Bug 523387 - mdadm --stop /dev/md# should remove md# from sysfs and /dev
mdadm --stop /dev/md# should remove md# from sysfs and /dev
Product: Fedora
Classification: Fedora
Component: mdadm (Show other bugs)
All Linux
low Severity medium
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Assigned To: Doug Ledford
Fedora Extras Quality Assurance
Depends On:
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Reported: 2009-09-15 06:04 EDT by Hans de Goede
Modified: 2010-02-19 15:47 EST (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2010-02-19 15:47:08 EST
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Description Hans de Goede 2009-09-15 06:04:32 EDT
mdadm --stop /dev/md#

Results in md# being removed from /proc/mdstat (as it should), but for some
reason /sys/block/md# (and thus the /dev/md# created by udev) stick around.

Monitoring udev events reveals that /sys/block/md# actually disappears, but
at the very end seems to get recreated (by mdadm I assume) for some strange
Comment 1 Bug Zapper 2009-11-16 07:25:02 EST
This bug appears to have been reported against 'rawhide' during the Fedora 12 development cycle.
Changing version to '12'.

More information and reason for this action is here:
Comment 2 Doug Ledford 2010-02-19 15:47:08 EST
This doesn't appear to be related to mdadm in any way.  An strace of mdadm shows that it has nothing to do with the recreate events that the kernel issues to udev.  I suspect that when they attempted to change the kernel to completely remove stopped devices, that either race conditions or user space breakages were encountered, so now the kernel stops the active array and recreates a new, blank array place holder.  As such I'm closing this as WONTFIX (partially because regardless of whether or not it's fixed, mdadm isn't the culprit, and partially because I suspect it really needs to be WONTFIX until upstream decides to fix it).

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