https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238095
--- Comment #13 from Hans Petter Selasky <hsela...@freebsd.org> ---
Last time I was debugging something in this area, I found that the UART
registers, which appear emulated, have some races. For example if I was reading
the UART registers right before posting a doorbell on the mlx4en driver, the
hypervisor would reboot the image :-(
+ if (mlx4_crash != 0) {
+ while (1) {
+ inb(0x3f8+5);
+ }
+ }
+ __raw_writel((__force u32)val,
+ &priv->mfunc.comm->slave_write);
I was not able to get to the bottom of this due to lack of interest from the
hypervisor developers.
This race happens only with N number of CPUs.
You may play around with inb() in the network driver code and see if you can
provoke a similar action.
--HPS
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