[PATCH v2] RDMA/cma: prevent rdma id destroy during cma_iw_handler

[Yi Zhang]

On Fri, Sep 8, 2023 at 3:18 PM Hannes Reinecke <hare at suse.de> wrote:
>
> On 9/7/23 09:47, Yi Zhang wrote:
> > Seems I reproduced this issue[3] when I run [1] on the latest
> > linux-block/for-next with kernel config[2].
> >
> > [1]nvme_trtype=rdma ./check nvme/
> >
> > [2] https://pastebin.com/u9fh7dbX
> >
> But isn't this the same issue as the circular locking discussed earlier?

Sorry, maybe I mixed up the issues here, There are three issues here:

1. "BUG:KASAN: slab-use-after-free at mutex_lock() in
cma_iw_handler()." which Shin'ichiro mentioned in this patch and
triggered by nvme/rdma nvme/030 nvme/031 use siw

2. nvme/tcp circular locking on install_queue which could be fixed by:
https://lore.kernel.org/linux-nvme/20230810132006.129365-1-hare@suse.de/
https://lore.kernel.org/linux-nvme/20230726142939.10062-1-guoqing.jiang@linux.dev/

3. circular locking at rdma_destroy_id+0x17/0x20 [rdma_cm] which was
already filed last year but still not get one solution:
https://lore.kernel.org/linux-rdma/CAHj4cs93BfTRgWF6PbuZcfq6AARHgYC2g=RQ-7Jgcf1-6h+2SQ@mail.gmail.com/


>
> Can you check if the patch
> 'nvmet-tcp: avoid circular locking dependency on install_queue()'
> fixes this issue, too?
>
> Cheers,
>
> Hannes
> --
> Dr. Hannes Reinecke                Kernel Storage Architect
> hare at suse.de                              +49 911 74053 688
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--
Best Regards,
  Yi Zhang