Re: [syzbot] [rdma?] INFO: trying to register non-static key in skb_dequeue (2)

[Zhu Yanjun]

On Tue, May 23, 2023 at 12:10 PM Guoqing Jiang <guoqing.jiang@xxxxxxxxx> wrote:
>
>
>
> On 5/23/23 12:02, Zhu Yanjun wrote:
> > On Tue, May 23, 2023 at 11:47 AM Zhu Yanjun <zyjzyj2000@xxxxxxxxx> wrote:
> >> On Tue, May 23, 2023 at 10:26 AM Guoqing Jiang <guoqing.jiang@xxxxxxxxx> wrote:
> >>>
> >>>
> >>> On 5/23/23 10:13, syzbot wrote:
> >>>> Hello,
> >>>>
> >>>> syzbot tried to test the proposed patch but the build/boot failed:
> >>>>
> >>>> failed to apply patch:
> >>>> checking file drivers/infiniband/sw/rxe/rxe_qp.c
> >>>> patch: **** unexpected end of file in patch
> >> This is not the root cause. The fix is not good.
> > This problem is about "INFO: trying to register non-static key. The
> > code is fine but needs lockdep annotation, or maybe"

This warning is from "lock is not initialized". This is a
use-before-initialized problem.
The correct fix is to initialize the lock that is complained before it is used.

Zhu Yanjun
>
> Which is caused by  "skb_queue_head_init(&qp->resp_pkts)" is not called
> given rxe_qp_init_resp returns error, but the cleanup still trigger the
> chain.
>
> rxe_qp_do_cleanup -> rxe_completer -> drain_resp_pkts ->
> skb_dequeue(&qp->resp_pkts)
>
> But I might misunderstood it ...
>
> Thanks,
> Guoqing