Re: 2.6.23-rc1: BUG_ON in kmap_atomic_prot()

On Tue, 24 Jul 2007 01:01:53 +0400
Alexey Dobriyan [off-list ref] wrote:

On Tue, Jul 24, 2007 at 12:40:45AM +0400, Alexey Dobriyan wrote:

quoted

quoted

I had more complete info: http://article.gmane.org/gmane.linux.network/66966

You're using DEBUG_PAGEALLOC, but I was not, so I think we can rule that out.

I haven't worked out where that kmap_atomic() call is coming from yet. 
Both traces point up into the page allocator, but I _think_ that's stack
gunk.

Ahh, you suspect networking.

Here, setup is 2 cheap-ass 100Mb realtek 8139 NICs, one to campus network
receiving ~20 junk packets per second, one gathering netconsole output
and ssh to it, no conntracks and fancy stuff.

[reboots with cables physically unplugged]

OK, I run gdb recompile, cat(1) every file in /usr/portage (shitload of
small files) with both cables unplugged. It all went fine for ~5 minutes
after that it crashed exactly same way after 10 secs after plugging one
of them.

It'd be nice to get a clean trace.  Are you able to obtain the full
trace with CONFIG_FRAME_POINTER=y?