On 07/20/2015 02:47 PM, Frank Schreuder wrote: > > On 7/18/2015 05:32 PM, Nikolay Aleksandrov wrote: >> On 07/18/2015 05:28 PM, Johan Schuijt wrote: >>> Thx for your looking into this! >>> >>>> Thank you for the report, I will try to reproduce this locally >>>> Could you please post the full crash log ? >>> Of course, please see attached file. >>> >>>> Also could you test >>>> with a clean current kernel from Linus' tree or Dave's -net ? >>> Will do. >>> >>>> These are available at: >>>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git >>>> git://git.kernel.org/pub/scm/linux/kernel/git/davem/net >>>> respectively. >>>> >>>> One last question how many IRQs do you pin i.e. how many cores >>>> do you actively use for receive ? >>> This varies a bit across our systems, but we’ve managed to reproduce this >>> with IRQs pinned on as many as 2,4,8 or 20 cores. >>> >>> I won’t have access to our test-setup till Monday again, so I’ll be testing >>> 3 scenario’s then: >>> - Your patch >> ----- >>> - Linux tree >>> - Dave’s -net tree >> Just one of these two would be enough. I couldn't reproduce it here but >> I don't have as many machines to test right now and had to improvise with >> VMs. :-) >> >>> I’ll make sure to keep you posted on all the results then. We have a kernel >>> dump of the panic, so if you need me to extract any data from there just >>> let me know! (Some instructions might be needed) >>> >>> - Johan >>> >> Great, thank you! >> > I'm able to reproduce this panic on the following kernel builds: > - 3.18.7 > - 3.18.18 > - 3.18.18 + patch from Nikolay Aleksandrov > - 4.1.0 > > Would you happen to have any more suggestions we can try? > > Thanks, > Frank >
Unfortunately I was wrong about my theory because I mixed qp and qp_in, the new frag doesn't make the chainlist if that codepath is hit so it couldn't mix the flags. I'm still trying (unsuccessfully) to reproduce this, I've tried with up to 4 cores and 4 different pinned irqs but no luck so far. Anyway, I'll keep looking into this and will let you know if I get anywhere. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
