This patchset fixed the NULL pointer issue triggered by blktests block/025 https://lore.kernel.org/linux-block/YWfJ06KX3HT1nANX@xxxxxxxxxxxxx/T/#mbf26cd34c88660ce0221dd7933b294a0b0298319 Tested-by: Yi Zhang <yi.zhang@xxxxxxxxxx> On Wed, Sep 29, 2021 at 3:14 PM Christoph Hellwig <hch@xxxxxx> wrote: > > Ming reported that for SCSI we have a lifetime problem now that > the BDI moved from the request_queue to the disk as del_gendisk > doesn't finish all outstanding file system I/O. It turns out > this actually is an older problem, although the case where it could > be hit before was very unusual (unbinding of a SCSI upper driver > while the scsi_device stays around). This series fixes this by > draining all I/O in del_gendisk. > > Changes since v2: > - move the call to submit_bio_checks into freeze protection > > Changes since v1: > - fix a commit log typo > - keep the existing nowait vs queue dying semantics in bio_queue_enter > - actually keep q_usage_counter in atomic mode after del_gendisk > -- Best Regards, Yi Zhang
