On Tue, Feb 20, 2018 at 10:46:25PM +0800, Anand Jain wrote:
> The replace target device can be missing in which case we don't
> allocate a missing btrfs_device when mounted with the -o degraded.
> So check the device before access.
> 
> BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0

Please don't use uncommon acronyms, NPD is quite confusing, null pointer
deref should be fine.

> IP: btrfs_destroy_dev_replace_tgtdev+0x43/0xf0 [btrfs]
> Call Trace:
> btrfs_dev_replace_cancel+0x15f/0x180 [btrfs]
> btrfs_ioctl+0x2216/0x2590 [btrfs]
> do_vfs_ioctl+0x625/0x650
> SyS_ioctl+0x4e/0x80
> do_syscall_64+0x5d/0x160
> entry_SYSCALL64_slow_path+0x25/0x25

Do you have a reproducer for that?
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