On 6/23/25 6:18 PM, Damien Le Moal wrote:
For a nicer solution, which is mostly DM-based, combine what I sent you to
force write BIOs to be split early for zoned DM devices together with the patch
[1], which I sent already but needs more work. This combination was tested by
Shin'ichiro and he could not reproduce the hang with both patches applied.
[1] https://lore.kernel.org/dm-devel/20250611011340.92226-1-dlemoal@xxxxxxxxxx/
As far as I can tell, dm-crypt is the only DM target driver supporting zones
that splits write operations "under the hood". But I will check again.
Hi Damien,
With both patches applied on top of Jens' for-next branch (2d5a3220c1f5
("Merge branch 'block-6.16' into for-next"), I can't reproduce the
deadlock anymore. This is unexpected because the deadlock happens
between the queue freezing mechanism and zwplug->bio_list. No
matter how bios are split, if bios are queued faster than these are
processed, one or more bios end up on zwplug->bio_list and this deadlock
can happen.
Did I perhaps overlook or misunderstand something?
Thanks,
Bart.
