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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Mailman-Approved-At: Thu, 14 Apr 2022 11:17:24 +0000 Subject: [dm-devel] [bug report] BUG for REQ_OP_WRITE_ZEROES to dm-zoned X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Damien Le Moal Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-ID: <2BB24309023D7B4BB928983CB4FCFF02@namprd04.prod.outlook.com> Hello Mike, Let me share a BUG I observed with v5.18-rcX and ask comments for the fix. BUG_ON(dm_tio_flagged(tio, DM_TIO_IS_DUPLICATE_BIO)) in dm_accept_partial_bio() was triggered for dm-zoned. It happens when a bio with REQ_OP_WRITE_ZEROES and sector range which goes across zone boundaries of the zoned devices that dm-zoned maps. For such bios, dm-zoned calls dm_accept_partial_bio() to trim the bio to fit in a zone. And dm core sets the flag DM_TIO_IS_DUPLICATE_BIO to the tio of the bio. The BUG_ON symptom can be recreated with command as follows: # xfs_io -C "fzero 4096 $((512 * $(len_ptr shared among the cloned bios from updates in dm_accept_partial_bio(). One point I can not understand is that the flag is set even when __send_duplicate_bios() clones only single bio. I think bio is not duplicated in this case, and there is no need to guard tio->len_ptr. Dm-zoned sets 1 to ti->num_write_zeroes_bios (and ti->num_discard_bios), then I think __send_duplicate_bios() always clones single bio for dm-zoned. I tried following patch below, which removes the flag set for the single bio clone case. With this patch, the BUG is no longer triggered. Is this a right fix approach? It looks for me the DM_TIO_IS_DUPLICATE_BIO check is too tight and I think we can relax it for the single clone case. If I miss anything and the len_ptr guard by DM_TIO_IS_DUPLICATE_BIO is required even for the single bio clone case, I will think about dm-zoned change to avoid dm_accept_partial_bio() call, which will need bio split within dm-zoned. Reviewed-by: Damien Le Moal Tested-by: Shinichiro Kawasaki diff --git a/drivers/md/dm.c b/drivers/md/dm.c index f2397546b93f..d886c57e49ed 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1363,7 +1363,6 @@ static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, break; case 1: clone = alloc_tio(ci, ti, 0, len, GFP_NOIO); - dm_tio_set_flag(clone_to_tio(clone), DM_TIO_IS_DUPLICATE_BIO); __map_bio(clone); break; default: