panic: mutex tcp owned at /usr/src/sys/netinet/tcp_input.c:2475

Kris Kennaway kris at obsecurity.org
Sun May 13 23:24:14 UTC 2007


On Mon, May 14, 2007 at 12:55:40AM +0200, Stefan Bethke wrote:
> 
> Am 14.05.2007 um 00:21 schrieb Kris Kennaway:
> 
> >On Mon, May 14, 2007 at 12:17:28AM +0200, Stefan Bethke wrote:
> >>
> >>Am 13.05.2007 um 21:45 schrieb Attilio Rao:
> >>
> >>>2007/5/11, Stefan Bethke <stb at lassitu.de>:
> >>>>
> >>>>Am 11.05.2007 um 22:33 schrieb Andre Oppermann:
> >>>>
> >>>>>Stefan Bethke wrote:
> >>>>>>Got this reproducable panic on AMD64 on a couple of days old -
> >>>>>>current  when I try to copy a file off a ZFS dataset via
> >>>>>>netatalk's afpd (via  TCP, no actual AppleTalk involved).
> >>>>>
> >>>>>This is a recursive leak of the INP_INFO_LOCK() you've hit here.
> >>>>>We don't
> >>>>>know yet where it gets leaked but we're working on it.
> >>>>
> >>>>Hhm.  I can trigger it very easily.  I don't have a serial  
> >>>>console on
> >>>>this box, but I could try a few things in a debugger if anyone  
> >>>>wants
> >>>>me to look at anything in particular.
> >>>
> >>>Hello Stefan,
> >>>can you please recompile your kernel with INVARIANTS, DDB and KTR
> >>>support?
> >>>
> >>>Just add those lines:
> >>>options INVARIANTS
> >>>options INVARIANT_SUPPORT
> >>>options KDB
> >>>options DDB
> >>>options KTR
> >>>options KTR_COMPILE=(KTR_LOCK)
> >>>options KTR_ENTRIES=65534
> >>>
> >>>and possibly remove kbdmux from your config file (not sure if it has
> >>>still problems with our syscons, though).
> >>>
> >>>Then, when you hit that panic you should just be redirected to ddb.
> >>>At that point please write 'show ktr' in the ddb prompt and report
> >>>what it shows.
> >>
> >>Left kbdmux in for the moment. Hit the panic, and show ktr shows
> >>nothings:
> >>
> >>db> show ktr
> >>--- End of trace buffer ---
> >>db>
> >>
> >>If you think it's useful, I can remove kdbmux as well and try again.
> >
> >You also need KTR_MASK=(KTR_LOCK) (or set debug.ktr.mask at runtime),
> >this filters the events that are logged.
> 
> Nothing still.

OK, KTR_ENTRIES is also wrong as suggested by attilio, it must be a
power of 2.  Try 32768 or 65536 (the latter may be too large depending
on your architecture).

Kris


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