On Wed, Feb 01, 2017 at 11:32:12AM -0800, Dan Williams wrote: > Warnings of the following form occur because scsi reuses a devt number > while the block layer still has it referenced as the name of the bdi > [1]: > > WARNING: CPU: 1 PID: 93 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x62/0x80 > sysfs: cannot create duplicate filename '/devices/virtual/bdi/8:192' > [..] > Call Trace: > dump_stack+0x86/0xc3 > __warn+0xcb/0xf0 > warn_slowpath_fmt+0x5f/0x80 > ? kernfs_path_from_node+0x4f/0x60 > sysfs_warn_dup+0x62/0x80 > sysfs_create_dir_ns+0x77/0x90 > kobject_add_internal+0xb2/0x350 > kobject_add+0x75/0xd0 > device_add+0x15a/0x650 > device_create_groups_vargs+0xe0/0xf0 > device_create_vargs+0x1c/0x20 > bdi_register+0x90/0x240 > ? lockdep_init_map+0x57/0x200 > bdi_register_owner+0x36/0x60 > device_add_disk+0x1bb/0x4e0 > ? __pm_runtime_use_autosuspend+0x5c/0x70 > sd_probe_async+0x10d/0x1c0 > async_run_entry_fn+0x39/0x170 > > This is a brute-force fix to pass the devt release information from > sd_probe() to the locations where we register the bdi, > device_add_disk(), and unregister the bdi, blk_cleanup_queue(). > > Thanks to Omar for the quick reproducer script [2]. This patch survives > where an unmodified kernel fails in a few seconds. > > [1]: https://marc.info/?l=linux-scsi&m=147116857810716&w=4 > [2]: http://marc.info/?l=linux-block&m=148554717109098&w=2 Thanks, Dan, this fixes it for me, too. Tested-by: Omar Sandoval <osandov@xxxxxx> > Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> > Cc: Bart Van Assche <bart.vanassche@xxxxxxxxxxx> > Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx> > Cc: Christoph Hellwig <hch@xxxxxx> > Cc: Jens Axboe <axboe@xxxxxxxxx> > Cc: Jan Kara <jack@xxxxxxx> > Reported-by: Omar Sandoval <osandov@xxxxxxxxxxx> > Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> > --- > Changes in v2: > * rebased on top of Jan's bdi lifetime series > * replace kref_{get,put}() with atomic_{inc,dec_and_test} (Christoph) > > block/blk-core.c | 1 + > block/genhd.c | 7 +++++++ > drivers/scsi/sd.c | 41 +++++++++++++++++++++++++++++++++-------- > include/linux/blkdev.h | 1 + > include/linux/genhd.h | 17 +++++++++++++++++ > 5 files changed, 59 insertions(+), 8 deletions(-)
