Hi Jay, I saw these errors when I worked in the HPC sector. They come usually with a kernel dump for each core in the machine so you can know, after some peering at the kernel code, how the soft lockup triggers. When I did that it was always an issue with the memory.
So those times that you can still work on the machine after the problem, look at the kernel messages. I will be glad to look at it. On Wed, Feb 11, 2015 at 1:33 AM, Jay Rolette <rolette at infiniteio.com> wrote: > Environment: > * DPDK 1.6.0r2 > * Ubuntu 14.04 LTS > * kernel: 3.13.0-38-generic > > When we start exercising KNI a fair bit (transferring files across it, both > sending and receiving), I'm starting to see a fair bit of these kernel > lockups: > > kernel: BUG: soft lockup - CPU#1 stuck for 22s! [kni_single:1782] > > Frequently I can't do much other than get a screenshot of the error message > coming across the console session once we get into this state, so debugging > what is happening is "interesting"... > > I've seen this on multiple hardware platforms (so not box specific) as well > as virtual machines. > > Are there any known issues with KNI that would cause kernel lockups in DPDK > 1.6? Really hoping someone that knows KNI well can point me in the right > direction. > > KNI in the 1.8 tree is significantly different, so it didn't look > straight-forward to back-port it, although I do see a few changes that > might be relevant. > > Any suggestions, pointers or other general help for tracking this down? > > Thanks! > Jay >
