Date: Sat, 17 Feb 2018 13:01:00 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Warner Losh <imp@FreeBSD.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: panic in daprobedone: Unholding 4 with cnt = 0 Message-ID: <fc0dc6c5-2ef4-db6b-cfa8-7868144ba6ab@selasky.org>
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I've started to hit this panic with USB mass storage, before even the
device has become in-use:
panic: Unholding 4 with cnt = 0
Backtrace:
vpanic()
panic()
daprobedone()
dadone()
xpt_done_process()
xpt_done_td()
fork_exit()
fork_trampoline()
db>
> static inline void
> da_periph_unhold(struct cam_periph *periph, da_ref_token token)
> {
> int cnt;
> struct da_softc *softc = periph->softc;
>
> token_sanity(token);
> DA_PERIPH_PRINT(periph, "Unholding device %s (%d)\n",
> da_ref_text[token], token);
> cnt = atomic_fetchadd_int(&softc->ref_flags[token], -1);
> if (cnt != 1)
> panic("Unholding %d with cnt = %d", token, cnt);
> cam_periph_unhold(periph);
> }
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