Public bug reported:
When device disappears from the system "mdadm -If" is triggered by udev
and drive is removed from the corresponding array and container. The
missing close() in metadata manager (mdmon) causes that userspace
handler to the device is still opened (can be tracked by lsof -p
<mdmon_pid>).
For nvme drives it causes weird namespace number after hot-plug (e.g. will
appear nvme1n2). The issue affects only IMSM metadata format.
Reproducible on Focal with latest mdadm 4.1-5ubuntu1.
Steps:
1. Create IMSM container:
#mdadm -CR imsm -e imsm -n2 /dev/nvme[01]n1
2. Create IMSM array:
#mdadm -CR vol1 -l1 -n2 /dev/nvme[01]n1
3. remove via sysfs drive:
#echo 1 > /sys/block/nvme0n1/device/device/remove
4. restore the same drive:
#echo 1 > /sys/bus/pci/rescan
5. see mdstat and lsblk:
# cat /proc/mdstat
Result:
/dev/nvme0n2 appears in system.
** Affects: mdadm (Ubuntu)
Importance: Undecided
Status: New
** Tags: patch-accepted-upstream
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https://bugs.launchpad.net/bugs/1868708
Title:
mdmon: device descriptor is not closed
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