data abort when run 'dhcp'

[Miquel Raynal]

Hi Tom,

trini at konsulko.com wrote on Thu, 20 Jul 2023 14:34:52 -0400:

> On Thu, Jul 20, 2023 at 06:39:17PM +0200, Miquel Raynal wrote:
> > Hello,
> > 
> > qianfanguijin at 163.com wrote on Fri, 25 Mar 2022 18:04:46 +0800:
> >   
> > > It's very strange. And I can't detect it's a bug of usb or dlmalloc.
> > > 
> > > 1. Starting u-boot and dhcp via am335x's ethernet(cpsw driver), it's ok.
> > > 
> > > 2. Starting u-boot and dhcp via am335x's usb net, data abort.
> > > 
> > > 3. start fastboot, and CTRL C right now, dhcp via am335x's usb net, it's ok.  
> > 
> > I am sorry to re-open a thread that is one year old but this is
> > still an open bug. The BBB is affected. In particular the BBBW
> > because there is no Ethernet connector, which makes the Eth-over-USB
> > emulation even more important. All U-Boots since 2021 are affected:
> > spurious data aborts, usually at the end of network interactions (tftp,
> > ping). I could not bisect it because the boot was deeply broken as
> > well on a significant range of commits :-/.
> > 
> > On my side I narrowed it down to an env update which fails in malloc as
> > well. If I comment the env update, it fails a bit later. It really
> > looks like a stack corruption which is either related to the Ethernet
> > USB gadget or the USB controller driver itself. Network transfers on
> > the BBBW using regular Ethernet does not trigger any error.
> > 
> > I also observe the very strange "fix" mentioned above: starting and
> > killing fastboot makes all tftp pass... If anyone has more details to
> > share, or perhaps a subsequent thread giving more details, I would
> > really like to see this fixed upstream, I suppose I am not the only one
> > :-)  
> 
> What happens if you increase the malloc pool from say 32MB (current
> value, 0x2000000) to 64MB (so 0x4000000) ?

Same result. I tried to increment the heap size to 64MB as well as the
stack size (16 -> 64MB), same behavior.

Thanks,
Miquèl