[lustre-devel] Current results and status of my upstream work

[NeilBrown <neilb@suse.com>]

On Fri, Mar 30 2018, James Simmons wrote:

>
> To let you know test 154 always triggers a LBUG due to splice changes that
> landed. I'm seeing
>
> 2018-03-30 13:41:37 [ 6351.749923] BUG: unable to handle kernel paging 
> request at ffffffffffffffbc
> 2018-03-30 13:41:37 [ 6351.757031] IP: ll_splice_alias+0x1df/0x250 
> [lustre]

Can you run
  ./scripts/faddr2line drivers/staging/lustre/lustre/llite/namei.o  ll_splice_alias+0x1df/0x250 

(you might need a different pathname for namei.o, depending on how you
build the kernel).

d_splice_alias() can return an error (very rarely I think) and the
CDEBUG() at the end of ll_splice_alias wouldn't be happy about that.

The code shows a crash at:
  2b:*	48 8b 48 30          	mov    0x30(%rax),%rcx		<-- trapping instruction

and 
   RAX: ffffffffffffff8c

which is -116 or -ESTALE.
That is an error which d_splice_alias() can get from __d_unalias, so
I guess that is what is happening.

I'll dig through d_splice_alias() and try to work out what that means.

Thanks,
NeilBrown
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