Apparently there are at least two interrupt race conditions between the sl(4) driver and the generic network code.
This crash was observed on an i386 running a GENERIC 4.9 kernel: http://www.durlej.net/sl-crash-out And the following one is from a custom 4.9 kernel. I hope it is still useful: http://www.durlej.net/sl-crash-in Running a ping(8) flood through a router with a sl interface seems to be sufficient to reproduce the crash. The cause seems to be the sl(4) code being called from an interrupt at a spl(9) that is too high. Thanks, Piotr
