linux-kernel - Re: [PATCH] n_tty: use kmalloc() instead of vmalloc() to avoid crash on armada-xp

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Message-ID: <20150310173807.GU8656@n2100.arm.linux.org.uk>
Date:	Tue, 10 Mar 2015 17:38:08 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stas Sergeev <stsp@...t.ru>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] n_tty: use kmalloc() instead of vmalloc() to avoid crash
 on armada-xp

On Tue, Mar 10, 2015 at 08:27:34PM +0300, Stas Sergeev wrote:
> Please also find the same crash here:
> http://lists.linaro.org/pipermail/kernel-build-reports/2014-June/003872.html

Hmm, looks like from the exynos5420-arndale-octa failure in that, we
don't dump the page table entries.  We should do.  Sorry about my
previous mail.

If you can reproduce this, please do so with this patch so that we
can get the page table entries associated with the problem.  Thanks.

 arch/arm/mm/fault.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index a982dc3190df..6333d9c17875 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -552,6 +552,7 @@ do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 
 	pr_alert("Unhandled fault: %s (0x%03x) at 0x%08lx\n",
 		inf->name, fsr, addr);
+	show_pte(current->mm, addr);
 
 	info.si_signo = inf->sig;
 	info.si_errno = 0;


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