Re: panic: mutex Giant not owned at /usr/src/sys/kern/tty_ttydisc.c:1127

On Fri, Jan 23, 2009 at 05:29:20PM +0100, Ed Schouten wrote:
> Hello Lars,
> 
> As HPS said, the issue seems to be related to ubt, but there's still
> something else that is interesting to see here:
> 
> * Lars Engels <lme_at_FreeBSD.org> wrote:
> > #2  0xc0859512 in panic (fmt=Variable "fmt" is not available.
> > ) at /usr/src/sys/kern/kern_shutdown.c:576
> > #3  0xc0849fc7 in _mtx_assert (m=0xc0d76e90, what=4, file=0xc0c30b4c "/usr/src/sys/kern/tty_ttydisc.c", line=1127) at /usr/src/sys/kern/kern_mutex.c:639
> > #4  0xc08aebad in ttydisc_getc (tp=0xc4650c00, buf=0xf12ea920, len=128) at /usr/src/sys/kern/tty_ttydisc.c:1127
> > #5  0xc0740604 in sctty_outwakeup (tp=0xc4650c00) at /usr/src/sys/dev/syscons/syscons.c:323
> > #6  0xc0740b6c in scgetc (sc=0xc0f11f20, flags=3) at /usr/src/sys/dev/syscons/syscons.c:3281
> > #7  0xc0741190 in sc_cngetc (cd=0xc0cc9be0) at /usr/src/sys/dev/syscons/syscons.c:1607
> > #8  0xc0821a28 in cncheckc () at /usr/src/sys/kern/kern_cons.c:379
> > #9  0xc0821a66 in cngetc () at /usr/src/sys/kern/kern_cons.c:357
> > #10 0xc04bfb15 in db_readline (lstart=0xc0d45cc0 "\n", lsize=120) at /usr/src/sys/ddb/db_input.c:326
> 
> Sam Leffler also reported this issue to me privately. I'll see what I
> can do to fix this.


Thanks a lot. BTW it doesn't panic on every boot but only from time to
time.