Steven Hartland <killing at multiplay.co.uk>
wrote:

> Alwas good to include which version of the OS your talking about (uname -a)
>
>
> On 13/11/2014 19:43, javocado wrote:
>
>> After running an rsync (upload) into my zfs filesystem using the
>> --fake-super option (which stores permissions in extended attributes) the
>> zfs filesystem has somehow become corrupt. When booting the system it
>> panic's upon zfs startup:
>>
>> panic: solaris assert: VFS_ROOT(vfsp, LK_EXCLUSIVE, &vp) == 0, file:
>> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/
>> common/fs/zfs/zfs_vfsops.c
>> , line: 1170
>> cpuid = 12
>> KDB: stack backtrace:
>> #0 0xffffffff8034b3ae at kdb_backtrace+0x5e
>> #1 0xffffffff803185c7 at panic+0x187
>> #2 0xffffffff80ab8213 at zfs_mount+0x563
>> #3 0xffffffff803a2635 at vfs_donmount+0xdc5
>> #4 0xffffffff803a3133 at nmount+0x63
>> #5 0xffffffff80553284 at amd64_syscall+0x1f4
>> #6 0xffffffff8053bc2c at Xfast_syscall+0xfc
>>
>> I was able to boot the system by setting the filesystem:
>>
>> canmount=off
>>
>> However, I am still unable to mount it manually without causing a similar
>> panic.
>>
>> So, setting the cause of the panic aside for the moment, I just want to
>> get
>> to the data. I'd like to think I can do that by turning off xattrs and
>> mounting it read-only however:
>>
>> # zfs set xattr=off pool/data
>> property 'xattr' not supported on FreeBSD: permission denied
>>
>> How can I turn that off?
>>
>> Second or alternately, if I want to just dump the filesystem out excluding
>> the extended attributes, so that I have a clean, mountable data set, how
>> would I do that?
>>
>> Thank you!
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>
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