On Thu, Aug 16, 2018 at 11:58 PM, Russell King - ARM Linux <li...@armlinux.org.uk> wrote: > On Thu, Aug 16, 2018 at 10:35:16PM +0200, Marc Haber wrote: >> On Mon, Jun 25, 2018 at 05:41:27PM +0100, Peter Robinson wrote: >> > So with that and the other fix there was no improvement, with those >> > and the BPF JIT disabled it works, I'm not sure if the two patches >> > have any effect with the JIT disabled though. >> >> I can confirm the crash with the released 4.18.1 on Banana Pi, and I can >> also confirm that disabling BPF JIT makes the Banana Pi work again., > > Hi, > > I'm afraid that the information in the crash dumps is insufficient > to be able to work very much out about these crashes. > > We need a recipe (kernel configuration and what userspace is doing) > so that it's possible to recreate the crash, or we need responses > to requests for information - I requested the disassembly of > sk_filter_trim_cap and the BPF code dump via setting a sysctl back > in early July. Without this, as I say, I don't see how this problem > can be progressed.
I can provide a kernel config [1] but I've not had enough time to sit down and get the rest of the stuff and debug it due to a combination of travel and other priorities. > If the problem is at boot, one way to set the sysctl would be to > hack the kernel and explicitly initialise the sysctl to '2', or > boot with init=/bin/sh, then manually mount /proc, set the sysctl, > and then "exec /sbin/init" from that shell. (Remember there's no > job control in that shell, so ^z, ^c, etc do not work.) It starts to happen in the early kernel boot long before we get to any userspace across a number of ARMv7 devices (RPi2/3, BeagleBone and AllWinner H3 based devices at least). [1] https://pbrobinson.fedorapeople.org/kernel-armv7hl.config
