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Date:   Sun, 26 Apr 2020 14:53:42 -0700
From:   Eric Dumazet <>
To:     "Jason A. Donenfeld" <>,
        Eric Dumazet <>
Cc:     syzbot <>,
        David Miller <>,
        Florian Fainelli <>,
        Greg Kroah-Hartman <>,,
        Jiří Pírko <>,
        Krzysztof Kozlowski <>,,,,
        LKML <>,, Netdev <>,
        Shuah Khan <>,,
        Thomas Gleixner <>,,
        Cong Wang <>
Subject: Re: INFO: rcu detected stall in wg_packet_tx_worker

On 4/26/20 1:46 PM, Jason A. Donenfeld wrote:

> Ah, whew, okay. I had just begun instrumenting sfq (the highly
> technical term for "adding printks everywhere") to figure out what's
> going on. Looks like you've got a handle on it, so I'll let you have
> at it.

Yes, syzbot manages to put a zero in q->scaled_quantum

I will send a fix.

> On the brighter side, it seems like Dmitry's and my effort to get full
> coverage of WireGuard has paid off in the sense that tons of packets
> wind up being shoveled through it in one way or another, which is
> good.

Sure !

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