Created attachment 517250 [details] bisect log It's not possible to unlock my external usb drive that is luks encrypted with kernel 4.15. There are no issues with the encrypted internal drives. cryptsetup --verbose --debug luksOpen /dev/sde luks-backup just hangs after: Udev cookie 0xd4d7eef (semid 131072) waiting for zero The bisecting ended up at the following commit: a6a252e6491443c1c18eab7e254daee63d4a7a04 is the first bad commit commit a6a252e6491443c1c18eab7e254daee63d4a7a04 Author: Ming Lei <ming.lei@redhat.com> Date: Thu Nov 2 23:24:36 2017 +0800 blk-mq-sched: decide how to handle flush rq via RQF_FLUSH_SEQ In case of IO scheduler we always pre-allocate one driver tag before calling blk_insert_flush(), and flush request will be marked as RQF_FLUSH_SEQ once it is in flush machinery. So if RQF_FLUSH_SEQ isn't set, we call blk_insert_flush() to handle the request, otherwise the flush request is dispatched to ->dispatch list directly. This is a preparation patch for not preallocating a driver tag for flush requests, and for not treating flush requests as a special case. This is similar to what the legacy path does. Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Created attachment 517252 [details] cryptsetup fail
Created attachment 517254 [details] cryptsetup success
This is fixed with sys-kernel/vanilla-sources-4.16.0 The issue was: https://patchwork.kernel.org/patch/10206089/
