> On Oct 30, 2018, at 18:10, ? ? <mr.liux...@outlook.com> wrote:
>
> Hello:
> Recently, we have encountered a kernel dead question, and the reason
> we analyses vmcore dmesg is that list_add_tail(&cap->session_caps) in
> __ceph_remove_cap has wrong,since &cap->session_cap is NULL!
> so we analyses codes with cap->session_caps operaions,
> We found these two functions involving cap - > session_cap operations, but
> there is no lock protection.
> (1) cleanup_cap_releases
> (2) ceph_send_cap_releases
> SO, we want to ask you,whether there is a cap > session_caps operation
> exception in multithreading without locking or is it right code to operate
> cap->session_caps in these two functions without lock protection? and why if
> right?
There are protected by s_cap_lock. Which version of kernel do you use?
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