Re: fs: GPF in locked_inode_to_wb_and_lock_list

[Andrey Ryabinin]

2016-04-21 11:35 GMT+03:00 Dmitry Vyukov <dvyukov@xxxxxxxxxx>:
>
> ffffffff818884dd:       48 8b 03                mov    (%rbx),%rax
>
> So whatever load "&wb->bdi->wb" produces is a NULL deref. (is it wb
> that is NULL?)

Yes it's NULL wb, because there is only one load:
    mov    (%rbx),%rax        =>       rax = wb->bdi
    add    $0x50,%rax         =>       rax = &bdi->wb