https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243890
Bug ID: 243890
Summary: md may hang in mddestroy
Product: Base System
Version: 11.3-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: m...@freebsd.org
If an md you're trying to unconfigure is part of a ccd, the attempt will hang
in an uninterruptible syscall mddestroy until all of the ccds involving the md
are unconfigured:
load: 2.10 cmd: mdconfig 54293 [mddestroy] 6.10r 0.00u 0.00s 0% 2384k
load: 1.84 cmd: mdconfig 54293 [mddestroy] 43.38r 0.00u 0.00s 0% 2384k
load: 1.66 cmd: mdconfig 54293 [mddestroy] 184.61r 0.00u 0.00s 0% 2384k
Worse, while this is happening, any attempt to use mdconfig (even to just list
the configured mds) will crash (segmentation fault).
The good news is, once the ccds are all destroyed, the hanging mdconfig will
exit nicely.
But it, probably, should fail immediately with an EBUSY or equivalent...
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