[dm-devel] bdev lost its queue

[Stefan Raspl]

We conducted a bunch tests where we used various ways to forcefully 
disconnect or temporarily disable DASD disks from an IBM System z 
machine. In the course we ran into a kernel panic in 
dm_table_unplug_all() (dm-table.c), specifically at

     struct request_queue *q = bdev_get_queue(dd->bdev);
     blk_unplug(q);

since the queue of the bdev was NULL.
Did anyone see a crash in this place before? And are there other disk 
drivers to can set their queue to NULL due to unplugging/outages or similar?

Best regards,
Stefan

-- 
Linux on System z
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschäftsführer: Erich Baier
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294