lkml.org 
[lkml]   [2017]   [Oct]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: ARM64: Regression with commit e3067861ba66 ("arm64: add basic VMAP_STACK support")
On Tue, Oct 10, 2017 at 05:03:44PM +0100, Robin Murphy wrote:
> On 10/10/17 16:45, Mark Rutland wrote:
> > On Tue, Oct 10, 2017 at 10:27:25PM +0800, Leo Yan wrote:
> >> Hi Mark,
> >
> > Hi Leo,
> >
> >> I work mainline kernel on Hikey620 board, I find it's easily to
> >> introduce the panic and report the log as below. So I bisect the kernel
> >> and finally narrow down the commit e3067861ba66 ("arm64: add basic
> >> VMAP_STACK support") which introduce this issue.
> >>
> >> I tried to remove 'select HAVE_ARCH_VMAP_STACK' from
> >> arch/arm64/Kconfig, then I can see the panic issue will dismiss. So
> >> could you check this and have insight for this issue?
> >
> > Given the stuff in the backtrace, my suspicion is something is trying to
> > perform DMA to/from the stack, getting junk addresses form the attempted
> > virt<->phys conversions.
> >
> > Could you try enabling both VMAP_STACK and CONFIG_DEBUG_VIRTUAL?
>
> CONFIG_DMA_API_DEBUG should scream about drivers trying to use stack
> addresses either way, too.

Thanks for suggestions, Mark & Robin.

I enabled these debugging configs but cannot get clue from it; but
occasionally found this issue is quite likely related with CA53 errata,
especialy ERRATA_A53_855873 is the relative one. So I changed to use
ARM-TF mainline code with ERRATA fixing, this issue can be dismissed.

Please ignore this regression reporting.

Thanks,
Leo Yan

\
 
 \ /
  Last update: 2017-10-16 03:18    [W:0.171 / U:0.356 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site