[Bug 219988] [kernel] sys/kern/kern_sysctl.c:a sleep-under-rmlock bug in sysctl_add_oid

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219988

Mateusz Guzik <mjg at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |mjg at FreeBSD.org

--- Comment #2 from Mateusz Guzik <mjg at FreeBSD.org> ---
The lock at hand is initialized with RM_SLEEPABLE, i.e. sleep is permitted.

It probably is desirable to turn it into a non-sleepable lock, but I don't
think it's a high priority (and right now I don't even if this is feasible).

The patch at hand is definitely incomplete even for sysctl_add_oid. strdup also
performs M_WAITOK.

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