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b3ce757213
When a namespace on a multipath controller is updated,
nvme_update_ns_info() freezes the head disk queue, commits the new
limits, and then calls nvme_mpath_revalidate_zones() before it
unfreezes the queue again.
That is the wrong way round for blk_revalidate_disk_zones(). It starts
a limits update, which takes q->limits_lock, and it freezes the queue
itself while updating the zone resources. The block layer takes
limits_lock before freezing the queue, never the other way around, so
calling it with the head queue already frozen reverses that order.
syzbot has hit this twice. One report goes through q->limits_lock. The
other one is on linux-next, where blk_revalidate_disk_zones() also
takes disk->zone_revalidate_mutex and holds it across alloc_workqueue()
the first time a disk's zone resources are set up. Lockdep then sees:
q_usage_counter(io) (frozen head queue, nvme_update_ns_info())
--> &disk->zone_revalidate_mutex
--> wq_pool_mutex --> fs_reclaim --> q_usage_counter(io)
WARNING: possible circular locking dependency detected
kworker/u8:10/3352 is trying to acquire lock:
(&disk->zone_revalidate_mutex){+.+.}-{4:4}, at: blk_revalidate_disk_zones+0x1c5/0x1650
but task is already holding lock:
(&q->q_usage_counter(io)#75){++++}-{0:0}, at: nvme_update_ns_info+0x3ac/0x1200
...
blk_revalidate_disk_zones+0x1c5/0x1650 block/blk-zoned.c:2560
nvme_mpath_revalidate_zones+0x106/0x1c0 drivers/nvme/host/multipath.c:301
nvme_update_ns_info+0x984/0x1200 drivers/nvme/host/core.c:2620
The rest of the driver already does this correctly:
nvme_update_ns_info_block() unfreezes ns->disk->queue before calling
blk_revalidate_disk_zones(), and nvme_mpath_set_live() revalidates the
head zones without freezing the queue. Do the same here, and only
revalidate the head zones once the queue is unfrozen and the limits
update has succeeded.
Fixes:
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