On Tue, Feb 25, 2020 at 06:07:44PM +0100, Daniel Glöckner wrote: > In cases where dec_in_flight has to requeue the integrity_bio_wait work > to transfer the rest of the data, the __bi_remaining field of the bio > might already have been decremented to zero. Reusing the bio without > reinitializing that counter to 1 can then result in integrity_end_io > being called too early when the BIO_CHAIN flag is set, f.ex. due to > blk_queue_split. In our case this triggered the BUG() in > blk_mq_end_request when the hardware signalled completion of the bio > after integrity_end_io had modified it. > > Signed-off-by: Daniel Glöckner <dg@xxxxxxxxx> Drivers have no business poking into these internals. If a bio is reused the caller needs to use bio_reset instead.
