linux-kernel - Re: [PATCH] dmaengine: tegra: crash fix observed during dma client(UART) stress testing

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Tue, 3 May 2016 17:17:40 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Shardar Mohammed <smohammed@...dia.com>
Cc:	Jonathan Hunter <jonathanh@...dia.com>,
	Laxman Dewangan <ldewangan@...dia.com>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"gnurou@...il.com" <gnurou@...il.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dmaengine: tegra: crash fix observed during dma
 client(UART) stress testing

On Tue, May 03, 2016 at 02:44:49PM +0000, Shardar Mohammed wrote:
> Thanks for review. Please find my comments inline.
> 
> > On 03/05/16 13:14, Shardar Shariff Md wrote:
> > > During DMA client(UART) stress testing, observed below crash:
> > >
> > > [  167.041591] Unable to handle kernel paging request at virtual
> > > address 00100108 [  167.048818] pgd = ffffffc0de7ee000 [  167.052222]
> > > [00100108] *pgd=0000000000000000 [  167.056513] Internal error: Oops:
> > > 96000045 [#1] PREEMPT SMP [  167.084048] Modules linked in:
> > > [  167.087126] CPU: 0 PID: 1786 Comm: uarttest Tainted: G        W    3.10.33-
> > gb76f6f9 #5
> > > [  167.095040] task: ffffffc0a5ba6ac0 ti: ffffffc094380000 task.ti:
> > > ffffffc094380000 [  167.102529] PC is at tegra_dma_tasklet+0x50/0xf4 [
> > > 167.107148] LR is at tegra_dma_tasklet+0xc0/0xf4 [  167.111767] pc :
> > > [<ffffffc00044acc8>] lr : [<ffffffc00044ad38>] pstate: 800001c5 [
> > > 167.119155] sp : ffffffc094383a60 [  167.122469] x29: ffffffc094383a60
> > > x28: 0000000000000000
> > 
> > This appears to be from quite an old kernel. I assume that this is still valid for
> > the latest mainline?
> [Shardar] Yes.

Please get into the habit of testing your patches against upstream
kernels. Merely testing that it applies is not enough.

All patches that are submitted for mainline inclusion must be *runtime*
tested against a mainline kernel.

Also it would be nice if you could offer steps on how to reproduce, that
way we can extend our testing to make sure we never regress.

Thierry

Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)