Re: Baseline JIT crash on arm64

On 05/13/2016 03:08 PM, 孙科 wrote:
> Hi, all
>      Since we modify the code, and successful compiled baseline JIT on
> arm64. We got 'illeagal instruction' crash when executing scripts.
>      Use gdb to debugging this problem, try 'j *$pc' command, the code can
> run normally several times. Like this problem, what may be relevant?
>       Here is the log:
>             (gdb) r
>
> js> for(var i=0; i<10000000; i++);
> Thread 1 "js" received signal SIGILL, Illegal instruction.
> 0x0000007fb7fd13d0 in ?? ()
> (gdb) info f
> Stack level 0, frame at 0x0:
>   pc = 0x7fb7fd13d0; saved pc = 0x7fb7bc6b50
>   Outermost frame: not enough registers or memory available to unwind further
>   Arglist at unknown address.
>   Locals at unknown address, Previous frame's sp is 0x0
> (gdb) j *$pc
> Continuing at 0x7fb7fd13d0.

This is weird, if this were an illegal instruction, this should not work, 
unless there is a bug in gdb, and the pc is already incremented.

Can you paste the content of the surrounding instructions, with the disas 
command?

Can you start the engine with --no-ion, and if you cannot reproduce it, with 
--ion-eager.

-- 
Nicolas B. Pierron
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