[Arm-dev] Chrooting/Docker to armv7hl and armv5tel on aarch64
gordan at redsleeve.org
Sat Jan 26 20:08:10 UTC 2019
I did a bit more digging, and rebuilding 4.9.153 with CONFIG_COMPAT and a
few related options, had an effect - no longer do I get "exec format error"
- now it just outright segfaults.
4.4.172 works perfectly.
I'm using clean mainline kernels with no additional patches.
chrooting to aarch64 chroots works.
On Sat, Jan 26, 2019 at 6:07 PM Stephen John Smoogen <smooge at gmail.com>
> On Sat, 26 Jan 2019 at 18:45, Gordan Bobic <gordan at redsleeve.org> wrote:
>> Yes, they are "wrong", but not "WRONG!".
>> As I (possibly poorly) explained, I'm running on an aarch64 machine, but
>> am trying to run armv5tel and armv7hl chroots.
>> I just dug out an old kernel I was using (4.4.72) and I can now chroot
>> just fine.
>> So it's something that changed in the kernel, but I'm not sure what else
>> it could be other than the page size (which I already checked).
>> I'm going to build the latest 4.4.172 with my 4.4.72 config and see if
>> that works. If it does, I'll try to make oldconfig that on 4.9.153 and try
>> again, see if that breaks things again. I was just hoping there might be an
>> option I missed in 4.9 that enables/disables downward compatibility.
> The places I have seen where this breaks before was
> * it works on only specific aarch64 devices
> * it works but only after you update the firmware to a newer vendor
> version (because the kernel expects that to fix something else)
> * it is a regression and needs to be fixed.
> [The first one was where someone remembered it working but forgot they
> were working on XYZ box and then replicated in ABC and found the arch
> didn't have that.]
> I am expecting it is going to be 3... but I would check on 2 also.
>> On Sat, Jan 26, 2019 at 5:41 PM Stephan GUILLOUX <
>> stephan.guilloux at free.fr> wrote:
>>> Wrong architecture binaries, in the chroot'ed folder ?
>>> What do you get with:
>>> file <chroot>/bin/bash
>>> On 26-Jan-19 17:49, Gordan Bobic wrote:
>>> > It's been so long since I last had to do this, that it looks like a
>>> > kernel update somewhere along the way broke this for me. :-(
>>> > What happens now:
>>> > # chroot rs7
>>> > chroot: failed to run command ‘/bin/bash’: Exec format error
>>> > I could have sworn that this was all I needed to make this work last
>>> > # grep 4K_PAGES config-4.9.153-1.el7.centos.aarch64
>>> > CONFIG_ARM64_4K_PAGES=y
>>> > # CONFIG_ARM64_64K_PAGES is not set
>>> > Unfortunately, now trying to chroot into either hard-float or
>>> > soft-float chroot results in the exec format error.
>>> > Looking at time stamps of various things, I had this working with
>>> > 4.4.70, but have since switched to 4.9.x kernels. Any thoughts on what
>>> > changed between 4.4 and 4.9 would be most appreciated.
>>> > What am I missing?
>>> > _______________________________________________
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>>> > Arm-dev at centos.org
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> Stephen J Smoogen.
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