Comment 143 for bug 1505564

This problem has caused more serious damage recently. When nbd dies and printk()s like mad, the serial console is not fast enough to display it.

The kernel keeps allocating buffer space for serial output, which we see as 13G kmalloc-256 or kmalloc-512 kernel threads.

Eventually the OOMkiller tries to free up space, but it can only kill userspace programs so ultimately the system dies altogether.

This is more dire than mere CPU load or lockup warning messages.