[Bug 1384062] Re: os-prober kills ceph OSD

[Dr. Jens Rosenboom]

Forgot to mention that the Ceph cluster has to be under write load in
order to reproduce, i.e. running something like

rados -p rbd bench 600 write -t 1 --show-time --run-length 60

There is no effect of running os-prober if the cluster is idle. Based
with that information, though, I can also reproduce the issue by running
fio on some partition and os-prober in parallel, getting:

# fio --ioengine=libaio --filename=/dev/sdc4 --bs=64k --rw=randwrite --runtime=300 --size=1G --direct=1 --iodepth=8 --name=a
a: (g=0): rw=randwrite, bs=64K-64K/64K-64K/64K-64K, ioengine=libaio, iodepth=8
fio-2.2.13
Starting 1 process
fio: io_u error on file /dev/sdc4: Operation not permitted: write offset=531300352, buflen=65536
fio: pid=17543, err=1/file:io_u.c:1596, func=io_u error, error=Operation not permitted

So I think the error has nothing to do with Ceph in particular, but
really os-prober should be made more conservative when trying to probe
partitions.

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Title:
  os-prober kills ceph OSD

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