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RE: Infinite Stack Unwinding ARM

From: Johannes Stoelp <Johannes dot Stoelp at synopsys dot com>
To: Yao Qi <qiyaoltc at gmail dot com>, Johannes Stoelp <Johannes dot Stoelp at synopsys dot com>
Cc: "gdb at sourceware dot org" <gdb at sourceware dot org>, Andreas Ropers <Andreas dot Ropers at synopsys dot com>, Marc Mones <Marc dot Mones at synopsys dot com>, "Kai Schuetz" <Kai dot Schuetz at synopsys dot com>, Johannes Stoelp <Johannes dot Stoelp at synopsys dot com>
Date: Tue, 11 Apr 2017 16:20:06 +0000
Subject: RE: Infinite Stack Unwinding ARM
Authentication-results: sourceware.org; auth=none
References: <6ECCE8A0904A1643BE093611EF2098CE0147553E@DE02WEMBXB.internal.synopsys.com> <86pogrp0vj.fsf@gmail.com> <6ECCE8A0904A1643BE093611EF2098CE01475738@DE02WEMBXB.internal.synopsys.com> <8660iclbdo.fsf@gmail.com>

Hi Yao,

Yao Qi <qiyaoltc@gmail.com> writes:
> We may end up with having some Linux kernel specific stuff, and this should fall in "Linux kernel debugging for aarch64".  

I see, thanks for the hint.

> Can you post me the backtrace, as a sample output?

When having unlimited backtrace enabled (default), I get backtraces like the following:
#0  gic_handle_irq (regs=0xffffffc07d9c7e30) at drivers/irqchip/irq-gic.c:263
#1  0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#2  0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#3  0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#4  0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#5  0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#6  0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#7  0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
...
#20009 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#20010 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#20011 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#20012 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#20013 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#20014 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
...

Best,
Johannes

References:
- Infinite Stack Unwinding ARM
  - From: Johannes Stoelp
- Re: Infinite Stack Unwinding ARM
  - From: Yao Qi
- RE: Infinite Stack Unwinding ARM
  - From: Johannes Stoelp
- Re: Infinite Stack Unwinding ARM
  - From: Yao Qi

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