[Bug 251803] rctl -a user:test:readiops:throttle=0/user crash the system

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251803

--- Comment #7 from commit-hook at FreeBSD.org ---
A commit in branch stable/12 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=70cdab054c8ffe7f5561ab8f31db33ee62d12c9c

commit 70cdab054c8ffe7f5561ab8f31db33ee62d12c9c
Author:     Jason A. Harmening <jah at FreeBSD.org>
AuthorDate: 2020-12-30 23:29:44 +0000
Commit:     Jason A. Harmening <jah at FreeBSD.org>
CommitDate: 2021-01-26 03:57:44 +0000

    rctl(4): support throttling resource usage to 0

    For rate-based resources that support throttling (e.g.
    readiops/writeips), this fixes a divide-by-zero panic when rctl(8)
    passes 0 as the throttle value.  For these resources, treat
    zero-throttle requests as requests to suspend forward progress as long
    as possible using the duration specified in
    kern.racct.rctl.throttle_max.

    PR:             251803
    Reported by:    chris at cretaforce.gr

    (cherry picked from commit e8a5a1ad7154dc34e3a5234267e19faa86d5ff33)

 sys/kern/kern_rctl.c | 5 +++++
 1 file changed, 5 insertions(+)

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