[Bug 226510] panic: Re-refing for reason 5, cnt = 1

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226510

--- Comment #22 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=bb8441184bab60cd8a07c2b94bd6c4ae8b56ec25

commit bb8441184bab60cd8a07c2b94bd6c4ae8b56ec25
Author:     Robert Wing <rew@FreeBSD.org>
AuthorDate: 2022-01-04 01:21:58 +0000
Commit:     Robert Wing <rew@FreeBSD.org>
CommitDate: 2022-01-04 01:56:48 +0000

    cam: don't lock while handling an AC_UNIT_ATTENTION

    Don't take the device_mtx lock in daasync() when handling an
    AC_UNIT_ATTENTION. Instead, assert the lock is held before modifying the
    periph's softc flags.

    The device_mtx lock is taken in xptdevicetraverse() before daasync()
    is eventually called in xpt_async_bcast().

    PR:             240917, 226510, 226578
    Reviewed by:    imp
    MFC after:      3 weeks
    Differential Revision: https://reviews.freebsd.org/D27735

 sys/cam/scsi/scsi_da.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

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