panic: trying to sleep while sleeping is prohibited - USB network panic after ifconfig

[Scott Ullrich]

Sleeping on "usbsyn" with the following non-sleepable locks held:
exclusive sleep mutex in_multi_mtx r = 0 (0xc0acfbc0) locked @ /usr/src/sys/neti
net/in.c:971
KDB: stack backtrace:
kdb_backtrace(1,c27e5418,c27e7000,1,ccfe3a50) at kdb_backtrace+0x29
witness_warn(5,0,c0993d00,c09846cb) at witness_warn+0x18e
msleep(c27ffb00,0,4c,c09846cb,0) at msleep+0x42
usbd_transfer(c27ffb00,ccfe3ab0,c0649b2d,c27ffb00,c24a1580) at usbd_transfer+0x1
21
usbd_sync_transfer(c27ffb00,c24a1580,ccfe3acc,c06c6ea4,c25d0a00) at usbd_sync_tr
ansfer+0x11
usbd_do_request_flags_pipe(c257d600,c257d280,ccfe3b0c,ccfe3b0b,0) at usbd_do_req
uest_flags_pipe+0x5d
usbd_do_request_flags(c257d600,ccfe3b0c,ccfe3b0b,0,0) at usbd_do_request_flags+0
x20
usbd_do_request(c257d600,ccfe3b0c,ccfe3b0b) at usbd_do_request+0x1a
aue_csr_read_1(c25d0a00,0) at aue_csr_read_1+0x50
aue_setmulti(c25d0a00,c280e280,c25d3000,ccfe3ba8,ccfe3b78) at aue_setmulti+0x4a
aue_ioctl(c25d3000,80206931,0) at aue_ioctl+0x106
if_addmulti(c25d3000,ccfe3ba8,ccfe3ba4,ccfe3ba8,10,c0acfbc0,0,c09a3cd4,3cb) at i
f_addmulti+0x1b8
in_addmulti(ccfe3bdc,c25d3000) at in_addmulti+0x69
in_ifinit(c25d3000,c27da500,c262dcd0,0,ccfe3c38) at in_ifinit+0x529
in_control(c28206f4,8040691a,c262dcc0,c25d3000,c27e7000) at in_control+0x882
ifioctl(c28206f4,8040691a,c262dcc0,c27e7000,0) at ifioctl+0x198
soo_ioctl(c2678c60,8040691a,c262dcc0,c2480780,c27e7000) at soo_ioctl+0x2db
ioctl(c27e7000,ccfe3d04,3,2,286) at ioctl+0x370
syscall(3b,3b,3b,8056080,80583c0) at syscall+0x22f
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (54, FreeBSD ELF32, ioctl), eip = 0x28131603, esp = 0xbfbfe59c, ebp
= 0xbfbfede8 ---
panic: trying to sleep while sleeping is prohibited
cpuid = 0
KDB: enter: panic
[thread pid 13 tid 100003 ]
Stopped at      kdb_enter+0x2b: nop

More information (bt, bt all, show alllocks) can be found at
http://www.pfsense.com/~sullrich/panics/usb_network_nic_panic.txt

Let me know if you need any more information.