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Date:   Sat, 23 May 2020 09:28:43 +0900
From:   Tetsuo Handa <>
To:     Eric Dumazet <>, Jon Maloy <>
Cc:     Eric Dumazet <>,
        Xin Long <>,
        "David S . Miller" <>,
        netdev <>,
        syzbot <>,
Subject: Re: [PATCH net] tipc: block BH before using dst_cache

On Fri, May 22, 2020 at 2:30 AM Eric Dumazet <> wrote:
> dst_cache_get() documents it must be used with BH disabled.

Since the report was complaining about preemption at this_cpu_ptr(), and "#syz test"
request with my preemption-disable patch no longer complained, I didn't realize that
it is documented in dst_cache.h that dst_cache_get() must be called with BH disabled.
It is bug-prone that we don't have a check for complaining that BH is not disabled.

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