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Re: fs: GPF in locked_inode_to_wb_and_lock_list

From Andrey Ryabinin <ryabinin.a.a@gmail.com>
Newsgroups linux.kernel
Subject Re: fs: GPF in locked_inode_to_wb_and_lock_list
Date 2016-04-21 11:50 +0200
Message-ID <rqjph-74z-17@gated-at.bofh.it> (permalink)
References <rpdYC-3eO-15@gated-at.bofh.it> <rq7Ht-69I-5@gated-at.bofh.it> <rqijw-6dW-15@gated-at.bofh.it>
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2016-04-21 11:35 GMT+03:00 Dmitry Vyukov <dvyukov@google.com>:
>
> 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

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Thread

fs: GPF in locked_inode_to_wb_and_lock_list Dmitry Vyukov <dvyukov@google.com> - 2016-04-18 11:50 +0200
  Re: fs: GPF in locked_inode_to_wb_and_lock_list Tejun Heo <tj@kernel.org> - 2016-04-20 23:20 +0200
    Re: fs: GPF in locked_inode_to_wb_and_lock_list Dmitry Vyukov <dvyukov@google.com> - 2016-04-21 10:30 +0200
      Re: fs: GPF in locked_inode_to_wb_and_lock_list Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2016-04-21 11:20 +0200
        Re: fs: GPF in locked_inode_to_wb_and_lock_list Dmitry Vyukov <dvyukov@google.com> - 2016-04-21 11:30 +0200
      Re: fs: GPF in locked_inode_to_wb_and_lock_list Tejun Heo <tj@kernel.org> - 2016-04-21 18:20 +0200
    Re: fs: GPF in locked_inode_to_wb_and_lock_list Dmitry Vyukov <dvyukov@google.com> - 2016-04-21 10:40 +0200
      Re: fs: GPF in locked_inode_to_wb_and_lock_list Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2016-04-21 11:50 +0200
        Re: fs: GPF in locked_inode_to_wb_and_lock_list Dmitry Vyukov <dvyukov@google.com> - 2016-04-21 12:10 +0200
          Re: fs: GPF in locked_inode_to_wb_and_lock_list Tejun Heo <tj@kernel.org> - 2016-04-21 19:10 +0200
            Re: fs: GPF in locked_inode_to_wb_and_lock_list Dmitry Vyukov <dvyukov@google.com> - 2016-04-22 21:00 +0200

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