> On Mar 11, 2021, at 7:07 AM, [email protected] wrote:
>
> Quoth Shiro <[email protected]>:
>> Hello,
>>
>> I’m not sure I’m reporting to the appropriate place. Please advise. And
>> apologies in advance if I’m spamming this group.
>>
>
> This is fine, but [email protected] is probably
> better for 9front specific questions.
thx.
>
> As far as uploading information -- 9front ships
> with webpaste, so it's easy to get text uploaded,
> which would let people copy values.
Noted, I’ll use this next time.
>> Photo 3: acid is pointing to line 431. From above, n is too large
>> to be a strlen. I suspect it actually failed in memmove(), but
>> I’m not sure — I’ve only got 2 months on Plan9/9front and this is
>> the first time I do acid.
>
> Acid just shows whole words, so you're seeing 64
> bits of a 32 bit value. If you look closely,
> you'll actually notice that the top bits in 'n'
> are also the bottom bits of 'dat'
>
> It's a bit unfortunate, you either have to tell
> acid how to format the type, or you have to know
> that you just need to ignore the top bits.
OK, better than nothing. Hmm, maybe enhancing Acid to correctly format the
type would be a nice GSOC project?
>
> Anyawys, the faulting address is
>
> addr=0x100061fa0 pc=37930
>
> Which shows up in R4. Given that *almost* the same
> addresses (0x61fa0) in the other registers. It
> looks like it could be stack corruption.
>
> Is this easy to reproduce? Are you using the
> binary from the last release, or is it your own
> build?
Yes, this is very easy to reproduce. It happens immediately on the first “ls”.
I’m using the released bin image:
9front-8013.d9e940a768d1.pi3.img.gz
Steps to reproduce:
1: Create and export a dir on Linux. Add the dir to /etc/exports for NFSv3:
/srv/l9p
192.168.1.0/24(rw,insecure,sync,no_subtree_check,no_root_squash)
Then on Plan9:
2: start the NFS server:
nfs -p 775 -s i7 192.168.1.7
3: mount the NFS export:
mount -c /srv/i7 /n/i7 /srv/l9p
4: attempt to use it:
ls /n/i7
and the NFS server will crash on RPi3 and RPi4.
>
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