Reproducible ZFS panic, w/ script (Was: "New" ZFS crash on FS (pool?) unmount/export)

[Thomas Backman]

On Jul 10, 2009, at 21:27, Kip Macy wrote:

> "zfs export" does a forced unmount. We may not be properly handling
> dangling references.
>
> -Kip
>
> On Fri, Jul 10, 2009 at 12:25 PM, Thomas  
> Backman<serenity at exscape.org> wrote:
>> On Jul 10, 2009, at 21:01, Thomas Backman wrote:
>> ...

Just one more thing to add for me today: the crash always happens when  
exporting the slave. Constant send/recv loops multiple times a second,  
no sweat.  import/export of both pools multiple times a second,  
without any send/recv in between them, no sweat. Combined, however, it  
panics on "zpool export crashtestslave". (I verified this twice, once  
by changing stress() to simply run loads of incremental backups for a  
for a few minutes, break, and export the pools manually. Both times,  
the master pool was no problem, and it immediately panics on exporting  
the slave.)

Regards,
Thomas