Unwinding stop on irq handler or across it?

[Johannes Stoelp]

Hi all,

> Hi,
> When use GDB debug Linux kernel, GDB can't stop on unwinding from an irq handler,

> #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 ....

> This problem can be fixed by either adding .cfi directives in entry.S or adding some Linux awareness into GDB.  I want to know what is the expected behavior?  Is it reasonable that stack unwinding stops on irq handler, like el1_irq in this case? or something else?

> Yao (齐尧)

I'm really interested in finding a solution to this issue, do you have any comments on Yao's mail?

Best,
Johannes