Messages in this thread | | | Subject | Re: "Failed to create /dev/root: -14" after commit e6978e4bf1 ("ARM: save and reset the address limit when entering an exception") | From | Guenter Roeck <> | Date | Wed, 3 Aug 2016 08:07:02 -0700 |
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On 08/03/2016 01:38 AM, Russell King - ARM Linux wrote: > On Tue, Aug 02, 2016 at 07:51:45PM -0700, Guenter Roeck wrote: >> Hi, >> >> I see the following crash when running a qemu arm 'kzm' runtime test with >> the current mainline. >> ... >> Failed to create /dev/root: -14 >> >> [ followed by panic ] >> >> A complete log file is at [1]. > > I think it's because of those undefined instructions you're hitting > with the hw-breakpoint code... can you try the patch below please? > > arch/arm/kernel/entry-armv.S | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S > index bc5f50799d75..9f157e7c51e7 100644 > --- a/arch/arm/kernel/entry-armv.S > +++ b/arch/arm/kernel/entry-armv.S > @@ -295,6 +295,7 @@ __und_svc_fault: > bl __und_fault > > __und_svc_finish: > + get_thread_info tsk > ldr r5, [sp, #S_PSR] @ Get SVC cpsr > svc_exit r5 @ return from exception > UNWIND(.fnend ) >
Yes, that fixes the problem.
Assuming you'll create a patch:
Tested-by: Guenter Roeck <linux@roeck-us.net>
Does that need to be addressed in qemu, or is it a Linux bug ?
Thanks, Guenter
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