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Go Back   Linux Archive > Redhat > Device-mapper Development

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Old 09-01-2008, 01:48 PM
Stefan Raspl
Default bdev lost its queue

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);

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,

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

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