On Fri, Jun 04, 2021 at 07:52:35AM -0700, Bart Van Assche wrote: > Damien is right. bd_disk can be NULL. From bd_disk is initialized in bdev_alloc, so it should never be NULL. bi_bdev OTOH is only set afer bio_add_page in various places or not at all in case of passthrough bios. Which is a bit of a mess and I have plans to fix it.