Lukas Ertl wrote this message on Sun, Jul 27, 2003 at 16:43 +0200:
On Sun, 27 Jul 2003, Mark Blackman wrote:
Perhaps it's a USB bug. There seems to be some correspondence between the use of the USB Speedtouch ADSL modem and the out-of-control devbuf allocations.
I'm too seeing these annoying kmem_malloc panics on recent -current kernels. The laptop I'm using is way off of being overloaded at all, the only thing I do is going online using a Bluetooth USB dongle. As soon as I generate some network traffic, devbuf allocations go up, until at some point the machine panics randomly in kmem_malloc.
I must note that the USB changes only allocates memory in the M_USB area which is described by: usb.c:MALLOC_DEFINE(M_USB, "USB", "USB");
So, that means it wouldn't be in the devbuf area. (This is the one of the points of malloc areas is to help track down stray allocations and memory leaks).
I have different core dumps and backtraces available, but they don't seem to be of much use in this case. I really suspect the USB stuff to be leaking.
It may be leaking, but it won't be leaking devbuf memory. The only thing that is in usb (in dev/usb) that uses M_DEVBUF is ukbd.
bus_dma_tag_create() allocates out of M_DEVBUF. Could it be that tags are being created and never destroyed?
Scott
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