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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