System call recvfrom returning with the following locks held ...

I got this on an alpha machine overnight.  Is this fixed already?

Kris

System call recvfrom returning with the following locks held:
exclusive sleep mutex Giant r = 0 (0xfffffc000069ac88) locked _at_ /a/asami/portbuild/alpha/src-client/sys/kern/uipc_syscalls.c:944
panic: witness_warn
Stack backtrace:
db_print_backtrace() at db_print_backtrace+0x18
backtrace() at backtrace+0x2c
panic() at panic+0x148
witness_warn() at witness_warn+0x254
syscall() at syscall+0x530
XentSys() at XentSys+0x64
--- syscall (38) ---
--- user mode ---
panic