Re: kernel panics at google

[Alan Cox]

> Update: We (Google) set /proc/sys/net/ipv4/tcp_retrans_collapse to "0"
> on our webservers.  Now, instead of a kernel panic, they seem to
> spontaneously reboot without any errors or explanation in
> /var/log/messages.  For us, this is a significant improvement over the

Ok that fits the original diagnosis that someone had passed a freed buffer
down that part of the network stack. The question remains who.

> Any suggestion on how we can collect more information about why the
> machines are rebooting?
 
Its probably going to be a case of adding printk and other traps to a box
if Dave doesn't do it I'll have a look at where to drop some diagnostics in