Re: [Xen-devel] [PATCH] Fix blkback/blktap sysfs read bug.

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> "Joe Jin" <joe.jin@xxxxxxxxxx> 19.01.10 10:52 >>>
>At backend driver blkback and blktap, when checking statistics information,
>at the time vbd device remove, kernel will crash.
>
>Below patch will fix it, please review and apply.

This isn't a complete fix if I follow your analysis: There's still a race
between blk{back,tap}_remove() freeing be->blkif/be and the sysfs
code. dev->dev.driver_data (and possibly be->blkif) must be cleared
before freeing it (them).

Jan



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