[Bug 260591] kern/subr_bus.c: device_probe_and_{attach|detach}: Insufficient multi-thread protection causes crash

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 21 Dec 2021 22:11:28 UTC

Kubilay Kocak <koobs@FreeBSD.org> changed:

           What    |Removed                     |Added
           Keywords|                            |crash, needs-qa
           See Also|                            |https://reviews.freebsd.org
                   |                            |/D31833,
                   |                            |https://reviews.freebsd.org
                   |                            |/D19375
              Flags|                            |maintainer-feedback?(imp@Fr
                   |                            |eeBSD.org),
                   |                            |maintainer-feedback?(mw@Fre
                   |                            |eBSD.org), mfc-stable13?,
                   |                            |mfc-stable12?
                 CC|                            |imp@FreeBSD.org,
                   |                            |mw@FreeBSD.org
            Version|CURRENT                     |13.0-RELEASE
            Summary|[attach/detach] [panic]     |kern/subr_bus.c:
                   |insufficient multi-thread   |device_probe_and_{attach|de
                   |protection for              |tach}: Insufficient
                   |probe/attach/detach         |multi-thread protection
                   |                            |causes crash
             Status|New                         |Open

--- Comment #1 from Kubilay Kocak <koobs@FreeBSD.org> ---
Some recent work [1] with Giant replacement in subr_bus and portentially
relatged work with respect to [2], which mentions "patch works around the real
issue, which is a locking deficiency of the busses.

Request feedback from those committers accordingly. 

[1] https://reviews.freebsd.org/D31833
[2] https://reviews.freebsd.org/D19375

^Triage: Set version to earliest supported and confirmed reproduction.

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