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