linux-kernel - Re: [syzbot] [rdma?] INFO: trying to register non-static key in skb

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Message-ID: <CAD=hENcqa0jQvLjuXw9bMtivCkKpQ9=1e0-y-1oxL23OLjutuw@mail.gmail.com>
Date:   Tue, 23 May 2023 12:29:33 +0800
From:   Zhu Yanjun <zyjzyj2000@...il.com>
To:     Guoqing Jiang <guoqing.jiang@...ux.dev>
Cc:     syzbot <syzbot+eba589d8f49c73d356da@...kaller.appspotmail.com>,
        jgg@...pe.ca, leon@...nel.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [rdma?] INFO: trying to register non-static key in
 skb_dequeue (2)

On Tue, May 23, 2023 at 12:10 PM Guoqing Jiang <guoqing.jiang@...ux.dev> wrote:
>
>
>
> On 5/23/23 12:02, Zhu Yanjun wrote:
> > On Tue, May 23, 2023 at 11:47 AM Zhu Yanjun <zyjzyj2000@...il.com> wrote:
> >> On Tue, May 23, 2023 at 10:26 AM Guoqing Jiang <guoqing.jiang@...ux.dev> 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