Date: Sat, 14 Sep 2002 22:06:27 -0400 From: Rahul Siddharthan <rsidd@online.fr> To: Julian Elischer <julian@elischer.org> Cc: stable@freebsd.org, multimedia@freebsd.org Subject: Re: USB audio kernel panics Message-ID: <20020915020627.GA241@papagena.rockefeller.edu> In-Reply-To: <Pine.BSF.4.21.0209131109450.76610-100000@InterJet.elischer.org> References: <20020913121704.GA286@papagena.rockefeller.edu> <Pine.BSF.4.21.0209131109450.76610-100000@InterJet.elischer.org>
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Julian Elischer said on Sep 13, 2002 at 11:18:54:
> > > can you do a 'list' here?
> > > as well as "info locals" and
> > > print anything that looks suspicious?
> >
> > I don't know what looks suspicious, but here's the whole lot below --
> > first for the panic I quoted (pulling out the USB cord while busy),
> > then for a different panic (starting the KDE artsd daemon).
[....]
> > ------------------
> >
> > First, for what I sent earlier: pulling out the USB cord
> >
> > ------------------
> >
> > #16 0xc0235813 in uhci_device_isoc_start (xfer=0xc100d300)
> > at /usr/src/sys/dev/usb/uhci.c:2097
> > 2097 LIST_INSERT_HEAD(&sc->sc_intrhead, ii, list);
> > (kgdb) list
> > 2092 if (!ii->isdone) {
> > 2093 printf("uhci_device_isoc_start: not done, ii=%p\n", ii);
> > 2094 }
> > 2095 ii->isdone = 0;
> > 2096 #endif
> > 2097 LIST_INSERT_HEAD(&sc->sc_intrhead, ii, list);
> > 2098
> > 2099 splx(s);
> > 2100
> > 2101 return (USBD_IN_PROGRESS);
> > (kgdb) info locals
> > upipe = (struct uhci_pipe *) 0x0
> > sc = (uhci_softc_t *) 0xc0f9c200
> > ii = (uhci_intr_info_t *) 0xc0fae8c0
> > end = (uhci_soft_td_t *) 0x68c840
> > s = 6867008
> > i = 0
>
> print sc->sc_intrhead
> and if there is something already on the list, print that.
> also print *ii
(kgdb) print sc->sc_intrhead
$1 = {lh_first = 0x558d026a}
(kgdb) print *ii
$2 = {sc = 0xc0ebb000, xfer = 0xc100d300, stdstart = 0xc0fa52c0,
stdend = 0xc0fa52c0, list = {le_next = 0x558d026a, le_prev = 0xc0ebbc78},
timeout_handle = {callout = 0x0}}
It means nothing to me :(
> > -----------------
> >
> > Below, a panic generated by starting up KDE's artsd while the USB device
> > is plugged in securely.
> >
> > -----------------
> >
> > #16 0xc029bb93 in trap (frame={tf_fs = 6815760, tf_es = -1056571376,
> > tf_ds = 16, tf_edi = 1, tf_esi = -1056113184, tf_ebp = -1070635404,
> > tf_isp = -1070635452, tf_ebx = -1056138112, tf_edx = 125511200,
> > tf_ecx = -846746112, tf_eax = 2, tf_trapno = 12, tf_err = 0,
> > tf_eip = -1071429335, tf_cs = 8, tf_eflags = 66050,
> > tf_esp = -1057941184, tf_ss = -1056113184})
> > at /usr/src/sys/i386/i386/trap.c:466
> > 466 (void) trap_pfault(&frame, FALSE, eva);
> >
> > (kgdb) up
> > #17 0xc0234929 in uhci_idone (ii=0xc10cfde0)
> > at /usr/src/sys/dev/usb/uhci.c:1129
> > 1129 for (std = ii->stdstart; std != NULL; std = std->link.std) {
> > (kgdb) list
> > 1124 uhci_dump_tds(ii->stdstart);
> > 1125 #endif
> > 1126
> > 1127 /* The transfer is done, compute actual length and status. */
> > 1128 actlen = 0;
> > 1129 for (std = ii->stdstart; std != NULL; std = std->link.std) {
> > 1130 nstatus = LE(std->td.td_status);
> > 1131 if (nstatus & UHCI_TD_ACTIVE)
> > 1132 break;
> > 1133
> > (kgdb) info locals
>
> If this really is where the error is.. is it possile something further in the
> loop clears std?
This is the complete loop,
for (std = ii->stdstart; std != NULL; std = std->link.std) {
nstatus = LE(std->td.td_status);
if (nstatus & UHCI_TD_ACTIVE)
break;
status = nstatus;
if (UHCI_TD_GET_PID(LE(std->td.td_token)) != UHCI_TD_PID_SETUP)
actlen += UHCI_TD_GET_ACTLEN(status);
}
Sorry, this doesn't mean much either to me... is it getting cleared in
the loop? Doesn't look like it to me.
I checked by creating this panic again, it is again at the same spot.
Since it's so trivial to produce this panic, can't whoever merged the
code into -stable take a look at it? Or do things work fine on their
machine?
Rahul
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