ZFS pool creation from files leads to a crash

[Steven Hartland]

On 16/11/2014 08:22, Andriy Gapon wrote:
> On 16/11/2014 09:29, K. Macy wrote:
>> #23 0xffffffff819b9a2c in zfs_vn_rdwr (rw=UIO_WRITE,
>> vp=0xfffff8005d94a3b0, base=0x0, len=104857600, offset=0,
>>      seg=UIO_SYSSPACE, ioflag=128, ulimit=0, cr=0xfffff80002cd9000,
>> residp=0xfffffe01219f6f18) at vnode.h:237
>> #24 0xffffffff819b9706 in vdev_file_io_start (zio=0xfffff80009ebb000)
>>      at /usr/home/kmacy/devel/freebsd-head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_file.c:188
>> #25 0xffffffff819fcea3 in zio_vdev_io_start (zio=0xfffff80009ebb000)
>>      at /usr/home/kmacy/devel/freebsd-head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:2709
>> #26 0xffffffff819f51f1 in zio_execute (zio=0xfffff80009ebb000)
>>      at /usr/home/kmacy/devel/freebsd-head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1409
>> #27 0xffffffff819f368a in zio_wait (zio=0xfffff80009ebb000)
>>      at /usr/home/kmacy/devel/freebsd-head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1433
>> #28 0xffffffff819bb51e in vdev_label_init (vd=0xfffff80009919800,
>> crtxg=4, reason=VDEV_LABEL_CREATE)
>>      at /usr/home/kmacy/devel/freebsd-head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_label.c:718
> Seems like this crash is caused by vdev_file_io_start being blissfully unaware
> of ZIO_TYPE_FREE.
>
It is indeed see the following bug for breakdown and patch:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195061

I'd love to know why I can run this many times over here and not a 
single sign of a panic :(

     Regards
     Steve