Re: Bisected, with rfc/patch - was Re: BUG: unable to handle kernel NULL pointer dereference at sysfs_do_create_link_sd (after mdadm)

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Plase fix your device name lifetimes.

See the DM commit

    63a4f0 ("dm: fix add_disk() NULL pointer due to race with free_dev()")

for a template.

Unregistering the device too early means we'll have half constructed
bdis hanging around, which caused all kinds of problems for filesystems
and the writeback code.
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