panic: sbflush_internal: cc 4294966301 || mb 0 || mbcnt 0

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Hi,

i can trigger this kind of panic quite easily where running
mldonkey-devel port and downloading something via BitTorrent.

This is -current as of Feb 03 2007. I upgraded this box from -stable to
- -current end November 2006 and it has been happening since. When i do
not run mldonkey the box is quite stable e.g. no other panics.

Google turned up only one other occurrence of this on a german BSD
forum, mldonkey was also involved there...

I already have "options         SOCKBUF_DEBUG" enabled. What can i do to
get more useful information ? I have a dump but it seems to be
corrupted... I'll try to get a usable dump.

This happens with stock FreeBSD ppp as well as with mdp4 from ports.
Kernel is a stripped down GENERIC wich pf added.

Here the trace from ddb:

panic: sbflush_internal: cc 4294966301 || mb 0 || mbcnt 0
KDB: enter: panic
[thread pid 53458 tid 100128 ]
Stopped at      kdb_enter+0x2b: nop
db> where
Tracing pid 53458 tid 100128 td 0xc12abcb0
kdb_enter(c06ace58) at kdb_enter+0x2b
panic(c06b0aae,fffffc1d,0,0,c133919c,...) at panic+0xbb
sbflush_internal(c133919c,c8109aa0,c05516ee,c133919c,c133914c,...) at
sbflush_internal+0x6f
sbflush_locked(c133919c) at sbflush_locked+0xb
sbflush(c133919c,c133914c,c1316150,0,c133914c,...) at sbflush+0x3a
tcp_disconnect(c134eb28) at tcp_disconnect+0x4b
tcp_usr_disconnect(c133914c,c8109af8,c05525b9,c133914c,0,...) at
tcp_usr_disconnect+0x88
sodisconnect(c133914c,0,c13213a8,0,0,...) at sodisconnect+0x26
soclose(c133914c) at soclose+0x31
soo_close(c13213a8,c12abcb0) at soo_close+0x5f
fdrop_locked(c13213a8,c12abcb0,c18cd900,c8109ba4,c04ef3c7,...) at
fdrop_locked+0xc8
fdrop(c13213a8,c12abcb0,c0f74b84,c093ab80,0,...) at fdrop+0x3d
closef(c13213a8,c12abcb0) at closef+0x407
fdfree(c12abcb0) at fdfree+0x56b
exit1(c12abcb0,0,c8109d2c,c0680b12,c12abcb0,...) at exit1+0x427
exit1(c12abcb0,c8109d00) at exit1
syscall(c8109d38) at syscall+0x2a2
Xint0x80_syscall() at Xint0x80_syscall+0x20
- --- syscall (3, FreeBSD ELF32, read), eip = 0x2, esp = 0x292, ebp = 0 ---

Let me know if i can do anything more to help tracking this down.

Cheers
Florian
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