lkml.org 
[lkml]   [2013]   [May]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Date
    SubjectRE: A bug about system call on ARM
    Hi  Will,

    Have you received the log files?

    And is there someone looking at this issue now ?
    This issue happened on Qcom Scorpoin CPUs,
    And it just happened in our stability test occasionally .

    If you have some patch for this issue,
    I can do the test for it .

    Thanks for your help very much !

    -----Original Message-----
    From: Wang, Yalin
    Sent: Wednesday, May 29, 2013 5:51 PM
    To: 'Will Deacon'; richard -rw- weinberger
    Cc: linux-arch@vger.kernel.org; linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org
    Subject: RE: A bug about system call on ARM

    Hi

    This is kernel.log and the stack which is recovered by Trace32 tools.
    Please have a look at it .

    Thanks

    -----Original Message-----
    From: Will Deacon [mailto:will.deacon@arm.com]
    Sent: Wednesday, May 29, 2013 5:48 PM
    To: richard -rw- weinberger
    Cc: Wang, Yalin; linux-arch@vger.kernel.org; linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org
    Subject: Re: A bug about system call on ARM

    Hello,

    On Wed, May 29, 2013 at 09:46:42AM +0100, richard -rw- weinberger wrote:
    > On Wed, May 29, 2013 at 10:24 AM, Wang, Yalin <Yalin.Wang@sonymobile.com> wrote:
    > > I have download the latest linux kernel code 3.9.4 And Compare with
    > > 3.4.0 kernel .
    > >
    > > It seems there is no change for this part , So it will still happen
    > > .
    > > Does anyone know who is responsible for arm arch part kernel code ?
    >
    > See MAINTAINERS file.
    > CC'ing linux-arm-kernel@lists.infradead.org

    Cheers for adding us to CC.

    > >> #ifdef CONFIG_ARM_THUMB
    > >> tst r8, #PSR_T_BIT
    > >> movne r10, #0 @ no thumb OABI emulation
    > >> ldreq r10, [lr, #-4] @ get SWI instruction // crash at this instruction, when get SWI instruction

    Do you have the panic log please? Also, which SoC are you using and how are you reproducing this?

    > >> ldr r10, [lr, #-4] @ get SWI instruction
    > >> A710( and ip, r10, #0x0f000000 @ check for SWI )
    > >> A710( teq ip, #0x0f000000 )
    > >> A710( bne .Larm710bug )
    > >> #endif
    > >> #ifdef CONFIG_CPU_ENDIAN_BE8
    > >> rev r10, r10 @ little endian instruction
    > >> #endif
    > >>
    > >> /******************************************************************
    > >> ***
    > >> ******************************/
    > >>
    > >> Then reason why it will crash when get SWI instruction is maybe
    > >> This page is clear to aged by kernel, But this MMU fault happpened
    > >> in kernel, So the kernel do_page_fault function will not clear this
    > >> page to young, So that will crash .

    Sounds like we might need some USER annotations around the instruction loads, but we should also rework the code so that we re-enable interrupts first.

    Will


    \
     
     \ /
      Last update: 2013-05-30 04:01    [W:3.749 / U:0.016 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site