Transmission

You need to forget about blaming Transmission. It is just making your computer do work. KPs have to be addressed systematically. You do have a lot of third-party kexts and some have blamed Little Snitch and sockets are involved.

Actually, I don't.
Seeing as I updated Transmission, and it's the ...

She just went again.

Sun Aug 25 23:31:00 2013
panic(cpu 2 caller 0xffffff8018b9e3f3): "soreceive: sb 0xffffff802dc258a0 so 0xffffff802dc25830 cc 81 mbcnt 2304 mb 0xffffff8102bcda00 mbtail 0xffffff8102bcda00 " "lastrecord 0xffffff8102bcda00\n"@/SourceCache/xnu/xnu-2050.24.15/bsd/kern/uipc_socket2.c ...

Well, after a day of being fine if I let only one transfer run at a time, it's fallen over again.
Interval Since Last Panic Report: 70247 sec
Panics Since Last Report: 5
Anonymous UUID: CDEE8009-AE65-5DC7-5A47-B4415B5F01F2

Sun Aug 25 20:45:15 2013
panic(cpu 2 caller 0xffffff801519e3f3): "soreceive ...

Yup, same thing happening here in OS X 10.8.4.
I have a number of USB drives hanging off the machine - the previous versions of Transmission was fine, but since the last update it's been causing restarts if it's running downloads. It's fine if it's open and running without any active transfers, but ...