Crash with ZFS between r296491 and r296548

[Ed Maste]

On 8 March 2016 at 18:52, Jean-Sébastien Pédron
<jean-sebastien.pedron at dumbbell.fr> wrote:
> Hi!
>
> I use Root on ZFS and my laptop doesn't boot with a kernel from r296548
> and world from r296491 (so older than kernel). Ed hits a similar crash.
>
> Here are the dmesg and backtrace of zfs(8):
> https://gist.github.com/dumbbell/c9978ad4ac70214f0f47
>
> With a kernel and world from r296491, everything is ok.
>
> I didn't have the time to bisect the bad commit yet, so this is mostly a
> warning for other. Maybe someone will know what's wrong :)

The error's coming from namespace_reload() in libzfs_util.c,
ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_CONFIGS, &zc)

I haven't had a chance to bisect yet either. There are 9 or so commits
between r296491 and r296548 -- I hope mav@ has some insight.