Messages in this thread | | | Subject | Re: Kernel Panic in skb_release_data using genet | From | Florian Fainelli <> | Date | Fri, 28 May 2021 09:21:27 -0700 |
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On 5/24/21 8:37 AM, Florian Fainelli wrote: > > > On 5/24/2021 8:13 AM, Maxime Ripard wrote: >> Hi Florian, >> >> On Mon, May 24, 2021 at 07:49:25AM -0700, Florian Fainelli wrote: >>> Hi Maxime, >>> >>> On 5/24/2021 6:01 AM, Maxime Ripard wrote: >>>> Hi Doug, Florian, >>>> >>>> I've been running a RaspberryPi4 with a mainline kernel for a while, >>>> booting from NFS. Every once in a while (I'd say ~20-30% of all boots), >>>> I'm getting a kernel panic around the time init is started. >>>> >>>> I was debugging a kernel based on drm-misc-next-2021-05-17 today with >>>> KASAN enabled and got this, which looks related: >>> >>> Is there a known good version that could be used for bisection or you >>> just started to do this test and you have no reference point? >> >> I've had this issue for over a year and never (I think?) got a good >> version, so while it might be a regression, it's not a recent one. > > OK, this helps and does not really help. > >> >>> How stable in terms of clocking is the configuration that you are using? >>> I could try to fire up a similar test on a Pi4 at home, or use one of >>> our 72112 systems which is the closest we have to a Pi4 and see if that >>> happens there as well. >> >> I'm not really sure about the clocking. Is there any clock you want to >> look at in particular? > > ARM, DDR, AXI, anything that could cause some memory corruption to occur > essentially. GENET clocks are fairly fixed, you have a 250MHz clock and > a 125MHz clock feeding the data path. > >> >> My setup is fairly simple: the firmware and kernel are loaded over TFTP >> and the rootfs is mounted over NFS, and the crash always occur around >> init start, so I guess when it actually starts to transmit a decent >> amount of data? > > Do you reproduce this problem with KASAN disabled, do you eventually > have a crash pointing back to the same location? > > I have a suspicion that this is all Pi4 specific because we regularly > run the GENET driver through various kernel versions (4.9, 5.4 and 5.10 > and mainline) and did not run into that.
I have not had time to get a set-up to reproduce what you are seeing, could you share your .config meanwhile? Thanks -- Florian
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